Provided by: ganeti-2.15_2.15.2-3_all bug

Name

       gnt-cluster - Ganeti administration, cluster-wide

Synopsis

       gnt-cluster {command} [arguments...]

DESCRIPTION

       The gnt-cluster is used for cluster-wide administration in the Ganeti system.

COMMANDS

   ACTIVATE-MASTER-IP
       activate-master-ip

       Activates the master IP on the master node.

   COMMAND
       command [-n node] [-g group] [-M] {command}

       Executes  a  command  on  all nodes.  This command is designed for simple usage.  For more
       complex use cases the commands dsh(1) or cssh(1) should be used instead.

       If the option -n is not given, the command will be executed on  all  nodes,  otherwise  it
       will be executed only on the node(s) specified.  Use the option multiple times for running
       it on multiple nodes, like:

              # gnt-cluster command -n node1.example.com -n node2.example.com date

       The -g option can be used to run a command only on a specific node group, e.g.:

              # gnt-cluster command -g default date

       The -M  option  can  be  used  to  prepend  the  node  name  to  all  output  lines.   The
       --failure-only option hides successful commands, making it easier to see failures.

       The  command is executed serially on the selected nodes.  If the master node is present in
       the list, the command will be executed last on the master.  Regarding the other nodes, the
       execution  order  is  somewhat  alphabetic, so that node2.example.com will be earlier than
       node10.example.com but after node1.example.com.

       So given the node names node1, node2, node3, node10, node11, with node3 being the  master,
       the order will be: node1, node2, node10, node11, node3.

       The  command  is  constructed  by  concatenating  all  other  command line arguments.  For
       example, to list the contents of the /etc directory on all nodes, run:

              # gnt-cluster command ls -l /etc

       and the command which will be executed will be ls -l /etc.

   COPYFILE
       copyfile [--use-replication-network] [-n node] [-g group]
       {file}

       Copies a file to all or to some nodes.  The argument specifies the  source  file  (on  the
       current  system),  the  -n  argument  specifies the target node, or nodes if the option is
       given multiple times.  If -n is not given at all, the file will be copied  to  all  nodes.
       The  -g  option  can  be  used to only select nodes in a specific node group.  Passing the
       --use-replication-network option will cause the copy  to  be  done  over  the  replication
       network (only matters if the primary/secondary IPs are different).  Example:

              # gnt-cluster copyfile -n node1.example.com -n node2.example.com /tmp/test

       This will copy the file /tmp/test from the current node to the two named nodes.

   DEACTIVATE-MASTER-IP
       deactivate-master-ip [--yes]

       Deactivates the master IP on the master node.

       This  should  be  run  only  locally  or  on  a  connection  to the node ip directly, as a
       connection to the master ip will be broken by this operation.  Because  of  this  risk  it
       will require user confirmation unless the --yes option is passed.

   DESTROY
       destroy {--yes-do-it}

       Remove  all  configuration files related to the cluster, so that a gnt-cluster init can be
       done again afterwards.

       Since this is a dangerous command, you are required to pass the argument --yes-do-it.

   EPO
       epo [--on] [--groups|--all] [--power-delay] arguments

       Performs an emergency power-off on nodes  given  as  arguments.   If  --groups  is  given,
       arguments are node groups.  If --all is provided, the whole cluster will be shut down.

       The  --on  flag  recovers  the cluster after an emergency power-off.  When powering on the
       cluster you can use --power-delay to define the time in seconds (fractions allowed) waited
       between powering on individual nodes.

       Please  note  that  the  master node will not be turned down or up automatically.  It will
       just be left in a state, where you can manully perform the shutdown of that one node.   If
       the  master  is in the list of affected nodes and this is not a complete cluster emergency
       power-off (e.g.  using --all), you're required to do a master failover to another node not
       affected.

   GETMASTER
       getmaster

       Displays the current master node.

   INFO
       info [--roman]

       Shows runtime cluster information: cluster name, architecture (32 or 64 bit), master node,
       node list and instance list.

       Passing the --roman option gnt-cluster info will try to print  its  integer  fields  in  a
       latin friendly way.  This allows further diffusion of Ganeti among ancient cultures.

   SHOW-ISPECS-CMD
       show-ispecs-cmd

       Shows  the  command  line  that  can be used to recreate the cluster with the same options
       relative to specs in the instance policies.

