1 gnt-group(8) Ganeti | Version @GANETI_VERSION@
2 ==============================================
7 gnt-group - Ganeti node-group administration
12 **gnt-group** {command} [arguments...]
17 The **gnt-group** command is used for node group administration in
27 | [\--node-parameters=*NDPARAMS*]
28 | [\--alloc-policy=*POLICY*]
29 | [{-D|\--disk-parameters} *disk-template*:*disk-param*=*value*[,*disk-param*=*value*...]]
30 | [\--specs-cpu-count *spec-param*=*value* [,*spec-param*=*value*...]]
31 | [\--specs-disk-count *spec-param*=*value* [,*spec-param*=*value*...]]
32 | [\--specs-disk-size *spec-param*=*value* [,*spec-param*=*value*...]]
33 | [\--specs-mem-size *spec-param*=*value* [,*spec-param*=*value*...]]
34 | [\--specs-nic-count *spec-param*=*value* [,*spec-param*=*value*...]]
35 | [\--ipolicy-bounds-specs *bound_ispecs*]
36 | [\--ipolicy-disk-templates *template* [,*template*...]]
37 | [\--ipolicy-spindle-ratio *ratio*]
38 | [\--ipolicy-vcpu-ratio *ratio*]
39 | [\--disk-state *diskstate*]
40 | [\--hypervisor-state *hvstate*]
43 Creates a new group with the given name. The node group will be
44 initially empty; to add nodes to it, use ``gnt-group assign-nodes``.
46 The ``--node-parameters`` option allows you to set default node
47 parameters for nodes in the group. Please see **ganeti**\(7) for more
48 information about supported key=value pairs and their corresponding
51 The ``--alloc-policy`` option allows you to set an allocation policy for
52 the group at creation time. Possible values are:
55 nodes in the group should not be candidates for instance allocation,
56 and the operation (e.g., instance creation) should fail if only
57 groups in this state could be found to satisfy the requirements.
60 nodes in the group should not be used for instance allocations,
61 unless this would be the only way to have the operation succeed.
64 nodes in the group can be used freely for allocation of instances
65 (this is the default). Note that prioritization among groups in this
66 state will be deferred to the iallocator plugin that's being used.
68 The ``-D (--disk-parameters)`` option allows you to set the disk
69 parameters for the node group; please see the section about
70 **gnt-cluster add** in **gnt-cluster**\(8) for more information about
73 The ``--specs-...`` and ``--ipolicy-...`` options specify instance
74 policies on the node group, and are documented in the
75 **gnt-cluster**\(8) man page.
77 See **ganeti**\(7) for a description of ``--submit`` and other common
84 | [\--force] [\--submit]
85 | {*group*} {*node*...}
87 Assigns one or more nodes to the specified group, moving them from their
88 original group (or groups).
90 By default, this command will refuse to proceed if the move would split
91 between groups any instance that was not previously split (a split
92 instance is an instance with a mirrored disk template, e.g. DRBD, that
93 has the primary and secondary nodes in different node groups). You can
94 force the operation with ``--force``.
96 See **ganeti**\(7) for a description of ``--submit`` and other common
102 | **modify** [\--submit]
103 | [\--node-parameters=*NDPARAMS*]
104 | [\--alloc-policy=*POLICY*]
105 | [\--hypervisor-state *hvstate*]
106 | [{-D|\--disk-parameters} *disk-template*:*disk-param*=*value*[,*disk-param*=*value*...]]
107 | [\--disk-state *diskstate*]
108 | [\--specs-cpu-count *spec-param*=*value* [,*spec-param*=*value*...]]
109 | [\--specs-disk-count *spec-param*=*value* [,*spec-param*=*value*...]]
110 | [\--specs-disk-size *spec-param*=*value* [,*spec-param*=*value*...]]
111 | [\--specs-mem-size *spec-param*=*value* [,*spec-param*=*value*...]]
112 | [\--specs-nic-count *spec-param*=*value* [,*spec-param*=*value*...]]
113 | [\--ipolicy-bounds-specs *bound_ispecs*]
114 | [\--ipolicy-disk-templates *template* [,*template*...]]
