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1
Ganeti customisation using hooks
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================================
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Documents Ganeti version 2.5
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.. contents::
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Introduction
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------------
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In order to allow customisation of operations, ganeti runs scripts
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under ``/etc/ganeti/hooks`` based on certain rules.
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This is similar to the ``/etc/network/`` structure present in Debian
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for network interface handling.
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Organisation
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------------
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For every operation, two sets of scripts are run:
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- pre phase (for authorization/checking)
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- post phase (for logging)
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Also, for each operation, the scripts are run on one or more nodes,
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depending on the operation type.
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Note that, even though we call them scripts, we are actually talking
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about any executable.
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*pre* scripts
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~~~~~~~~~~~~~
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The *pre* scripts have a definite target: to check that the operation
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is allowed given the site-specific constraints. You could have, for
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example, a rule that says every new instance is required to exists in
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a database; to implement this, you could write a script that checks
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the new instance parameters against your database.
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The objective of these scripts should be their return code (zero or
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non-zero for success and failure). However, if they modify the
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environment in any way, they should be idempotent, as failed
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executions could be restarted and thus the script(s) run again with
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exactly the same parameters.
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Note that if a node is unreachable at the time a hooks is run, this
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will not be interpreted as a deny for the execution. In other words,
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only an actual error returned from a script will cause abort, and not
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an unreachable node.
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Therefore, if you want to guarantee that a hook script is run and
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denies an action, it's best to put it on the master node.
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*post* scripts
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~~~~~~~~~~~~~~
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These scripts should do whatever you need as a reaction to the
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completion of an operation. Their return code is not checked (but
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logged), and they should not depend on the fact that the *pre* scripts
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have been run.
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Naming
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~~~~~~
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The allowed names for the scripts consist of (similar to *run-parts*)
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upper and lower case, digits, underscores and hyphens. In other words,
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the regexp ``^[a-zA-Z0-9_-]+$``. Also, non-executable scripts will be
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ignored.
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Order of execution
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~~~~~~~~~~~~~~~~~~
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On a single node, the scripts in a directory are run in lexicographic
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order (more exactly, the python string comparison order). It is
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advisable to implement the usual *NN-name* convention where *NN* is a
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two digit number.
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For an operation whose hooks are run on multiple nodes, there is no
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specific ordering of nodes with regard to hooks execution; you should
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assume that the scripts are run in parallel on the target nodes
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(keeping on each node the above specified ordering).  If you need any
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kind of inter-node synchronisation, you have to implement it yourself
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in the scripts.
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Execution environment
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~~~~~~~~~~~~~~~~~~~~~
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The scripts will be run as follows:
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- no command line arguments
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- no controlling *tty*
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- stdin is actually */dev/null*
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- stdout and stderr are directed to files
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- PATH is reset to ``/sbin:/bin:/usr/sbin:/usr/bin``
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- the environment is cleared, and only ganeti-specific variables will
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  be left
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All information about the cluster is passed using environment
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variables. Different operations will have sligthly different
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environments, but most of the variables are common.
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Operation list
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--------------
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Node operations
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~~~~~~~~~~~~~~~
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OP_NODE_ADD
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+++++++++++
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Adds a node to the cluster.
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:directory: node-add
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:env. vars: NODE_NAME, NODE_PIP, NODE_SIP, MASTER_CAPABLE, VM_CAPABLE
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:pre-execution: all existing nodes
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:post-execution: all nodes plus the new node
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OP_NODE_REMOVE
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++++++++++++++
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Removes a node from the cluster. On the removed node the hooks are
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called during the execution of the operation and not after its
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completion.
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:directory: node-remove
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:env. vars: NODE_NAME
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:pre-execution: all existing nodes except the removed node
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:post-execution: all existing nodes
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OP_NODE_SET_PARAMS
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++++++++++++++++++
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Changes a node's parameters.
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:directory: node-modify
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:env. vars: MASTER_CANDIDATE, OFFLINE, DRAINED, MASTER_CAPABLE, VM_CAPABLE
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:pre-execution: master node, the target node
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:post-execution: master node, the target node
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OP_NODE_EVACUATE
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++++++++++++++++
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Relocate secondary instances from a node.
