Upgrade rabbitmq 3.7.11 > 4.2.2

[Johan Prieur]

Hello,

I have two RabbitMQ servers in a cluster running version 3.7.11 on Windows Server.
If I understand correctly, I cannot perform a Rolling (in‑place) Upgrade to the latest version?

Could you please confirm the actions to take:

• Export configuration to .json
• Stop the RabbitMQ service on the first server
• Upgrade Erlang
• Install RabbitMQ
• Start the service
• Enable the feature flags
• Enable the plugins
• Import the .json configuration file
• Repeat the same operation on the second server

[jo...@cloudamqp.com]

Hi,

It is not impossible to upgrade in-place. You do need a full cluster stop when going from 3.7.x to 3.8.x but after that it can be done in a rolling fashion. That being said it would probably be faster to do a blue-green upgrade: https://www.rabbitmq.com/docs/blue-green-upgrade

/Johan

[jo...@cloudamqp.com]

I forgot to mentioned that two-node clusters are "highly recommended against": https://www.rabbitmq.com/docs/clustering#node-count

/Johan