On 1/4/2012 5:11 AM, Jim Avery wrote:
> Another advantage is if you add or remove host servers to the cluster
> you only need to change the one host definition.
>
> You could use check_cluster as the host check for your fake host, then
> its status would be meaningful too. I'll have a go at doing that
> myself when I get a minute.
Yes, that is what you want to do. It's what I did.
First, make sure you've defined all your VM hosts. The check_cluster
command will collate their states to determine the cluster's state.
Then, define a command to check your clusters. This one can check hosts
or services, depending on what you pass for $ARG1$.
-----
define command {
#
# $ARG1$ is either "host" or "service"
#
command_name check_cluster
command_line $USER1$/check_cluster --$ARG1$ --label=$HOSTNAME$
--warning=$ARG2$ --critical=$ARG3$ --data=$ARG4$
}
-----
Next, define a host to represent your cluster. I pass "host" as $ARG1$.
I set a warning if one is not-OK and critical if two or more are
not-OK. I don't recall where I saw the use of the @ and : documented in
defining thresholds, but I seem to recall that without the "or more"
part the check will do something odd when a third VM host goes down.
-----
define host {
use generic-server
host_name cluster_1
alias cluster_1
parents foo1,foo2,foo3,foo4
check_command
check_cluster!host!@1:!@2:!$HOSTSTATEID:foo1$,$HOSTSTATEID:foo2$,$HOSTSTATEID:foo3$,$HOSTSTATEID:foo4$
}
-----
I also define a service check for the cluster so I don't run into
service-less hosts not showing up on Nagios' web pages.
-----
define service {
use standard_service
host_name cluster_1
check_command
check_cluster!service!@1:!@2:!$SERVICESTATEID:foo1:Ping$,$SERVICESTATEID:foo2:Ping$,$SERVICESTATEID:foo3:Ping$,$SERVICESTATEID:foo4:Ping$
}
-----
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