X-Git-Url: https://code.grnet.gr/git/ganeti-local/blobdiff_plain/3ecf6786a731c0a467f0efcbf6346914e3824ec8..48c8887b4355183b3ea4ebb9d9f366358cbdad23:/lib/ssconf.py diff --git a/lib/ssconf.py b/lib/ssconf.py index de9cdbc..78ae9b0 100644 --- a/lib/ssconf.py +++ b/lib/ssconf.py @@ -1,7 +1,7 @@ -#!/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 @@ -26,51 +26,119 @@ configuration data, which is mostly static and available to all nodes. """ -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. @@ -90,103 +158,138 @@ class SimpleStore: 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)