Monitor and auto-start Linux Services with a auto-mon Script

Greetings,

I have written a small and very basic script to keep our Linux services up and running. The script is very easy and customisable according to your requirements.

Currently, I have customised it according to my requirement but you can customise it as well.

The script will basically check for services running, that’s what you have defined and once you put your job in cron it will check and if the services are down then it will automatically start the services. I have added log as well so that it will log the time and date of which services was started.

I have added in github just incase you want to help me modify it in future https://github.com/metalaarif/auto-mon

1. Once you run the script it will create a log file in /var/log/ as auto-mon.log
2. Create a cron job and set it as */3 * * * * root /path of the file/auto-mon.sh > /dev/null 2>&1
3. Great that’s it, here’s the script.

#/bin/bash
# Written by metal
root_id=0
log=”/var/log/auto-mon.log”
date=`date`
num_service=`lsof -nPi | grep “LISTEN” | awk ‘{print $9}’ | cut -d: -f2 | sort -u | wc -l` # This is to search for number of running services
pgrep=”/usr/bin/pgrep” # pgrep will be used to search for PID
service=”/sbin/service” # This is to run system V init script
apache_start=”$service httpd start” # Apache or HTTPD will start, in debian and ubuntu user apache2 instead of httpd
mysql_start=”$service mysqld start” # mysql will start
ssh_start=”$service sshd start” # ssh will start
varnish_start=”$service varnish start” # varnish server will start
nrpe_start=”$service nrpe start” # nrpe service will start
munin_node_start=”$service munin-node start” # munin node will start
memcached_start=”$service memcached start” # memcachsed will start
tomcat_start=”$service tomcat start” # apache tomcat server will start
postfix_start=”$service postfix start” # it will start postfix server
if [ $UID != $root_id ]; then
echo “You need to be root in order to run this script.”
exit
fi
/bin/touch $log
echo “#################################################################”
echo Currently, it seems like $num_service services are running.
echo “#################################################################”
$pgrep httpd > /dev/null
if [ $? == 0 ]; then
echo “Congrats! Apache Server is Running”
else
echo “Apache Server is down”
$apache_start
logger -s “[$date] Apache Server was Started..” 2>> $log
fi
$pgrep mysqld > /dev/null
if [ $? == 0 ]; then
echo “Congrats! MySQL Server is Running”
else
echo It looks liks mysql down
$mysql_start
logger -s “[$date] MySQL Server was Started..” 2>> $log
fi
$pgrep sshd > /dev/null
if [ $? == 0 ]; then
echo “Congrats! SSH Server is Running”
else
echo It looks liks ssh down
$ssh_start
logger -s “[$date] SSH Server was Started..” 2>> $log
fi
$pgrep varnishd > /dev/null
if [ $? == 0 ]; then
echo “Congrats! Varnish Server is Running and it has 2 services”
else
echo “varnish server is down”
$varnish_start
logger -s “[$date] Varnish Server was Started..” 2>> $log
fi
$pgrep nrpe > /dev/null
if [ $? == 0 ]; then
echo “Congrats! NRPE Service is Running”
else
echo NRPE is down
$nrpe_start
logger -s “[$date] NRPE Service was Started..” 2>> $log
fi
$pgrep munin-node > /dev/null
if [ $? == 0 ]; then
echo “Congrats! Munin-Node is running”
else
echo munin-node is down
$munin_node_start
logger -s “[$date] Munin-Node was Started..” 2>> $log
fi
$pgrep memcached > /dev/null
if [ $? == 0 ]; then
echo “Congrats! Memcached Server is Running”
else
echo memcached server is down
$memcached_start
logger -s “[$date] Memcached Server was Started..” 2>> $log
fi
$pgrep java > /dev/null # it is infact tomcat but it requires java to work
if [ $? == 0 ]; then
echo “Congrats! Tomcat Server is Running and it has 3 services”
else
echo Tomcat server is down
$tomcat_start
logger -s “[$date] Tomcat Server was Started” 2>> $log
fi
$pgrep master > /dev/null # Postfix server is known as master
if [ $? == 0 ]; then
echo “Congrats! Postfix (SMTP) Server is Running”
else
echo “Postfix Server is down”
$postfix_start
logger -s “[$date] Postfix Server was Started..” 2>> $log
fi