Ganeti customisation using hooks
================================
-Documents ganeti version 2.0
+Documents Ganeti version 2.5
.. contents::
Naming
~~~~~~
-The allowed names for the scripts consist of (similar to *run-parts* )
+The allowed names for the scripts consist of (similar to *run-parts*)
upper and lower case, digits, underscores and hyphens. In other words,
the regexp ``^[a-zA-Z0-9_-]+$``. Also, non-executable scripts will be
ignored.
- stdout and stderr are directed to files
-- PATH is reset to ``/sbin:/bin:/usr/sbin:/usr/bin``
+- PATH is reset to :pyeval:`constants.HOOKS_PATH`
- the environment is cleared, and only ganeti-specific variables will
be left
Node operations
~~~~~~~~~~~~~~~
-OP_ADD_NODE
+OP_NODE_ADD
+++++++++++
Adds a node to the cluster.
:directory: node-add
-:env. vars: NODE_NAME, NODE_PIP, NODE_SIP
+:env. vars: NODE_NAME, NODE_PIP, NODE_SIP, MASTER_CAPABLE, VM_CAPABLE
:pre-execution: all existing nodes
:post-execution: all nodes plus the new node
-OP_REMOVE_NODE
+OP_NODE_REMOVE
++++++++++++++
Removes a node from the cluster. On the removed node the hooks are
Changes a node's parameters.
:directory: node-modify
-:env. vars: MASTER_CANDIDATE, OFFLINE, DRAINED
+:env. vars: MASTER_CANDIDATE, OFFLINE, DRAINED, MASTER_CAPABLE, VM_CAPABLE
:pre-execution: master node, the target node
:post-execution: master node, the target node
Node group operations
~~~~~~~~~~~~~~~~~~~~~
-OP_ADD_GROUP
+OP_GROUP_ADD
++++++++++++
Adds a node group to the cluster.
:pre-execution: master node
:post-execution: master node
-OP_REMOVE_GROUP
+OP_GROUP_SET_PARAMS
++++++++++++++++++++
+
+Changes a node group's parameters.
+
+:directory: group-modify
+:env. vars: GROUP_NAME, NEW_ALLOC_POLICY
+:pre-execution: master node
+:post-execution: master node
+
+OP_GROUP_REMOVE
+++++++++++++++
Removes a node group from the cluster. Since the node group must be
:pre-execution: master node
:post-execution: master node
-OP_RENAME_GROUP
+OP_GROUP_RENAME
+++++++++++++++
Renames a node group.
:pre-execution: master node and all nodes in the group
:post-execution: master node and all nodes in the group
+OP_GROUP_EVACUATE
++++++++++++++++++
+
+Evacuates a node group.
+
+:directory: group-evacuate
+:env. vars: GROUP_NAME, TARGET_GROUPS
+:pre-execution: master node and all nodes in the group
+:post-execution: master node and all nodes in the group
+
Instance operations
~~~~~~~~~~~~~~~~~~~
All instance operations take at least the following variables:
-INSTANCE_NAME, INSTANCE_PRIMARY, INSTANCE_SECONDARIES,
+INSTANCE_NAME, INSTANCE_PRIMARY, INSTANCE_SECONDARY,
INSTANCE_OS_TYPE, INSTANCE_DISK_TEMPLATE, INSTANCE_MEMORY,
INSTANCE_DISK_SIZES, INSTANCE_VCPUS, INSTANCE_NIC_COUNT,
INSTANCE_NICn_IP, INSTANCE_NICn_BRIDGE, INSTANCE_NICn_MAC,
properties of the *n* -th NIC and disk, and are zero-indexed.
-OP_INSTANCE_ADD
-+++++++++++++++
+OP_INSTANCE_CREATE
+++++++++++++++++++
Creates a new instance.
Exports the instance.
:directory: instance-export
-:env. vars: EXPORT_NODE, EXPORT_DO_SHUTDOWN
+:env. vars: EXPORT_MODE, EXPORT_NODE, EXPORT_DO_SHUTDOWN, REMOVE_INSTANCE
:pre-execution: master node, primary and secondary nodes
:post-execution: master node, primary and secondary nodes
-OP_INSTANCE_START
-+++++++++++++++++
+OP_INSTANCE_STARTUP
++++++++++++++++++++
Starts an instance.
