Question regarding the advanced.config file format

[ghost]

Hi, I already posted this question via slack, but figured, it might be better suited here for asynchronous discussion:

I'm currently implementing the automatic generation of the advanced.config file for usage in openstack project kolla-ansible
my current patch generates an advanced.config which looks like this, and I couldn't find any documentation what the error is, so any pointers would be appreciated:

cat zuul-logs/primary/logs/kolla_configs/rabbitmq/advanced.config
{kernel, [
  {inet_dist_use_interface, {192,0,2,1}},
  {inet_dist_listen_min, 25672},
  {inet_dist_listen_max, 25672}
]}

What is the problem here?
Are the curly braces surrounding the IP valid? the erlang docs are somewhat ambiguous around this topic.
If you are curious, the python/ansible code for generating the config is located here:
https://review.opendev.org/c/openstack/kolla-ansible/+/758576

PS: Notice that the objective is currently to only make rabbitmq listen on specific ip addresses and to make it work for ipv4 and ipv6.

I found these related erlang docs, which explain the format (somewhat):

https://www.erlang.org/doc/man/inet.html

according to https://www.erlang.org/doc/man/inet.html#type-ip_address

an ipv{4,6} address can be enclosed in curly braces, or am I misreading the syntax definition?

is something else missing? I checked with the provided advanced.config example and maybe I didn't see it, but I don't know which parts of it are required or optional.

If you need more logs or config files, these are linked from the above code review, but I also saved them to my local machine.

PPS: This is the crash dump according to the docker logs:

