root / lib / server / masterd.py @ 69cf3abd
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# Copyright (C) 2006, 2007, 2010 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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"""Master daemon program.
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Some classes deviates from the standard style guide since the
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inheritance from parent classes requires it.
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"""
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# pylint: disable-msg=C0103
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# C0103: Invalid name ganeti-masterd
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import grp |
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import os |
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import pwd |
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import sys |
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import socket |
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import time |
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import tempfile |
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import logging |
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from optparse import OptionParser |
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from ganeti import config |
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from ganeti import constants |
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from ganeti import daemon |
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from ganeti import mcpu |
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from ganeti import opcodes |
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from ganeti import jqueue |
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from ganeti import locking |
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from ganeti import luxi |
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from ganeti import utils |
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from ganeti import errors |
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from ganeti import ssconf |
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from ganeti import workerpool |
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from ganeti import rpc |
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from ganeti import bootstrap |
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from ganeti import netutils |
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CLIENT_REQUEST_WORKERS = 16
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EXIT_NOTMASTER = constants.EXIT_NOTMASTER |
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EXIT_NODESETUP_ERROR = constants.EXIT_NODESETUP_ERROR |
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class ClientRequestWorker(workerpool.BaseWorker): |
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# pylint: disable-msg=W0221
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def RunTask(self, server, message, client): |
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"""Process the request.
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"""
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client_ops = ClientOps(server) |
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try:
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(method, args, version) = luxi.ParseRequest(message) |
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except luxi.ProtocolError, err:
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logging.error("Protocol Error: %s", err)
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client.close_log() |
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return
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success = False
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try:
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# Verify client's version if there was one in the request
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if version is not None and version != constants.LUXI_VERSION: |
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raise errors.LuxiError("LUXI version mismatch, server %s, request %s" % |
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(constants.LUXI_VERSION, version)) |
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result = client_ops.handle_request(method, args) |
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success = True
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except errors.GenericError, err:
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logging.exception("Unexpected exception")
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success = False
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result = errors.EncodeException(err) |
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except:
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logging.exception("Unexpected exception")
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err = sys.exc_info() |
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result = "Caught exception: %s" % str(err[1]) |
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try:
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reply = luxi.FormatResponse(success, result) |
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client.send_message(reply) |
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# awake the main thread so that it can write out the data.
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server.awaker.signal() |
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except: # pylint: disable-msg=W0702 |
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logging.exception("Send error")
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client.close_log() |
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class MasterClientHandler(daemon.AsyncTerminatedMessageStream): |
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"""Handler for master peers.
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"""
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_MAX_UNHANDLED = 1
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def __init__(self, server, connected_socket, client_address, family): |
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daemon.AsyncTerminatedMessageStream.__init__(self, connected_socket,
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client_address, |
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constants.LUXI_EOM, |
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family, self._MAX_UNHANDLED)
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self.server = server
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def handle_message(self, message, _): |
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self.server.request_workers.AddTask((self.server, message, self)) |
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class MasterServer(daemon.AsyncStreamServer): |
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"""Master Server.
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This is the main asynchronous master server. It handles connections to the
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master socket.
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"""
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family = socket.AF_UNIX |
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def __init__(self, mainloop, address, uid, gid): |
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"""MasterServer constructor
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@type mainloop: ganeti.daemon.Mainloop
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@param mainloop: Mainloop used to poll for I/O events
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@param address: the unix socket address to bind the MasterServer to
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@param uid: The uid of the owner of the socket
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@param gid: The gid of the owner of the socket
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"""
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temp_name = tempfile.mktemp(dir=os.path.dirname(address)) |
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daemon.AsyncStreamServer.__init__(self, self.family, temp_name) |
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os.chmod(temp_name, 0770)
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os.chown(temp_name, uid, gid) |
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os.rename(temp_name, address) |
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self.mainloop = mainloop
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self.awaker = daemon.AsyncAwaker()
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# We'll only start threads once we've forked.
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self.context = None |
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self.request_workers = None |
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def handle_connection(self, connected_socket, client_address): |
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# TODO: add connection count and limit the number of open connections to a
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# maximum number to avoid breaking for lack of file descriptors or memory.
