rabbitmq supports IPv4 and IPv6 dual stack

[lanzhiwang]

Deploy rabbitmq with the following configuration

apiVersion: rabbitmq.com/v1beta1
kind: RabbitmqCluster
metadata:
  labels:
    prometheus.io/port: '15692'
    prometheus.io/scrape: 'true'
  name: my-rabbitmq
  namespace: hz-rabbitmq
spec:
  affinity:
    podAntiAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        - labelSelector:
            matchLabels:
              app.kubernetes.io/name: my-rabbitmq
          topologyKey: kubernetes.io/hostname
  image: rabbitmq:3.8.16-management
  override: {}
  persistence:
    storage: 2Gi
    storageClassName: sc-topolvm
  rabbitmq:
    additionalConfig: |-
      listeners.tcp.1 = 0.0.0.0:5672
      listeners.tcp.2 = :::5672
  replicas: 3
  resources:
    limits:
      cpu: '1'
      memory: 2Gi
    requests:
      cpu: '1'
      memory: 2Gi
  service:
    type: ClusterIP
  terminationGracePeriodSeconds: 604800
  tls: {}

pod can already support dual stack

$ kubectl exec -ti my-rabbitmq-server-2 -- ip a
Defaulted container "rabbitmq" out of: rabbitmq, setup-container (init)
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
101: eth0@if102: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1400 qdisc noqueue state UP group default
    link/ether 00:00:00:68:56:a0 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 10.3.0.105/16 brd 10.3.255.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fd00:10:16::69/64 scope global
       valid_lft forever preferred_lft forever
    inet6 fe80::200:ff:fe68:56a0/64 scope link
       valid_lft forever preferred_lft forever

At this point, the pod cannot start normally

2022-07-21 15:44:29.511 [error] <0.554.0> BOOT FAILED
===========
2022-07-21 15:44:29.511 [error] <0.865.0> Failed to start Ranch listener {acceptor,{0,0,0,0},5672} in ranch_tcp:listen([{cacerts,'...'},{key,'...'},{cert,'...'},{ip,{0,0,0,0}},{port,5672},inet,{backlog,128},{nodelay,true},{linger,{true,0}},{exit_on_close,false}]) for reason eaddrinuse (address already in use)
2022-07-21 15:44:29.511 [info] <0.863.0> supervisor: {<0.863.0>,ranch_listener_sup}, errorContext: start_error, reason: {listen_error,{acceptor,{0,0,0,0},5672},eaddrinuse}, offender: [{pid,undefined},{id,ranch_acceptors_sup},{mfargs,{ranch_acceptors_sup,start_link,[{acceptor,{0,0,0,0},5672},ranch_tcp]}},{restart_type,permanent},{shutdown,infinity},{child_type,supervisor}]
2022-07-21 15:44:29.511 [error] <0.554.0> ===========
Error during startup: {error,
2022-07-21 15:44:29.511 [error] <0.863.0> Supervisor {<0.863.0>,ranch_listener_sup} had child ranch_acceptors_sup started with ranch_acceptors_sup:start_link({acceptor,{0,0,0,0},5672}, ranch_tcp) at undefined exit with reason {listen_error,{acceptor,{0,0,0,0},5672},eaddrinuse} in context start_error
2022-07-21 15:44:29.511 [error] <0.554.0> Error during startup: {error,
                          {could_not_start_listener,"0.0.0.0",5672,
2022-07-21 15:44:29.511 [info] <0.865.0> [{initial_call,{supervisor,ranch_acceptors_sup,['Argument__1']}},{pid,<0.865.0>},{registered_name,[]},{error_info,{exit,{listen_error,{acceptor,{0,0,0,0},5672},eaddrinuse},[{ranch_acceptors_sup,listen_error,5,[{file,"src/ranch_acceptors_sup.erl"},{line,66}]},{supervisor,init,1,[{file,"supervisor.erl"},{line,301}]},{gen_server,init_it,2,[{file,"gen_server.erl"},{line,417}]},{gen_server,init_it,6,[{file,"gen_server.erl"},{line,385}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,226}]}]}},{ancestors,[<0.863.0>,<0.862.0>,rabbit_sup,<0.273.0>]},{message_queue_len,0},{messages,[]},{links,[<0.863.0>]},{dictionary,[{logger,error_logger}]},{trap_exit,true},{status,running},{heap_size,987},{stack_size,28},{reductions,1632}], []
2022-07-21 15:44:29.512 [error] <0.865.0> CRASH REPORT Process <0.865.0> with 0 neighbours exited with reason: {listen_error,{acceptor,{0,0,0,0},5672},eaddrinuse} in ranch_acceptors_sup:listen_error/5 line 66
2022-07-21 15:44:29.512 [error] <0.554.0>                           {could_not_start_listener,"0.0.0.0",5672,
                              eaddrinuse}}
2022-07-21 15:44:29.512 [info] <0.862.0> supervisor: {<0.862.0>,tcp_listener_sup}, errorContext: start_error, reason: {shutdown,{failed_to_start_child,ranch_acceptors_sup,{listen_error,{acceptor,{0,0,0,0},5672},eaddrinuse}}}, offender: [{pid,undefined},{id,{ranch_listener_sup,{acceptor,{0,0,0,0},5672}}},{mfargs,{ranch_listener_sup,start_link,[{acceptor,{0,0,0,0},5672},ranch_tcp,#{connection_type => supervisor,handshake_timeout => 5000,max_connections => infinity,num_acceptors => 10,socket_opts => [{ip,{0,0,0,0}},{port,5672},inet,{backlog,128},{nodelay,true},{linger,{true,0}},{exit_on_close,false}]},rabbit_connection_sup,[]]}},{restart_type,permanent},{shutdown,infinity},{child_type,supervisor}]

2022-07-21 15:44:29.512 [error] <0.554.0>                               eaddrinuse}}
2022-07-21 15:44:29.512 [error] <0.862.0> Supervisor {<0.862.0>,tcp_listener_sup} had child {ranch_listener_sup,{acceptor,{0,0,0,0},5672}} started with ranch_listener_sup:start_link({acceptor,{0,0,0,0},5672}, ranch_tcp, #{connection_type => supervisor,handshake_timeout => 5000,max_connections => infinity,num_acceptors => ...,...}, rabbit_connection_sup, []) at undefined exit with reason {shutdown,{failed_to_start_child,ranch_acceptors_sup,{listen_error,{acceptor,{0,0,0,0},5672},eaddrinuse}}} in context start_error
2022-07-21 15:44:29.512 [error] <0.554.0>

How to configure rabbitmq to support dual stack in k8s