You can use monit  to easily restart services as apache2, mysql, nginx and others. To install and setup is very easy, follow this lines:

# Install monit using apt
apt-get install monit

#edit monitrc to configure httpd, 
# this is the base configuration file of monit and you can
# configure other things like check interval of monit
vim /etc/monit/monitrc

# find and uncomment httpd service:
 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'

Save the file, and now you need to configure de apache and mysql file that will be use to monitoring these services, if you are user 16.04 Ubuntu version or above, you already have this templates in conf-available folder, just copy to conf-enabled folder, if you don’t have, you can see the file that you need create in conf.d folder in the end of this post.

cp/etc/monit/conf-available/apache2 /etc/monit/conf-enabled/apache2 
cp/etc/monit/conf-available/mysql /etc/monit/conf-enabled/mysql

# reload monit
monit reload

# start new services
monit start all 

# ready!

 

Older Ubuntu versions:

If you don’t have conf-available folder, you can create the files of services that you want to monitoring, inside conf.d folder.

Apache 2:

sudo vim /etc/monit/conf.d/apache2

#write and save:
 check process apache with pidfile /var/run/apache2/apache2.pid
   group www
   group apache
   start program = "/etc/init.d/apache2 start"
   stop program  = "/etc/init.d/apache2 stop"
   if 4 restarts within 20 cycles then timeout
   if failed host localhost port 80 with protocol http and request "/server-status" with timeout 25 seconds for 4 times within 5 cycles then restart
   depend apache_bin
   depend apache_rc

 check file apache_bin with path /usr/sbin/apache2
   group apache
   include /etc/monit/templates/rootbin

 check file apache_rc with path /etc/init.d/apache2
   group apache
   include /etc/monit/templates/rootbin

MySQL:

sudo vim /etc/monit/conf.d/mysql

#write and save:
 check process mysqld with pidfile /var/run/mysqld/mysqld.pid
   group database
   group mysql
   start program = "/etc/init.d/mysql start"
   stop  program = "/etc/init.d/mysql stop"
   if failed host localhost port 3306 protocol mysql with timeout 15 seconds for 3 times within 4 cycles then restart
   if failed unixsocket /var/run/mysqld/mysqld.sock protocol mysql for 3 times within 4 cycles then restart
   if 5 restarts with 5 cycles then timeout
   depend mysql_bin
   depend mysql_rc

 check file mysql_bin with path /usr/sbin/mysqld
   group mysql
   include /etc/monit/templates/rootbin

 check file mysql_rc with path /etc/init.d/mysql
   group mysql
   include /etc/monit/templates/rootbin