Package ganeti :: Package cmdlib :: Module group :: Class LUGroupAdd
[hide private]
[frames] | no frames]

Class LUGroupAdd

source code


Logical unit for creating node groups.

Instance Methods [hide private]
 
ExpandNames(self)
Expand names for this LU.
source code
 
_CheckIpolicy(self)
Checks the group's ipolicy for consistency and validity.
source code
 
CheckPrereq(self)
Check prerequisites.
source code
dict
BuildHooksEnv(self)
Build hooks env.
source code
tuple; (list, list) or (list, list, list)
BuildHooksNodes(self)
Build hooks nodes.
source code
 
Exec(self, feedback_fn)
Add the node group to the cluster.
source code

Inherited from base.LogicalUnit: CheckArguments, DeclareLocks, HooksCallBack, __init__

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Class Variables [hide private]
  HPATH = "group-add"
  HTYPE = "GROUP"
  REQ_BGL = False
Instance Variables [hide private]

Inherited from base.LogicalUnit: dry_run_result

Properties [hide private]

Inherited from object: __class__

Method Details [hide private]

ExpandNames(self)

source code 

Expand names for this LU.

This method is called before starting to execute the opcode, and it should update all the parameters of the opcode to their canonical form (e.g. a short node name must be fully expanded after this method has successfully completed). This way locking, hooks, logging, etc. can work correctly.

LUs which implement this method must also populate the self.needed_locks member, as a dict with lock levels as keys, and a list of needed lock names as values. Rules:

  • use an empty dict if you don't need any lock
  • if you don't need any lock at a particular level omit that level (note that in this case DeclareLocks won't be called at all for that level)
  • if you need locks at a level, but you can't calculate it in this function, initialise that level with an empty list and do further processing in LogicalUnit.DeclareLocks (see that function's docstring)
  • don't put anything for the BGL level
  • if you want all locks at a level use locking.ALL_SET as a value

If you need to share locks (rather than acquire them exclusively) at one level you can modify self.share_locks, setting a true value (usually 1) for that level. By default locks are not shared.

This function can also define a list of tasklets, which then will be executed in order instead of the usual LU-level CheckPrereq and Exec functions, if those are not defined by the LU.

Examples:

 # Acquire all nodes and one instance
 self.needed_locks = {
   locking.LEVEL_NODE: locking.ALL_SET,
   locking.LEVEL_INSTANCE: ['instance1.example.com'],
 }
 # Acquire just two nodes
 self.needed_locks = {
   locking.LEVEL_NODE: ['node1-uuid', 'node2-uuid'],
 }
 # Acquire no locks
 self.needed_locks = {} # No, you can't leave it to the default value None
Overrides: base.LogicalUnit.ExpandNames
(inherited documentation)

CheckPrereq(self)

source code 

Check prerequisites.

This checks that the given group name is not an existing node group already.

Overrides: base.LogicalUnit.CheckPrereq

BuildHooksEnv(self)

source code 

Build hooks env.

Returns: dict
Dictionary containing the environment that will be used for running the hooks for this LU. The keys of the dict must not be prefixed with "GANETI_"--that'll be added by the hooks runner. The hooks runner will extend the environment with additional variables. If no environment should be defined, an empty dictionary should be returned (not None).
Overrides: base.LogicalUnit.BuildHooksEnv

BuildHooksNodes(self)

source code 

Build hooks nodes.

Returns: tuple; (list, list) or (list, list, list)
Tuple containing a list of node UUIDs on which the hook should run before the execution and a list of node UUIDs on which the hook should run after the execution. As it might be possible that the node UUID is not known at the time this method is invoked, an optional third list can be added which contains node names on which the hook should run after the execution (in case of node add, for instance). No nodes should be returned as an empty list (and not None).
Overrides: base.LogicalUnit.BuildHooksNodes

Exec(self, feedback_fn)

source code 

Add the node group to the cluster.

Overrides: base.LogicalUnit.Exec