root / lib / backend.py @ f6bd6e98
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# Copyright (C) 2006, 2007 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Functions used by the node daemon"""
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import os |
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import os.path |
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import shutil |
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import time |
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import stat |
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import errno |
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import re |
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import subprocess |
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import random |
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import logging |
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import tempfile |
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from ganeti import errors |
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from ganeti import utils |
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from ganeti import ssh |
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from ganeti import hypervisor |
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from ganeti import constants |
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from ganeti import bdev |
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from ganeti import objects |
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from ganeti import ssconf |
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def _GetSshRunner(): |
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return ssh.SshRunner()
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def _CleanDirectory(path, exclude=[]): |
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"""Removes all regular files in a directory.
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@param exclude: List of files to be excluded.
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@type exclude: list
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"""
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if not os.path.isdir(path): |
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return
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# Normalize excluded paths
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exclude = [os.path.normpath(i) for i in exclude] |
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for rel_name in utils.ListVisibleFiles(path): |
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full_name = os.path.normpath(os.path.join(path, rel_name)) |
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if full_name in exclude: |
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continue
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if os.path.isfile(full_name) and not os.path.islink(full_name): |
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utils.RemoveFile(full_name) |
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def JobQueuePurge(): |
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"""Removes job queue files and archived jobs
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"""
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_CleanDirectory(constants.QUEUE_DIR, exclude=[constants.JOB_QUEUE_LOCK_FILE]) |
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_CleanDirectory(constants.JOB_QUEUE_ARCHIVE_DIR) |
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def GetMasterInfo(): |
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"""Returns master information.
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This is an utility function to compute master information, either
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for consumption here or from the node daemon.
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@rtype: tuple
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@return: (master_netdev, master_ip, master_name)
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"""
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try:
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ss = ssconf.SimpleStore() |
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master_netdev = ss.GetMasterNetdev() |
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master_ip = ss.GetMasterIP() |
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master_node = ss.GetMasterNode() |
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except errors.ConfigurationError, err:
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logging.exception("Cluster configuration incomplete")
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return (None, None) |
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return (master_netdev, master_ip, master_node)
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def StartMaster(start_daemons): |
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"""Activate local node as master node.
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The function will always try activate the IP address of the master
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(if someone else has it, then it won't). Then, if the start_daemons
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parameter is True, it will also start the master daemons
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(ganet-masterd and ganeti-rapi).
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"""
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ok = True
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master_netdev, master_ip, _ = GetMasterInfo() |
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if not master_netdev: |
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return False |
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if utils.TcpPing(master_ip, constants.DEFAULT_NODED_PORT):
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if utils.TcpPing(master_ip, constants.DEFAULT_NODED_PORT,
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source=constants.LOCALHOST_IP_ADDRESS): |
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# we already have the ip:
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logging.debug("Already started")
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else:
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logging.error("Someone else has the master ip, not activating")
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ok = False
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else:
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result = utils.RunCmd(["ip", "address", "add", "%s/32" % master_ip, |
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"dev", master_netdev, "label", |
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"%s:0" % master_netdev])
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if result.failed:
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logging.error("Can't activate master IP: %s", result.output)
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ok = False
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result = utils.RunCmd(["arping", "-q", "-U", "-c 3", "-I", master_netdev, |
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"-s", master_ip, master_ip])
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# we'll ignore the exit code of arping
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# and now start the master and rapi daemons
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if start_daemons:
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for daemon in 'ganeti-masterd', 'ganeti-rapi': |
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result = utils.RunCmd([daemon]) |
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if result.failed:
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logging.error("Can't start daemon %s: %s", daemon, result.output)
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ok = False
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return ok
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def StopMaster(stop_daemons): |
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"""Deactivate this node as master.
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The function will always try to deactivate the IP address of the
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master. Then, if the stop_daemons parameter is True, it will also
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stop the master daemons (ganet-masterd and ganeti-rapi).
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"""
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master_netdev, master_ip, _ = GetMasterInfo() |
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if not master_netdev: |
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return False |
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result = utils.RunCmd(["ip", "address", "del", "%s/32" % master_ip, |
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"dev", master_netdev])
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if result.failed:
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logging.error("Can't remove the master IP, error: %s", result.output)
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# but otherwise ignore the failure
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if stop_daemons:
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# stop/kill the rapi and the master daemon
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for daemon in constants.RAPI_PID, constants.MASTERD_PID: |
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utils.KillProcess(utils.ReadPidFile(utils.DaemonPidFileName(daemon))) |
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return True |
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def AddNode(dsa, dsapub, rsa, rsapub, sshkey, sshpub): |
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"""Joins this node to the cluster.
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This does the following:
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- updates the hostkeys of the machine (rsa and dsa)
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- adds the ssh private key to the user
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- adds the ssh public key to the users' authorized_keys file
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"""
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sshd_keys = [(constants.SSH_HOST_RSA_PRIV, rsa, 0600),
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(constants.SSH_HOST_RSA_PUB, rsapub, 0644),
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(constants.SSH_HOST_DSA_PRIV, dsa, 0600),
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(constants.SSH_HOST_DSA_PUB, dsapub, 0644)]
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for name, content, mode in sshd_keys: |
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utils.WriteFile(name, data=content, mode=mode) |
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try:
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priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS, |
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mkdir=True)
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except errors.OpExecError, err:
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logging.exception("Error while processing user ssh files")
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return False |
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for name, content in [(priv_key, sshkey), (pub_key, sshpub)]: |
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utils.WriteFile(name, data=content, mode=0600)
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utils.AddAuthorizedKey(auth_keys, sshpub) |
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utils.RunCmd([constants.SSH_INITD_SCRIPT, "restart"])
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return True |
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def LeaveCluster(): |
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"""Cleans up the current node and prepares it to be removed from the cluster.
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"""
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_CleanDirectory(constants.DATA_DIR) |
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JobQueuePurge() |
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try:
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priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS) |
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except errors.OpExecError:
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logging.exception("Error while processing ssh files")
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return
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f = open(pub_key, 'r') |
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try:
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utils.RemoveAuthorizedKey(auth_keys, f.read(8192))
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finally:
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f.close() |
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utils.RemoveFile(priv_key) |
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utils.RemoveFile(pub_key) |
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# Return a reassuring string to the caller, and quit
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raise errors.QuitGanetiException(False, 'Shutdown scheduled') |
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def GetNodeInfo(vgname): |
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"""Gives back a hash with different informations about the node.
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Returns:
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{ 'vg_size' : xxx, 'vg_free' : xxx, 'memory_domain0': xxx,
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'memory_free' : xxx, 'memory_total' : xxx }
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where
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vg_size is the size of the configured volume group in MiB
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vg_free is the free size of the volume group in MiB
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memory_dom0 is the memory allocated for domain0 in MiB
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memory_free is the currently available (free) ram in MiB
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memory_total is the total number of ram in MiB
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"""
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outputarray = {} |
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vginfo = _GetVGInfo(vgname) |
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outputarray['vg_size'] = vginfo['vg_size'] |
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outputarray['vg_free'] = vginfo['vg_free'] |
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hyper = hypervisor.GetHypervisor() |
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hyp_info = hyper.GetNodeInfo() |
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if hyp_info is not None: |
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outputarray.update(hyp_info) |
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f = open("/proc/sys/kernel/random/boot_id", 'r') |
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try:
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outputarray["bootid"] = f.read(128).rstrip("\n") |
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finally:
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f.close() |
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return outputarray
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def VerifyNode(what): |
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"""Verify the status of the local node.
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Args:
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what - a dictionary of things to check:
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'filelist' : list of files for which to compute checksums
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'nodelist' : list of nodes we should check communication with
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'hypervisor': run the hypervisor-specific verify
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Requested files on local node are checksummed and the result returned.
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The nodelist is traversed, with the following checks being made
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for each node:
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- known_hosts key correct
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- correct resolving of node name (target node returns its own hostname
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by ssh-execution of 'hostname', result compared against name in list.
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"""
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result = {} |
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if 'hypervisor' in what: |
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result['hypervisor'] = hypervisor.GetHypervisor().Verify()
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if 'filelist' in what: |
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result['filelist'] = utils.FingerprintFiles(what['filelist']) |
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if 'nodelist' in what: |
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result['nodelist'] = {}
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random.shuffle(what['nodelist'])
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for node in what['nodelist']: |
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success, message = _GetSshRunner().VerifyNodeHostname(node) |
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if not success: |
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result['nodelist'][node] = message
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if 'node-net-test' in what: |
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result['node-net-test'] = {}
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my_name = utils.HostInfo().name |
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my_pip = my_sip = None
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for name, pip, sip in what['node-net-test']: |
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if name == my_name:
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my_pip = pip |
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my_sip = sip |
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break
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if not my_pip: |
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result['node-net-test'][my_name] = ("Can't find my own" |
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" primary/secondary IP"
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" in the node list")
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else:
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port = ssconf.SimpleStore().GetNodeDaemonPort() |
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for name, pip, sip in what['node-net-test']: |
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fail = [] |
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if not utils.TcpPing(pip, port, source=my_pip): |
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fail.append("primary")
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if sip != pip:
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if not utils.TcpPing(sip, port, source=my_sip): |
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fail.append("secondary")
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if fail:
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result['node-net-test'][name] = ("failure using the %s" |
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" interface(s)" %
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" and ".join(fail))
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return result
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def GetVolumeList(vg_name): |
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"""Compute list of logical volumes and their size.
