Hi List,
Before we start, check_ssh and check_by_ssh is not a workable solution
for me. I have a special setup in place that needs to run checks over
native ssh since I have a bunch of ssh config options per host and
need to use a proxy from where my nagios server is. So far what I have
found doesn't let me use my ssh config file. My goal is to use ssh to
check for host uptime since that's available on every host.
I wrote a script that is very very basic. It's job is to ssh to a host
to determine if it's up or down. Here's the meat and potatoes of that.
--- checkhost.sh ---
#!/bin/bash
# Purpose: Replacement host alive check for nagios
# on hosts that cannot be directly pinged
# Usage function
usage()
{
cat << EOF
usage: checkhost.sh -H <host>
OPTIONS:
-h Show this message
-H SSH host address
EOF
}
# Variables
SSHPath='/usr/bin/ssh'
# Options menu
while getopts "hH:" OPTION
do
case $OPTION in
h)
usage
exit 1
;;
H)
SSHHost=$OPTARG
;;
?)
usage
exit 1
;;
esac
done
# Make sure the required stuff is here
if [[ -z $SSHHost ]]
then
usage
exit 1
fi
# Connect function
SSHConnect()
{
$SSHPath -q $SSHHost exit
if [[ "$?" -eq 0 ]]
then
echo "Host is reachable"
exit 0
else
echo "Unable to reach host"
exit 2
fi
}
SSHConnect
--- end script ---
When I run this script on my bash shell, it works perfect. When I run
this as a host check in nagios, it fails with (Return code of 255 is
out of bounds).
I've checked to make sure it's not getting prompted to accept the
local host key.
I've checked nagios.debug to make sure the command is parsing correctly
I've checked ssh key permissions
I've changed my ssh code around to return something no matter what and
it works.
At this point, I'd like to blame ssh but I'm not 100% sure on that.
Is there any caveats to run SSH on the native system with ssh keys and
a more than customized ssh config file? Maybe I'm missing a ssh
option? I've tried with and with out -T and -t. I've specifcally
specified my config file along with my ssh keys.
Thanks,
Charlie
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