Method for monitoring metastat over multiple machines
- From: "D G Teed" <donald.teed@xxxxxxxxx>
- Date: Wed, 19 Dec 2007 09:25:45 -0400
Yesterday I came up with a method for monitoring meta RAID
devices for possible failures from one central script.
On each Solaris machine running software RAID, I've made a small
script to look for metastat status terms indicating a problem.
This is /usr/local/sbin/metacomplain on each solaris host:
#!/bin/sh
/usr/sbin/metastat | /usr/bin/egrep -i 'maintenance|erred'
If there are no status like maintenance or erred, the output is quiet.
The next step was to make a user "metatest" which had this script as its
/etc/passwd shell on each Solaris host. I gave this user a consistent
password on each machine.
metatest:x:1004:1::/home/metatest:/usr/local/sbin/metacomplain
This allows for the check to run merely by ssh into it, while
keeping the account's ability narrow (preferable when the password
is hardwired into a script). I tested scp and sftp with this
user set up and they are unable to do anything (good).
Using a for loop, with expect for providing the password (handled
by /usr/local/bin/respondpw), one script can check the status of all
Solaris hosts. This is set up on a Linux host :
/usr/local/bin/checkmetastat:
#!/bin/bash
for systems in host1 host2 host3 host4 host5 host6 host7 host8 host9
do
/usr/local/bin/respondpw metatest@$systems pass-secret | egrep
-i 'maintenance|erred'
problem=?$
if [ "$problem" = "1" ]
then
echo "metastat error (software RAID) is found in $systems"
else
echo "$systems is OK for metastat check (software RAID)"
fi
echo " "
done
/usr/local/bin/respondpw:
#!/usr/bin/expect -f
# wrapper to make ssh command not require password
# username is passed as 1st arg, passwd as 2nd, command is third
set password [lindex $argv 1]
spawn ssh [lindex $argv 0] [lindex $argv 2]
expect "*assword:"
send "$password\r"
expect eof
So that is my contribution to the Solaris community if anyone likes it.
I'm sure it could be modified into a nagios script, but I think
cron can do this check often enough.
If there things anyone would suggest in improving it, I welcome
comments and criticism. I know my code isn't the most terse
and efficient, but I prefer making it easier for junior admins
to understand if they need to make modifications.
--Donald
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