-#!/usr/bin/python
+#
#
-# Copyright (C) 2006, 2007 Google Inc.
+# Copyright (C) 2006, 2007, 2008 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
"""
-import os
-import tempfile
-import errno
-import socket
+import sys
+import re
from ganeti import errors
from ganeti import constants
+from ganeti import utils
+from ganeti import serializer
+
+
+SSCONF_LOCK_TIMEOUT = 10
+
+RE_VALID_SSCONF_NAME = re.compile(r'^[-_a-z0-9]+$')
+
+
+class SimpleConfigReader(object):
+ """Simple class to read configuration file.
+
+ """
+ def __init__(self, file_name=constants.CLUSTER_CONF_FILE):
+ """Initializes this class.
+
+ @type file_name: string
+ @param file_name: Configuration file path
+ """
+ self._file_name = file_name
+ self._config_data = serializer.Load(utils.ReadFile(file_name))
+ # TODO: Error handling
+
+ def GetClusterName(self):
+ return self._config_data["cluster"]["cluster_name"]
-class SimpleStore:
+ def GetHostKey(self):
+ return self._config_data["cluster"]["rsahostkeypub"]
+
+ def GetMasterNode(self):
+ return self._config_data["cluster"]["master_node"]
+
+ def GetMasterIP(self):
+ return self._config_data["cluster"]["master_ip"]
+
+ def GetMasterNetdev(self):
+ return self._config_data["cluster"]["master_netdev"]
+
+ def GetFileStorageDir(self):
+ return self._config_data["cluster"]["file_storage_dir"]
+
+ def GetHypervisorType(self):
+ return self._config_data["cluster"]["hypervisor"]
+
+ def GetNodeList(self):
+ return self._config_data["nodes"].keys()
+
+ @classmethod
+ def FromDict(cls, val, cfg_file=constants.CLUSTER_CONF_FILE):
+ """Alternative construction from a dictionary.
+
+ """
+ obj = SimpleConfigReader.__new__(cls)
+ obj._config_data = val
+ obj._file_name = cfg_file
+ return obj
+
+
+class SimpleConfigWriter(SimpleConfigReader):
+ """Simple class to write configuration file.
+
+ """
+ def Save(self):
+ """Writes configuration file.
+
+ Warning: Doesn't take care of locking or synchronizing with other
+ processes.
+
+ """
+ utils.WriteFile(self._file_name,
+ data=serializer.Dump(self._config_data),
+ mode=0600)
+
+
+class SimpleStore(object):
"""Interface to static cluster data.
- This is different that the config.ConfigWriter class in that it
- holds data that is (mostly) constant after the cluster
- initialization. Its purpose is to allow limited customization of
- things which would otherwise normally live in constants.py. Note
- that this data cannot live in ConfigWriter as that is available only
- on the master node, and our data must be readable by both the master
- and the nodes.
+ This is different that the config.ConfigWriter and
+ SimpleConfigReader classes in that it holds data that will always be
+ present, even on nodes which don't have all the cluster data.
Other particularities of the datastore:
- keys are restricted to predefined values
- - values are small (<4k)
- - since the data is practically static, read keys are cached in memory
- - some keys are handled specially (read from the system, so
- we can't update them)
"""
_SS_FILEPREFIX = "ssconf_"
- SS_HYPERVISOR = "hypervisor"
- SS_NODED_PASS = "node_pass"
- SS_MASTER_NODE = "master_node"
- SS_MASTER_IP = "master_ip"
- SS_MASTER_NETDEV = "master_netdev"
- SS_CLUSTER_NAME = "cluster_name"
- _VALID_KEYS = (SS_HYPERVISOR, SS_NODED_PASS, SS_MASTER_NODE, SS_MASTER_IP,
- SS_MASTER_NETDEV, SS_CLUSTER_NAME)
- _MAX_SIZE = 4096
+ _VALID_KEYS = (
+ constants.SS_CLUSTER_NAME,
+ constants.SS_CLUSTER_TAGS,
+ constants.SS_FILE_STORAGE_DIR,
+ constants.SS_MASTER_CANDIDATES,
+ constants.SS_MASTER_IP,
+ constants.SS_MASTER_NETDEV,
+ constants.SS_MASTER_NODE,
+ constants.SS_NODE_LIST,
+ constants.SS_OFFLINE_NODES,
+ constants.SS_ONLINE_NODES,
+ constants.SS_INSTANCE_LIST,
+ constants.SS_RELEASE_VERSION,
+ )
+ _MAX_SIZE = 131072
def __init__(self, cfg_location=None):
if cfg_location is None:
self._cfg_dir = constants.DATA_DIR
else:
self._cfg_dir = cfg_location
- self._cache = {}
def KeyToFilename(self, key):
"""Convert a given key into filename.
will be changed into ConfigurationErrors.
"""
- if key in self._cache:
- return self._cache[key]
filename = self.KeyToFilename(key)
try:
fh = file(filename, 'r')
try:
- data = fh.readline(self._MAX_SIZE)
+ data = fh.read(self._MAX_SIZE)
data = data.rstrip('\n')
finally:
fh.close()
except EnvironmentError, err:
raise errors.ConfigurationError("Can't read from the ssconf file:"
" '%s'" % str(err))
- self._cache[key] = data
return data
- def GetNodeDaemonPort(self):
- """Get the node daemon port for this cluster.
+ def WriteFiles(self, values):
+ """Writes ssconf files used by external scripts.