Stops an instance.
:directory: instance-stop
-:env. vars: only the standard instance vars
+:env. vars: TIMEOUT
:pre-execution: master node, primary and secondary nodes
:post-execution: master node, primary and secondary nodes
Reboots an instance.
:directory: instance-reboot
-:env. vars: IGNORE_SECONDARIES, REBOOT_TYPE
+:env. vars: IGNORE_SECONDARIES, REBOOT_TYPE, SHUTDOWN_TIMEOUT
:pre-execution: master node, primary and secondary nodes
:post-execution: master node, primary and secondary nodes
-OP_INSTANCE_MODIFY
-++++++++++++++++++
+OP_INSTANCE_SET_PARAMS
+++++++++++++++++++++++
Modifies the instance parameters.
:directory: instance-modify
-:env. vars: only the standard instance vars
+:env. vars: NEW_DISK_TEMPLATE
:pre-execution: master node, primary and secondary nodes
:post-execution: master node, primary and secondary nodes
++++++++++++++++++++
Failovers an instance. In the post phase INSTANCE_PRIMARY and
-INSTANCE_SECONDARIES refer to the nodes that were repectively primary
+INSTANCE_SECONDARY refer to the nodes that were repectively primary
and secondary before failover.
:directory: instance-failover
-:env. vars: IGNORE_CONSISTENCY, OLD_SECONDARY, OLD_PRIMARY, NEW_SECONDARY, NEW_PRIMARY
+:env. vars: IGNORE_CONSISTENCY, SHUTDOWN_TIMEOUT, OLD_PRIMARY, OLD_SECONDARY, NEW_PRIMARY, NEW_SECONDARY
:pre-execution: master node, secondary node
:post-execution: master node, primary and secondary nodes
++++++++++++++++++++
Migrates an instance. In the post phase INSTANCE_PRIMARY and
-INSTANCE_SECONDARIES refer to the nodes that were repectively primary
+INSTANCE_SECONDARY refer to the nodes that were repectively primary
and secondary before migration.
:directory: instance-migrate
-:env. vars: MIGRATE_LIVE, MIGRATE_CLEANUP, OLD_SECONDARY, OLD_PRIMARY, NEW_SECONDARY, NEW_PRIMARY
+:env. vars: MIGRATE_LIVE, MIGRATE_CLEANUP, OLD_PRIMARY, OLD_SECONDARY, NEW_PRIMARY, NEW_SECONDARY
:pre-execution: master node, secondary node
:post-execution: master node, primary and secondary nodes
Remove an instance.
:directory: instance-remove
-:env. vars: only the standard instance vars
+:env. vars: SHUTDOWN_TIMEOUT
:pre-execution: master node
:post-execution: master node, primary and secondary nodes
Move an instance by data-copying.
:directory: instance-move
-:env. vars: TARGET_NODE
+:env. vars: TARGET_NODE, SHUTDOWN_TIMEOUT
:pre-execution: master node, primary and target nodes
:post-execution: master node, primary and target nodes
:pre-execution: master node, primary and new secondary nodes
:post-execution: master node, primary and new secondary nodes
+OP_INSTANCE_CHANGE_GROUP
+++++++++++++++++++++++++
+
+Moves an instance to another group.
+
+:directory: instance-change-group
+:env. vars: TARGET_GROUPS
+:pre-execution: master node
+:post-execution: master node
+
Cluster operations
~~~~~~~~~~~~~~~~~~
-OP_POST_INIT_CLUSTER
+OP_CLUSTER_POST_INIT
++++++++++++++++++++
This hook is called via a special "empty" LU right after cluster
:pre-execution: none
:post-execution: master node
-OP_DESTROY_CLUSTER
+OP_CLUSTER_DESTROY
++++++++++++++++++
The post phase of this hook is called during the execution of destroy
:pre-execution: none
:post-execution: master node
-OP_CLUSTER_VERIFY
-+++++++++++++++++
+OP_CLUSTER_VERIFY_GROUP
++++++++++++++++++++++++
-Verifies the cluster status. This is a special LU with regard to
+Verifies all nodes in a group. This is a special LU with regard to
hooks, as the result of the opcode will be combined with the result of
post-execution hooks, in order to allow administrators to enhance the
cluster verification procedure.