115 | [\--ipolicy-spindle-ratio *ratio*]
116 | [\--ipolicy-vcpu-ratio *ratio*]
119 Modifies some parameters from the node group.
121 The ``--node-parameters`` and ``--alloc-policy`` options are documented
122 in the **add** command above. ``--hypervisor-state`` as well as
123 ``--disk-state`` are documented in detail in **ganeti**\(7).
125 The ``--node-parameters``, ``--alloc-policy``, ``-D
126 (--disk-parameters)`` options are documented in the **add** command
129 The ``--specs-...`` and ``--ipolicy-...`` options specify instance
130 policies on the node group, and are documented in the
131 **gnt-cluster**\(8) man page.
133 See **ganeti**\(7) for a description of ``--submit`` and other common
139 | **remove** [\--submit] {*group*}
141 Deletes the indicated node group, which must be empty. There must always be at
142 least one group, so the last group cannot be removed.
144 See **ganeti**\(7) for a description of ``--submit`` and other common
150 | **list** [\--no-headers] [\--separator=*SEPARATOR*] [-v]
151 | [-o *[+]FIELD,...*] [\--filter] [group...]
153 Lists all existing node groups in the cluster.
155 The ``--no-headers`` option will skip the initial header line. The
156 ``--separator`` option takes an argument which denotes what will be
157 used between the output fields. Both these options are to help
160 The ``-v`` option activates verbose mode, which changes the display of
161 special field states (see **ganeti**\(7)).
163 The ``-o`` option takes a comma-separated list of output fields.
164 If the value of the option starts with the character ``+``, the new
165 fields will be added to the default list. This allows one to quickly
166 see the default list plus a few other fields, instead of retyping
167 the entire list of fields.
169 The available fields and their meaning are:
173 If exactly one argument is given and it appears to be a query filter
174 (see **ganeti**\(7)), the query result is filtered accordingly. For
175 ambiguous cases (e.g. a single field name as a filter) the ``--filter``
176 (``-F``) option forces the argument to be treated as a filter.
178 If no group names are given, then all groups are included. Otherwise,
179 only the named groups will be listed.
184 **list-fields** [field...]
186 List available fields for node groups.
191 | **rename** [\--submit] {*oldname*} {*newname*}
193 Renames a given group from *oldname* to *newname*.
195 See **ganeti**\(7) for a description of ``--submit`` and other common
202 **evacuate** [\--submit] [\--iallocator *NAME*] [\--to *GROUP*...] {*group*}
204 This command will move all instances out of the given node group.
205 Instances are placed in a new group by an iallocator, either given on
206 the command line or as a cluster default.
208 If no specific destination groups are specified using ``--to``, all
209 groups except the evacuated group are considered.
211 See **ganeti**\(7) for a description of ``--submit`` and other common
216 # gnt-group evacuate -I hail --to rack4 rack1
225 **add-tags** [\--from *file*] {*groupname*} {*tag*...}
227 Add tags to the given node group. If any of the tags contains invalid
228 characters, the entire operation will abort.
230 If the ``--from`` option is given, the list of tags will be extended
231 with the contents of that file (each line becomes a tag). In this case,
232 there is not need to pass tags on the command line (if you do, both
233 sources will be used). A file name of ``-`` will be interpreted as
239 **list-tags** {*groupname*}
241 List the tags of the given node group.
246 **remove-tags** [\--from *file*] {*groupname*} {*tag*...}
248 Remove tags from the given node group. If any of the tags are not
249 existing on the node, the entire operation will abort.
251 If the ``--from`` option is given, the list of tags to be removed will
252 be extended with the contents of that file (each line becomes a tag). In
253 this case, there is not need to pass tags on the command line (if you
254 do, tags from both sources will be removed). A file name of ``-`` will
255 be interpreted as stdin.
260 **info** [*group*...]
262 Shows config information for all (or given) groups.
267 **show-ispecs-cmd** [\--include-defaults] [*group*...]
269 Shows the command line that can be used to recreate the given groups (or
270 all groups, if none is given) with the same options relative to specs in
271 the instance policies.
273 If ``--include-defaults`` is specified, include also the default values
274 (i.e. the cluster-level settings), and not only the configuration items
275 that a group overrides.
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