new options -nodes ALL

[zabojcaspamu]

This option "-n ALL" show if only on node is down (without list nodes in parameters)

[barryib]

@zabojcaspamu thanks for your PR.

nodes is not a required argument. When it's not given, check will be done on all nodes. So I think that you can get what you want by doing something like this:

Assume that you have a cluster of 3 nodes,

check_rabbitmq_cluster -H rabbit.example.com -w 3: -c 3:

This will rise alert if you have less than 3 nodes. See nagios threshold format for detail.

[zabojcaspamu]

You are right when number nodes is constant
What If i will change the number of nodes in the cluster ? I will have to change numbers in check.