ganeti.cmdlib.base.Tasklet

class documentation

class Tasklet(object):

Known subclasses: ganeti.cmdlib.instance_migration.TLMigrateInstance, ganeti.cmdlib.instance_storage.TLReplaceDisks

Tasklet base class.

Tasklets are subcomponents for LUs. LUs can consist entirely of tasklets or they can mix legacy code with tasklets. Locking needs to be done in the LU, tasklets know nothing about locks.

Subclasses must follow these rules:

Implement CheckPrereq
Implement Exec

Method	`__init__`	Undocumented
Method	`CheckPrereq`	Check prerequisites for this tasklets.
Method	`Exec`	Execute the tasklet.
Instance Variable	`cfg`	Undocumented
Instance Variable	`lu`	Undocumented
Instance Variable	`rpc`	Undocumented

def __init__(self, lu): ¶

overridden in ganeti.cmdlib.instance_migration.TLMigrateInstance, ganeti.cmdlib.instance_storage.TLReplaceDisks

Undocumented

def CheckPrereq(self): ¶

overridden in ganeti.cmdlib.instance_migration.TLMigrateInstance, ganeti.cmdlib.instance_storage.TLReplaceDisks

Check prerequisites for this tasklets.

This method should check whether the prerequisites for the execution of this tasklet are fulfilled. It can do internode communication, but it should be idempotent - no cluster or system changes are allowed.

The method should raise errors.OpPrereqError in case something is not fulfilled. Its return value is ignored.

This method should also update all parameters to their canonical form if it hasn't been done before.

def Exec(self, feedback_fn): ¶

overridden in ganeti.cmdlib.instance_migration.TLMigrateInstance, ganeti.cmdlib.instance_storage.TLReplaceDisks

Execute the tasklet.

This method should implement the actual work. It should raise errors.OpExecError for failures that are somewhat dealt with in code, or expected.

cfg = ¶

Undocumented

lu = ¶

Undocumented

rpc = ¶

Undocumented