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Live Migration Fails Due to RPC Timeout

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Problem

Attempts to perform a live migration of an instance fail with an error similar to the below on the source host.

ERROR nova.compute.manager Pre live migration failed at fea5e264-bfb1-40cd-b1f0-d247845071af...TRACE nova.compute.manager MessagingTimeout: Timed out waiting for a reply to message ID f1e35e10f7c445e3810a115dc3204a24

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Environment

  • Platform9 Managed OpenStack - All Versions

  • Volume-Backed Storage

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Cause

Attempting a live migration of an instance with multiple attached volumes may fail pre-migration checks due to an RPC timeout.

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Resolution

  1. Increase the default RPC timeout of 60 seconds using an override in /opt/pf9/etc/nova/conf.d/nova_override.conf, as shown here.

[DEFAULT]rpc_response_timeout = 120

  1. Restart the pf9-ostackhost service.

# systemctl restart pf9-ostackhost

  1. Retry the migration operation and further increase the RPC timeout if necessary.

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Additional Information

For more information on Nova configuration options, please refer to the following OpenStack documentation.

Nova (Pike) Configuration Optionsarrow-up-right

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