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Returns:
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dictionary of all partions (key) with their size (in MiB), inactive
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and online status:
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{'test1': ('20.06', True, True)}
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"""
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lvs = {} |
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sep = '|'
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result = utils.RunCmd(["lvs", "--noheadings", "--units=m", "--nosuffix", |
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"--separator=%s" % sep,
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"-olv_name,lv_size,lv_attr", vg_name])
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if result.failed:
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logging.error("Failed to list logical volumes, lvs output: %s",
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result.output) |
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return result.output
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valid_line_re = re.compile("^ *([^|]+)\|([0-9.]+)\|([^|]{6})\|?$")
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for line in result.stdout.splitlines(): |
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line = line.strip() |
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match = valid_line_re.match(line) |
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if not match: |
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logging.error("Invalid line returned from lvs output: '%s'", line)
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continue
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name, size, attr = match.groups() |
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inactive = attr[4] == '-' |
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online = attr[5] == 'o' |
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lvs[name] = (size, inactive, online) |
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return lvs
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def ListVolumeGroups(): |
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"""List the volume groups and their size.
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Returns:
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Dictionary with keys volume name and values the size of the volume
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"""
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return utils.ListVolumeGroups()
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def NodeVolumes(): |
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"""List all volumes on this node.
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"""
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result = utils.RunCmd(["lvs", "--noheadings", "--units=m", "--nosuffix", |
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"--separator=|",
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"--options=lv_name,lv_size,devices,vg_name"])
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if result.failed:
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logging.error("Failed to list logical volumes, lvs output: %s",
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result.output) |
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return {}
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def parse_dev(dev): |
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if '(' in dev: |
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return dev.split('(')[0] |
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else:
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return dev
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def map_line(line): |
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return {
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'name': line[0].strip(), |
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'size': line[1].strip(), |
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'dev': parse_dev(line[2].strip()), |
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'vg': line[3].strip(), |
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} |
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return [map_line(line.split('|')) for line in result.stdout.splitlines() |
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if line.count('|') >= 3] |
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def BridgesExist(bridges_list): |
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"""Check if a list of bridges exist on the current node.
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Returns:
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True if all of them exist, false otherwise
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"""
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for bridge in bridges_list: |
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if not utils.BridgeExists(bridge): |
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return False |
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return True |
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def GetInstanceList(): |
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"""Provides a list of instances.
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Returns:
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A list of all running instances on the current node
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- instance1.example.com
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- instance2.example.com
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"""
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try:
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names = hypervisor.GetHypervisor().ListInstances() |
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except errors.HypervisorError, err:
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logging.exception("Error enumerating instances")
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raise
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return names
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def GetInstanceInfo(instance): |
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"""Gives back the informations about an instance as a dictionary.
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Args:
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instance: name of the instance (ex. instance1.example.com)
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Returns:
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{ 'memory' : 511, 'state' : '-b---', 'time' : 3188.8, }
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where
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memory: memory size of instance (int)
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state: xen state of instance (string)
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time: cpu time of instance (float)
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"""
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output = {} |
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iinfo = hypervisor.GetHypervisor().GetInstanceInfo(instance) |
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if iinfo is not None: |
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output['memory'] = iinfo[2] |
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output['state'] = iinfo[4] |
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output['time'] = iinfo[5] |
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return output
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def GetAllInstancesInfo(): |
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"""Gather data about all instances.
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This is the equivalent of `GetInstanceInfo()`, except that it
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computes data for all instances at once, thus being faster if one
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needs data about more than one instance.
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Returns: a dictionary of dictionaries, keys being the instance name,
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and with values:
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{ 'memory' : 511, 'state' : '-b---', 'time' : 3188.8, }
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where
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memory: memory size of instance (int)
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state: xen state of instance (string)
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time: cpu time of instance (float)
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vcpus: the number of cpus
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"""
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output = {} |
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iinfo = hypervisor.GetHypervisor().GetAllInstancesInfo() |
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if iinfo:
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for name, inst_id, memory, vcpus, state, times in iinfo: |
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output[name] = { |
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'memory': memory,
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'vcpus': vcpus,
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'state': state,
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'time': times,
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} |
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return output
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def AddOSToInstance(instance, os_disk, swap_disk): |
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"""Add an OS to an instance.
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Args:
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instance: the instance object
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os_disk: the instance-visible name of the os device
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swap_disk: the instance-visible name of the swap device
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"""
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inst_os = OSFromDisk(instance.os) |
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create_script = inst_os.create_script |
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os_device = instance.FindDisk(os_disk) |
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if os_device is None: |
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logging.error("Can't find this device-visible name '%s'", os_disk)
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return False |
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swap_device = instance.FindDisk(swap_disk) |
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if swap_device is None: |
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logging.error("Can't find this device-visible name '%s'", swap_disk)
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return False |
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|
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real_os_dev = _RecursiveFindBD(os_device) |
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if real_os_dev is None: |
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raise errors.BlockDeviceError("Block device '%s' is not set up" % |
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str(os_device))
|
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real_os_dev.Open() |
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|
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real_swap_dev = _RecursiveFindBD(swap_device) |
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if real_swap_dev is None: |
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raise errors.BlockDeviceError("Block device '%s' is not set up" % |
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str(swap_device))
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real_swap_dev.Open() |
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|
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logfile = "%s/add-%s-%s-%d.log" % (constants.LOG_OS_DIR, instance.os,
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instance.name, int(time.time()))
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if not os.path.exists(constants.LOG_OS_DIR): |
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os.mkdir(constants.LOG_OS_DIR, 0750)
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|
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command = utils.BuildShellCmd("cd %s && %s -i %s -b %s -s %s &>%s",
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inst_os.path, create_script, instance.name, |
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real_os_dev.dev_path, real_swap_dev.dev_path, |
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logfile) |
533 |
env = {'HYPERVISOR': ssconf.SimpleStore().GetHypervisorType()}
|
534 |
|
535 |
result = utils.RunCmd(command, env=env) |
536 |
if result.failed:
|
537 |
logging.error("os create command '%s' returned error: %s, logfile: %s,"
|
538 |
" output: %s", command, result.fail_reason, logfile,
|
539 |
result.output) |
540 |
return False |
541 |
|
542 |
return True |
543 |
|
544 |
|
545 |
def RunRenameInstance(instance, old_name, os_disk, swap_disk): |
546 |
"""Run the OS rename script for an instance.
|
547 |
|
548 |
Args:
|
549 |
instance: the instance object
|
550 |
old_name: the old name of the instance
|
551 |
os_disk: the instance-visible name of the os device
|
552 |
swap_disk: the instance-visible name of the swap device
|
553 |
|
554 |
"""
|
555 |
inst_os = OSFromDisk(instance.os) |
556 |
|
557 |
script = inst_os.rename_script |
558 |
|
559 |
os_device = instance.FindDisk(os_disk) |
560 |
if os_device is None: |
561 |
logging.error("Can't find this device-visible name '%s'", os_disk)
|
562 |
return False |
563 |
|
564 |
swap_device = instance.FindDisk(swap_disk) |
565 |
if swap_device is None: |
566 |
logging.error("Can't find this device-visible name '%s'", swap_disk)
|
567 |
return False |
568 |
|
569 |
real_os_dev = _RecursiveFindBD(os_device) |
570 |
if real_os_dev is None: |
571 |
raise errors.BlockDeviceError("Block device '%s' is not set up" % |
572 |
str(os_device))
|
573 |
real_os_dev.Open() |
574 |
|
575 |
real_swap_dev = _RecursiveFindBD(swap_device) |
576 |
if real_swap_dev is None: |
577 |
raise errors.BlockDeviceError("Block device '%s' is not set up" % |
578 |
str(swap_device))
|
579 |
real_swap_dev.Open() |
580 |
|
581 |
logfile = "%s/rename-%s-%s-%s-%d.log" % (constants.LOG_OS_DIR, instance.os,
|
582 |
old_name, |
583 |
instance.name, int(time.time()))
|
584 |
if not os.path.exists(constants.LOG_OS_DIR): |
585 |
os.mkdir(constants.LOG_OS_DIR, 0750)
|
586 |
|
587 |
command = utils.BuildShellCmd("cd %s && %s -o %s -n %s -b %s -s %s &>%s",
|
588 |
inst_os.path, script, old_name, instance.name, |
589 |
real_os_dev.dev_path, real_swap_dev.dev_path, |
590 |
logfile) |
591 |
|
592 |
result = utils.RunCmd(command) |
593 |
|
594 |
if result.failed:
|
595 |
logging.error("os create command '%s' returned error: %s output: %s",
|
596 |
command, result.fail_reason, result.output) |
597 |
return False |
598 |
|
599 |
return True |
600 |
|
601 |
|
602 |
def _GetVGInfo(vg_name): |
603 |
"""Get informations about the volume group.
|
604 |
|
605 |
Args:
|
606 |
vg_name: the volume group
|
607 |
|
608 |
Returns:
|
609 |
{ 'vg_size' : xxx, 'vg_free' : xxx, 'pv_count' : xxx }
|
610 |
where
|
611 |
vg_size is the total size of the volume group in MiB
|
612 |
vg_free is the free size of the volume group in MiB
|
613 |
pv_count are the number of physical disks in that vg
|
614 |
|
615 |
If an error occurs during gathering of data, we return the same dict
|
616 |
with keys all set to None.
