[Bug 1808766] Re: fails to start

[James Page]

Proposal to resolve this issue (as I quite like the way RabbitMQ uses
@'ed units).

Ship @'less and @'ed epmd.{socket|service} units in the erlang packages,
all installed by disable by default.

So epmd does not get started by default; only when another erlang
application expresses and interest in it with a After/Wants clause.

This also avoids races on reboot with apps that optionally start their
own version of epmd if one is not already running.

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https://bugs.launchpad.net/bugs/1808766

Title:
  fails to start

Status in erlang package in Ubuntu:
  New
Status in rabbitmq-server package in Ubuntu:
  Confirmed

Bug description:
  The manila test results are not at all happy on s390x:

  http://autopkgtest.ubuntu.com/packages/m/manila/disco/s390x

  This turns out to be because rabbitmq-server is failing to start:

  Job for rabbitmq-server.service failed because the control process exited with error code.
  See "systemctl status rabbitmq-server.service" and "journalctl -xe" for details.
  invoke-rc.d: initscript rabbitmq-server, action "start" failed.
  ● rabbitmq-server.service - RabbitMQ Messaging Server
     Loaded: loaded (]8;;file://autopkgtest/lib/systemd/system/rabbitmq-server.service/lib/systemd/system/rabbitmq-server.service]8;;; enabled; vendor preset: enabled)
     Active: activating (auto-restart) (Result: exit-code) since Sun 2018-12-16 23:04:30 UTC; 18ms ago
    Process: 6376 ExecStart=/usr/sbin/rabbitmq-server (code=exited, status=1/FAILURE)
   Main PID: 6376 (code=exited, status=1/FAILURE)

  Dec 16 23:04:30 autopkgtest systemd[1]: rabbitmq-server.service: Main process exited, code=exited, status=1/FAILURE
  Dec 16 23:04:30 autopkgtest systemd[1]: rabbitmq-server.service: Failed with result 'exit-code'.
  Dec 16 23:04:30 autopkgtest systemd[1]: Failed to start RabbitMQ Messaging Server.
  dpkg: error processing package rabbitmq-server (--configure):
   installed rabbitmq-server package post-installation script subprocess returned error exit status 1

  I got cpaelzer to try on a non-autopkgtest machine with the same
  result.

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