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:directory: node-evacuate
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:env. vars: NEW_SECONDARY, NODE_NAME
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:pre-execution: master node, target node
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:post-execution: master node, target node
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OP_NODE_MIGRATE
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++++++++++++++++
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Relocate secondary instances from a node.
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:directory: node-migrate
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:env. vars: NODE_NAME
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:pre-execution: master node
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:post-execution: master node
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Node group operations
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~~~~~~~~~~~~~~~~~~~~~
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OP_GROUP_ADD
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++++++++++++
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Adds a node group to the cluster.
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:directory: group-add
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:env. vars: GROUP_NAME
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:pre-execution: master node
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:post-execution: master node
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OP_GROUP_SET_PARAMS
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+++++++++++++++++++
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Changes a node group's parameters.
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:directory: group-modify
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:env. vars: GROUP_NAME, NEW_ALLOC_POLICY
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:pre-execution: master node
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:post-execution: master node
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OP_GROUP_REMOVE
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+++++++++++++++
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Removes a node group from the cluster. Since the node group must be
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empty for removal to succeed, the concept of "nodes in the group" does
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not exist, and the hook is only executed in the master node.
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:directory: group-remove
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:env. vars: GROUP_NAME
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:pre-execution: master node
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:post-execution: master node
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OP_GROUP_RENAME
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+++++++++++++++
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Renames a node group.
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:directory: group-rename
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:env. vars: OLD_NAME, NEW_NAME
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:pre-execution: master node and all nodes in the group
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:post-execution: master node and all nodes in the group
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OP_GROUP_EVACUATE
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+++++++++++++++++
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Evacuates a node group.
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:directory: group-evacuate
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:env. vars: GROUP_NAME, TARGET_GROUPS
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:pre-execution: master node and all nodes in the group
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:post-execution: master node and all nodes in the group
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Instance operations
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~~~~~~~~~~~~~~~~~~~
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All instance operations take at least the following variables:
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INSTANCE_NAME, INSTANCE_PRIMARY, INSTANCE_SECONDARY,
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INSTANCE_OS_TYPE, INSTANCE_DISK_TEMPLATE, INSTANCE_MEMORY,
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INSTANCE_DISK_SIZES, INSTANCE_VCPUS, INSTANCE_NIC_COUNT,
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INSTANCE_NICn_IP, INSTANCE_NICn_BRIDGE, INSTANCE_NICn_MAC,
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INSTANCE_DISK_COUNT, INSTANCE_DISKn_SIZE, INSTANCE_DISKn_MODE.
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The INSTANCE_NICn_* and INSTANCE_DISKn_* variables represent the
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properties of the *n* -th NIC and disk, and are zero-indexed.
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OP_INSTANCE_CREATE
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++++++++++++++++++
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Creates a new instance.
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:directory: instance-add
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:env. vars: ADD_MODE, SRC_NODE, SRC_PATH, SRC_IMAGES
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:pre-execution: master node, primary and secondary nodes
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:post-execution: master node, primary and secondary nodes
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OP_INSTANCE_REINSTALL
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+++++++++++++++++++++
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Reinstalls an instance.
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:directory: instance-reinstall
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:env. vars: only the standard instance vars
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:pre-execution: master node, primary and secondary nodes
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:post-execution: master node, primary and secondary nodes
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OP_BACKUP_EXPORT
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++++++++++++++++
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Exports the instance.
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:directory: instance-export
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:env. vars: EXPORT_MODE, EXPORT_NODE, EXPORT_DO_SHUTDOWN, REMOVE_INSTANCE
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:pre-execution: master node, primary and secondary nodes
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:post-execution: master node, primary and secondary nodes
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OP_INSTANCE_STARTUP
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+++++++++++++++++++
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Starts an instance.
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:directory: instance-start
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:env. vars: FORCE
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:pre-execution: master node, primary and secondary nodes
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:post-execution: master node, primary and secondary nodes
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OP_INSTANCE_SHUTDOWN
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++++++++++++++++++++
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Stops an instance.