|
617 |
|
618 |
"""
|
619 |
retdic = dict.fromkeys(["vg_size", "vg_free", "pv_count"]) |
620 |
|
621 |
retval = utils.RunCmd(["vgs", "-ovg_size,vg_free,pv_count", "--noheadings", |
622 |
"--nosuffix", "--units=m", "--separator=:", vg_name]) |
623 |
|
624 |
if retval.failed:
|
625 |
logging.error("volume group %s not present", vg_name)
|
626 |
return retdic
|
627 |
valarr = retval.stdout.strip().rstrip(':').split(':') |
628 |
if len(valarr) == 3: |
629 |
try:
|
630 |
retdic = { |
631 |
"vg_size": int(round(float(valarr[0]), 0)), |
632 |
"vg_free": int(round(float(valarr[1]), 0)), |
633 |
"pv_count": int(valarr[2]), |
634 |
} |
635 |
except ValueError, err: |
636 |
logging.exception("Fail to parse vgs output")
|
637 |
else:
|
638 |
logging.error("vgs output has the wrong number of fields (expected"
|
639 |
" three): %s", str(valarr)) |
640 |
return retdic
|
641 |
|
642 |
|
643 |
def _GatherBlockDevs(instance): |
644 |
"""Set up an instance's block device(s).
|
645 |
|
646 |
This is run on the primary node at instance startup. The block
|
647 |
devices must be already assembled.
|
648 |
|
649 |
"""
|
650 |
block_devices = [] |
651 |
for disk in instance.disks: |
652 |
device = _RecursiveFindBD(disk) |
653 |
if device is None: |
654 |
raise errors.BlockDeviceError("Block device '%s' is not set up." % |
655 |
str(disk))
|
656 |
device.Open() |
657 |
block_devices.append((disk, device)) |
658 |
return block_devices
|
659 |
|
660 |
|
661 |
def StartInstance(instance, extra_args): |
662 |
"""Start an instance.
|
663 |
|
664 |
Args:
|
665 |
instance - name of instance to start.
|
666 |
|
667 |
"""
|
668 |
running_instances = GetInstanceList() |
669 |
|
670 |
if instance.name in running_instances: |
671 |
return True |
672 |
|
673 |
block_devices = _GatherBlockDevs(instance) |
674 |
hyper = hypervisor.GetHypervisor() |
675 |
|
676 |
try:
|
677 |
hyper.StartInstance(instance, block_devices, extra_args) |
678 |
except errors.HypervisorError, err:
|
679 |
logging.exception("Failed to start instance")
|
680 |
return False |
681 |
|
682 |
return True |
683 |
|
684 |
|
685 |
def ShutdownInstance(instance): |
686 |
"""Shut an instance down.
|
687 |
|
688 |
Args:
|
689 |
instance - name of instance to shutdown.
|
690 |
|
691 |
"""
|
692 |
running_instances = GetInstanceList() |
693 |
|
694 |
if instance.name not in running_instances: |
695 |
return True |
696 |
|
697 |
hyper = hypervisor.GetHypervisor() |
698 |
try:
|
699 |
hyper.StopInstance(instance) |
700 |
except errors.HypervisorError, err:
|
701 |
logging.error("Failed to stop instance")
|
702 |
return False |
703 |
|
704 |
# test every 10secs for 2min
|
705 |
shutdown_ok = False
|
706 |
|
707 |
time.sleep(1)
|
708 |
for dummy in range(11): |
709 |
if instance.name not in GetInstanceList(): |
710 |
break
|
711 |
time.sleep(10)
|
712 |
else:
|
713 |
# the shutdown did not succeed
|
714 |
logging.error("shutdown of '%s' unsuccessful, using destroy", instance)
|
715 |
|
716 |
try:
|
717 |
hyper.StopInstance(instance, force=True)
|
718 |
except errors.HypervisorError, err:
|
719 |
logging.exception("Failed to stop instance")
|
720 |
return False |
721 |
|
722 |
time.sleep(1)
|
723 |
if instance.name in GetInstanceList(): |
724 |
logging.error("could not shutdown instance '%s' even by destroy",
|
725 |
instance.name) |
726 |
return False |
727 |
|
728 |
return True |
729 |
|
730 |
|
731 |
def RebootInstance(instance, reboot_type, extra_args): |
732 |
"""Reboot an instance.
|
733 |
|
734 |
Args:
|
735 |
instance - name of instance to reboot
|
736 |
reboot_type - how to reboot [soft,hard,full]
|
737 |
|
738 |
"""
|
739 |
running_instances = GetInstanceList() |
740 |
|
741 |
if instance.name not in running_instances: |
742 |
logging.error("Cannot reboot instance that is not running")
|
743 |
return False |
744 |
|
745 |
hyper = hypervisor.GetHypervisor() |
746 |
if reboot_type == constants.INSTANCE_REBOOT_SOFT:
|
747 |
try:
|
748 |
hyper.RebootInstance(instance) |
749 |
except errors.HypervisorError, err:
|
750 |
logging.exception("Failed to soft reboot instance")
|
751 |
return False |
752 |
elif reboot_type == constants.INSTANCE_REBOOT_HARD:
|
753 |
try:
|
754 |
ShutdownInstance(instance) |
755 |
StartInstance(instance, extra_args) |
756 |
except errors.HypervisorError, err:
|
757 |
logging.exception("Failed to hard reboot instance")
|
758 |
return False |
759 |
else:
|
760 |
raise errors.ParameterError("reboot_type invalid") |
761 |
|
762 |
|
763 |
return True |
764 |
|
765 |
|
766 |
def MigrateInstance(instance, target, live): |
767 |
"""Migrates an instance to another node.
|
768 |
|
769 |
"""
|
770 |
hyper = hypervisor.GetHypervisor() |
771 |
|
772 |
try:
|
773 |
hyper.MigrateInstance(instance, target, live) |
774 |
except errors.HypervisorError, err:
|
775 |
msg = "Failed to migrate instance: %s" % str(err) |
776 |
logging.error(msg) |
777 |
return (False, msg) |
778 |
return (True, "Migration successfull") |
779 |
|
780 |
|
781 |
def CreateBlockDevice(disk, size, owner, on_primary, info): |
782 |
"""Creates a block device for an instance.
|
783 |
|
784 |
Args:
|
785 |
disk: a ganeti.objects.Disk object
|
786 |
size: the size of the physical underlying device
|
787 |
owner: a string with the name of the instance
|
788 |
on_primary: a boolean indicating if it is the primary node or not
|
789 |
info: string that will be sent to the physical device creation
|
790 |
|
791 |
Returns:
|
792 |
the new unique_id of the device (this can sometime be
|
793 |
computed only after creation), or None. On secondary nodes,
|
794 |
it's not required to return anything.
|
795 |
|
796 |
"""
|
797 |
clist = [] |
798 |
if disk.children:
|
799 |
for child in disk.children: |
800 |
crdev = _RecursiveAssembleBD(child, owner, on_primary) |
801 |
if on_primary or disk.AssembleOnSecondary(): |
802 |
# we need the children open in case the device itself has to
|
803 |
# be assembled
|
804 |
crdev.Open() |
805 |
clist.append(crdev) |
806 |
try:
|
807 |
device = bdev.FindDevice(disk.dev_type, disk.physical_id, clist) |
808 |
if device is not None: |
809 |
logging.info("removing existing device %s", disk)
|
810 |
device.Remove() |
811 |
except errors.BlockDeviceError, err:
|
812 |
pass
|
813 |
|
814 |
device = bdev.Create(disk.dev_type, disk.physical_id, |
815 |
clist, size) |
816 |
if device is None: |
817 |
raise ValueError("Can't create child device for %s, %s" % |
818 |
(disk, size)) |
819 |
if on_primary or disk.AssembleOnSecondary(): |
820 |
if not device.Assemble(): |
821 |
errorstring = "Can't assemble device after creation"
|
822 |
logging.error(errorstring) |
823 |
raise errors.BlockDeviceError("%s, very unusual event - check the node" |
824 |
" daemon logs" % errorstring)
|
825 |
device.SetSyncSpeed(constants.SYNC_SPEED) |
826 |
if on_primary or disk.OpenOnSecondary(): |
827 |
device.Open(force=True)
|
828 |
DevCacheManager.UpdateCache(device.dev_path, owner, |
829 |
on_primary, disk.iv_name) |
830 |
|
831 |
device.SetInfo(info) |
832 |
|
833 |
physical_id = device.unique_id |
834 |
return physical_id
|
835 |
|
836 |
|
837 |
def RemoveBlockDevice(disk): |
838 |
"""Remove a block device.
|
839 |
|
840 |
This is intended to be called recursively.
|
841 |
|
842 |
"""
|
843 |
try:
|
844 |
# since we are removing the device, allow a partial match
|
845 |
# this allows removal of broken mirrors
|
846 |
rdev = _RecursiveFindBD(disk, allow_partial=True)
|
847 |
except errors.BlockDeviceError, err:
|
848 |
# probably can't attach
|
849 |
logging.info("Can't attach to device %s in remove", disk)
|
850 |
rdev = None
|
851 |
if rdev is not None: |
852 |
r_path = rdev.dev_path |
853 |
result = rdev.Remove() |
854 |
if result:
|
855 |
DevCacheManager.RemoveCache(r_path) |
856 |
else:
|
857 |
result = True
|
858 |
if disk.children:
|
859 |
for child in disk.children: |
860 |
result = result and RemoveBlockDevice(child)
|
861 |
return result
|
862 |
|
863 |
|
864 |
def _RecursiveAssembleBD(disk, owner, as_primary): |
865 |
"""Activate a block device for an instance.
