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gnt-group(8) Ganeti | Version @GANETI_VERSION@ |
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============================================== |
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|
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Name |
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---- |
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|
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gnt-group - Ganeti node-group administration |
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|
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Synopsis |
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-------- |
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|
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**gnt-group** {command} [arguments...] |
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|
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DESCRIPTION |
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----------- |
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|
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The **gnt-group** command is used for node group administration in |
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the Ganeti system. |
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|
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COMMANDS |
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-------- |
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|
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ADD |
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~~~ |
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|
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| **add** |
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| [--node-parameters=*NDPARAMS*] |
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| [--alloc-policy=*POLICY*] |
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| {*group*} |
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|
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Creates a new group with the given name. The node group will be |
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initially empty; to add nodes to it, use ``gnt-group assign-nodes``. |
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|
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The ``--node-parameters`` option allows you to set default node |
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parameters for nodes in the group. Please see **ganeti**(7) for more |
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information about supported key=value pairs. |
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|
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The ``--alloc-policy`` option allows you to set an allocation policy for |
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the group at creation time. Possible values are: |
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|
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unallocable |
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nodes in the group should not be candidates for instance allocation, |
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and the operation (e.g., instance creation) should fail if only |
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groups in this state could be found to satisfy the requirements. |
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|
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last_resort |
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nodes in the group should not be used for instance allocations, |
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unless this would be the only way to have the operation succeed. |
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|
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preferred |
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nodes in the group can be used freely for allocation of instances |
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(this is the default). Note that prioritization among groups in this |
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state will be deferred to the iallocator plugin that's being used. |
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|
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ASSIGN-NODES |
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~~~~~~~~~~~~ |
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|
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| **assign-nodes** |
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| [--force] |
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| {*group*} {*node*...} |
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|
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Assigns one or more nodes to the specified group, moving them from their |
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original group (or groups). |
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|
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By default, this command will refuse to proceed if the move would split |
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between groups any instance that was not previously split (a split |
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instance is an instance with a mirrored disk template, e.g. DRBD, that |
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has the primary and secondary nodes in different node groups). You can |
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force the operation with ``--force``. |
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|
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MODIFY |
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~~~~~~ |
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|
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| **modify** |
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| [--node-parameters=*NDPARAMS*] |
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| [--alloc-policy=*POLICY*] |
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| {*group*} |
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|
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Modifies some parameters from the node group. |
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|
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The ``--node-parameters`` and ``--alloc-policy`` optiosn are documented |
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in the **add** command above. |
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|
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REMOVE |
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~~~~~~ |
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|
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| **remove** {*group*} |
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|
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Deletes the indicated node group, which must be empty. |
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|
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LIST |
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~~~~ |
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|
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| **list** [--no-headers] [--separator=*SEPARATOR*] |
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| [-o *[+]FIELD,...*] [group...] |
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|
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Lists all existing node groups in the cluster. |
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|
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The ``--no-headers`` option will skip the initial header line. The |
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``--separator`` option takes an argument which denotes what will be |
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used between the output fields. Both these options are to help |
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scripting. |
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|
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The ``-o`` option takes a comma-separated list of output fields. |
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If the value of the option starts with the character ``+``, the new |
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fields will be added to the default list. This allows to quickly |
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see the default list plus a few other fields, instead of retyping |
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the entire list of fields. |
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|
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The available fields and their meaning are: |
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|
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name |
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the group name |
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uuid |
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the group's UUID |
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node_cnt |
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the number of nodes in the node group |
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|
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node_list |
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the list of nodes that belong to this group |
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|
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pinst_cnt |
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the number of primary instances in the group (i.e., the number of |
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primary instances nodes in this group have) |
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pinst_list |
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the list of primary instances in the group |
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|
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alloc_policy |
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the current allocation policy for the group |
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|
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ctime |
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the creation time of the group; note that this field contains spaces |
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and as such it's harder to parse |
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|
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if this attribute is not present (e.g. when upgrading from older |
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versions), then "N/A" will be shown instead |
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|
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mtime |
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the last modification time of the group; note that this field |
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contains spaces and as such it's harder to parse |
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|
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serial_no |
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the so called 'serial number' of the group; this is a numeric field |
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that is incremented each time the node is modified, and it can be |
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used to detect modifications |
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|
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If no group names are given, then all groups are included. Otherwise, |
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only the named groups will be listed. |
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|
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LIST-FIELDS |
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~~~~~~~~~~~ |
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**list-fields** [field...] |
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List available fields for node groups. |
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|
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RENAME |
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~~~~~~ |
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|
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| **rename** {*oldname*} {*newname*} |
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Renames a given group from *oldname* to *newname*. |