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:directory: instance-stop
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:env. vars: TIMEOUT
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:pre-execution: master node, primary and secondary nodes
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:post-execution: master node, primary and secondary nodes
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OP_INSTANCE_REBOOT
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++++++++++++++++++
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Reboots an instance.
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:directory: instance-reboot
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:env. vars: IGNORE_SECONDARIES, REBOOT_TYPE, SHUTDOWN_TIMEOUT
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:pre-execution: master node, primary and secondary nodes
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:post-execution: master node, primary and secondary nodes
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OP_INSTANCE_SET_PARAMS
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++++++++++++++++++++++
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Modifies the instance parameters.
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:directory: instance-modify
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:env. vars: NEW_DISK_TEMPLATE
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:pre-execution: master node, primary and secondary nodes
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:post-execution: master node, primary and secondary nodes
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OP_INSTANCE_FAILOVER
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++++++++++++++++++++
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Failovers an instance. In the post phase INSTANCE_PRIMARY and
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INSTANCE_SECONDARY refer to the nodes that were repectively primary
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and secondary before failover.
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:directory: instance-failover
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:env. vars: IGNORE_CONSISTENCY, SHUTDOWN_TIMEOUT, OLD_PRIMARY, OLD_SECONDARY, NEW_PRIMARY, NEW_SECONDARY
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:pre-execution: master node, secondary node
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:post-execution: master node, primary and secondary nodes
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OP_INSTANCE_MIGRATE
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++++++++++++++++++++
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Migrates an instance. In the post phase INSTANCE_PRIMARY and
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INSTANCE_SECONDARY refer to the nodes that were repectively primary
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and secondary before migration.
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:directory: instance-migrate
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:env. vars: MIGRATE_LIVE, MIGRATE_CLEANUP, OLD_PRIMARY, OLD_SECONDARY, NEW_PRIMARY, NEW_SECONDARY
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:pre-execution: master node, secondary node
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:post-execution: master node, primary and secondary nodes
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OP_INSTANCE_REMOVE
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++++++++++++++++++
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Remove an instance.
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:directory: instance-remove
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:env. vars: SHUTDOWN_TIMEOUT
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:pre-execution: master node
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:post-execution: master node, primary and secondary nodes
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OP_INSTANCE_REPLACE_DISKS
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+++++++++++++++++++++++++
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Replace an instance's disks.
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:directory: mirror-replace
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:env. vars: MODE, NEW_SECONDARY, OLD_SECONDARY
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:pre-execution: master node, primary and secondary nodes
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:post-execution: master node, primary and secondary nodes
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OP_INSTANCE_GROW_DISK
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+++++++++++++++++++++
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Grows the disk of an instance.
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:directory: disk-grow
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:env. vars: DISK, AMOUNT
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:pre-execution: master node, primary and secondary nodes
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:post-execution: master node, primary and secondary nodes
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OP_INSTANCE_RENAME
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++++++++++++++++++
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Renames an instance.
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:directory: instance-rename
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:env. vars: INSTANCE_NEW_NAME
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:pre-execution: master node, primary and secondary nodes
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:post-execution: master node, primary and secondary nodes
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OP_INSTANCE_MOVE
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++++++++++++++++
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Move an instance by data-copying.
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:directory: instance-move
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:env. vars: TARGET_NODE, SHUTDOWN_TIMEOUT
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:pre-execution: master node, primary and target nodes
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:post-execution: master node, primary and target nodes
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OP_INSTANCE_RECREATE_DISKS
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++++++++++++++++++++++++++
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Recreate an instance's missing disks.
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:directory: instance-recreate-disks
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:env. vars: only the standard instance vars
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:pre-execution: master node, primary and secondary nodes
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:post-execution: master node, primary and secondary nodes
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OP_INSTANCE_REPLACE_DISKS
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+++++++++++++++++++++++++
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Replace the disks of an instance.