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MasterClientHandler(self, connected_socket, client_address, self.family) |
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def setup_queue(self): |
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self.context = GanetiContext()
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self.request_workers = workerpool.WorkerPool("ClientReq", |
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CLIENT_REQUEST_WORKERS, |
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ClientRequestWorker) |
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def server_cleanup(self): |
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"""Cleanup the server.
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This involves shutting down the processor threads and the master
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socket.
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"""
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try:
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self.close()
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finally:
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if self.request_workers: |
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self.request_workers.TerminateWorkers()
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if self.context: |
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self.context.jobqueue.Shutdown()
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class ClientOps: |
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"""Class holding high-level client operations."""
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def __init__(self, server): |
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self.server = server
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def handle_request(self, method, args): # pylint: disable-msg=R0911 |
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queue = self.server.context.jobqueue
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# TODO: Parameter validation
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# TODO: Rewrite to not exit in each 'if/elif' branch
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if method == luxi.REQ_SUBMIT_JOB:
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logging.info("Received new job")
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ops = [opcodes.OpCode.LoadOpCode(state) for state in args] |
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return queue.SubmitJob(ops)
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if method == luxi.REQ_SUBMIT_MANY_JOBS:
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logging.info("Received multiple jobs")
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jobs = [] |
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for ops in args: |
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jobs.append([opcodes.OpCode.LoadOpCode(state) for state in ops]) |
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return queue.SubmitManyJobs(jobs)
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elif method == luxi.REQ_CANCEL_JOB:
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job_id = args |
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logging.info("Received job cancel request for %s", job_id)
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return queue.CancelJob(job_id)
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elif method == luxi.REQ_ARCHIVE_JOB:
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job_id = args |
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logging.info("Received job archive request for %s", job_id)
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return queue.ArchiveJob(job_id)
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elif method == luxi.REQ_AUTOARCHIVE_JOBS:
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(age, timeout) = args |
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logging.info("Received job autoarchive request for age %s, timeout %s",
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age, timeout) |
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return queue.AutoArchiveJobs(age, timeout)
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elif method == luxi.REQ_WAIT_FOR_JOB_CHANGE:
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(job_id, fields, prev_job_info, prev_log_serial, timeout) = args |
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logging.info("Received job poll request for %s", job_id)
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return queue.WaitForJobChanges(job_id, fields, prev_job_info,
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prev_log_serial, timeout) |
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elif method == luxi.REQ_QUERY_JOBS:
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(job_ids, fields) = args |
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if isinstance(job_ids, (tuple, list)) and job_ids: |
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msg = utils.CommaJoin(job_ids) |
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else:
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msg = str(job_ids)
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logging.info("Received job query request for %s", msg)
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return queue.QueryJobs(job_ids, fields)
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elif method == luxi.REQ_QUERY_INSTANCES:
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(names, fields, use_locking) = args |
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logging.info("Received instance query request for %s", names)
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if use_locking:
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raise errors.OpPrereqError("Sync queries are not allowed", |
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errors.ECODE_INVAL) |
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op = opcodes.OpQueryInstances(names=names, output_fields=fields, |
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use_locking=use_locking) |
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return self._Query(op) |
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elif method == luxi.REQ_QUERY_NODES:
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(names, fields, use_locking) = args |
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logging.info("Received node query request for %s", names)
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if use_locking:
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raise errors.OpPrereqError("Sync queries are not allowed", |
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errors.ECODE_INVAL) |
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op = opcodes.OpQueryNodes(names=names, output_fields=fields, |
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use_locking=use_locking) |
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return self._Query(op) |
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elif method == luxi.REQ_QUERY_EXPORTS:
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nodes, use_locking = args |
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if use_locking:
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raise errors.OpPrereqError("Sync queries are not allowed", |
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errors.ECODE_INVAL) |
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logging.info("Received exports query request")
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op = opcodes.OpQueryExports(nodes=nodes, use_locking=use_locking) |
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return self._Query(op) |
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elif method == luxi.REQ_QUERY_CONFIG_VALUES:
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fields = args |
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logging.info("Received config values query request for %s", fields)
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op = opcodes.OpQueryConfigValues(output_fields=fields) |
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return self._Query(op) |