   INIT
       init
       [{-s|--secondary-ip} secondary_ip]
       [--vg-name vg-name]
       [--master-netdev interface-name]
       [--master-netmask netmask]
       [--use-external-mip-script {yes | no}]
       [{-m|--mac-prefix} mac-prefix]
       [--no-etc-hosts]
       [--no-ssh-init]
       [--file-storage-dir dir]
       [--shared-file-storage-dir dir]
       [--gluster-storage-dir dir]
       [--enabled-hypervisors hypervisors]
       [{-H|--hypervisor-parameters} hypervisor:hv-param=*value*[,*hv-param*=*value*...]]
       [{-B|--backend-parameters} be-param=*value*[,*be-param*=*value*...]]
       [{-N|--nic-parameters} nic-param=*value*[,*nic-param*=*value*...]]
       [{-D|--disk-parameters} disk-template:disk-param=*value*[,*disk-param*=*value*...]]
       [--maintain-node-health {yes | no}]
       [--uid-pool user-id pool definition]
       [{-I|--default-iallocator} default instance allocator]
       [--default-iallocator-params ial-param=*value*,*ial-param*=*value*]
       [--primary-ip-version version]
       [--prealloc-wipe-disks {yes | no}]
       [--node-parameters ndparams]
       [{-C|--candidate-pool-size} candidate_pool_size]
       [--specs-cpu-count spec-param=*value* [,*spec-param*=*value*...]]
       [--specs-disk-count spec-param=*value* [,*spec-param*=*value*...]]
       [--specs-disk-size spec-param=*value* [,*spec-param*=*value*...]]
       [--specs-mem-size spec-param=*value* [,*spec-param*=*value*...]]
       [--specs-nic-count spec-param=*value* [,*spec-param*=*value*...]]
       [--ipolicy-std-specs spec=*value* [,*spec*=*value*...]]
       [--ipolicy-bounds-specs bounds_ispecs]
       [--ipolicy-disk-templates template [,*template*...]]
       [--ipolicy-spindle-ratio ratio]
       [--ipolicy-vcpu-ratio ratio]
       [--disk-state diskstate]
       [--hypervisor-state hvstate]
       [--drbd-usermode-helper helper]
       [--enabled-disk-templates template [,*template*...]]
       [--install-image image]
       [--zeroing-image image]
       [--compression-tools [tool, [tool]]]
       [--user-shutdown {yes | no}]
       {clustername}

       This commands is only run once initially on the  first  node  of  the  cluster.   It  will
       initialize  the cluster configuration, setup the ssh-keys, start the daemons on the master
       node, etc.  in order to have a working one-node cluster.

       Note that the clustername is not any random name.  It  has  to  be  resolvable  to  an  IP
       address  using  DNS,  and  it  is  best if you give the fully-qualified domain name.  This
       hostname must resolve to an IP address reserved exclusively for this  purpose,  i.e.   not
       already in use.

       The  cluster  can  run  in  two  modes: single-home or dual-homed.  In the first case, all
       traffic (both public traffic, inter-node traffic and data replication traffic)  goes  over
       the  same  interface.   In the dual-homed case, the data replication traffic goes over the
       second network.  The -s (--secondary-ip) option here marks the cluster as  dual-homed  and
       its parameter represents this node's address on the second network.  If you initialise the
       cluster with -s, all nodes added must have a secondary IP as well.

       Note that for Ganeti it doesn't matter if the secondary network  is  actually  a  separate
       physical  network,  or  is  done  using  tunneling,  etc.   For  performance reasons, it's
       recommended to use a separate network, of course.

       The --vg-name option will let you specify a volume group different than "xenvg" for Ganeti
       to  use  when  creating  instance disks.  This volume group must have the same name on all
       nodes.  Once the cluster is initialized this can be altered by using the  modify  command.
       Note that if the volume group name is modified after the cluster creation and DRBD support
       is enabled you might have to manually modify the metavg as well.

       If you don't want to use lvm storage at all use  the  --enabled-disk-templates  option  to
       restrict  the  set  of  enabled  disk  templates.  Once the cluster is initialized you can
       change this setup with the modify command.

       The --master-netdev option is useful for specifying a different  interface  on  which  the
       master  will  activate  its IP address.  It's important that all nodes have this interface
       because you'll need it for a master failover.

       The --master-netmask option allows to specify a netmask for the master  IP.   The  netmask
       must  be  specified as an integer, and will be interpreted as a CIDR netmask.  The default
       value is 32 for an IPv4 address and 128 for an IPv6 address.

       The --use-external-mip-script option allows to specify whether  to  use  an  user-supplied
       master IP address setup script, whose location is /etc/ganeti/scripts/master-ip-setup.  If
       the   option   value   is   set   to   False,   the    default    script    (located    at
       /usr/lib/ganeti/tools/master-ip-setup) will be executed.

       The  -m (--mac-prefix)  option  will  let  you specify a three byte prefix under which the
       virtual MAC addresses of your instances will be generated.  The prefix must  be  specified
       in the format XX:XX:XX and the default is aa:00:00.

       The  --no-etc-hosts  option  allows  you  to  initialize the cluster without modifying the
       /etc/hosts file.

       The --no-ssh-init option  allows  you  to  initialize  the  cluster  without  creating  or
       distributing SSH key pairs.

       The  --file-storage-dir, --shared-file-storage-dir and --gluster-storage-dir options allow
       you set the directory to use for storing the instance disk files when  using  respectively
       the file storage backend, the shared file storage backend and the gluster storage backend.
       Note that these directories  must  be  an  allowed  directory  for  file  storage.   Those
       directories  are  specified  in the /etc/ganeti/file-storage-paths file.  The file storage
       directory can also be a subdirectory of an allowed one.  The file storage directory should
       be present on all nodes.

       The  --prealloc-wipe-disks  sets a cluster wide configuration value for wiping disks prior
       to allocation and size  changes  (gnt-instance grow-disk).   This  increases  security  on
       instance level as the instance can't access untouched data from its underlying storage.