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:directory: mirrors-replace
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:env. vars: MODE, NEW_SECONDARY, OLD_SECONDARY
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:pre-execution: master node, primary and new secondary nodes
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:post-execution: master node, primary and new secondary nodes
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OP_INSTANCE_CHANGE_GROUP
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++++++++++++++++++++++++
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Moves an instance to another group.
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:directory: instance-change-group
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:env. vars: TARGET_GROUPS
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:pre-execution: master node
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:post-execution: master node
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Cluster operations
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~~~~~~~~~~~~~~~~~~
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OP_CLUSTER_POST_INIT
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++++++++++++++++++++
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This hook is called via a special "empty" LU right after cluster
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initialization.
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:directory: cluster-init
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:env. vars: none
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:pre-execution: none
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:post-execution: master node
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OP_CLUSTER_DESTROY
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++++++++++++++++++
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The post phase of this hook is called during the execution of destroy
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operation and not after its completion.
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:directory: cluster-destroy
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:env. vars: none
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:pre-execution: none
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:post-execution: master node
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OP_CLUSTER_VERIFY_GROUP
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+++++++++++++++++++++++
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Verifies all nodes in a group. This is a special LU with regard to
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hooks, as the result of the opcode will be combined with the result of
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post-execution hooks, in order to allow administrators to enhance the
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cluster verification procedure.
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:directory: cluster-verify
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:env. vars: CLUSTER, MASTER, CLUSTER_TAGS, NODE_TAGS_<name>
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:pre-execution: none
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:post-execution: all nodes in a group
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OP_CLUSTER_RENAME
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+++++++++++++++++
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Renames the cluster.
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:directory: cluster-rename
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:env. vars: NEW_NAME
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:pre-execution: master-node
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:post-execution: master-node
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OP_CLUSTER_SET_PARAMS
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+++++++++++++++++++++
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Modifies the cluster parameters.
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:directory: cluster-modify
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:env. vars: NEW_VG_NAME
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:pre-execution: master node
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:post-execution: master node
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:pyeval:`constants.FAKE_OP_MASTER_TURNUP`
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+++++++++++++++++++++++++++++++++++++++++
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Called when the master IP is activated.
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:directory: master-ip-turnup
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:env. vars: MASTER_NETDEV, MASTER_IP, MASTER_NETMASK, CLUSTER_IP_VERSION
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:pre-execution: master node
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:post-execution: master node
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:pyeval:`constants.FAKE_OP_MASTER_TURNDOWN`
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+++++++++++++++++++++++++++++++++++++++++++
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Called when the master IP is deactivated.
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:directory: master-ip-turndown
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:env. vars: MASTER_NETDEV, MASTER_IP, MASTER_NETMASK, CLUSTER_IP_VERSION
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:pre-execution: master node
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:post-execution: master node
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Obsolete operations
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~~~~~~~~~~~~~~~~~~~
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The following operations are no longer present or don't execute hooks
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anymore in Ganeti 2.0:
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- OP_INIT_CLUSTER
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- OP_MASTER_FAILOVER
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- OP_INSTANCE_ADD_MDDRBD
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- OP_INSTANCE_REMOVE_MDDRBD
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Environment variables
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---------------------
510

    
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Note that all variables listed here are actually prefixed with *GANETI_*
512
in order to provide a clear namespace. In addition, post-execution
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scripts receive another set of variables, prefixed with *GANETI_POST_*,
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representing the status after the opcode executed.
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Common variables
517
~~~~~~~~~~~~~~~~
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This is the list of environment variables supported by all operations:
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HOOKS_VERSION
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  Documents the hooks interface version. In case this doesnt match
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  what the script expects, it should not run. The documents conforms
524
  to the version 2.
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HOOKS_PHASE
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  One of *PRE* or *POST* denoting which phase are we in.
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CLUSTER
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  The cluster name.
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MASTER
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  The master node.
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OP_CODE
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  One of the *OP_* values from the list of operations.
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OBJECT_TYPE
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  One of ``INSTANCE``, ``NODE``, ``CLUSTER``.
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DATA_DIR
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  The path to the Ganeti configuration directory (to read, for
543
  example, the *ssconf* files).