- Note that this routine does not read a ganeti-specific file, but
- instead uses socket.getservbyname to allow pre-customization of
- this parameter outside of ganeti.
+ @type values: dict
+ @param values: Dictionary of (name, value)
"""
+ ssconf_lock = utils.FileLock(constants.SSCONF_LOCK_FILE)
+
+ # Get lock while writing files
+ ssconf_lock.Exclusive(blocking=True, timeout=SSCONF_LOCK_TIMEOUT)
try:
- port = socket.getservbyname("ganeti-noded", "tcp")
- except socket.error:
- port = constants.DEFAULT_NODED_PORT
+ for name, value in values.iteritems():
+ if value and not value.endswith("\n"):
+ value += "\n"
+ utils.WriteFile(self.KeyToFilename(name), data=value, mode=0444)
+ finally:
+ ssconf_lock.Unlock()
- return port
+ def GetFileList(self):
+ """Return the list of all config files.
- def GetHypervisorType(self):
- """Get the hypervisor type for this cluster.
+ This is used for computing node replication data.
"""
- return self._ReadFile(self.SS_HYPERVISOR)
+ return [self.KeyToFilename(key) for key in self._VALID_KEYS]
- def GetNodeDaemonPassword(self):
- """Get the node password for this cluster.
+ def GetClusterName(self):
+ """Get the cluster name.
"""
- return self._ReadFile(self.SS_NODED_PASS)
+ return self._ReadFile(constants.SS_CLUSTER_NAME)
- def GetMasterNode(self):
- """Get the hostname of the master node for this cluster.
+ def GetFileStorageDir(self):
+ """Get the file storage dir.
"""
- return self._ReadFile(self.SS_MASTER_NODE)
+ return self._ReadFile(constants.SS_FILE_STORAGE_DIR)
+
+ def GetMasterCandidates(self):
+ """Return the list of master candidates.
+
+ """
+ data = self._ReadFile(constants.SS_MASTER_CANDIDATES)
+ nl = data.splitlines(False)
+ return nl
def GetMasterIP(self):
"""Get the IP of the master node for this cluster.
"""
- return self._ReadFile(self.SS_MASTER_IP)
+ return self._ReadFile(constants.SS_MASTER_IP)
def GetMasterNetdev(self):
"""Get the netdev to which we'll add the master ip.
"""
- return self._ReadFile(self.SS_MASTER_NETDEV)
+ return self._ReadFile(constants.SS_MASTER_NETDEV)
- def GetClusterName(self):
- """Get the cluster name.
+ def GetMasterNode(self):
+ """Get the hostname of the master node for this cluster.
"""
- return self._ReadFile(self.SS_CLUSTER_NAME)
+ return self._ReadFile(constants.SS_MASTER_NODE)
+
+ def GetNodeList(self):
+ """Return the list of cluster nodes.
- def SetKey(self, key, value):
- """Set the value of a key.
+ """
+ data = self._ReadFile(constants.SS_NODE_LIST)
+ nl = data.splitlines(False)
+ return nl
- This should be used only when adding a node to a cluster.
+ def GetClusterTags(self):
+ """Return the cluster tags.
"""
- file_name = self.KeyToFilename(key)
- dir_name, small_name = os.path.split(file_name)
- fd, new_name = tempfile.mkstemp('.new', small_name, dir_name)
- # here we need to make sure we remove the temp file, if any error
- # leaves it in place
- try:
- os.chown(new_name, 0, 0)
- os.chmod(new_name, 0400)
- os.write(fd, "%s\n" % str(value))
- os.fsync(fd)
- os.rename(new_name, file_name)
- self._cache[key] = value
- finally:
- os.close(fd)
- try:
- os.unlink(new_name)
- except OSError, err:
- if err.errno != errno.ENOENT:
- raise
+ data = self._ReadFile(constants.SS_CLUSTER_TAGS)
+ nl = data.splitlines(False)
+ return nl
- def GetFileList(self):
- """Return the lis of all config files.
- This is used for computing node replication data.
+def GetMasterAndMyself(ss=None):
+ """Get the master node and my own hostname.
- """
- return [self.KeyToFilename(key) for key in self._VALID_KEYS]
+ This can be either used for a 'soft' check (compared to CheckMaster,
+ which exits) or just for computing both at the same time.
+
+ The function does not handle any errors, these should be handled in
+ the caller (errors.ConfigurationError, errors.ResolverError).
+
+ @param ss: either a sstore.SimpleConfigReader or a
+ sstore.SimpleStore instance
+ @rtype: tuple
+ @return: a tuple (master node name, my own name)
+
+ """
+ if ss is None:
+ ss = SimpleStore()
+ return ss.GetMasterNode(), utils.HostInfo().name
+
+
+def CheckMaster(debug, ss=None):
+ """Checks the node setup.
+
+ If this is the master, the function will return. Otherwise it will
+ exit with an exit code based on the node status.
+
+ """
+ try:
+ master_name, myself = GetMasterAndMyself(ss)
+ except errors.ConfigurationError, err:
+ print "Cluster configuration incomplete: '%s'" % str(err)
+ sys.exit(constants.EXIT_NODESETUP_ERROR)
+ except errors.ResolverError, err:
+ sys.stderr.write("Cannot resolve my own name (%s)\n" % err.args[0])
+ sys.exit(constants.EXIT_NODESETUP_ERROR)
+
+ if myself != master_name:
+ if debug:
+ sys.stderr.write("Not master, exiting.\n")
+ sys.exit(constants.EXIT_NOTMASTER)
projects / ganeti-local / blobdiff