       The  --enabled-hypervisors  option  allows you to set the list of hypervisors that will be
       enabled for this cluster.  Instance hypervisors can  only  be  chosen  from  the  list  of
       enabled hypervisors, and the first entry of this list will be used by default.  Currently,
       the following hypervisors are available:

       xen-pvm
              Xen PVM hypervisor

       xen-hvm
              Xen HVM hypervisor

       kvm    Linux KVM hypervisor

       chroot a simple chroot manager that starts chroot based on a script at  the  root  of  the
              filesystem holding the chroot

       fake   fake hypervisor for development/testing

       Either  a  single  hypervisor  name  or  a comma-separated list of hypervisor names can be
       specified.  If this option is not specified, only the xen-pvm  hypervisor  is  enabled  by
       default.

       The  --user-shutdown  option  enables  or  disables user shutdown detection at the cluster
       level.  User shutdown detection allows users to initiate instance poweroff from inside the
       instance,  and  Ganeti  will  report  the  instance  status as 'USER_down' (as opposed, to
       'ERROR_down') and the watcher will not restart  these  instances,  thus  preserving  their
       instance  status.   This option is disabled by default.  For KVM, the hypervisor parameter
       user_shutdown must also be set, either at the cluster level or  on  a  per-instance  basis
       (see gnt-instance(8)).

       The  -H (--hypervisor-parameters)  option  allows  you  to set default hypervisor specific
       parameters for the cluster.  The format of this option is  the  name  of  the  hypervisor,
       followed by a colon and a comma-separated list of key=value pairs.  The keys available for
       each hypervisors are detailed in the gnt-instance(8) man page, in the add command plus the
       following parameters which are only configurable globally (at cluster level):

       migration_port
              Valid for the Xen PVM and KVM hypervisors.

              This  options  specifies  the  TCP port to use for live-migration when using the xm
              toolstack.   The  same  port  should  be   configured   on   all   nodes   in   the
              /etc/xen/xend-config.sxp file, under the key "xend-relocation-port".

       migration_bandwidth
              Valid for the KVM hypervisor.

              This  option  specifies  the  maximum bandwidth that KVM will use for instance live
              migrations.  The value is in MiB/s.

              This option is only effective with kvm versions >=  78  and  qemu-kvm  versions  >=
              0.10.0.

       The  -B (--backend-parameters) option allows you to set the default backend parameters for
       the cluster.  The parameter format is a comma-separated list of key=value pairs  with  the
       following supported keys:

       vcpus  Number  of VCPUs to set for an instance by default, must be an integer, will be set
              to 1 if no specified.

       maxmem Maximum amount of memory to allocate for an instance by default, can be  either  an
              integer  or  an integer followed by a unit (M for mebibytes and G for gibibytes are
              supported), will be set to 128M if not specified.

       minmem Minimum amount of memory to allocate for an instance by default, can be  either  an
              integer  or  an integer followed by a unit (M for mebibytes and G for gibibytes are
              supported), will be set to 128M if not specified.

       auto_balance
              Value of the auto_balance flag for instances to use by default, will be set to true
              if not specified.

       always_failover
              Default  value  for  the  always_failover  flag for instances; if not set, False is
              used.

       The  -N (--nic-parameters)  option  allows  you  to  set  the  default  network  interface
       parameters  for  the cluster.  The parameter format is a comma-separated list of key=value
       pairs with the following supported keys:

       mode   The default NIC mode, one of routed, bridged or openvswitch.

       link   In bridged or openvswitch mode the default interface  where  to  attach  NICs.   In
              routed  mode  it  represents  an  hypervisor-vif-script  dependent  value  to allow
              different instance groups.  For example under the KVM default network script it  is
              interpreted  as  a  routing  table  number  or  name.   Openvswitch support is also
              hypervisor dependent and currently works for the default KVM network script.  Under
              Xen a custom network script must be provided.

       The  -D (--disk-parameters)  option allows you to set the default disk template parameters
       at cluster level.  The format used for this option is similar to the one  use  by  the  -H
       option:  the  disk  template  name  must  be specified first, followed by a colon and by a
       comma-separated list of key-value pairs.   These  parameters  can  only  be  specified  at
       cluster  and node group level; the cluster-level parameter are inherited by the node group
       at the moment of its creation, and can be further modified at node group level  using  the
       gnt-group(8) command.

       The  following  is  the  list  of  disk  parameters  available for the drbd template, with
       measurement units specified in square  brackets  at  the  end  of  the  description  (when
       applicable):

       resync-rate
              Static re-synchronization rate.  [KiB/s]

       data-stripes
              Number of stripes to use for data LVs.

       meta-stripes
              Number of stripes to use for meta LVs.

       disk-barriers
              What  kind  of  barriers to disable for disks.  It can either assume the value "n",
              meaning no barrier disabled, or a non-empty  string  containing  a  subset  of  the
              characters "bfd".  "b" means disable disk barriers, "f" means disable disk flushes,
              "d" disables disk drains.

       meta-barriers
              Boolean value indicating whether the meta barriers should be disabled (True) or not
              (False).

       metavg String  containing  the name of the default LVM volume group for DRBD metadata.  By
              default, it is set to xenvg.  It can be overridden  during  the  instance  creation
              process by using the metavg key of the --disk parameter.

       disk-custom
              String  containing  additional  parameters  to be appended to the arguments list of
              drbdsetup disk.

       net-custom
              String containing additional parameters to be appended to  the  arguments  list  of
              drbdsetup net.