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Specialised variables
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~~~~~~~~~~~~~~~~~~~~~
548

    
549
This is the list of variables which are specific to one or more
550
operations.
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552
CLUSTER_IP_VERSION
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  IP version of the master IP (4 or 6)
554

    
555
INSTANCE_NAME
556
  The name of the instance which is the target of the operation.
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INSTANCE_BE_x,y,z,...
559
  Instance BE params. There is one variable per BE param. For instance, GANETI_INSTANCE_BE_auto_balance
560

    
561
INSTANCE_DISK_TEMPLATE
562
  The disk type for the instance.
563

    
564
NEW_DISK_TEMPLATE
565
  The new disk type for the instance.
566

    
567
INSTANCE_DISK_COUNT
568
  The number of disks for the instance.
569

    
570
INSTANCE_DISKn_SIZE
571
  The size of disk *n* for the instance.
572

    
573
INSTANCE_DISKn_MODE
574
  Either *rw* for a read-write disk or *ro* for a read-only one.
575

    
576
INSTANCE_HV_x,y,z,...
577
  Instance hypervisor options. There is one variable per option. For instance, GANETI_INSTANCE_HV_use_bootloader
578

    
579
INSTANCE_HYPERVISOR
580
  The instance hypervisor.
581

    
582
INSTANCE_NIC_COUNT
583
  The number of NICs for the instance.
584

    
585
INSTANCE_NICn_BRIDGE
586
  The bridge to which the *n* -th NIC of the instance is attached.
587

    
588
INSTANCE_NICn_IP
589
  The IP (if any) of the *n* -th NIC of the instance.
590

    
591
INSTANCE_NICn_MAC
592
  The MAC address of the *n* -th NIC of the instance.
593

    
594
INSTANCE_NICn_MODE
595
  The mode of the *n* -th NIC of the instance.
596

    
597
INSTANCE_OS_TYPE
598
  The name of the instance OS.
599

    
600
INSTANCE_PRIMARY
601
  The name of the node which is the primary for the instance. Note that
602
  for migrations/failovers, you shouldn't rely on this variable since
603
  the nodes change during the exectution, but on the
604
  OLD_PRIMARY/NEW_PRIMARY values.
605

    
606
INSTANCE_SECONDARY
607
  Space-separated list of secondary nodes for the instance. Note that
608
  for migrations/failovers, you shouldn't rely on this variable since
609
  the nodes change during the exectution, but on the
610
  OLD_SECONDARY/NEW_SECONDARY values.
611

    
612
INSTANCE_MEMORY
613
  The memory size (in MiBs) of the instance.
614

    
615
INSTANCE_VCPUS
616
  The number of virtual CPUs for the instance.
617

    
618
INSTANCE_STATUS
619
  The run status of the instance.
620

    
621
MASTER_CAPABLE
622
  Whether a node is capable of being promoted to master.
623

    
624
VM_CAPABLE
625
  Whether the node can host instances.
626

    
627
MASTER_NETDEV
628
  Network device of the master IP
629

    
630
MASTER_IP
631
  The master IP
632

    
633
MASTER_NETMASK
634
  Netmask of the master IP
635

    
636
INSTANCE_TAGS
637
  A space-delimited list of the instance's tags.
638

    
639
NODE_NAME
640
  The target node of this operation (not the node on which the hook
641
  runs).
642

    
643
NODE_PIP
644
  The primary IP of the target node (the one over which inter-node
645
  communication is done).
646

    
647
NODE_SIP
648
  The secondary IP of the target node (the one over which drbd
649
  replication is done). This can be equal to the primary ip, in case
650
  the cluster is not dual-homed.
651

    
652
FORCE
653
  This is provided by some operations when the user gave this flag.
654

    
655
IGNORE_CONSISTENCY
656
  The user has specified this flag. It is used when failing over
657
  instances in case the primary node is down.
658

    
659
ADD_MODE
660
  The mode of the instance create: either *create* for create from
661
  scratch or *import* for restoring from an exported image.
