Abraham,
We have a cluster, and we use Nagios to check all the IP addresses that the
cluster uses using the check_ping command. This will usually tell us when
either of the nodes goes down, because even if the virtual IPs fail over to
the other node, the actual ip for the node that failed won't respond.
If you wanted to be safer, you could set up a check_tcp command on the port
that they use for cluster communication. I couldn't find this in the docs,
but I believe, it's port 22.
Anything beyond that, you'd have to set up some sort of NRPE check that
runs a script to check the zen logs or something else clever in order to
determine whether the cluster is up.
Alex's solution seems a lot more comprehensive, but just in case you have
to use Nagios...
Nat Biggs
Network Analyst
Cedarville University
937-766-4154
On Wed, May 7, 2014 at 8:06 AM, Abraham Macías Paredes <
[email protected]> wrote:
> Hi everybody,
> When you install a ZEN load balancer cluster, you know that if one server
> fails the other server will take care of everything.
>
> But I want to know if there is any way to check that both servers are
> alive and working by using Nagios.
>
> I mean, if one server is down due to a failiure and the other server
> fails, then there are no more servers to keep the system online. So, how
> can I use Nagios to know that one server is working and the other one is
> monitoring the first one?
>
> Thank you very much!
>
>
>
>
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