Configure replication listener to use IPv6

[jfroche]

We are using rabbitmq in docker containers with dual stack ipv4 and ipv6 (ipv4 cannot be disabled in docker).

It looks like replication is listening to ipv4 by default:

$ ss -l -n -p
tcp                    LISTEN                  0                       128                                              0.0.0.0:4369                                             0.0.0.0:*                      users:(("epmd",pid=1577398,fd=3))
tcp                    LISTEN                  0                       0                                                0.0.0.0:6004                                             0.0.0.0:*                      users:(("beam.smp",pid=1577227,fd=38))
tcp                    LISTEN                  0                       128                                                    *:5672                                                   *:*                      users:(("beam.smp",pid=1577227,fd=44))
tcp                    LISTEN                  0                       128                                                    *:25672                                                  *:*                      users:(("beam.smp",pid=1577227,fd=17))
tcp                    LISTEN                  0                       128                                                    *:2314                                                   *:*                      users:(("beam.smp",pid=1577227,fd=42))
tcp                    LISTEN                  0                       128                                                    *:5552                                                   *:*                      users:(("beam.smp",pid=1577227,fd=43))
tcp                    LISTEN                  0                       128                                                 [::]:4369                                                [::]:*                      users:(("epmd",pid=1577398,fd=4))
tcp                    LISTEN                  0                       128                                                    *:15672                                                  *:*                      users:(("beam.smp",pid=1577227,fd=41))

Is it possible that, at the moment, there is no listener option which would help us define the inet6 option ?

[lukebakken]

Hello! The fastest way for me to assist you is for you to provide a git repository containing a docker compose project that I can clone and run that contains the exact configuration you're using. I should be able to run docker compose up.

Getting Erlang to work with IPv6 isn't straightforward.

[jfroche]

Hello, I have added here an example running with the same configuration.

Maybe there is a way to tell the replication to use that erl_inetrc inet6 option ?

[mstinsky]

We have an ipv6 only rabbitmq cluster and wanted to test stream queues in an openstack environment.
I am also not sure how to enable the stream replication listeners on ipv6, by default they only bind to 0.0.0.0
Is there any option for ipv6 or are stream queues not supported in ipv6?

[michaelklishin]

@mstinsky please direct your questions to Discussions, and RabbitMQ questions specifically.

Osiris does not support binding specifically to IPv6 for its replication sockets.

There is osiris.replication_transport which can be set in advanced.config. However, it was added to support TLS and only supports two values, tls and tcp, and the IP family socket options are not currently exposed.

It should not be difficult to add a few more socket options but instead of a trivial contribution we get thumbs down and "any news about this".

I guess that's better than insults from people who with a probability of 0.99 use RabbitMQ for free in commercial products, never pay (to support the core team) and never contribute.

[michaelklishin]

@mstinsky according to Erlang's gen_socket documentation, kernel.inet_default_listen_options can be used to override the defaults.

As any other kernel setting, it can be added to advanced.config like so:

[{kernel, [
  {inet_default_listen_options, [
    {ipv6_v6only, true}
  ]}
]}].

I haven't tried it and would rather expose more Osiris options but that's an alternative way to set any TCP socket options the runtime supports.

[michaelklishin]

#177