662

    
663
SRC_NODE, SRC_PATH, SRC_IMAGE
664
  In case the instance has been added by import, these variables are
665
  defined and point to the source node, source path (the directory
666
  containing the image and the config file) and the source disk image
667
  file.
668

    
669
NEW_SECONDARY
670
  The name of the node on which the new mirror component is being
671
  added (for replace disk). This can be the name of the current
672
  secondary, if the new mirror is on the same secondary. For
673
  migrations/failovers, this is the old primary node.
674

    
675
OLD_SECONDARY
676
  The name of the old secondary in the replace-disks command. Note that
677
  this can be equal to the new secondary if the secondary node hasn't
678
  actually changed. For migrations/failovers, this is the new primary
679
  node.
680

    
681
OLD_PRIMARY, NEW_PRIMARY
682
  For migrations/failovers, the old and respectively new primary
683
  nodes. These two mirror the NEW_SECONDARY/OLD_SECONDARY variables
684

    
685
EXPORT_MODE
686
  The instance export mode. Either "remote" or "local".
687

    
688
EXPORT_NODE
689
  The node on which the exported image of the instance was done.
690

    
691
EXPORT_DO_SHUTDOWN
692
  This variable tells if the instance has been shutdown or not while
693
  doing the export. In the "was shutdown" case, it's likely that the
694
  filesystem is consistent, whereas in the "did not shutdown" case,
695
  the filesystem would need a check (journal replay or full fsck) in
696
  order to guarantee consistency.
697

    
698
REMOVE_INSTANCE
699
  Whether the instance was removed from the node.
700

    
701
SHUTDOWN_TIMEOUT
702
  Amount of time to wait for the instance to shutdown.
703

    
704
TIMEOUT
705
  Amount of time to wait before aborting the op.
706

    
707
OLD_NAME, NEW_NAME
708
  Old/new name of the node group.
709

    
710
GROUP_NAME
711
  The name of the node group.
712

    
713
NEW_ALLOC_POLICY
714
  The new allocation policy for the node group.
715

    
716
CLUSTER_TAGS
717
  The list of cluster tags, space separated.
718

    
719
NODE_TAGS_<name>
720
  The list of tags for node *<name>*, space separated.
721

    
722
Examples
723
--------
724

    
725
The startup of an instance will pass this environment to the hook
726
script::
727

    
728
  GANETI_CLUSTER=cluster1.example.com
729
  GANETI_DATA_DIR=/var/lib/ganeti
730
  GANETI_FORCE=False
731
  GANETI_HOOKS_PATH=instance-start
732
  GANETI_HOOKS_PHASE=post
733
  GANETI_HOOKS_VERSION=2
734
  GANETI_INSTANCE_DISK0_MODE=rw
735
  GANETI_INSTANCE_DISK0_SIZE=128
736
  GANETI_INSTANCE_DISK_COUNT=1
737
  GANETI_INSTANCE_DISK_TEMPLATE=drbd
738
  GANETI_INSTANCE_MEMORY=128
739
  GANETI_INSTANCE_NAME=instance2.example.com
740
  GANETI_INSTANCE_NIC0_BRIDGE=xen-br0
741
  GANETI_INSTANCE_NIC0_IP=
742
  GANETI_INSTANCE_NIC0_MAC=aa:00:00:a5:91:58
743
  GANETI_INSTANCE_NIC_COUNT=1
744
  GANETI_INSTANCE_OS_TYPE=debootstrap
745
  GANETI_INSTANCE_PRIMARY=node3.example.com
746
  GANETI_INSTANCE_SECONDARY=node5.example.com
747
  GANETI_INSTANCE_STATUS=down
748
  GANETI_INSTANCE_VCPUS=1
749
  GANETI_MASTER=node1.example.com
750
  GANETI_OBJECT_TYPE=INSTANCE
751
  GANETI_OP_CODE=OP_INSTANCE_STARTUP
752
  GANETI_OP_TARGET=instance2.example.com
753

    
754
.. vim: set textwidth=72 :
755
.. Local Variables:
756
.. mode: rst
757
.. fill-column: 72
758
.. End: