Update example config to 4.0

[Lithimlin]

Is your feature request related to a problem? Please describe.

A system update just broke my RabbitMQ due to a sudden update to 4.0.
I tried looking for a new example config to see how it changed and how I have to set up my AMQP 0-9-1 (or whether I can use 1.0 as a drop-in replacement), but the example is still for version 3.13.

Sorry if this seems a bit scattered, I'm scrambling to fix our deployment and haven't had time to read up on AMQP 1.0 before.

Describe the solution you'd like

An update of the example config file

Describe alternatives you've considered

No response

Additional context

No response

[lukebakken]

The example configuration file is still applicable to version 4.

[Lithimlin]

See below. The anonymous login / default users config changed to the general auth_mechanism ANONYMOUS

[Lithimlin]

Okay, this was a much easier fix than I thought.
Going through the logs and upgrade notice, I found that only the guest user / anonymous login configuration changed:

## Set the default user name and password used for anonymous connections (when client
## provides no credentials). Anonymous connections are highly discouraged!
##
# mqtt.default_user = guest
# mqtt.default_pass = guest

## Enable anonymous connections. If this is set to false, clients MUST provide
## credentials in order to connect. See also the mqtt.default_user/mqtt.default_pass
## keys. Anonymous connections are highly discouraged!
##
# mqtt.allow_anonymous = true

This is the section that is now broken:
default_user and default_pass are now handled by the anonymous_login_* (see here)

[michaelklishin]

@ansd likely the example file is rabbitmq.conf.example, or at least I don't think we have any others :)

[ansd]

Yes, I deleted the old setting from that file.

FWIW the AMQP 1.0 settings was still documented. I just pushed a commit to main which deletes this one as well: 1245119

[Lithimlin]

@Lithimlin linked to an older version, never mind.

Ah, that's the version that's currently linked in the docs at https://www.rabbitmq.com/docs/configure#config-file
So that's probably the issue. I didn't notice the version tag in the file path

[lukebakken]

Yes, we should absolutely update that link. Thanks for pointing it out.

[ansd]

Yes, thanks! rabbitmq/rabbitmq-website#2081