name rabbitmq nodes with short hostnames (bz1119429)

[jeckersb]

RabbitMQ node names must be short names, not fqdn. For example,
'node1.example.org' is invalid, but 'node1' is valid. This strips off
the domain part of the hostname when creating the cluster node names.

[cwolferh]

+1
Works for me:

# grep node /etc/rabbitmq/*
/etc/rabbitmq/rabbitmq.config:    {cluster_nodes, {['rabbit@c1a1', 'rabbit@c1a2', 'rabbit@c1a3'], disc}},

[jguiditta]

Will this work if lb_backend_server_names is already a short name? for instance if it started 'c1a1'?

[jeckersb]

@jguiditta works -

$nodes = ['node1.example.org', 'node2.example.org']
$short = regsubst($nodes, '\..*', '')
notice ("short=${short}")
$even_shorter = regsubst($short, '\..*', '')
notice ("even_shorter=${even_shorter}")

=>

Notice: Scope(Class[main]): short=node1node2
Notice: Scope(Class[main]): even_shorter=node1node2

[jguiditta]

Awesome, thanks for verifying that for me!