I need some help understanding the check_cluster plugin, please. I'm
using version 1.4.13 of the plugins on Nagios 3.10, all compiled from
source on 64-bit CentOS 5.2. We use VMWare ESX clusters, and I'd like
the hosts in Nagios that happen to be virtual machines to have one
parent instead of a list of parents comprising every ESX host in the
cluster. Recently, an ESX host was moved from one cluster to another,
so I had to change a lot of parents. If there's a better way to
represent VMs and their hosts, I'm open to suggestions too.
I don't have any problem running it as the Nagios user from the command
line and feeding it states, like so:
./check_cluster --host --data=0,0,2,1 --warning=0 --critical=1
CLUSTER CRITICAL: Host cluster: 2 up, 1 down, 1 unreachable
./check_cluster --host --data=0,0,0,0 --warning=0 --critical=1
CLUSTER OK: Host cluster: 4 up, 0 down, 0 unreachable
./check_cluster --host --data=0,0,0,1 --warning=0 --critical=1
CLUSTER WARNING: Host cluster: 3 up, 1 down, 0 unreachable
Adding --verbose just says "check_cluster - Warning: start=0 end=0;
Critical: start=0 end=1" first.
However, if I try anything with the $HOSTSTATEID$ macro, everything is
always OK, even if I just make up host names:
[./check_cluster --host
--data=$HOSTSTATEID:duck$,$HOSTSTATEID:cow$,$HOSTSTATEID:chicken$
--warning=0 --critical=1
CLUSTER OK: Host cluster: 3 up, 0 down, 0 unreachable
I thought maybe macros work better when executed by Nagios, so I added
check_host_cluster command a host with that as its check_command.
define command {
command_name check_host_cluster
command_line $USER1$/check_cluster --host --label=$HOSTNAME$
--warning=$ARG1$ --critical=$ARG2$ --data=$ARG3$
}
define host {
use linux-server
host_name ProductionCluster1
alias Production Cluster 1
address 127.0.0.1
parents gisesx1,gisesx3,gisesx4
check_command
check_host_cluster!1!2!$HOSTSTATEID:foo1$,$HOSTSTATEID:foo3$,$HOSTSTATEI
D:foo4$
hostgroups nogsupport
}
The check_interval for the linux-server template is set to 3. I made
the assumption that it didn't matter what I set the address to since I'm
only interested in the state of other hosts, and it's not being
referenced in the check_command.
It shows up in the host information web page as being up, but I don't
have any hosts named foo:
Host Status:
UP
(for 0d 3h 41m 9s+)
Status Information: CLUSTER OK: ProductionCluster1: 3 up, 0
down, 0 unreachable
I had better luck with check_icmp, but it looks like it goes straight to
CRITICAL if one host is down.
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