|
866 |
|
867 |
This is run on the primary and secondary nodes for an instance.
|
868 |
|
869 |
This function is called recursively.
|
870 |
|
871 |
Args:
|
872 |
disk: a objects.Disk object
|
873 |
as_primary: if we should make the block device read/write
|
874 |
|
875 |
Returns:
|
876 |
the assembled device or None (in case no device was assembled)
|
877 |
|
878 |
If the assembly is not successful, an exception is raised.
|
879 |
|
880 |
"""
|
881 |
children = [] |
882 |
if disk.children:
|
883 |
mcn = disk.ChildrenNeeded() |
884 |
if mcn == -1: |
885 |
mcn = 0 # max number of Nones allowed |
886 |
else:
|
887 |
mcn = len(disk.children) - mcn # max number of Nones |
888 |
for chld_disk in disk.children: |
889 |
try:
|
890 |
cdev = _RecursiveAssembleBD(chld_disk, owner, as_primary) |
891 |
except errors.BlockDeviceError, err:
|
892 |
if children.count(None) >= mcn: |
893 |
raise
|
894 |
cdev = None
|
895 |
logging.debug("Error in child activation: %s", str(err)) |
896 |
children.append(cdev) |
897 |
|
898 |
if as_primary or disk.AssembleOnSecondary(): |
899 |
r_dev = bdev.AttachOrAssemble(disk.dev_type, disk.physical_id, children) |
900 |
r_dev.SetSyncSpeed(constants.SYNC_SPEED) |
901 |
result = r_dev |
902 |
if as_primary or disk.OpenOnSecondary(): |
903 |
r_dev.Open() |
904 |
DevCacheManager.UpdateCache(r_dev.dev_path, owner, |
905 |
as_primary, disk.iv_name) |
906 |
|
907 |
else:
|
908 |
result = True
|
909 |
return result
|
910 |
|
911 |
|
912 |
def AssembleBlockDevice(disk, owner, as_primary): |
913 |
"""Activate a block device for an instance.
|
914 |
|
915 |
This is a wrapper over _RecursiveAssembleBD.
|
916 |
|
917 |
Returns:
|
918 |
a /dev path for primary nodes
|
919 |
True for secondary nodes
|
920 |
|
921 |
"""
|
922 |
result = _RecursiveAssembleBD(disk, owner, as_primary) |
923 |
if isinstance(result, bdev.BlockDev): |
924 |
result = result.dev_path |
925 |
return result
|
926 |
|
927 |
|
928 |
def ShutdownBlockDevice(disk): |
929 |
"""Shut down a block device.
|
930 |
|
931 |
First, if the device is assembled (can `Attach()`), then the device
|
932 |
is shutdown. Then the children of the device are shutdown.
|
933 |
|
934 |
This function is called recursively. Note that we don't cache the
|
935 |
children or such, as oppossed to assemble, shutdown of different
|
936 |
devices doesn't require that the upper device was active.
|
937 |
|
938 |
"""
|
939 |
r_dev = _RecursiveFindBD(disk) |
940 |
if r_dev is not None: |
941 |
r_path = r_dev.dev_path |
942 |
result = r_dev.Shutdown() |
943 |
if result:
|
944 |
DevCacheManager.RemoveCache(r_path) |
945 |
else:
|
946 |
result = True
|
947 |
if disk.children:
|
948 |
for child in disk.children: |
949 |
result = result and ShutdownBlockDevice(child)
|
950 |
return result
|
951 |
|
952 |
|
953 |
def MirrorAddChildren(parent_cdev, new_cdevs): |
954 |
"""Extend a mirrored block device.
|
955 |
|
956 |
"""
|
957 |
parent_bdev = _RecursiveFindBD(parent_cdev, allow_partial=True)
|
958 |
if parent_bdev is None: |
959 |
logging.error("Can't find parent device")
|
960 |
return False |
961 |
new_bdevs = [_RecursiveFindBD(disk) for disk in new_cdevs] |
962 |
if new_bdevs.count(None) > 0: |
963 |
logging.error("Can't find new device(s) to add: %s:%s",
|
964 |
new_bdevs, new_cdevs) |
965 |
return False |
966 |
parent_bdev.AddChildren(new_bdevs) |
967 |
return True |
968 |
|
969 |
|
970 |
def MirrorRemoveChildren(parent_cdev, new_cdevs): |
971 |
"""Shrink a mirrored block device.
|
972 |
|
973 |
"""
|
974 |
parent_bdev = _RecursiveFindBD(parent_cdev) |
975 |
if parent_bdev is None: |
976 |
logging.error("Can't find parent in remove children: %s", parent_cdev)
|
977 |
return False |
978 |
devs = [] |
979 |
for disk in new_cdevs: |
980 |
rpath = disk.StaticDevPath() |
981 |
if rpath is None: |
982 |
bd = _RecursiveFindBD(disk) |
983 |
if bd is None: |
984 |
logging.error("Can't find dynamic device %s while removing children",
|
985 |
disk) |
986 |
return False |
987 |
else:
|
988 |
devs.append(bd.dev_path) |
989 |
else:
|
990 |
devs.append(rpath) |
991 |
parent_bdev.RemoveChildren(devs) |
992 |
return True |
993 |
|
994 |
|
995 |
def GetMirrorStatus(disks): |
996 |
"""Get the mirroring status of a list of devices.
|
997 |
|
998 |
Args:
|
999 |
disks: list of `objects.Disk`
|
1000 |
|
1001 |
Returns:
|
1002 |
list of (mirror_done, estimated_time) tuples, which
|
1003 |
are the result of bdev.BlockDevice.CombinedSyncStatus()
|
1004 |
|
1005 |
"""
|
1006 |
stats = [] |
1007 |
for dsk in disks: |
1008 |
rbd = _RecursiveFindBD(dsk) |
1009 |
if rbd is None: |
1010 |
raise errors.BlockDeviceError("Can't find device %s" % str(dsk)) |
1011 |
stats.append(rbd.CombinedSyncStatus()) |
1012 |
return stats
|
1013 |
|
1014 |
|
1015 |
def _RecursiveFindBD(disk, allow_partial=False): |
1016 |
"""Check if a device is activated.
|
1017 |
|
1018 |
If so, return informations about the real device.
|
1019 |
|
1020 |
Args:
|
1021 |
disk: the objects.Disk instance
|
1022 |
allow_partial: don't abort the find if a child of the
|
1023 |
device can't be found; this is intended to be
|
1024 |
used when repairing mirrors
|
1025 |
|
1026 |
Returns:
|
1027 |
None if the device can't be found
|
1028 |
otherwise the device instance
|
1029 |
|
1030 |
"""
|
1031 |
children = [] |
1032 |
if disk.children:
|
1033 |
for chdisk in disk.children: |
1034 |
children.append(_RecursiveFindBD(chdisk)) |
1035 |
|
1036 |
return bdev.FindDevice(disk.dev_type, disk.physical_id, children)
|
1037 |
|
1038 |
|
1039 |
def FindBlockDevice(disk): |
1040 |
"""Check if a device is activated.
|
1041 |
|
1042 |
If so, return informations about the real device.
|
1043 |
|
1044 |
Args:
|
1045 |
disk: the objects.Disk instance
|
1046 |
Returns:
|
1047 |
None if the device can't be found
|
1048 |
(device_path, major, minor, sync_percent, estimated_time, is_degraded)
|
1049 |
|
1050 |
"""
|
1051 |
rbd = _RecursiveFindBD(disk) |
1052 |
if rbd is None: |
1053 |
return rbd
|
1054 |
return (rbd.dev_path, rbd.major, rbd.minor) + rbd.GetSyncStatus()
|
1055 |
|
1056 |
|
1057 |
def UploadFile(file_name, data, mode, uid, gid, atime, mtime): |
1058 |
"""Write a file to the filesystem.
|
1059 |
|
1060 |
This allows the master to overwrite(!) a file. It will only perform
|
1061 |
the operation if the file belongs to a list of configuration files.
|
1062 |
|
1063 |
"""
|
1064 |
if not os.path.isabs(file_name): |
1065 |
logging.error("Filename passed to UploadFile is not absolute: '%s'",
|
1066 |
file_name) |
1067 |
return False |
1068 |
|
1069 |
allowed_files = [ |
1070 |
constants.CLUSTER_CONF_FILE, |
1071 |
constants.ETC_HOSTS, |
1072 |
constants.SSH_KNOWN_HOSTS_FILE, |
1073 |
constants.VNC_PASSWORD_FILE, |
1074 |
] |
1075 |
allowed_files.extend(ssconf.SimpleStore().GetFileList()) |
1076 |
|
1077 |
if file_name not in allowed_files: |
1078 |
logging.error("Filename passed to UploadFile not in allowed"
|
1079 |
" upload targets: '%s'", file_name)
|
1080 |
return False |
1081 |
|
1082 |
utils.WriteFile(file_name, data=data, mode=mode, uid=uid, gid=gid, |
1083 |
atime=atime, mtime=mtime) |
1084 |
return True |
1085 |
|
1086 |
|
1087 |
def _ErrnoOrStr(err): |
1088 |
"""Format an EnvironmentError exception.
|
1089 |
|
1090 |
If the `err` argument has an errno attribute, it will be looked up
|
1091 |
and converted into a textual EXXXX description. Otherwise the string
|
1092 |
representation of the error will be returned.