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elif method == luxi.REQ_QUERY_CLUSTER_INFO:
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logging.info("Received cluster info query request")
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op = opcodes.OpQueryClusterInfo() |
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return self._Query(op) |
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elif method == luxi.REQ_QUERY_TAGS:
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kind, name = args |
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logging.info("Received tags query request")
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op = opcodes.OpGetTags(kind=kind, name=name) |
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return self._Query(op) |
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elif method == luxi.REQ_QUERY_LOCKS:
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(fields, sync) = args |
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logging.info("Received locks query request")
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return self.server.context.glm.QueryLocks(fields, sync) |
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elif method == luxi.REQ_QUEUE_SET_DRAIN_FLAG:
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drain_flag = args |
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logging.info("Received queue drain flag change request to %s",
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drain_flag) |
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return queue.SetDrainFlag(drain_flag)
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elif method == luxi.REQ_SET_WATCHER_PAUSE:
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(until, ) = args |
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if until is None: |
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logging.info("Received request to no longer pause the watcher")
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else:
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if not isinstance(until, (int, float)): |
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raise TypeError("Duration must be an integer or float") |
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if until < time.time():
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raise errors.GenericError("Unable to set pause end time in the past") |
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logging.info("Received request to pause the watcher until %s", until)
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return _SetWatcherPause(until)
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else:
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logging.info("Received invalid request '%s'", method)
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raise ValueError("Invalid operation '%s'" % method) |
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def _Query(self, op): |
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"""Runs the specified opcode and returns the result.
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"""
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# Queries don't have a job id
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proc = mcpu.Processor(self.server.context, None) |
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# TODO: Executing an opcode using locks will acquire them in blocking mode.
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# Consider using a timeout for retries.
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return proc.ExecOpCode(op, None) |
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class GanetiContext(object): |
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"""Context common to all ganeti threads.
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This class creates and holds common objects shared by all threads.
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"""
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# pylint: disable-msg=W0212
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# we do want to ensure a singleton here
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_instance = None
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def __init__(self): |
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"""Constructs a new GanetiContext object.
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There should be only a GanetiContext object at any time, so this
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function raises an error if this is not the case.
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"""
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assert self.__class__._instance is None, "double GanetiContext instance" |
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# Create global configuration object
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self.cfg = config.ConfigWriter()
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# Locking manager
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self.glm = locking.GanetiLockManager(
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self.cfg.GetNodeList(),
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self.cfg.GetInstanceList())
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# Job queue
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self.jobqueue = jqueue.JobQueue(self) |
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# setting this also locks the class against attribute modifications
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self.__class__._instance = self |
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def __setattr__(self, name, value): |
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"""Setting GanetiContext attributes is forbidden after initialization.
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"""
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assert self.__class__._instance is None, "Attempt to modify Ganeti Context" |
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object.__setattr__(self, name, value) |
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def AddNode(self, node, ec_id): |
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"""Adds a node to the configuration and lock manager.
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"""
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# Add it to the configuration
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self.cfg.AddNode(node, ec_id)
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# If preseeding fails it'll not be added
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self.jobqueue.AddNode(node)
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# Add the new node to the Ganeti Lock Manager
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self.glm.add(locking.LEVEL_NODE, node.name)
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def ReaddNode(self, node): |
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"""Updates a node that's already in the configuration
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"""
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# Synchronize the queue again
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self.jobqueue.AddNode(node)
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def RemoveNode(self, name): |
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"""Removes a node from the configuration and lock manager.
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"""
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# Remove node from configuration
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self.cfg.RemoveNode(name)
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# Notify job queue
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self.jobqueue.RemoveNode(name)
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# Remove the node from the Ganeti Lock Manager
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self.glm.remove(locking.LEVEL_NODE, name)
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def _SetWatcherPause(until): |
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"""Creates or removes the watcher pause file.
