RabbitMQ 3.11.x : Enable Feature Flags using advanced.config or Enviroment Variable on Existing Node of RabbitMQ

[Naseer Pasha R]

Hi Team,

OS : Windows 10

RabbitMQ version used : 3.8.8, 3.9.13, 3.11.x

1. Installed the RabbitMQ 3.8.8 and upgraded to RabbitMQ 3.9.13.
2. Now need to upgrade RabbitMQ 3.9.13 to 3.11.x. I have referred https://www.rabbitmq.com/feature-flags.html.
3. Before upgrade we need to enable the respective feature flags. I have enabled the feature flags using rabbitmqctl enable_feature_flag <name> and this is working successfully.
4. Tried to enable feature flags on the same/existing node using below ways and failed.
    a.advanced.config (config parameter)
    b.Environment variable

Request you to provide the solution to proceed on this using the advanced.config or Environment variable to upgrade RabbitMQ version 3.8.8 -> 3.9.13 to 3.11.0 on the existing node.

[Luke Bakken]

Hello,

Please carefully read the documentation here - https://www.rabbitmq.com/feature-flags.html#how-to-start-new-node-disabled-feature-flags

Notice that it says this:

...enable out-of-the-box when starting a node for the first time

The environment variable and configuration only work when a node has never been started.

You should enable feature flags using "rabbitmqctl enable_feature_flag" as you have been doing.

Also, note that you can't upgrade from 3.9 to 3.11 directly - https://www.rabbitmq.com/upgrade.html#rabbitmq-version-upgradability

Thanks,

Luke