With Monit you can monitor services and resources of your server easily.
It’s a really cool tool since it also allows you to restart a service if this one goes down, or notify you if the load or memory is getting really high.
Installing
apt-get install monit
edit vim /etc/monit/monitrc, starting from line 118 and uncomment below lines, this will enable monit and the web interface
set httpd port 2812 and use address YOURIPHERE # only accept connection from localhost allow 0.0.0.0/0.0.0.0 # allow anyone to connect allow admin:monit # require user 'admin' with password 'monit'
Then execute to take affect
sudo monit reload
Now you can check the status of monit
monit status
Or access via web to http://YOURIP:2812
The you can start monitoring services and in case they are down monit will raise them again.
In my case I use serverpilot with nginx, php fpm and mysql. This goes in the same config file 😉
check process mysqld with pidfile /var/run/mysqld/mysqld.pid
start program = "/etc/init.d/mysql start"
stop program = "/etc/init.d/mysql stop"
if 2 restarts within 3 cycles then unmonitor
check process nginx-sp with pidfile /var/run/nginx-sp.pid
start program = "/etc/init.d/nginx-sp start"
stop program = "/etc/init.d/nginx-sp stop"
if 2 restarts within 3 cycles then unmonitor
check process php7.0-fpm-sp with pidfile /var/run/php7.0-fpm-sp.pid
start program = "/etc/init.d/php7.0-fpm-sp start"
stop program = "/etc/init.d/php7.0-fpm-sp stop"
if 2 restarts within 3 cycles then unmonitor
And lastly setup your mail server so you can get alerts:
set alert YOURMAIL@gmail.com
set mailserver smtp.elasticemail.com port 2525
username "user" password "passwd"
Once you have set up the configuration, check the syntax:
monit -t
After resolving any possible syntax errors, you can start running all of the monitored programs.
monit start all
Lot of this thanks to this guide.