bionic (1) hcheck.1.gz

NAME

       hcheck - Cluster checker

SYNOPSIS

       hcheck {backend options...} [algorithm options...] [reporting options...]

       hcheck --version

       Backend options:

       { -m cluster | -L[ path ] |-t** data-file | -I path }

       Algorithm options:

       [  --no-simulation  ]  [  --max-cpu  cpu-ratio ] [ --min-disk disk-ratio ] [ -l limit ] [ -e score ] [ -g
       delta ] [ --min-gain-limit threshold ] [ -O name... ] [ --no-disk-moves ] [ --no-instance-moves  ]  [  -U
       util-file  ]  [ --ignore-dynu ] [ --ignore-soft-errors ] [ --evac-mode ] [ --select-instances inst... ] [
       --exclude-instances inst...  ] [ --no-capacity-checks ]

       Reporting options:

       [--machine-readable[=*CHOICE*] ] [ -p[ fields ] ] [ --print-instances ] [ -v...  | -q ]

DESCRIPTION

       hcheck is the cluster checker.  It prints  information  about  cluster's  health  and  checks  whether  a
       rebalance done using hbal would help.

       This information can be presented in both human-readable and machine-readable way.

       Note that it does not take any action, only performs a rebalance simulation if necessary.

       For more information about the algorithm details check hbal(1).

       Additionally,  hcheck also checks if the cluster is globally N+1 redundant.  That is, it checks for every
       node, if after failing over the DRBD instances all instances on that  node  that  with  disks  externally
       stored can be restarted on some other node.

OPTIONS

       --no-simulation
              Only perform checks based on current cluster state, without trying to simulate rebalancing.

       --no-capacity-checks
              Do  not  check for global N+1 redundancy, i.e., do not warn if the shared-storage instances of one
              node cannot be moved to the others should that node fail.

       For a detailed description about the options listed  above  have  a  look  at  htools(1),  hspace(1)  and
       hbal(1).

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-extstorage-interface(7) (external storage providers).

       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-storage(8)   (storage   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-rapi(8) (remote API daemon).

       Ganeti  htools: htools(1) (generic binary), hbal(1) (cluster balancer), hspace(1) (capacity calculation),
       hail(1) (IAllocator plugin), hscan(1) (data gatherer from remote clusters), hinfo(1) (cluster information
       printer), mon-collector(7) (data collectors interface).

COPYRIGHT

       Copyright (C) 2006-2015 Google Inc.  All rights reserved.

       Redistribution  and  use in source and binary forms, with or without modification, are permitted provided
       that the following conditions are met:

       1.  Redistributions of source code must retain the above copyright notice, this list  of  conditions  and
       the following disclaimer.

       2.  Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
       the following disclaimer in the documentation and/or other materials provided with the distribution.

       THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY  EXPRESS  OR  IMPLIED
       WARRANTIES,  INCLUDING,  BUT  NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
       PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE  FOR
       ANY  DIRECT,  INDIRECT,  INCIDENTAL,  SPECIAL,  EXEMPLARY,  OR  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
       LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF  USE,  DATA,  OR  PROFITS;  OR  BUSINESS
       INTERRUPTION)  HOWEVER  CAUSED  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
       TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE  OF  THIS  SOFTWARE,  EVEN  IF
       ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.