       protocol
              Replication protocol for the DRBD device.  Has to be either "A", "B" or "C".  Refer
              to the DRBD documentation for further information about the differences between the
              protocols.

       dynamic-resync
              Boolean  indicating  whether to use the dynamic resync speed controller or not.  If
              enabled, c-plan-ahead must be non-zero and all the c-* parameters will be  used  by
              DRBD.  Otherwise, the value of resync-rate will be used as a static resync speed.

       c-plan-ahead
              Agility factor of the dynamic resync speed controller.  (the higher, the slower the
              algorithm will adapt the resync speed).   A  value  of  0  (that  is  the  default)
              disables the controller.  [ds]

       c-fill-target
              Maximum  amount  of  in-flight resync data for the dynamic resync speed controller.
              [sectors]

       c-delay-target
              Maximum estimated peer response latency for the dynamic  resync  speed  controller.
              [ds]

       c-min-rate
              Minimum resync speed for the dynamic resync speed controller.  [KiB/s]

       c-max-rate
              Upper bound on resync speed for the dynamic resync speed controller.  [KiB/s]

       List of parameters available for the plain template:

       stripes
              Number of stripes to use for new LVs.

       List of parameters available for the rbd template:

       pool   The RADOS cluster pool, inside which all rbd volumes will reside.  When a new RADOS
              cluster is deployed,  the  default  pool  to  put  rbd  volumes  (Images  in  RADOS
              terminology) is 'rbd'.

       access If  'userspace', instances will access their disks directly without going through a
              block device, avoiding  expensive  context  switches  with  kernel  space  and  the
              potential   for   deadlocks  (http://tracker.ceph.com/issues/3076)  in  low  memory
              scenarios.

              The default value is 'kernelspace' and it disables this  behaviour.   This  setting
              may  only  be changed to 'userspace' if all instance disks in the affected group or
              cluster can be accessed in userspace.

              Attempts to use this feature without rbd support compiled in KVM result  in  a  "no
              such file or directory" error messages.

       The  option  --maintain-node-health  allows  one  to  enable/disable automatic maintenance
       actions  on  nodes.   Currently  these  include  automatic  shutdown  of   instances   and
       deactivation  of  DRBD  devices  on  offline  nodes; in the future it might be extended to
       automatic removal of unknown LVM volumes, etc.  Note that this option is  only  useful  if
       the use of ganeti-confd was enabled at compilation.

       The  --uid-pool  option  initializes  the  user-id  pool.  The user-id pool definition can
       contain a list of user-ids and/or a list of user-id ranges.  The  parameter  format  is  a
       comma-separated  list  of numeric user-ids or user-id ranges.  The ranges are defined by a
       lower and higher boundary, separated by a dash.  The boundaries  are  inclusive.   If  the
       --uid-pool  option  is not supplied, the user-id pool is initialized to an empty list.  An
       empty list means that the user-id pool feature is disabled.

       The -I (--default-iallocator)  option  specifies  the  default  instance  allocator.   The
       instance  allocator  will be used for operations like instance creation, instance and node
       migration, etc.  when no manual override is specified.  If this option  is  not  specified
       and  htools  was  not enabled at build time, the default instance allocator will be blank,
       which means that relevant operations will require the administrator  to  manually  specify
       either  an  instance  allocator,  or  a  set of nodes.  If the option is not specified but
       htools was enabled, the default iallocator will be hail(1) (assuming it can  be  found  on
       disk).  The default iallocator can be changed later using the modify command.

       The option --default-iallocator-params sets the cluster-wide iallocator parameters used by
       the default iallocator only on instance allocations.

       The --primary-ip-version option specifies the IP version used  for  the  primary  address.
       Possible  values  are  4  and 6 for IPv4 and IPv6, respectively.  This option is used when
       resolving node names and the cluster name.

       The --node-parameters option allows you to set default node parameters  for  the  cluster.
       Please see ganeti(7) for more information about supported key=value pairs.

       The -C (--candidate-pool-size) option specifies the candidate_pool_size cluster parameter.
       This is the number of nodes that the master will try to keep  as  master_candidates.   For
       more details about this role and other node roles, see the ganeti(7).

       The --specs-... and --ipolicy-... options specify the instance policy on the cluster.  The
       --ipolicy-bounds-specs option sets the minimum and maximum specifications  for  instances.
       The  format  is:  min:param=*value*,.../max:param=*value*,...   and further specifications
       pairs can be added by using // as a separator.  The  --ipolicy-std-specs  option  takes  a
       list of parameter/value pairs.  For both options, param can be:

       · cpu-count: number of VCPUs for an instance

       · disk-count: number of disk for an instance

       · disk-size: size of each disk

       · memory-size: instance memory

       · nic-count: number of network interface

       · spindle-use: spindle usage for an instance

       For  the  --specs-...  options, each option can have three values: min, max and std, which
       can also be modified on group level (except for std, which is defined once for the  entire
       cluster).   Please  note,  that std values are not the same as defaults set by --beparams,
       but they are used for the capacity calculations.

       · --specs-cpu-count limits the number of VCPUs that can be used by an instance.

