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gnt-group(8) Ganeti | Version @GANETI_VERSION@

==============================================

Name

----

gnt-group - Ganeti node-group administration

Synopsis

--------

**gnt-group** {command} [arguments...]

DESCRIPTION

-----------

The **gnt-group** command is used for node group administration in

the Ganeti system.

COMMANDS

--------

ADD

~~~

| **add**

| [--node-parameters=*NDPARAMS*]

| [--alloc-policy=*POLICY*]

| [{-D|--disk-parameters} *disk-template*:*disk-param*=*value* [,*disk-param*=*value*...]]

| [--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*...]]

| {*group*}

Creates a new group with the given name. The node group will be

initially empty; to add nodes to it, use ``gnt-group assign-nodes``.

The ``--node-parameters`` option allows you to set default node

parameters for nodes in the group. Please see **ganeti**(7) for more

information about supported key=value pairs.

The ``--alloc-policy`` option allows you to set an allocation policy for

the group at creation time. Possible values are:

unallocable

    nodes in the group should not be candidates for instance allocation,

    and the operation (e.g., instance creation) should fail if only

    groups in this state could be found to satisfy the requirements.

last_resort

    nodes in the group should not be used for instance allocations,

    unless this would be the only way to have the operation succeed.

preferred

    nodes in the group can be used freely for allocation of instances

    (this is the default). Note that prioritization among groups in this

    state will be deferred to the iallocator plugin that's being used.

The ``-D (--disk-parameters)`` option allows you to set the disk

parameters for the node group; please see the section about

**gnt-cluster add** in **gnt-cluster**(8) for more information about

disk parameters

The ``--specs-..`` options specify instance policy on the cluster. Each

option can have two values: ``min`` and ``max``.

``--specs-cpu-count`` sets the number of VCPUs that can be used by an

instance.

``--specs-disk-count`` sets 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 amount of nics used

ASSIGN-NODES

~~~~~~~~~~~~

| **assign-nodes**

| [--force]

| {*group*} {*node*...}

Assigns one or more nodes to the specified group, moving them from their

original group (or groups).

By default, this command will refuse to proceed if the move would split

between groups any instance that was not previously split (a split

instance is an instance with a mirrored disk template, e.g. DRBD, that

has the primary and secondary nodes in different node groups). You can

force the operation with ``--force``.

MODIFY

~~~~~~

| **modify**

| [--node-parameters=*NDPARAMS*]

| [--alloc-policy=*POLICY*]

| [--hypervisor-state *hvstate*]

| [{-D|--disk-parameters} *disk-template*:*disk-param*=*value* [,*disk-param*=*value*...]]

| [--disk-state *diskstate*]

| [--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*...]]

| {*group*}

Modifies some parameters from the node group.

The ``--node-parameters`` and ``--alloc-policy`` options are documented

in the **add** command above. ``--hypervisor-state`` as well as

``--disk-state`` are documented in detail in **ganeti**(7).

The ``--node-parameters``, ``--alloc-policy``, ``-D

(--disk-parameters)`` and ``--specs-..`` options are documented in the

**add** command above.

REMOVE

~~~~~~

| **remove** {*group*}

Deletes the indicated node group, which must be empty. There must always be at

least one group, so the last group cannot be removed.

LIST

~~~~

| **list** [--no-headers] [--separator=*SEPARATOR*] [-v]

| [-o *[+]FIELD,...*] [--filter] [group...]

Lists all existing node groups in the cluster.

The ``--no-headers`` option will skip the initial header line. The

``--separator`` option takes an argument which denotes what will be

used between the output fields. Both these options are to help

scripting.

The ``-v`` option activates verbose mode, which changes the display of

special field states (see **ganeti(7)**).

The ``-o`` option takes a comma-separated list of output fields.

If the value of the option starts with the character ``+``, the new

fields will be added to the default list. This allows one to quickly

see the default list plus a few other fields, instead of retyping

the entire list of fields.

The available fields and their meaning are:

@QUERY_FIELDS_GROUP@

If exactly one argument is given and it appears to be a query filter

(see **ganeti(7)**), the query result is filtered accordingly. For

ambiguous cases (e.g. a single field name as a filter) the ``--filter``

(``-F``) option forces the argument to be treated as a filter.

If no group names are given, then all groups are included. Otherwise,

only the named groups will be listed.

LIST-FIELDS

~~~~~~~~~~~

**list-fields** [field...]

List available fields for node groups.

RENAME

~~~~~~

| **rename** {*oldname*} {*newname*}

Renames a given group from *oldname* to *newname*.

EVACUATE

~~~~~~~~

**evacuate** [--iallocator *NAME*] [--to *GROUP*...] {*group*}

This command will move all instances out of the given node group.

Instances are placed in a new group by an iallocator, either given on

the command line or as a cluster default.

If no specific destination groups are specified using ``--to``, all

groups except the evacuated group are considered.

Example::

    # gnt-group evacuate -I hail --to rack4 rack1

TAGS

~~~~

ADD-TAGS

^^^^^^^^

**add-tags** [--from *file*] {*groupname*} {*tag*...}

Add tags to the given node group. 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** {*groupname*}

List the tags of the given node group.

REMOVE-TAGS

^^^^^^^^^^^

**remove-tags** [--from *file*] {*groupname*} {*tag*...}

Remove tags from the given node group. If any of the tags are not

existing on the node, 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.

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