|
1093 |
|
1094 |
"""
|
1095 |
if hasattr(err, 'errno'): |
1096 |
detail = errno.errorcode[err.errno] |
1097 |
else:
|
1098 |
detail = str(err)
|
1099 |
return detail
|
1100 |
|
1101 |
|
1102 |
def _OSOndiskVersion(name, os_dir): |
1103 |
"""Compute and return the API version of a given OS.
|
1104 |
|
1105 |
This function will try to read the API version of the os given by
|
1106 |
the 'name' parameter and residing in the 'os_dir' directory.
|
1107 |
|
1108 |
Return value will be either an integer denoting the version or None in the
|
1109 |
case when this is not a valid OS name.
|
1110 |
|
1111 |
"""
|
1112 |
api_file = os.path.sep.join([os_dir, "ganeti_api_version"])
|
1113 |
|
1114 |
try:
|
1115 |
st = os.stat(api_file) |
1116 |
except EnvironmentError, err: |
1117 |
raise errors.InvalidOS(name, os_dir, "'ganeti_api_version' file not" |
1118 |
" found (%s)" % _ErrnoOrStr(err))
|
1119 |
|
1120 |
if not stat.S_ISREG(stat.S_IFMT(st.st_mode)): |
1121 |
raise errors.InvalidOS(name, os_dir, "'ganeti_api_version' file is not" |
1122 |
" a regular file")
|
1123 |
|
1124 |
try:
|
1125 |
f = open(api_file)
|
1126 |
try:
|
1127 |
api_version = f.read(256)
|
1128 |
finally:
|
1129 |
f.close() |
1130 |
except EnvironmentError, err: |
1131 |
raise errors.InvalidOS(name, os_dir, "error while reading the" |
1132 |
" API version (%s)" % _ErrnoOrStr(err))
|
1133 |
|
1134 |
api_version = api_version.strip() |
1135 |
try:
|
1136 |
api_version = int(api_version)
|
1137 |
except (TypeError, ValueError), err: |
1138 |
raise errors.InvalidOS(name, os_dir,
|
1139 |
"API version is not integer (%s)" % str(err)) |
1140 |
|
1141 |
return api_version
|
1142 |
|
1143 |
|
1144 |
def DiagnoseOS(top_dirs=None): |
1145 |
"""Compute the validity for all OSes.
|
1146 |
|
1147 |
Returns an OS object for each name in all the given top directories
|
1148 |
(if not given defaults to constants.OS_SEARCH_PATH)
|
1149 |
|
1150 |
Returns:
|
1151 |
list of OS objects
|
1152 |
|
1153 |
"""
|
1154 |
if top_dirs is None: |
1155 |
top_dirs = constants.OS_SEARCH_PATH |
1156 |
|
1157 |
result = [] |
1158 |
for dir_name in top_dirs: |
1159 |
if os.path.isdir(dir_name):
|
1160 |
try:
|
1161 |
f_names = utils.ListVisibleFiles(dir_name) |
1162 |
except EnvironmentError, err: |
1163 |
logging.exception("Can't list the OS directory %s", dir_name)
|
1164 |
break
|
1165 |
for name in f_names: |
1166 |
try:
|
1167 |
os_inst = OSFromDisk(name, base_dir=dir_name) |
1168 |
result.append(os_inst) |
1169 |
except errors.InvalidOS, err:
|
1170 |
result.append(objects.OS.FromInvalidOS(err)) |
1171 |
|
1172 |
return result
|
1173 |
|
1174 |
|
1175 |
def OSFromDisk(name, base_dir=None): |
1176 |
"""Create an OS instance from disk.
|
1177 |
|
1178 |
This function will return an OS instance if the given name is a
|
1179 |
valid OS name. Otherwise, it will raise an appropriate
|
1180 |
`errors.InvalidOS` exception, detailing why this is not a valid
|
1181 |
OS.
|
1182 |
|
1183 |
Args:
|
1184 |
os_dir: Directory containing the OS scripts. Defaults to a search
|
1185 |
in all the OS_SEARCH_PATH directories.
|
1186 |
|
1187 |
"""
|
1188 |
|
1189 |
if base_dir is None: |
1190 |
os_dir = utils.FindFile(name, constants.OS_SEARCH_PATH, os.path.isdir) |
1191 |
if os_dir is None: |
1192 |
raise errors.InvalidOS(name, None, "OS dir not found in search path") |
1193 |
else:
|
1194 |
os_dir = os.path.sep.join([base_dir, name]) |
1195 |
|
1196 |
api_version = _OSOndiskVersion(name, os_dir) |
1197 |
|
1198 |
if api_version != constants.OS_API_VERSION:
|
1199 |
raise errors.InvalidOS(name, os_dir, "API version mismatch" |
1200 |
" (found %s want %s)"
|
1201 |
% (api_version, constants.OS_API_VERSION)) |
1202 |
|
1203 |
# OS Scripts dictionary, we will populate it with the actual script names
|
1204 |
os_scripts = {'create': '', 'export': '', 'import': '', 'rename': ''} |
1205 |
|
1206 |
for script in os_scripts: |
1207 |
os_scripts[script] = os.path.sep.join([os_dir, script]) |
1208 |
|
1209 |
try:
|
1210 |
st = os.stat(os_scripts[script]) |
1211 |
except EnvironmentError, err: |
1212 |
raise errors.InvalidOS(name, os_dir, "'%s' script missing (%s)" % |
1213 |
(script, _ErrnoOrStr(err))) |
1214 |
|
1215 |
if stat.S_IMODE(st.st_mode) & stat.S_IXUSR != stat.S_IXUSR:
|
1216 |
raise errors.InvalidOS(name, os_dir, "'%s' script not executable" % |
1217 |
script) |
1218 |
|
1219 |
if not stat.S_ISREG(stat.S_IFMT(st.st_mode)): |
1220 |
raise errors.InvalidOS(name, os_dir, "'%s' is not a regular file" % |
1221 |
script) |
1222 |
|
1223 |
|
1224 |
return objects.OS(name=name, path=os_dir, status=constants.OS_VALID_STATUS,
|
1225 |
create_script=os_scripts['create'],
|
1226 |
export_script=os_scripts['export'],
|
1227 |
import_script=os_scripts['import'],
|
1228 |
rename_script=os_scripts['rename'],
|
1229 |
api_version=api_version) |
1230 |
|
1231 |
|
1232 |
def GrowBlockDevice(disk, amount): |
1233 |
"""Grow a stack of block devices.
|
1234 |
|
1235 |
This function is called recursively, with the childrens being the
|
1236 |
first one resize.
|
1237 |
|
1238 |
Args:
|
1239 |
disk: the disk to be grown
|
1240 |
|
1241 |
Returns: a tuple of (status, result), with:
|
1242 |
status: the result (true/false) of the operation
|
1243 |
result: the error message if the operation failed, otherwise not used
|
1244 |
|
1245 |
"""
|
1246 |
r_dev = _RecursiveFindBD(disk) |
1247 |
if r_dev is None: |
1248 |
return False, "Cannot find block device %s" % (disk,) |
1249 |
|
1250 |
try:
|
1251 |
r_dev.Grow(amount) |
1252 |
except errors.BlockDeviceError, err:
|
1253 |
return False, str(err) |
1254 |
|
1255 |
return True, None |
1256 |
|
1257 |
|
1258 |
def SnapshotBlockDevice(disk): |
1259 |
"""Create a snapshot copy of a block device.
|
1260 |
|
1261 |
This function is called recursively, and the snapshot is actually created
|
1262 |
just for the leaf lvm backend device.
|
1263 |
|
1264 |
Args:
|
1265 |
disk: the disk to be snapshotted
|
1266 |
|
1267 |
Returns:
|
1268 |
a config entry for the actual lvm device snapshotted.
|
1269 |
|
1270 |
"""
|
1271 |
if disk.children:
|
1272 |
if len(disk.children) == 1: |
1273 |
# only one child, let's recurse on it
|
1274 |
return SnapshotBlockDevice(disk.children[0]) |
1275 |
else:
|
1276 |
# more than one child, choose one that matches
|
1277 |
for child in disk.children: |
1278 |
if child.size == disk.size:
|
1279 |
# return implies breaking the loop
|
1280 |
return SnapshotBlockDevice(child)
|
1281 |
elif disk.dev_type == constants.LD_LV:
|
1282 |
r_dev = _RecursiveFindBD(disk) |
1283 |
if r_dev is not None: |
1284 |
# let's stay on the safe side and ask for the full size, for now
|
1285 |
return r_dev.Snapshot(disk.size)
|
1286 |
else:
|
1287 |
return None |
1288 |
else:
|
1289 |
raise errors.ProgrammerError("Cannot snapshot non-lvm block device" |
1290 |
" '%s' of type '%s'" %
|
1291 |
(disk.unique_id, disk.dev_type)) |
1292 |
|
1293 |
|
1294 |
def ExportSnapshot(disk, dest_node, instance): |
1295 |
"""Export a block device snapshot to a remote node.
|
1296 |
|
1297 |
Args:
|
1298 |
disk: the snapshot block device
|
1299 |
dest_node: the node to send the image to
|
1300 |
instance: instance being exported
|
1301 |
|
1302 |
Returns:
|
1303 |
True if successful, False otherwise.