:directory: cluster-verify
:env. vars: CLUSTER, MASTER, CLUSTER_TAGS, NODE_TAGS_<name>
:pre-execution: none
-:post-execution: all nodes
+:post-execution: all nodes in a group
OP_CLUSTER_RENAME
+++++++++++++++++
Environment variables
---------------------
-Note that all variables listed here are actually prefixed with
-*GANETI_* in order to provide a clear namespace.
+Note that all variables listed here are actually prefixed with *GANETI_*
+in order to provide a clear namespace. In addition, post-execution
+scripts receive another set of variables, prefixed with *GANETI_POST_*,
+representing the status after the opcode executed.
Common variables
~~~~~~~~~~~~~~~~
INSTANCE_NAME
The name of the instance which is the target of the operation.
+INSTANCE_BE_x,y,z,...
+ Instance BE params. There is one variable per BE param. For instance, GANETI_INSTANCE_BE_auto_balance
+
INSTANCE_DISK_TEMPLATE
The disk type for the instance.
+NEW_DISK_TEMPLATE
+ The new disk type for the instance.
+
INSTANCE_DISK_COUNT
The number of disks for the instance.
INSTANCE_DISKn_MODE
Either *rw* for a read-write disk or *ro* for a read-only one.
+INSTANCE_HV_x,y,z,...
+ Instance hypervisor options. There is one variable per option. For instance, GANETI_INSTANCE_HV_use_bootloader
+
+INSTANCE_HYPERVISOR
+ The instance hypervisor.
+
INSTANCE_NIC_COUNT
The number of NICs for the instance.
INSTANCE_NICn_MAC
The MAC address of the *n* -th NIC of the instance.
+INSTANCE_NICn_MODE
+ The mode of the *n* -th NIC of the instance.
+
INSTANCE_OS_TYPE
The name of the instance OS.
the nodes change during the exectution, but on the
OLD_PRIMARY/NEW_PRIMARY values.
-INSTANCE_SECONDARIES
+INSTANCE_SECONDARY
Space-separated list of secondary nodes for the instance. Note that
for migrations/failovers, you shouldn't rely on this variable since
the nodes change during the exectution, but on the
INSTANCE_STATUS
The run status of the instance.
+MASTER_CAPABLE
+ Whether a node is capable of being promoted to master.
+
+VM_CAPABLE
+ Whether the node can host instances.
+
+INSTANCE_TAGS
+ A space-delimited list of the instance's tags.
+
NODE_NAME
The target node of this operation (not the node on which the hook
runs).
For migrations/failovers, the old and respectively new primary
nodes. These two mirror the NEW_SECONDARY/OLD_SECONDARY variables
+EXPORT_MODE
+ The instance export mode. Either "remote" or "local".
+
EXPORT_NODE
The node on which the exported image of the instance was done.
the filesystem would need a check (journal replay or full fsck) in
order to guarantee consistency.
+REMOVE_INSTANCE
+ Whether the instance was removed from the node.
+
+SHUTDOWN_TIMEOUT
+ Amount of time to wait for the instance to shutdown.
+
+TIMEOUT
+ Amount of time to wait before aborting the op.
+
+OLD_NAME, NEW_NAME
+ Old/new name of the node group.
+
+GROUP_NAME
+ The name of the node group.
+
+NEW_ALLOC_POLICY
+ The new allocation policy for the node group.
+
CLUSTER_TAGS
The list of cluster tags, space separated.
GANETI_INSTANCE_NIC_COUNT=1
GANETI_INSTANCE_OS_TYPE=debootstrap
GANETI_INSTANCE_PRIMARY=node3.example.com
- GANETI_INSTANCE_SECONDARIES=node5.example.com
+ GANETI_INSTANCE_SECONDARY=node5.example.com
GANETI_INSTANCE_STATUS=down
GANETI_INSTANCE_VCPUS=1
GANETI_MASTER=node1.example.com
projects / ganeti-local / blobdiff