Monit is a monitoring software that will monitor running services, restart if service stop responding, notify you by email.

Installing Monit on Ubuntu

apt-get install monit

Start monit

On Ubuntu, run

service monit start

Enable Web Interface

Edit /etc/monit/monitrc

vi /etc/monit/monitrc 

Find

# set httpd port 2812 and
#     use address localhost  # only accept connection from localhost
#     allow localhost        # allow localhost to connect to the server and
#     allow admin:monit      # require user 'admin' with password 'monit'

Replace with

set httpd port 2812 and
#     use address localhost  # only accept connection from localhost
#     allow localhost        # allow localhost to connect to the server and
     allow admin:monit      # require user 'admin' with password 'monit'

Set a password.

Restart monit with

service monit restart

Now you will be able to access monit interface with URL

http://your-server-ip:2812

Monitoring Service

To monitor service nginx, create file

vi /etc/monit/conf-available/nginx

Add following content

check process nginx with pidfile /var/run/nginx.pid
    start program = "/etc/init.d/nginx start"
    stop program = "/etc/init.d/nginx stop"

To enable monitoring, create a symlink

ln -s /etc/monit/conf-available/nginx /etc/monit/conf-enabled/nginx

Check the configuration with

monit -l

To start monitoring, run

monit start all

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