|
1304 |
|
1305 |
"""
|
1306 |
inst_os = OSFromDisk(instance.os) |
1307 |
export_script = inst_os.export_script |
1308 |
|
1309 |
logfile = "%s/exp-%s-%s-%s.log" % (constants.LOG_OS_DIR, inst_os.name,
|
1310 |
instance.name, int(time.time()))
|
1311 |
if not os.path.exists(constants.LOG_OS_DIR): |
1312 |
os.mkdir(constants.LOG_OS_DIR, 0750)
|
1313 |
|
1314 |
real_os_dev = _RecursiveFindBD(disk) |
1315 |
if real_os_dev is None: |
1316 |
raise errors.BlockDeviceError("Block device '%s' is not set up" % |
1317 |
str(disk))
|
1318 |
real_os_dev.Open() |
1319 |
|
1320 |
destdir = os.path.join(constants.EXPORT_DIR, instance.name + ".new")
|
1321 |
destfile = disk.physical_id[1]
|
1322 |
|
1323 |
# the target command is built out of three individual commands,
|
1324 |
# which are joined by pipes; we check each individual command for
|
1325 |
# valid parameters
|
1326 |
|
1327 |
expcmd = utils.BuildShellCmd("cd %s; %s -i %s -b %s 2>%s", inst_os.path,
|
1328 |
export_script, instance.name, |
1329 |
real_os_dev.dev_path, logfile) |
1330 |
|
1331 |
comprcmd = "gzip"
|
1332 |
|
1333 |
destcmd = utils.BuildShellCmd("mkdir -p %s && cat > %s/%s",
|
1334 |
destdir, destdir, destfile) |
1335 |
remotecmd = _GetSshRunner().BuildCmd(dest_node, constants.GANETI_RUNAS, |
1336 |
destcmd) |
1337 |
|
1338 |
# all commands have been checked, so we're safe to combine them
|
1339 |
command = '|'.join([expcmd, comprcmd, utils.ShellQuoteArgs(remotecmd)])
|
1340 |
|
1341 |
result = utils.RunCmd(command) |
1342 |
|
1343 |
if result.failed:
|
1344 |
logging.error("os snapshot export command '%s' returned error: %s"
|
1345 |
" output: %s", command, result.fail_reason, result.output)
|
1346 |
return False |
1347 |
|
1348 |
return True |
1349 |
|
1350 |
|
1351 |
def FinalizeExport(instance, snap_disks): |
1352 |
"""Write out the export configuration information.
|
1353 |
|
1354 |
Args:
|
1355 |
instance: instance configuration
|
1356 |
snap_disks: snapshot block devices
|
1357 |
|
1358 |
Returns:
|
1359 |
False in case of error, True otherwise.
|
1360 |
|
1361 |
"""
|
1362 |
destdir = os.path.join(constants.EXPORT_DIR, instance.name + ".new")
|
1363 |
finaldestdir = os.path.join(constants.EXPORT_DIR, instance.name) |
1364 |
|
1365 |
config = objects.SerializableConfigParser() |
1366 |
|
1367 |
config.add_section(constants.INISECT_EXP) |
1368 |
config.set(constants.INISECT_EXP, 'version', '0') |
1369 |
config.set(constants.INISECT_EXP, 'timestamp', '%d' % int(time.time())) |
1370 |
config.set(constants.INISECT_EXP, 'source', instance.primary_node)
|
1371 |
config.set(constants.INISECT_EXP, 'os', instance.os)
|
1372 |
config.set(constants.INISECT_EXP, 'compression', 'gzip') |
1373 |
|
1374 |
config.add_section(constants.INISECT_INS) |
1375 |
config.set(constants.INISECT_INS, 'name', instance.name)
|
1376 |
config.set(constants.INISECT_INS, 'memory', '%d' % instance.memory) |
1377 |
config.set(constants.INISECT_INS, 'vcpus', '%d' % instance.vcpus) |
1378 |
config.set(constants.INISECT_INS, 'disk_template', instance.disk_template)
|
1379 |
|
1380 |
nic_count = 0
|
1381 |
for nic_count, nic in enumerate(instance.nics): |
1382 |
config.set(constants.INISECT_INS, 'nic%d_mac' %
|
1383 |
nic_count, '%s' % nic.mac)
|
1384 |
config.set(constants.INISECT_INS, 'nic%d_ip' % nic_count, '%s' % nic.ip) |
1385 |
config.set(constants.INISECT_INS, 'nic%d_bridge' % nic_count,
|
1386 |
'%s' % nic.bridge)
|
1387 |
# TODO: redundant: on load can read nics until it doesn't exist
|
1388 |
config.set(constants.INISECT_INS, 'nic_count' , '%d' % nic_count) |
1389 |
|
1390 |
disk_count = 0
|
1391 |
for disk_count, disk in enumerate(snap_disks): |
1392 |
config.set(constants.INISECT_INS, 'disk%d_ivname' % disk_count,
|
1393 |
('%s' % disk.iv_name))
|
1394 |
config.set(constants.INISECT_INS, 'disk%d_dump' % disk_count,
|
1395 |
('%s' % disk.physical_id[1])) |
1396 |
config.set(constants.INISECT_INS, 'disk%d_size' % disk_count,
|
1397 |
('%d' % disk.size))
|
1398 |
config.set(constants.INISECT_INS, 'disk_count' , '%d' % disk_count) |
1399 |
|
1400 |
cff = os.path.join(destdir, constants.EXPORT_CONF_FILE) |
1401 |
cfo = open(cff, 'w') |
1402 |
try:
|
1403 |
config.write(cfo) |
1404 |
finally:
|
1405 |
cfo.close() |
1406 |
|
1407 |
shutil.rmtree(finaldestdir, True)
|
1408 |
shutil.move(destdir, finaldestdir) |
1409 |
|
1410 |
return True |
1411 |
|
1412 |
|
1413 |
def ExportInfo(dest): |
1414 |
"""Get export configuration information.
|
1415 |
|
1416 |
Args:
|
1417 |
dest: directory containing the export
|
1418 |
|
1419 |
Returns:
|
1420 |
A serializable config file containing the export info.
|
1421 |
|
1422 |
"""
|
1423 |
cff = os.path.join(dest, constants.EXPORT_CONF_FILE) |
1424 |
|
1425 |
config = objects.SerializableConfigParser() |
1426 |
config.read(cff) |
1427 |
|
1428 |
if (not config.has_section(constants.INISECT_EXP) or |
1429 |
not config.has_section(constants.INISECT_INS)):
|
1430 |
return None |
1431 |
|
1432 |
return config
|
1433 |
|
1434 |
|
1435 |
def ImportOSIntoInstance(instance, os_disk, swap_disk, src_node, src_image): |
1436 |
"""Import an os image into an instance.
|
1437 |
|
1438 |
Args:
|
1439 |
instance: the instance object
|
1440 |
os_disk: the instance-visible name of the os device
|
1441 |
swap_disk: the instance-visible name of the swap device
|
1442 |
src_node: node holding the source image
|
1443 |
src_image: path to the source image on src_node
|
1444 |
|
1445 |
Returns:
|
1446 |
False in case of error, True otherwise.
|
1447 |
|
1448 |
"""
|
1449 |
inst_os = OSFromDisk(instance.os) |
1450 |
import_script = inst_os.import_script |
1451 |
|
1452 |
os_device = instance.FindDisk(os_disk) |
1453 |
if os_device is None: |
1454 |
logging.error("Can't find this device-visible name '%s'", os_disk)
|
1455 |
return False |
1456 |
|
1457 |
swap_device = instance.FindDisk(swap_disk) |
1458 |
if swap_device is None: |
1459 |
logging.error("Can't find this device-visible name '%s'", swap_disk)
|
1460 |
return False |
1461 |
|
1462 |
real_os_dev = _RecursiveFindBD(os_device) |
1463 |
if real_os_dev is None: |
1464 |
raise errors.BlockDeviceError("Block device '%s' is not set up" % |
1465 |
str(os_device))
|
1466 |
real_os_dev.Open() |
1467 |
|
1468 |
real_swap_dev = _RecursiveFindBD(swap_device) |
1469 |
if real_swap_dev is None: |
1470 |
raise errors.BlockDeviceError("Block device '%s' is not set up" % |
1471 |
str(swap_device))
|
1472 |
real_swap_dev.Open() |
1473 |
|
1474 |
logfile = "%s/import-%s-%s-%s.log" % (constants.LOG_OS_DIR, instance.os,
|
1475 |
instance.name, int(time.time()))
|
1476 |
if not os.path.exists(constants.LOG_OS_DIR): |
1477 |
os.mkdir(constants.LOG_OS_DIR, 0750)
|
1478 |
|
1479 |
destcmd = utils.BuildShellCmd('cat %s', src_image)
|
1480 |
remotecmd = _GetSshRunner().BuildCmd(src_node, constants.GANETI_RUNAS, |
1481 |
destcmd) |
1482 |
|
1483 |
comprcmd = "gunzip"
|
1484 |
impcmd = utils.BuildShellCmd("(cd %s; %s -i %s -b %s -s %s &>%s)",
|
1485 |
inst_os.path, import_script, instance.name, |
1486 |
real_os_dev.dev_path, real_swap_dev.dev_path, |
1487 |
logfile) |
1488 |
|
1489 |
command = '|'.join([utils.ShellQuoteArgs(remotecmd), comprcmd, impcmd])
|
1490 |
env = {'HYPERVISOR': ssconf.SimpleStore().GetHypervisorType()}
|
1491 |
|
1492 |
result = utils.RunCmd(command, env=env) |
1493 |
|
1494 |
if result.failed:
|
1495 |
logging.error("os import command '%s' returned error: %s"
|
1496 |
" output: %s", command, result.fail_reason, result.output)
|
1497 |
return False |
1498 |
|
1499 |
return True |
1500 |
|
1501 |
|
1502 |
def ListExports(): |
1503 |
"""Return a list of exports currently available on this machine.
