Tuesday, September 27, 2011

Shell Script To Monitor Mysql.

[root@ 17_johnson]# cat /usr/bin/monitor-mysql
#!/bin/bash

# mysql root/admin username
MUSER="root"
# mysql admin/root password
MPASS="im#secure"
# mysql server hostname
MHOST="localhost"
#Shell script to start MySQL server i.e. path to MySQL daemon start/stop script.
# Debain uses following script, need to setup this according to your UNIX/Linux/BSD OS.
MSTART="/etc/init.d/mysqld start"
# Email ID to send notification
EMAILID="shrikant.lokhande@example.com, lokhande.shrikant@gmail.com"
# path to mail program
MAILCMD="$(which mail)"
# path mysqladmin
MADMIN="$(which mysqladmin)"

#### DO NOT CHANGE anything BELOW ####
MAILMESSAGE="/tmp/mysql.fail.$$"

# see if MySQL server is alive or not
# 2&1 could be better but i would like to keep it simple and easy to
# understand stuff :)
$MADMIN -h $MHOST -u $MUSER -p${MPASS} ping 2>/dev/null 1>/dev/null
if [ $? -ne 0 ]; then
        echo "" >$MAILMESSAGE
        echo "Error: MySQL Server is not running/responding ping request">>$MAILMESSAGE
        echo "Hostname: $(hostname)" >>$MAILMESSAGE
        echo "Date & Time: $(date)" >>$MAILMESSAGE
        # try to start mysql
        $MSTART>/dev/null
        # see if it is started or not
        o=$(ps cax | grep -c ' mysqld$')
        if [ $o -eq 1 ]; then
                sMess="MySQL Server MySQL server successfully restarted"
        else
                sMess="MySQL server FAILED to restart"
        fi
        # Email status too
        echo "Current Status: $sMess" >>$MAILMESSAGE
        echo "" >>$MAILMESSAGE
        echo "*** This email generated by $(basename $0) shell script ***" >>$MAILMESSAGE
        echo "*** Please don't reply this email, this is just notification email ***" >>$MAILMESSAGE
        # send email
        $MAILCMD -s "MySQL server" $EMAILID < $MAILMESSAGE
else # MySQL is running :) and do nothing
        :
fi
# remove file
rm -f $MAILMESSAGE

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