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@type until: None or int
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@param until: Unix timestamp saying until when the watcher shouldn't run
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"""
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if until is None: |
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utils.RemoveFile(constants.WATCHER_PAUSEFILE) |
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else:
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utils.WriteFile(constants.WATCHER_PAUSEFILE, |
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data="%d\n" % (until, ))
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return until
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@rpc.RunWithRPC
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def CheckAgreement(): |
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"""Check the agreement on who is the master.
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The function uses a very simple algorithm: we must get more positive
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than negative answers. Since in most of the cases we are the master,
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we'll use our own config file for getting the node list. In the
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future we could collect the current node list from our (possibly
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obsolete) known nodes.
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In order to account for cold-start of all nodes, we retry for up to
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a minute until we get a real answer as the top-voted one. If the
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nodes are more out-of-sync, for now manual startup of the master
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should be attempted.
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Note that for a even number of nodes cluster, we need at least half
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of the nodes (beside ourselves) to vote for us. This creates a
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problem on two-node clusters, since in this case we require the
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other node to be up too to confirm our status.
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"""
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myself = netutils.Hostname.GetSysName() |
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#temp instantiation of a config writer, used only to get the node list
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cfg = config.ConfigWriter() |
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node_list = cfg.GetNodeList() |
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del cfg
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retries = 6
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while retries > 0: |
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votes = bootstrap.GatherMasterVotes(node_list) |
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if not votes: |
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# empty node list, this is a one node cluster
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return True |
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if votes[0][0] is None: |
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retries -= 1
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time.sleep(10)
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continue
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break
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if retries == 0: |
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logging.critical("Cluster inconsistent, most of the nodes didn't answer"
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" after multiple retries. Aborting startup")
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logging.critical("Use the --no-voting option if you understand what"
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" effects it has on the cluster state")
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return False |
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# here a real node is at the top of the list
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all_votes = sum(item[1] for item in votes) |
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top_node, top_votes = votes[0]
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result = False
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if top_node != myself:
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logging.critical("It seems we are not the master (top-voted node"
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" is %s with %d out of %d votes)", top_node, top_votes,
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all_votes) |
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elif top_votes < all_votes - top_votes:
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logging.critical("It seems we are not the master (%d votes for,"
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" %d votes against)", top_votes, all_votes - top_votes)
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else:
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result = True
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return result
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@rpc.RunWithRPC
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def ActivateMasterIP(): |
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# activate ip
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master_node = ssconf.SimpleStore().GetMasterNode() |
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result = rpc.RpcRunner.call_node_start_master(master_node, False, False) |
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msg = result.fail_msg |
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if msg:
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logging.error("Can't activate master IP address: %s", msg)
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def CheckMasterd(options, args): |
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"""Initial checks whether to run or exit with a failure.
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"""
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if args: # masterd doesn't take any arguments |
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print >> sys.stderr, ("Usage: %s [-f] [-d]" % sys.argv[0]) |
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sys.exit(constants.EXIT_FAILURE) |
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ssconf.CheckMaster(options.debug) |
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try:
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options.uid = pwd.getpwnam(constants.MASTERD_USER).pw_uid |
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options.gid = grp.getgrnam(constants.DAEMONS_GROUP).gr_gid |
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except KeyError: |
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print >> sys.stderr, ("User or group not existing on system: %s:%s" % |
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(constants.MASTERD_USER, constants.DAEMONS_GROUP)) |
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sys.exit(constants.EXIT_FAILURE) |
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# Check the configuration is sane before anything else
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try:
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config.ConfigWriter() |
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except errors.ConfigVersionMismatch, err:
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v1 = "%s.%s.%s" % constants.SplitVersion(err.args[0]) |
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v2 = "%s.%s.%s" % constants.SplitVersion(err.args[1]) |
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print >> sys.stderr, \
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("Configuration version mismatch. The current Ganeti software"
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" expects version %s, but the on-disk configuration file has"
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" version %s. This is likely the result of upgrading the"
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" software without running the upgrade procedure. Please contact"
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" your cluster administrator or complete the upgrade using the"
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" cfgupgrade utility, after reading the upgrade notes." %
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(v1, v2)) |
521 |
sys.exit(constants.EXIT_FAILURE) |
522 |
except errors.ConfigurationError, err:
|
523 |
print >> sys.stderr, \
|
524 |
("Configuration error while opening the configuration file: %s\n"
|
525 |
"This might be caused by an incomplete software upgrade or"
|
526 |
" by a corrupted configuration file. Until the problem is fixed"