       · --specs-disk-count limits the number of disks

       · --specs-disk-size limits the disk size for every disk used

       · --specs-mem-size limits the amount of memory available

       · --specs-nic-count sets limits on the number of NICs used

       The --ipolicy-spindle-ratio option takes a decimal number.   The  --ipolicy-disk-templates
       option  takes  a comma-separated list of disk templates.  This list of disk templates must
       be a subset of the list of cluster-wide enabled disk templates  (which  can  be  set  with
       --enabled-disk-templates).

       · --ipolicy-spindle-ratio limits the instances-spindles ratio

       · --ipolicy-vcpu-ratio limits the vcpu-cpu ratio

       All  the instance policy elements can be overridden at group level.  Group level overrides
       can be removed by specifying default as the value of an item.

       The --drbd-usermode-helper option can be used to specify a usermode  helper.   Check  that
       this string is the one used by the DRBD kernel.

       For details about how to use --hypervisor-state and --disk-state have a look at ganeti(7).

       The --enabled-disk-templates option specifies a list of disk templates that can be used by
       instances of the cluster.  For the possible values  in  this  list,  see  gnt-instance(8).
       Note  that  in  contrast to the list of disk templates in the ipolicy, this list is a hard
       restriction.  It is not possible to create instances with  disk  templates  that  are  not
       enabled in the cluster.  It is also not possible to disable a disk template when there are
       still instances using it.  The first disk template in the list of enabled disk template is
       the  default disk template.  It will be used for instance creation, if no disk template is
       requested explicitely.

       The --install-image option specifies the location of the OS image to use  to  run  the  OS
       scripts  inside a virtualized environment.  This can be a file path or a URL.  In the case
       that a file path is used, nodes are expected to have the  install  image  located  at  the
       given  path,  although  that  is  enforced during a instance create with unsafe OS scripts
       operation only.

       The --zeroing-image option specifies the location of the OS image to use to zero  out  the
       free  space  of  an  instance.  This can be a file path or a URL.  In the case that a file
       path is used, nodes are expected to have the zeroing image  located  at  the  given  path,
       although that is enforced during a zeroing operation only.

       The  --compression-tools  option specifies the tools that can be used to compress the disk
       data  of  instances  in  transfer.   The  default  tools  are:  'gzip',  'gzip-slow',  and
       'gzip-fast'.   For compatibility reasons, the 'gzip' tool cannot be excluded from the list
       of compression tools.  Ganeti knows how to use certain tools, but does not provide them as
       a  default  as  they  are  not  commonly  present: currently only 'lzop'.  The user should
       indicate their presence by specifying them through this option.   Any  other  custom  tool
       specified  must  have  a simple executable name ('[-_a-zA-Z0-9]+'), accept input on stdin,
       and produce output on stdout.  The '-d' flag  specifies  that  decompression  rather  than
       compression  is  taking  place.   The  '-h'  flag  must be supported as a means of testing
       whether the executable exists.  These requirements are compatible with  the  gzip  command
       line options, allowing many tools to be easily wrapped and used.

   MASTER-FAILOVER
       master-failover [--no-voting] [--yes-do-it]

       Failover the master role to the current node.

       The  --no-voting  option  skips  the remote node agreement checks.  This is dangerous, but
       necessary in some cases (for example failing over the master role in a 2 node cluster with
       the  original  master  down).   If  the original master then comes up, it won't be able to
       start its master daemon because it won't have enough votes, but so won't the  new  master,
       if  the master daemon ever needs a restart.  You can pass --no-voting to ganeti-masterd on
       the new master to solve this problem, and run gnt-cluster redist-conf  to  make  sure  the
       cluster is consistent again.

       The  option  --yes-do-it  is  used together with --no-voting, for skipping the interactive
       checks.  This is even more dangerous, and should only be used in  conjunction  with  other
       means (e.g.  a HA suite) to confirm that the operation is indeed safe.

   MASTER-PING
       master-ping

       Checks if the master daemon is alive.

       If  the  master  daemon  is  alive  and  can  respond  to a basic query (the equivalent of
       gnt-cluster info), then the exit code of the command will be 0.  If the master  daemon  is
       not  alive  (either  due to a crash or because this is not the master node), the exit code
       will be 1.

   MODIFY
       modify [--submit] [--print-jobid]
       [--force]
       [--vg-name vg-name]
       [--enabled-hypervisors hypervisors]
       [{-H|--hypervisor-parameters} hypervisor:hv-param=*value*[,*hv-param*=*value*...]]
       [{-B|--backend-parameters} be-param=*value*[,*be-param*=*value*...]]
       [{-N|--nic-parameters} nic-param=*value*[,*nic-param*=*value*...]]
       [{-D|--disk-parameters} disk-template:disk-param=*value*[,*disk-param*=*value*...]]
       [--uid-pool user-id pool definition]
       [--add-uids user-id pool definition]
       [--remove-uids user-id pool definition]
       [{-C|--candidate-pool-size} candidate_pool_size]
       [--max-running-jobs count ]
       [--max-tracked-jobs count ]
       [--maintain-node-health {yes | no}]
       [--prealloc-wipe-disks {yes | no}]
       [{-I|--default-iallocator} default instance allocator]
       [--default-iallocator-params ial-param=*value*,*ial-param*=*value*]
       [--reserved-lvs=*NAMES*]
       [--node-parameters ndparams]
       [{-m|--mac-prefix} mac-prefix]
       [--master-netdev interface-name]
       [--master-netmask netmask]
       [--use-external-mip-script {yes | no}]
       [--hypervisor-state hvstate]
       [--disk-state diskstate]
       [--ipolicy-std-specs spec=*value* [,*spec*=*value*...]]
       [--ipolicy-bounds-specs bounds_ispecs]
       [--ipolicy-disk-templates template [,*template*...]]
       [--ipolicy-spindle-ratio ratio]
       [--ipolicy-vcpu-ratio ratio]
       [--enabled-disk-templates template [,*template*...]]
       [--drbd-usermode-helper helper]
       [--file-storage-dir dir]
       [--shared-file-storage-dir dir]
       [--compression-tools [tool, [tool]]]
       [--instance-communication-network network]
       [--install-image image]
       [--zeroing-image image]
       [--user-shutdown {yes | no}]
       [--enabled-data-collectors collectors]
       [--data-collector-interval intervals]