|
1504 |
|
1505 |
"""
|
1506 |
if os.path.isdir(constants.EXPORT_DIR):
|
1507 |
return utils.ListVisibleFiles(constants.EXPORT_DIR)
|
1508 |
else:
|
1509 |
return []
|
1510 |
|
1511 |
|
1512 |
def RemoveExport(export): |
1513 |
"""Remove an existing export from the node.
|
1514 |
|
1515 |
Args:
|
1516 |
export: the name of the export to remove
|
1517 |
|
1518 |
Returns:
|
1519 |
False in case of error, True otherwise.
|
1520 |
|
1521 |
"""
|
1522 |
target = os.path.join(constants.EXPORT_DIR, export) |
1523 |
|
1524 |
shutil.rmtree(target) |
1525 |
# TODO: catch some of the relevant exceptions and provide a pretty
|
1526 |
# error message if rmtree fails.
|
1527 |
|
1528 |
return True |
1529 |
|
1530 |
|
1531 |
def RenameBlockDevices(devlist): |
1532 |
"""Rename a list of block devices.
|
1533 |
|
1534 |
The devlist argument is a list of tuples (disk, new_logical,
|
1535 |
new_physical). The return value will be a combined boolean result
|
1536 |
(True only if all renames succeeded).
|
1537 |
|
1538 |
"""
|
1539 |
result = True
|
1540 |
for disk, unique_id in devlist: |
1541 |
dev = _RecursiveFindBD(disk) |
1542 |
if dev is None: |
1543 |
result = False
|
1544 |
continue
|
1545 |
try:
|
1546 |
old_rpath = dev.dev_path |
1547 |
dev.Rename(unique_id) |
1548 |
new_rpath = dev.dev_path |
1549 |
if old_rpath != new_rpath:
|
1550 |
DevCacheManager.RemoveCache(old_rpath) |
1551 |
# FIXME: we should add the new cache information here, like:
|
1552 |
# DevCacheManager.UpdateCache(new_rpath, owner, ...)
|
1553 |
# but we don't have the owner here - maybe parse from existing
|
1554 |
# cache? for now, we only lose lvm data when we rename, which
|
1555 |
# is less critical than DRBD or MD
|
1556 |
except errors.BlockDeviceError, err:
|
1557 |
logging.exception("Can't rename device '%s' to '%s'", dev, unique_id)
|
1558 |
result = False
|
1559 |
return result
|
1560 |
|
1561 |
|
1562 |
def _TransformFileStorageDir(file_storage_dir): |
1563 |
"""Checks whether given file_storage_dir is valid.
|
1564 |
|
1565 |
Checks wheter the given file_storage_dir is within the cluster-wide
|
1566 |
default file_storage_dir stored in SimpleStore. Only paths under that
|
1567 |
directory are allowed.
|
1568 |
|
1569 |
Args:
|
1570 |
file_storage_dir: string with path
|
1571 |
|
1572 |
Returns:
|
1573 |
normalized file_storage_dir (string) if valid, None otherwise
|
1574 |
|
1575 |
"""
|
1576 |
file_storage_dir = os.path.normpath(file_storage_dir) |
1577 |
base_file_storage_dir = ssconf.SimpleStore().GetFileStorageDir() |
1578 |
if (not os.path.commonprefix([file_storage_dir, base_file_storage_dir]) == |
1579 |
base_file_storage_dir): |
1580 |
logging.error("file storage directory '%s' is not under base file"
|
1581 |
" storage directory '%s'",
|
1582 |
file_storage_dir, base_file_storage_dir) |
1583 |
return None |
1584 |
return file_storage_dir
|
1585 |
|
1586 |
|
1587 |
def CreateFileStorageDir(file_storage_dir): |
1588 |
"""Create file storage directory.
|
1589 |
|
1590 |
Args:
|
1591 |
file_storage_dir: string containing the path
|
1592 |
|
1593 |
Returns:
|
1594 |
tuple with first element a boolean indicating wheter dir
|
1595 |
creation was successful or not
|
1596 |
|
1597 |
"""
|
1598 |
file_storage_dir = _TransformFileStorageDir(file_storage_dir) |
1599 |
result = True,
|
1600 |
if not file_storage_dir: |
1601 |
result = False,
|
1602 |
else:
|
1603 |
if os.path.exists(file_storage_dir):
|
1604 |
if not os.path.isdir(file_storage_dir): |
1605 |
logging.error("'%s' is not a directory", file_storage_dir)
|
1606 |
result = False,
|
1607 |
else:
|
1608 |
try:
|
1609 |
os.makedirs(file_storage_dir, 0750)
|
1610 |
except OSError, err: |
1611 |
logging.error("Cannot create file storage directory '%s': %s",
|
1612 |
file_storage_dir, err) |
1613 |
result = False,
|
1614 |
return result
|
1615 |
|
1616 |
|
1617 |
def RemoveFileStorageDir(file_storage_dir): |
1618 |
"""Remove file storage directory.
|
1619 |
|
1620 |
Remove it only if it's empty. If not log an error and return.
|
1621 |
|
1622 |
Args:
|
1623 |
file_storage_dir: string containing the path
|
1624 |
|
1625 |
Returns:
|
1626 |
tuple with first element a boolean indicating wheter dir
|
1627 |
removal was successful or not
|
1628 |
|
1629 |
"""
|
1630 |
file_storage_dir = _TransformFileStorageDir(file_storage_dir) |
1631 |
result = True,
|
1632 |
if not file_storage_dir: |
1633 |
result = False,
|
1634 |
else:
|
1635 |
if os.path.exists(file_storage_dir):
|
1636 |
if not os.path.isdir(file_storage_dir): |
1637 |
logging.error("'%s' is not a directory", file_storage_dir)
|
1638 |
result = False,
|
1639 |
# deletes dir only if empty, otherwise we want to return False
|
1640 |
try:
|
1641 |
os.rmdir(file_storage_dir) |
1642 |
except OSError, err: |
1643 |
logging.exception("Cannot remove file storage directory '%s'",
|
1644 |
file_storage_dir) |
1645 |
result = False,
|
1646 |
return result
|
1647 |
|
1648 |
|
1649 |
def RenameFileStorageDir(old_file_storage_dir, new_file_storage_dir): |
1650 |
"""Rename the file storage directory.
|
1651 |
|
1652 |
Args:
|
1653 |
old_file_storage_dir: string containing the old path
|
1654 |
new_file_storage_dir: string containing the new path
|
1655 |
|
1656 |
Returns:
|
1657 |
tuple with first element a boolean indicating wheter dir
|
1658 |
rename was successful or not
|
1659 |
|
1660 |
"""
|
1661 |
old_file_storage_dir = _TransformFileStorageDir(old_file_storage_dir) |
1662 |
new_file_storage_dir = _TransformFileStorageDir(new_file_storage_dir) |
1663 |
result = True,
|
1664 |
if not old_file_storage_dir or not new_file_storage_dir: |
1665 |
result = False,
|
1666 |
else:
|
1667 |
if not os.path.exists(new_file_storage_dir): |
1668 |
if os.path.isdir(old_file_storage_dir):
|
1669 |
try:
|
1670 |
os.rename(old_file_storage_dir, new_file_storage_dir) |
1671 |
except OSError, err: |
1672 |
logging.exception("Cannot rename '%s' to '%s'",
|
1673 |
old_file_storage_dir, new_file_storage_dir) |
1674 |
result = False,
|
1675 |
else:
|
1676 |
logging.error("'%s' is not a directory", old_file_storage_dir)
|
1677 |
result = False,
|
1678 |
else:
|
1679 |
if os.path.exists(old_file_storage_dir):
|
1680 |
logging.error("Cannot rename '%s' to '%s'. Both locations exist.",
|
1681 |
old_file_storage_dir, new_file_storage_dir) |
1682 |
result = False,
|
1683 |
return result
|
1684 |
|
1685 |
|
1686 |
def _IsJobQueueFile(file_name): |
1687 |
"""Checks whether the given filename is in the queue directory.
|
1688 |
|
1689 |
"""
|
1690 |
queue_dir = os.path.normpath(constants.QUEUE_DIR) |
1691 |
result = (os.path.commonprefix([queue_dir, file_name]) == queue_dir) |
1692 |
|
1693 |
if not result: |
1694 |
logging.error("'%s' is not a file in the queue directory",
|
1695 |
file_name) |
1696 |
|
1697 |
return result
|
1698 |
|
1699 |
|
1700 |
def JobQueueUpdate(file_name, content): |
1701 |
"""Updates a file in the queue directory.
|
1702 |
|
1703 |
"""
|
1704 |
if not _IsJobQueueFile(file_name): |
1705 |
return False |
1706 |
|
1707 |
# Write and replace the file atomically
|
1708 |
utils.WriteFile(file_name, data=content) |
1709 |
|
1710 |
return True |
1711 |
|
1712 |
|
1713 |
def JobQueueRename(old, new): |
1714 |
"""Renames a job queue file.
|
1715 |
|
1716 |
"""
|
1717 |
if not (_IsJobQueueFile(old) and _IsJobQueueFile(new)): |
1718 |
return False |
1719 |
|
1720 |
os.rename(old, new) |
1721 |
|
1722 |
return True |
1723 |
|
1724 |
|
1725 |
def CloseBlockDevices(disks): |
1726 |
"""Closes the given block devices.
