[Bug 1312507] Re: rabbitmq-server fails to start on a IPv6-Only environment/epmd is not IPv6 enabled

[Thiago Martins]

For some reason, one of controllers (small isolated region that I have
for tests in lab), it still doesn't work... I'll investigate it more.

Version "1:16.b.3-dfsg-1ubuntu2.1":

---
root at controller-1:~# dpkg -l | grep erlang-base
ii  erlang-base                      1:16.b.3-dfsg-1ubuntu2.1      amd64        Erlang/OTP virtual machine and base applications

root at controller-1:~# service rabbitmq-server restart
 * Restarting message broker rabbitmq-server
   ...fail!
---

Then, I removed the IPv6 "nameservers" entries out from
/etc/resolv.conf...:

---
root at controller-1:~# service rabbitmq-server restart
 * Restarting message broker rabbitmq-server
   ...done.
---

It seems that there are still something wrong with it...

I'll post it here if I can figure it out.

Best,
Thiago

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https://bugs.launchpad.net/bugs/1312507

Title:
  rabbitmq-server fails to start on a IPv6-Only environment/epmd is not
  IPv6 enabled

Status in “erlang” package in Ubuntu:
  Fix Released
Status in “rabbitmq-server” package in Ubuntu:
  Invalid
Status in “erlang” source package in Trusty:
  Fix Released
Status in “rabbitmq-server” source package in Trusty:
  Invalid
Status in “erlang” source package in Utopic:
  Fix Released
Status in “rabbitmq-server” source package in Utopic:
  Invalid

Bug description:
  [Impact]
  Users of RabbitMQ in IPv6 environments are unable to stop/start/restart rabbitmq.

  [Test Case]
  On and IPv6 only server:
  sudo apt-get install rabbitmq-server
  ...
   * Starting message broker rabbitmq-server
   * FAILED - check /var/log/rabbitmq/startup_\{log, _err\}
     ...fail!

  [Regression Potential]
  The fix for this issue is in erlang itself; enabling IPv6 support in epmd is a compile time option so there is scope for regression.  Testing should ensure that existing IPv4 deployments of erlang tools do not regress with this change (validated RMQ already against PPA packages).

  [Original Bug Report]
  Guys,

  I'm trying to install rabbitmq-server on Ubuntu 14.04 on a IPv6-Only
  network and it fails, look:

  ---
  root at server-1:~# apt-get -f install
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  1 not fully installed or removed.
  After this operation, 0 B of additional disk space will be used.
  Setting up rabbitmq-server (3.2.4-1) ...
   * Starting message broker rabbitmq-server
   * FAILED - check /var/log/rabbitmq/startup_\{log, _err\}
     ...fail!
  invoke-rc.d: initscript rabbitmq-server, action "start" failed.
  dpkg: error processing package rabbitmq-server (--configure):
   subprocess installed post-installation script returned error exit status 1
  Errors were encountered while processing:
   rabbitmq-server
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  ---

  The log:
  ---
  root at server-1:~# cat /var/log/rabbitmq/startup_log
  ERROR: epmd error for host "server-1": address (cannot connect to host/port)
  ---

  The connectivity (resolved via /etc/hosts):

  ---
  root at server-1:~# ping6 server-1
  PING server-1(server-1.domain.com.br) 56 data bytes
  64 bytes from server-1.domain.com.br: icmp_seq=1 ttl=64 time=0.019 ms
  64 bytes from server-1.domain.com.br: icmp_seq=2 ttl=64 time=0.044 ms
  ---

  However, if I comment out the "nameserver 2001:4860:4860::8844"
  entries out from /etc/resolv.conf, then, rabbitmq-server starts! Very
  weird...

  Nothing on /etc/resolv.conf now...:

  ---
  root at server-1:~# apt-get -f install
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  1 not fully installed or removed.
  After this operation, 0 B of additional disk space will be used.
  Setting up rabbitmq-server (3.2.4-1) ...
   * Starting message broker rabbitmq-server
     ...done.
  ---

  I found the following topics about this on the net:

  * Related:

  http://rabbitmq.1065348.n5.nabble.com/Error-starting-rabbitmq-in-IPv6
  -environment-td32001.html

  * Not sure if it is related:

  http://blog.domb.net/?p=290

  http://hg.rabbitmq.com/rabbitmq-erlang-client/rev/7f53561c0c11

  Best!
  Thiago

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