       Modify the options for the cluster.

       The        --vg-name,         --enabled-hypervisors,         -H (--hypervisor-parameters),
       -B (--backend-parameters),            -D (--disk-parameters),            --nic-parameters,
       -C (--candidate-pool-size),  --maintain-node-health,  --prealloc-wipe-disks,   --uid-pool,
       --node-parameters,         --mac-prefix,         --master-netdev,        --master-netmask,
       --use-external-mip-script,           --drbd-usermode-helper,           --file-storage-dir,
       --shared-file-storage-dir,  --compression-tools,  and --enabled-disk-templates options are
       described     in     the     init     command.      --master-netdev,     --master-netmask,
       --use-external-mip-script,           --drbd-usermode-helper,           --file-storage-dir,
       --shared-file-storage-dir,  --enabled-disk-templates,  and  --user-shutdown  options   are
       described in the init command.

       The --hypervisor-state and --disk-state options are described in detail in ganeti(7).

       The  --max-running-jobs  options allows to set limit on the number of jobs in non-finished
       jobs that are not queued, i.e., the number of jobs that are in waiting or  running  state.
       The  --max-tracked-jobs  options  allows  to set the limit on the tracked jobs.  Normally,
       Ganeti will watch waiting and running jobs by tracking their job file  with  inotify.   If
       this  limit  is  exceeded,  however,  Ganeti  will back off and only periodically pull for
       updates.

       The --add-uids and --remove-uids options can  be  used  to  modify  the  user-id  pool  by
       adding/removing a list of user-ids or user-id ranges.

       The option --reserved-lvs specifies a list (comma-separated) of logical volume group names
       (regular expressions) that will be ignored by  the  cluster  verify  operation.   This  is
       useful if the volume group used for Ganeti is shared with the system for other uses.  Note
       that it's not recommended to create and mark as ignored logical volume names  which  match
       Ganeti's  own  name format (starting with UUID and then .diskN), as this option only skips
       the verification, but not the actual use of the names given.

       To remove all reserved logical volumes, pass in an empty argument to  the  option,  as  in
       --reserved-lvs= or --reserved-lvs ''.

       The  -I (--default-iallocator)  is  described  in  the init command.  To clear the default
       iallocator, just pass an empty string ('').

       The option --default-iallocator-params is described in the init  command.   To  clear  the
       default iallocator parameters, just pass an empty string ('').

       The --ipolicy-... options are described in the init command.

       The --instance-communication-network enables instance communication by specifying the name
       of the Ganeti network that should be used for instance  communication.   If  the  supplied
       network  does  not exist, Ganeti will create a new network with the supplied name with the
       default parameters for instance communication.  If the  supplied  network  exists,  Ganeti
       will  check  its  parameters  and warn about unusual configurations, but it will still use
       that network for instance communication.

       The --enabled-data-collectors and --data-collector-interval options  are  to  control  the
       behavior  of  the ganeti-mond(8).  The first expects a list name=bool pairs to activate or
       decative the mentioned data  collector.   The  second  option  expects  similar  pairs  of
       collector  name and number of seconds specifying the interval at which the collector shall
       be collected.

       See gnt-cluster init for a description of --install-image and --zeroing-image.

       See ganeti(7) for a description of --submit and other common options.

   QUEUE
       queue {drain | undrain | info}

       Change job queue properties.

       The drain option sets the drain flag on the job queue.  No new jobs will be accepted,  but
       jobs already in the queue will be processed.

       The undrain will unset the drain flag on the job queue.  New jobs will be accepted.

       The info option shows the properties of the job queue.

   WATCHER
       watcher {pause duration | continue | info}

       Make the watcher pause or let it continue.

       The pause option causes the watcher to pause for duration seconds.

       The continue option will let the watcher continue.

       The info option shows whether the watcher is currently paused.

   REDIST-CONF
       redist-conf [--submit] [--print-jobid]

       This  command  forces a full push of configuration files from the master node to the other
       nodes in the cluster.  This is normally not needed, but can be run if the verify complains
       about configuration mismatches.

       See ganeti(7) for a description of --submit and other common options.

   RENAME
       rename [-f] {name}

       Renames  the  cluster  and in the process updates the master IP address to the one the new
       name resolves to.  At least one of either the name or the IP address  must  be  different,
       otherwise the operation will be aborted.

       Note  that since this command can be dangerous (especially when run over SSH), the command
       will require confirmation unless run with the -f option.

