| check process mysqld with pidfile /var/lib/mysql/ns388683.pid |
| start program = “/etc/init.d/mysql start” |
| stop program = “/etc/init.d/mysql stop” |
| if failed host 127.0.0.1 port 3306 then restart |
| if 5 restarts within 5 cycles then timeout |
| check process nginx with pidfile /opt/nginx/logs/nginx.pid |
| start program = “/etc/init.d/nginx start” |
| stop program = “/etc/init.d/nginx stop” |
| if failed host 127.0.0.1 port 80 then restart |
| if cpu is greater than 40% for 2 cycles then alert |
| if cpu > 60% for 5 cycles then restart |
| if 10 restarts within 10 cycles then timeout |
| check process redis with pidfile /var/run/redis.pid |
| start program = “/etc/init.d/redis-server start” |
| stop program = “/etc/init.d/redis-server stop” |
| check file dump.rdb with path /var/lib/redis/dump.rdb |
| if size > 100 MB then alert |
| check process tomcat with pidfile /var/run/tomcat/tomcat.pid |
| start program = “/etc/init.d/tomcat start” |
| stop program = “/etc/init.d/tomcat stop” |
| if failed port 8080 then alert |
| if failed port 8080 for 5 cycles then restart |
Now for the tomcat part – this is based on tomcat being in /usr/local/tomcat where our typical setup script puts everything.
Tomcat, method a (recomended):
Simply run the below snippet to enable monit monitoring of tomcat. This method requires the least work and changes to configurations. Typically monit prefers a bid file to monitor a service as described in method b, but this way works just as well so long as the http port connector is enabled.
echo “check host tomcat with address localhost
stop program = “/etc/init.d/tomcat stop”
start program = “/etc/init.d/tomcat restart”
if failed port 8080 and protocol http
then start
” > /etc/monit.d/tomcat
/etc/init.d/monit restart
Tomcat, method b:
Use this method if you dont have a suitable http connector enabled for your tomcat instance, but be aware that pid files can be left in an inconsistent state in some cases. Which may then require manual intervention anyway. Add a tomcat instance into your config for monit that looks like this (change gid/uid tomcat runs )
check process tomcat with pidfile “/var/run/tomcat/tomcat.pid”
start program = “/usr/local/tomcat/bin/startup.sh”
as uid tomcat gid tomcat
stop program = “/usr/local/tomcat/bin/shutdown.sh”
as uid tomcat gid tomcat
if failed port 8080 then alert
if failed port 8080 for 5 cycles then restart
Then edit your catalina.sh and set
CATALINA_PID to be /var/run/tomcat/tomcat.pid
JAVA_HOME=/usr/java/jdk
Add in at the top
Then of course create the pid directory
mkdir /var/run/tomcat/
chown tomcat.tomcat /var/run/tomcat/
MySQL
Add this to your my.cnf under [mysqld]
pid-file=/var/run/mysqld/mysqld.pid
and this to your monit config
check process mysql with pidfile /var/run/mysqld/mysqld.pid
group database
start program = “/etc/init.d/mysql start”
stop program = “/etc/init.d/mysql stop”
if failed host 127.0.0.1 port 3306 protocol mysql then restart
if 5 restarts within 5 cycles then timeout
depends on mysql_rc
check file mysql_rc with path /etc/init.d/mysql
group database
if failed checksum then unmonitor
if failed permission 755 then unmonitor
if failed uid root then unmonitor
if failed gid root then unmonitor
Disk Space
Add the following to your monit config
check filesystem with path /dev/xvda1
if space usage > 95% then alert
if inode usage > 95% then alert
SSH
Add this to your monit config (change the port if yours is different)
check process sshd with pidfile /var/run/sshd.pid
start program “/etc/init.d/sshd start”
stop program “/etc/init.d/sshd stop”
if failed port 22 protocol ssh then restart
if 5 restarts within 5 cycles then timeout
Shell script
if failed port 443 protocol https request / with timeout 5 seconds for 2 cycles then exec "/var/lib/monit/scripts/notifyAndExecute.sh" else if succeeded then exec "/etc/monit/pagerduty-resolve authentication"
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