2022-02-17T14:31:11.638069718Z Running command: '/usr/sbin/rabbitmq-server'
2022-02-17T14:31:13.336833958Z 2022-02-17 14:31:13.319206+00:00 [erro] <0.130.0> Failed to load advanced configuration file "/etc/rabbitmq/advanced.config": 5: syntax error before:
2022-02-17T14:31:13.339637574Z 
2022-02-17T14:31:13.339813953Z BOOT FAILED
2022-02-17T14:31:13.339882104Z 2022-02-17 14:31:13.339339+00:00 [erro] <0.130.0> 
2022-02-17T14:31:13.339895335Z 2022-02-17 14:31:13.339339+00:00 [erro] <0.130.0> BOOT FAILED
2022-02-17T14:31:13.339903135Z 2022-02-17 14:31:13.339339+00:00 [erro] <0.130.0> ===========
2022-02-17T14:31:13.339907280Z 2022-02-17 14:31:13.339339+00:00 [erro] <0.130.0> Error during startup: {error,failed_to_read_advanced_configuration_file}
2022-02-17T14:31:13.339911686Z 2022-02-17 14:31:13.339339+00:00 [erro] <0.130.0> 
2022-02-17T14:31:13.340033744Z ===========
2022-02-17T14:31:13.340185248Z Error during startup: {error,failed_to_read_advanced_configuration_file}
2022-02-17T14:31:13.340284094Z 
2022-02-17T14:31:14.348088857Z 2022-02-17 14:31:14.347130+00:00 [erro] <0.130.0>     supervisor: {local,rabbit_prelaunch_sup}
2022-02-17T14:31:14.348127429Z 2022-02-17 14:31:14.347130+00:00 [erro] <0.130.0>     errorContext: start_error
2022-02-17T14:31:14.348132431Z 2022-02-17 14:31:14.347130+00:00 [erro] <0.130.0>     reason: failed_to_read_advanced_configuration_file
2022-02-17T14:31:14.348136783Z 2022-02-17 14:31:14.347130+00:00 [erro] <0.130.0>     offender: [{pid,undefined},
2022-02-17T14:31:14.348140871Z 2022-02-17 14:31:14.347130+00:00 [erro] <0.130.0>                {id,prelaunch},
2022-02-17T14:31:14.348144894Z 2022-02-17 14:31:14.347130+00:00 [erro] <0.130.0>                {mfargs,{rabbit_prelaunch,run_prelaunch_first_phase,[]}},
2022-02-17T14:31:14.348149124Z 2022-02-17 14:31:14.347130+00:00 [erro] <0.130.0>                {restart_type,transient},
2022-02-17T14:31:14.348152981Z 2022-02-17 14:31:14.347130+00:00 [erro] <0.130.0>                {significant,false},
2022-02-17T14:31:14.348156789Z 2022-02-17 14:31:14.347130+00:00 [erro] <0.130.0>                {shutdown,5000},
2022-02-17T14:31:14.348160609Z 2022-02-17 14:31:14.347130+00:00 [erro] <0.130.0>                {child_type,worker}]
2022-02-17T14:31:14.348187985Z 2022-02-17 14:31:14.347130+00:00 [erro] <0.130.0> 
2022-02-17T14:31:14.359977876Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>   crasher:
2022-02-17T14:31:14.360007056Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     initial call: application_master:init/4
2022-02-17T14:31:14.360011496Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     pid: <0.128.0>
2022-02-17T14:31:14.360015305Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     registered_name: []
2022-02-17T14:31:14.360018824Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     exception exit: {{shutdown,
2022-02-17T14:31:14.360022455Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>                          {failed_to_start_child,prelaunch,
2022-02-17T14:31:14.360025968Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>                              failed_to_read_advanced_configuration_file}},
2022-02-17T14:31:14.360029608Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>                      {rabbit_prelaunch_app,start,[normal,[]]}}
2022-02-17T14:31:14.360033177Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>       in function  application_master:init/4 (application_master.erl, line 142)
2022-02-17T14:31:14.360036907Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     ancestors: [<0.127.0>]
2022-02-17T14:31:14.360040438Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     message_queue_len: 1
2022-02-17T14:31:14.360044099Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     messages: [{'EXIT',<0.129.0>,normal}]
2022-02-17T14:31:14.360047617Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     links: [<0.127.0>,<0.44.0>]
2022-02-17T14:31:14.360051403Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     dictionary: []
2022-02-17T14:31:14.360054824Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     trap_exit: true
2022-02-17T14:31:14.360058347Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     status: running
2022-02-17T14:31:14.360062211Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     heap_size: 376
2022-02-17T14:31:14.360065717Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     stack_size: 29
2022-02-17T14:31:14.360069061Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>     reductions: 167
2022-02-17T14:31:14.360072574Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0>   neighbours:
2022-02-17T14:31:14.360075996Z 2022-02-17 14:31:14.348163+00:00 [erro] <0.128.0> 
2022-02-17T14:31:14.360165506Z 2022-02-17 14:31:14.359571+00:00 [noti] <0.44.0> Application rabbitmq_prelaunch exited with reason: {{shutdown,{failed_to_start_child,prelaunch,failed_to_read_advanced_configuration_file}},{rabbit_prelaunch_app,start,[normal,[]]}}
2022-02-17T14:31:15.888074324Z {"Kernel pid terminated",application_controller,"{application_start_failure,rabbitmq_prelaunch,{{shutdown,{failed_to_start_child,prelaunch,failed_to_read_advanced_configuration_file}},{rabbit_prelaunch_app,start,[normal,[]]}}}"}
2022-02-17T14:31:15.898655787Z Kernel pid terminated (application_controller) ({application_start_failure,rabbitmq_prelaunch,{{shutdown,{failed_to_start_child,prelaunch,failed_to_read_advanced_configuration_file}},{rabbit_prelaunch_app,start,[normal,[]]}}})
2022-02-17T14:31:15.901572985Z 
2022-02-17T14:31:16.030655534Z Crash dump is being written to: erl_crash.dump...done

[lukebakken]

This is the correct format. Note the addition of an outer [].

[
    {kernel, [
        {inet_dist_use_interface, {192,0,2,1}},
        {inet_dist_listen_min, 25672},
        {inet_dist_listen_max, 25672}
    ]}
].

The file must be readable by file:consult/1.

Also, see the example advanced.config here -

https://github.com/rabbitmq/rabbitmq-server/blob/master/deps/rabbit/docs/advanced.config.example

[ghost]

Thank you so much! Apparently it was getting late and I did not spot that simple mistake.