HOWTO: Start, Stop and restart a service on Linux

There are two commands to stop and start and restart a service on Linux sytems which are the followings: service and systemctl

The first command is service:

Syntax :

  service [TheService] [ action ] 

     [ TheService ] = is the service we want to stop or start (eg:iptables, httpd, dhcpd, ..)

     [ action ] = stop, start, restart (in our case).

Let use iptables in our example, to stop iptables service using service command we need to type the following command:

service iptables restart

 you can replace restart with the action you want.

service iptables restart/stop/start

The Second command is systemctl:

 Syntax :

  systemctl [ action ] [TheService]

    [ TheService ] = is the service we want to stop or start (eg:iptables, httpd, dhcpd, ..)

     [ action ] = stop, start, restart (in our case).

We will use the same service used on last example, I mean iptables, Let get started it:

In a case to stop the  iptables service we have to type the following:

systemctl stop  iptables

 Also you can start or restart the service using the same command:
 

systemctl restart/stop/start iptables

NB: You must run those commands with Superuser privileges, just type sudo before the command and it'll ask you for Admin password.

 sudo systemctl stop  iptables

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