[Bug 1529033] [NEW] Install/start fails when hostname is numeric

[Joseph Santaniello]

Public bug reported:

If a machine has a hostname made up entirely of numbers, install and
start will fail reporting:

ERROR: epmd error for host "1234": badarg (unknown POSIX error)

This can be duplicated:

hostame 1234
echo 127.0.0.1 localhost 1234 > /etc/hosts
apt-get install rabbitmq-server

results in:

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
Processing triggers for ureadahead (0.100.0-16) ...
Errors were encountered while processing:
 rabbitmq-server
E: Sub-process /usr/bin/dpkg returned an error code (1)

But try:

hostname testing
echo 127.0.0.1 testing > /etc/hosts
apt-get install rabbitmq-server

and it works.

I'm not sure if this is a rabbitmq-server "bug" or an epmd (I always
chuckle when I write that...) bug, but it cropped up when installing
rabbitmq-server to play with OpenStack so I figured I'd submit it here.

** Affects: rabbitmq-server (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1529033

Title:
  Install/start fails when hostname is numeric

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