   RENEW-CRYPTO
       renew-crypto [-f]
       [--new-cluster-certificate] | [--new-node-certificates]
       [--new-confd-hmac-key]
       [--new-rapi-certificate] [--rapi-certificate rapi-cert]
       [--new-spice-certificate | --spice-certificate spice-cert
       --spice-ca-certificate spice-ca-cert]
       [--new-ssh-keys] [--no-ssh-key-check]
       [--new-cluster-domain-secret] [--cluster-domain-secret filename]

       This command will stop all Ganeti daemons in the cluster and start them again once the new
       certificates  and  keys  are  replicated.   The option --new-confd-hmac-key can be used to
       regenerate the HMAC key used by ganeti-confd(8).

       The option --new-cluster-certificate  will  regenerate  the  cluster-internal  server  SSL
       certificate.   The  option --new-node-certificates will generate new node SSL certificates
       for all nodes.  Note that for the regeneration of of the server SSL certficate will invoke
       a  regeneration  of the node certificates as well, because node certificates are signed by
       the server certificate and thus have  to  be  recreated  and  signed  by  the  new  server
       certificate.   Nodes  which  are  offline  during  a  renewal  of  the  server or the node
       certificates are not accessible anymore once they are marked  as  online  again.   To  fix
       this, please readd the node instead.

       To   generate  a  new  self-signed  RAPI  certificate  (used  by  ganeti-rapi(8))  specify
       --new-rapi-certificate.  If you want to use your own certificate, e.g.  one  signed  by  a
       certificate authority (CA), pass its filename to --rapi-certificate.

       To  generate  a  new  self-signed SPICE certificate, used for SPICE connections to the KVM
       hypervisor, specify  the  --new-spice-certificate  option.   If  you  want  to  provide  a
       certificate,  pass its filename to --spice-certificate and pass the signing CA certificate
       to --spice-ca-certificate.

       The option --new-ssh-keys renews all SSH keys of all nodes and updates the authorized_keys
       files  of  all  nodes  to contain only the (new) public keys of all master candidates.  To
       avoid having to confirm the fingerprint of each node use  the  --no-ssh-key-check  option.
       Be  aware  of  that  this  includes  a  security  risk as you omit verifying the machines'
       identities.

       Finally --new-cluster-domain-secret generates a new, random  cluster  domain  secret,  and
       --cluster-domain-secret  reads  the secret from a file.  The cluster domain secret is used
       to sign information exchanged between separate clusters via a third party.

   REPAIR-DISK-SIZES
       repair-disk-sizes [instance...]

       This command checks that the recorded size of  the  given  instance's  disks  matches  the
       actual  size and updates any mismatches found.  This is needed if the Ganeti configuration
       is no longer consistent with reality, as it will  impact  some  disk  operations.   If  no
       arguments  are  given,  all  instances will be checked.  When exclusive storage is active,
       also spindles are updated.

       Note that only active disks can be checked by this command;  in  case  a  disk  cannot  be
       activated  it's  advised  to  use  gnt-instance  activate-disks --ignore-size ... to force
       activation without regard to the current size.

       When all the disk sizes are consistent, the command will return no output.   Otherwise  it
       will log details about the inconsistencies in the configuration.

   UPGRADE
       upgrade {--to version | --resume}

       This  command  safely  switches all nodes of the cluster to a new Ganeti version.  It is a
       prerequisite that the new version is already  installed,  albeit  not  activated,  on  all
       nodes; this requisite is checked before any actions are done.

       If called with the --resume option, any pending upgrade is continued, that was interrupted
       by a power failure or similar on master.  It will do nothing, if not  run  on  the  master
       node, or if no upgrade was in progress.

   VERIFY
       verify [--no-nplus1-mem] [--node-group nodegroup]
       [--error-codes] [{-I|--ignore-errors} errorcode]
       [{-I|--ignore-errors} errorcode...]
       [--verify-ssh-clutter]

       Verify  correctness  of  cluster  configuration.   This  is  safe  with respect to running
       instances, and incurs no downtime of the instances.

       If the --no-nplus1-mem option is given, Ganeti won't check whether if it loses a  node  it
       can restart all the instances on their secondaries (and report an error otherwise).

       With --node-group, restrict the verification to those nodes and instances that live in the
       named group.  This will not verify global settings, but will allow to perform verification
       of a group while other operations are ongoing in other groups.

       The   --error-codes   option  outputs  each  error  in  the  following  parseable  format:
       ftype:ecode:edomain:name:msg.  These fields have the following meaning:

       ftype  Failure type.  Can be WARNING or ERROR.

       ecode  Error code of the failure.  See below for a list of error codes.

       edomain
              Can be cluster, node or instance.

       name   Contains the name of the item that is affected from the failure.

       msg    Contains a descriptive error message about the error

       gnt-cluster verify will have a non-zero exit code if at least one of the failures that are
       found are of type ERROR.

       The  --ignore-errors  option  can be used to change this behaviour, because it demotes the
       error represented by the error code received as a parameter to a warning.  The option must
       be     repeated     for     each     error     that     should     be    ignored    (e.g.:
       -I ENODEVERSION -I ENODEORPHANLV).  The --error-codes option can be used to determine  the
       error code of a given error.

