Provided by: ganeti2_2.4.5-1_all bug

Name

       ganeti-watcher - Ganeti cluster watcher

Synopsis

       ganeti-watcher [--debug] [--job-age=age] [--ignore-pause]

DESCRIPTION

       The  ganeti-watcher  is  a  periodically  run  script which is responsible for keeping the
       instances in the correct status. It has two separate functions, one for  the  master  node
       and another one that runs on every node.

       If  the  watcher is disabled at cluster level (via the gnt-cluster watcher pause command),
       it will exit without doing anything. The cluster-level pause can  be  overridden  via  the
       --ignore-pause  option,  for  example  if  during  a  maintenance  the watcher needs to be
       disabled in general, but the administrator wants to run it just once.

       The --debug option will increase the verbosity of the watcher and also activate logging to
       the standard error.

   Master operations
       Its primary function is to try to keep running all instances which are marked as up in the
       configuration file, by trying to start them a limited number of times.

       Another function is to "repair" DRBD links by reactivating the block devices of  instances
       which have secondaries on nodes that have been rebooted.

       The watcher will also archive old jobs (older than the age given via the --job-age option,
       which defaults to 6 hours), in order to keep the job queue manageable.

   Node operations
       The watcher will restart any down daemons that are appropriate for the current node.

       In addition, it will execute any scripts which exist under the "watcher" directory in  the
       Ganeti  hooks  directory (/etc/ganeti/hooks). This should be used for lightweight actions,
       like starting any extra daemons.

       If the cluster parameter maintain_node_health is  enabled,  then  the  watcher  will  also
       shutdown  instances  and  DRBD  devices if the node is declared as offline by known master
       candidates.

       The watcher does synchronous queries but will submit jobs for executing the  changes.  Due
       to locking, it could be that the jobs execute much later than the watcher submits them.

FILES

       The  command  has  a  state file located at /var/lib/ganeti/watcher.data (only used on the
       master) and a log file at /var/log/ganeti/watcher.log.  Removal of either  file  will  not
       affect  correct  operation;  the  removal  of  the  state file will just cause the restart
       counters for the instances to reset to zero.

REPORTING BUGS

       Report  bugs  to  project  website  (http://code.google.com/p/ganeti/)  or   contact   the
       developers using the Ganeti mailing list (ganeti@googlegroups.com).

SEE ALSO

       Ganeti  overview  and specifications: ganeti(7) (general overview), ganeti-os-interface(7)
       (guest OS definitions).

       Ganeti  commands:  gnt-cluster(8)   (cluster-wide   commands),   gnt-job(8)   (job-related
       commands),  gnt-node(8) (node-related commands), gnt-instance(8) (instance commands), gnt-
       os(8) (guest OS commands), gnt-group(8) (node  group  commands),  gnt-backup(8)  (instance
       import/export commands), gnt-debug(8) (debug commands).

       Ganeti  daemons:  ganeti-watcher(8) (automatic instance restarter), ganeti-cleaner(8) (job
       queue cleaner), ganeti-noded(8) (node daemon), ganeti-masterd(8) (master daemon),  ganeti-
       rapi(8) (remote API daemon).

COPYRIGHT

       Copyright  (C)  2006,  2007,  2008,  2009, 2010 Google Inc. Permission is granted to copy,
       distribute and/or modify under the terms of the GNU General Public License as published by
       the  Free  Software  Foundation;  either version 2 of the License, or (at your option) any
       later version.

       On Debian systems, the complete text of the GNU General Public License  can  be  found  in
       /usr/share/common-licenses/GPL.