|
527 |
" the master daemon cannot start." % str(err)) |
528 |
sys.exit(constants.EXIT_FAILURE) |
529 |
|
530 |
# If CheckMaster didn't fail we believe we are the master, but we have to
|
531 |
# confirm with the other nodes.
|
532 |
if options.no_voting:
|
533 |
if options.yes_do_it:
|
534 |
return
|
535 |
|
536 |
sys.stdout.write("The 'no voting' option has been selected.\n")
|
537 |
sys.stdout.write("This is dangerous, please confirm by"
|
538 |
" typing uppercase 'yes': ")
|
539 |
sys.stdout.flush() |
540 |
|
541 |
confirmation = sys.stdin.readline().strip() |
542 |
if confirmation != "YES": |
543 |
print >> sys.stderr, "Aborting." |
544 |
sys.exit(constants.EXIT_FAILURE) |
545 |
|
546 |
return
|
547 |
|
548 |
# CheckAgreement uses RPC and threads, hence it needs to be run in a separate
|
549 |
# process before we call utils.Daemonize in the current process.
|
550 |
if not utils.RunInSeparateProcess(CheckAgreement): |
551 |
sys.exit(constants.EXIT_FAILURE) |
552 |
|
553 |
# ActivateMasterIP also uses RPC/threads, so we run it again via a
|
554 |
# separate process.
|
555 |
|
556 |
# TODO: decide whether failure to activate the master IP is a fatal error
|
557 |
utils.RunInSeparateProcess(ActivateMasterIP) |
558 |
|
559 |
|
560 |
def PrepMasterd(options, _): |
561 |
"""Prep master daemon function, executed with the PID file held.
|
562 |
|
563 |
"""
|
564 |
# This is safe to do as the pid file guarantees against
|
565 |
# concurrent execution.
|
566 |
utils.RemoveFile(constants.MASTER_SOCKET) |
567 |
|
568 |
mainloop = daemon.Mainloop() |
569 |
master = MasterServer(mainloop, constants.MASTER_SOCKET, |
570 |
options.uid, options.gid) |
571 |
return (mainloop, master)
|
572 |
|
573 |
|
574 |
def ExecMasterd(options, args, prep_data): # pylint: disable-msg=W0613 |
575 |
"""Main master daemon function, executed with the PID file held.
|
576 |
|
577 |
"""
|
578 |
(mainloop, master) = prep_data |
579 |
try:
|
580 |
rpc.Init() |
581 |
try:
|
582 |
master.setup_queue() |
583 |
try:
|
584 |
mainloop.Run() |
585 |
finally:
|
586 |
master.server_cleanup() |
587 |
finally:
|
588 |
rpc.Shutdown() |
589 |
finally:
|
590 |
utils.RemoveFile(constants.MASTER_SOCKET) |
591 |
|
592 |
|
593 |
def Main(): |
594 |
"""Main function"""
|
595 |
parser = OptionParser(description="Ganeti master daemon",
|
596 |
usage="%prog [-f] [-d]",
|
597 |
version="%%prog (ganeti) %s" %
|
598 |
constants.RELEASE_VERSION) |
599 |
parser.add_option("--no-voting", dest="no_voting", |
600 |
help="Do not check that the nodes agree on this node"
|
601 |
" being the master and start the daemon unconditionally",
|
602 |
default=False, action="store_true") |
603 |
parser.add_option("--yes-do-it", dest="yes_do_it", |
604 |
help="Override interactive check for --no-voting",
|
605 |
default=False, action="store_true") |
606 |
daemon.GenericMain(constants.MASTERD, parser, CheckMasterd, PrepMasterd, |
607 |
ExecMasterd, multithreaded=True)
|