       Note  that the verification of the configuration file consistency across master candidates
       can fail if there are other concurrently running operations that modify the configuration.

       The  --verify-ssh-clutter  option  checks  if  more  than  one  SSH  key  for   the   same
       <'user@hostname>'  pair  exists  in the 'authorizied_keys' file.  This is only checked for
       hostnames of nodes which belong to the cluster.  This check  is  optional,  because  there
       might  be  other  systems  manipulating the 'authorized_keys' files, which would cause too
       many false positives otherwise.

       List of error codes:

       ENODESHAREDFILESTORAGEPATHUNUSABLE
              Shared file storage path unusable

       EINSTANCEWRONGNODE
              Instance running on the wrong node

       ENODEOOBPATH
              Invalid Out Of Band path

       ENODEORPHANINSTANCE
              Unknown intance running on a node

       ECLUSTERDANGLINGINST
              Some instances have a non-existing primary node

       ENODESSH
              SSH-related node error

       ECLUSTERFILECHECK
              Cluster configuration verification failure

       ENODEHOOKS
              Communication failure in hooks execution

       ENODEDRBDHELPER
              Error caused by the DRBD helper

       EINSTANCEMISSINGDISK
              Missing volume on an instance

       EINSTANCEPOLICY
              Instance does not meet policy

       ENODEFILESTORAGEPATHS
              Detected bad file storage paths

       ECLUSTERDANGLINGNODES
              Some nodes belong to non-existing groups

       EINSTANCEDOWN
              Instance not running on its primary node

       EINSTANCELAYOUT
              Instance has multiple secondary nodes

       ENODENET
              Network-related node error

       EINSTANCEUNSUITABLENODE
              Instance running on nodes that are not suitable for it

       EINSTANCEBADNODE
              Instance marked as running lives on an offline node

       ENODEUSERSCRIPTS
              User scripts not present or not executable

       ENODEDRBDVERSION
              DRBD version mismatch within a node group

       ENODEFILESTORAGEPATHUNUSABLE
              File storage path unusable

       EINSTANCEFAULTYDISK
              Impossible to retrieve status for a disk

       ENODEVERSION
              Protocol version mismatch or Ganeti version mismatch

       ECLUSTERCERT
              Cluster certificate files verification failure

       ENODEDRBD
              Error parsing the DRBD status file

       EGROUPDIFFERENTPVSIZE
              PVs in the group have different sizes

       ENODETIME
              Node returned invalid time

       ENODEN1
              Not enough memory to accommodate instance failovers

       ENODEOS
              OS-related node error

       ENODERPC
              Error during connection to the primary node of an instance

       EINSTANCESPLITGROUPS
              Instance with primary and secondary nodes in different groups

       ENODESETUP
              Node setup error

       ENODEGLUSTERSTORAGEPATHUNUSABLE
              Gluster storage path unusable

       ECLUSTERCFG
              Cluster configuration verification failure

       EINSTANCEMISSINGCFGPARAMETER
              A configuration parameter for an instance is missing

       ENODELVM
              LVM-related node error

       ENODEORPHANLV
              Unknown LVM logical volume

       ENODEFILECHECK
              Error retrieving the checksum of the node files

       ENODEHV
              Hypervisor parameters verification failure

   VERIFY-DISKS
       verify-disks

       The command checks which instances have degraded DRBD disks and  activates  the  disks  of
       those instances.

       This   command  is  run  from  the  ganeti-watcher  tool,  which  also  has  a  different,
       complementary algorithm for doing this check.  Together, these two should ensure that DRBD
       disks are kept consistent.

   VERSION
       version

       Show the cluster version.

   Tags
   ADD-TAGS
       add-tags [--from file] {tag...}

       Add  tags  to  the  cluster.   If  any of the tags contains invalid characters, the entire
       operation will abort.

       If the --from option is given, the list of tags will be extended with the contents of that
       file  (each  line  becomes  a  tag).   In this case, there is not need to pass tags on the
       command line (if you do, both sources will be used).  A file name of - will be interpreted
       as stdin.

   LIST-TAGS
       list-tags

       List the tags of the cluster.

   REMOVE-TAGS
       remove-tags [--from file] {tag...}

       Remove  tags  from  the  cluster.  If any of the tags are not existing on the cluster, the
       entire operation will abort.

       If the --from option is given, the list of tags to be removed will be  extended  with  the
       contents  of that file (each line becomes a tag).  In this case, there is not need to pass
       tags on the command line (if you do, tags from both sources will be removed).  A file name
       of - will be interpreted as stdin.

   SEARCH-TAGS
       search-tags {pattern}

       Searches  the  tags  on  all objects in the cluster (the cluster itself, the nodes and the
       instances) for a given pattern.  The pattern is interpreted as a regular expression and  a
       search will be done on it (i.e.  the given pattern is not anchored to the beggining of the
       string; if you want that, prefix the pattern with ^).

       If no tags are matching the pattern, the exit code of the command will be one.   If  there
       is  at least one match, the exit code will be zero.  Each match is listed on one line, the
       object and the tag separated by a space.  The cluster will be listed as /cluster,  a  node
       will be listed as /nodes/name, and an instance as /instances/name.  Example:

              # gnt-cluster search-tags time
              /cluster ctime:2007-09-01
              /nodes/node1.example.com mtime:2007-10-04

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
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