Package ganeti :: Package cmdlib :: Module instance_migration :: Class TLMigrateInstance

Class TLMigrateInstance

Tasklet class for instance migration.

Instance Methods

__init__(self, lu, instance_name, cleanup, failover, fallback, ignore_consistency, allow_runtime_changes, shutdown_timeout, ignore_ipolicy)
Initializes this class.

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CheckPrereq(self)
Check prerequisites.

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_RunAllocator(self)
Run the allocator based on input opcode.

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_WaitUntilSync(self)
Poll with custom rpc for disk sync.

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_EnsureSecondary(self, node)
Demote a node to secondary.

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_GoStandalone(self)
Disconnect from the network.

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_GoReconnect(self, multimaster)
Reconnect to the network.

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_ExecCleanup(self)
Try to cleanup after a failed migration.

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_RevertDiskStatus(self)
Try to revert the disk status after a failed migration.

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_AbortMigration(self)
Call the hypervisor code to abort a started migration.

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_ExecMigration(self)
Migrate an instance.

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_ExecFailover(self)
Failover an instance.

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Exec(self, feedback_fn)
Perform the migration.

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Class Variables

[hide private]

_MIGRATION_POLL_INTERVAL = 1

_MIGRATION_FEEDBACK_INTERVAL = 10

Instance Variables

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boolean

cleanup
Wheater we cleanup from a failed migration

boolean

failover
Whether operation results in failover or migration

boolean

fallback
Whether fallback to failover is allowed if migration not possible

string

iallocator
The iallocator used to determine target_node

boolean

ignore_consistency
Wheter we should ignore consistency between source and target node

bool

ignore_ipolicy
If true, we can ignore instance policy when migrating

boolean

live
whether the migration will be done live or non-live; this variable is initalized only after CheckPrereq has run

int

shutdown_timeout
In case of failover timeout of the shutdown

string

target_node
If given, the target_node to reallocate the instance to

Method Details

[hide private]

init(self, lu, instance_name, cleanup, failover, fallback, ignore_consistency, allow_runtime_changes, shutdown_timeout, ignore_ipolicy)
(Constructor)

source code

Initializes this class.

Overrides: base.Tasklet.__init__

CheckPrereq(self)

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Check prerequisites.

This checks that the instance is in the cluster.

Overrides: base.Tasklet.CheckPrereq

_WaitUntilSync(self)

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Poll with custom rpc for disk sync.

This uses our own step-based rpc call.

_ExecCleanup(self)

source code

Try to cleanup after a failed migration.

The cleanup is done by:

check that the instance is running only on one node (and update the config if needed)
change disks on its secondary node to secondary
wait until disks are fully synchronized
disconnect from the network
change disks into single-master mode
wait again until disks are fully synchronized