Upgrade rabbitmq cluster from 3.7.17 to 3.8.30

[金甲虫]

What is the correct order of upgrading rabbitmq cluster from 3.7.17 to 3.8.30?

I still confused after reading this https://www.rabbitmq.com/upgrade.html

As rolling-upgrade only support 3.7.18 and later, I can only do a full stop upgrade.

And rabbitmq 3.8.30 requires erlang 23.2, so I need to upgrade erlang version.

So take a 3-node-cluster as an example, the order of operation will be

1. Stop node 3

2. Stop node 2

3. Stop node 1

4. Uninstall old erlang

5. Install new erlang

6. Unpack new rabbitmq-server to overwrite old rabbitmq-server files

7. Start node 1

8. Start node 2

9. Start node 3

Am I right?

[金甲虫]

I'm using CentOS 7, and erlang version is 22.0.7

[Kendrik Peng]

How about installing the latest version 3.9 for a cluster, copy message cluster by cluster via shovel, then switch the app to the new cluster entirely?

Regards.

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