|
1727 |
|
1728 |
This means they will be switched to secondary mode (in case of DRBD).
|
1729 |
|
1730 |
"""
|
1731 |
bdevs = [] |
1732 |
for cf in disks: |
1733 |
rd = _RecursiveFindBD(cf) |
1734 |
if rd is None: |
1735 |
return (False, "Can't find device %s" % cf) |
1736 |
bdevs.append(rd) |
1737 |
|
1738 |
msg = [] |
1739 |
for rd in bdevs: |
1740 |
try:
|
1741 |
rd.Close() |
1742 |
except errors.BlockDeviceError, err:
|
1743 |
msg.append(str(err))
|
1744 |
if msg:
|
1745 |
return (False, "Can't make devices secondary: %s" % ",".join(msg)) |
1746 |
else:
|
1747 |
return (True, "All devices secondary") |
1748 |
|
1749 |
|
1750 |
class HooksRunner(object): |
1751 |
"""Hook runner.
|
1752 |
|
1753 |
This class is instantiated on the node side (ganeti-noded) and not on
|
1754 |
the master side.
|
1755 |
|
1756 |
"""
|
1757 |
RE_MASK = re.compile("^[a-zA-Z0-9_-]+$")
|
1758 |
|
1759 |
def __init__(self, hooks_base_dir=None): |
1760 |
"""Constructor for hooks runner.
|
1761 |
|
1762 |
Args:
|
1763 |
- hooks_base_dir: if not None, this overrides the
|
1764 |
constants.HOOKS_BASE_DIR (useful for unittests)
|
1765 |
|
1766 |
"""
|
1767 |
if hooks_base_dir is None: |
1768 |
hooks_base_dir = constants.HOOKS_BASE_DIR |
1769 |
self._BASE_DIR = hooks_base_dir
|
1770 |
|
1771 |
@staticmethod
|
1772 |
def ExecHook(script, env): |
1773 |
"""Exec one hook script.
|
1774 |
|
1775 |
Args:
|
1776 |
- script: the full path to the script
|
1777 |
- env: the environment with which to exec the script
|
1778 |
|
1779 |
"""
|
1780 |
# exec the process using subprocess and log the output
|
1781 |
fdstdin = None
|
1782 |
try:
|
1783 |
fdstdin = open("/dev/null", "r") |
1784 |
child = subprocess.Popen([script], stdin=fdstdin, stdout=subprocess.PIPE, |
1785 |
stderr=subprocess.STDOUT, close_fds=True,
|
1786 |
shell=False, cwd="/", env=env) |
1787 |
output = ""
|
1788 |
try:
|
1789 |
output = child.stdout.read(4096)
|
1790 |
child.stdout.close() |
1791 |
except EnvironmentError, err: |
1792 |
output += "Hook script error: %s" % str(err) |
1793 |
|
1794 |
while True: |
1795 |
try:
|
1796 |
result = child.wait() |
1797 |
break
|
1798 |
except EnvironmentError, err: |
1799 |
if err.errno == errno.EINTR:
|
1800 |
continue
|
1801 |
raise
|
1802 |
finally:
|
1803 |
# try not to leak fds
|
1804 |
for fd in (fdstdin, ): |
1805 |
if fd is not None: |
1806 |
try:
|
1807 |
fd.close() |
1808 |
except EnvironmentError, err: |
1809 |
# just log the error
|
1810 |
#logging.exception("Error while closing fd %s", fd)
|
1811 |
pass
|
1812 |
|
1813 |
return result == 0, output |
1814 |
|
1815 |
def RunHooks(self, hpath, phase, env): |
1816 |
"""Run the scripts in the hooks directory.
|
1817 |
|
1818 |
This method will not be usually overriden by child opcodes.
|
1819 |
|
1820 |
"""
|
1821 |
if phase == constants.HOOKS_PHASE_PRE:
|
1822 |
suffix = "pre"
|
1823 |
elif phase == constants.HOOKS_PHASE_POST:
|
1824 |
suffix = "post"
|
1825 |
else:
|
1826 |
raise errors.ProgrammerError("Unknown hooks phase: '%s'" % phase) |
1827 |
rr = [] |
1828 |
|
1829 |
subdir = "%s-%s.d" % (hpath, suffix)
|
1830 |
dir_name = "%s/%s" % (self._BASE_DIR, subdir) |
1831 |
try:
|
1832 |
dir_contents = utils.ListVisibleFiles(dir_name) |
1833 |
except OSError, err: |
1834 |
# must log
|
1835 |
return rr
|
1836 |
|
1837 |
# we use the standard python sort order,
|
1838 |
# so 00name is the recommended naming scheme
|
1839 |
dir_contents.sort() |
1840 |
for relname in dir_contents: |
1841 |
fname = os.path.join(dir_name, relname) |
1842 |
if not (os.path.isfile(fname) and os.access(fname, os.X_OK) and |
1843 |
self.RE_MASK.match(relname) is not None): |
1844 |
rrval = constants.HKR_SKIP |
1845 |
output = ""
|
1846 |
else:
|
1847 |
result, output = self.ExecHook(fname, env)
|
1848 |
if not result: |
1849 |
rrval = constants.HKR_FAIL |
1850 |
else:
|
1851 |
rrval = constants.HKR_SUCCESS |
1852 |
rr.append(("%s/%s" % (subdir, relname), rrval, output))
|
1853 |
|
1854 |
return rr
|
1855 |
|
1856 |
|
1857 |
class IAllocatorRunner(object): |
1858 |
"""IAllocator runner.
|
1859 |
|
1860 |
This class is instantiated on the node side (ganeti-noded) and not on
|
1861 |
the master side.
|
1862 |
|
1863 |
"""
|
1864 |
def Run(self, name, idata): |
1865 |
"""Run an iallocator script.
|
1866 |
|
1867 |
Return value: tuple of:
|
1868 |
- run status (one of the IARUN_ constants)
|
1869 |
- stdout
|
1870 |
- stderr
|
1871 |
- fail reason (as from utils.RunResult)
|
1872 |
|
1873 |
"""
|
1874 |
alloc_script = utils.FindFile(name, constants.IALLOCATOR_SEARCH_PATH, |
1875 |
os.path.isfile) |
1876 |
if alloc_script is None: |
1877 |
return (constants.IARUN_NOTFOUND, None, None, None) |
1878 |
|
1879 |
fd, fin_name = tempfile.mkstemp(prefix="ganeti-iallocator.")
|
1880 |
try:
|
1881 |
os.write(fd, idata) |
1882 |
os.close(fd) |
1883 |
result = utils.RunCmd([alloc_script, fin_name]) |
1884 |
if result.failed:
|
1885 |
return (constants.IARUN_FAILURE, result.stdout, result.stderr,
|
1886 |
result.fail_reason) |
1887 |
finally:
|
1888 |
os.unlink(fin_name) |
1889 |
|
1890 |
return (constants.IARUN_SUCCESS, result.stdout, result.stderr, None) |
1891 |
|
1892 |
|
1893 |
class DevCacheManager(object): |
1894 |
"""Simple class for managing a cache of block device information.
|
1895 |
|
1896 |
"""
|
1897 |
_DEV_PREFIX = "/dev/"
|
1898 |
_ROOT_DIR = constants.BDEV_CACHE_DIR |
1899 |
|
1900 |
@classmethod
|
1901 |
def _ConvertPath(cls, dev_path): |
1902 |
"""Converts a /dev/name path to the cache file name.
|
1903 |
|
1904 |
This replaces slashes with underscores and strips the /dev
|
1905 |
prefix. It then returns the full path to the cache file
|
1906 |
|
1907 |
"""
|
1908 |
if dev_path.startswith(cls._DEV_PREFIX):
|
1909 |
dev_path = dev_path[len(cls._DEV_PREFIX):]
|
1910 |
dev_path = dev_path.replace("/", "_") |
1911 |
fpath = "%s/bdev_%s" % (cls._ROOT_DIR, dev_path)
|
1912 |
return fpath
|
1913 |
|
1914 |
@classmethod
|
1915 |
def UpdateCache(cls, dev_path, owner, on_primary, iv_name): |
1916 |
"""Updates the cache information for a given device.
|
1917 |
|
1918 |
"""
|
1919 |
if dev_path is None: |
1920 |
logging.error("DevCacheManager.UpdateCache got a None dev_path")
|
1921 |
return
|
1922 |
fpath = cls._ConvertPath(dev_path) |
1923 |
if on_primary:
|
1924 |
state = "primary"
|
1925 |
else:
|
1926 |
state = "secondary"
|
1927 |
if iv_name is None: |
1928 |
iv_name = "not_visible"
|
1929 |
fdata = "%s %s %s\n" % (str(owner), state, iv_name) |
1930 |
try:
|
1931 |
utils.WriteFile(fpath, data=fdata) |
1932 |
except EnvironmentError, err: |
1933 |
logging.exception("Can't update bdev cache for %s", dev_path)
|
1934 |
|
1935 |
@classmethod
|
1936 |
def RemoveCache(cls, dev_path): |
1937 |
"""Remove data for a dev_path.
|
1938 |
|
1939 |
"""
|
1940 |
if dev_path is None: |
1941 |
logging.error("DevCacheManager.RemoveCache got a None dev_path")
|
1942 |
return
|
1943 |
fpath = cls._ConvertPath(dev_path) |
1944 |
try:
|
1945 |
utils.RemoveFile(fpath) |
1946 |
except EnvironmentError, err: |
1947 |
logging.exception("Can't update bdev cache for %s", dev_path)
|