Is it possible to migrate rabbitmq mnesia data when sever hostname changes ?

[xixiangzouyibian]

Community Support Policy

• I have read RabbitMQ's Community Support Policy

RabbitMQ version used

3.13.5

How is RabbitMQ deployed?

RPM package

Steps to reproduce the behavior in question

When server host name changes, the rabbitmq will be installed as new node name. For example, the sever host name changed from A to B.
It looks the old node: A is no longer to use, and the new node B is created from scratch, which not including the data in the old node.
Do we have the way to migrate data from old node to the new one ?
BTW, rabbitmqctl rename_cluster_name is not meet expectation to change the node name, it only change the cluster name.

[michaelklishin]

You have several options:

• Override node's data directory location. This won't update queue identities in the database but you can re-declare the queues, and if all queues in the system are transient, you won't have anything to update
• Export and import definitions and import them into newly started blank node. This won't migrate the messages but can be good enough
• Finally, the most complex migration option which migrates everything is Blue-Green deployment (it assumes that the original node can be started)

There used to be a command that updated the hostname part of internal queue identities but it was removed because it is not compatible with quorum queues and streams.

[xixiangzouyibian]

Got it. Thanks for comments.