[TBD]Understanding service start/stop management in Linux

Introduction

Laymen explanation

Technical explanation

There are two officially adopted methods for controlling services:

• • systemctl

  • service

Which one you use will depend on if your distribution makes use of systemd or init. Fortunately, the developers of systemd made sure to retain service and redirect it to systemctl.

systemctl usage

Let's say we're on CentOS and we want to stop the Apache server. To do this we'd open up a terminal window and issue the command:

sudo systemctl stop httpd

The Apache server would stop and you'd be returned to the bash prompt. To start the same service, we'd issue the command:

sudo systemctl start httpd

The service would start and you'd be returned to your bash prompt.

To restart the same service, we'd issue the command:

sudo systemctl restart httpd

The service would restart and you'd be returned to the bash prompt.

Other useful commands

start/stop/restart /try-restart /reload /status/enable/disable

Service usage

The service command usage is a bit different from systemctl. The service name and start|stop|restart options are switched:

sudo service httpd start ​sudo service httpd stop ​sudo service httpd restart

Manual control

You can directly walk thro' the control script and run the command for start/stop. For example, below command will restart networking.

sudo /etc/init.d/networking restart

Reference

http://www.techrepublic.com/article/how-to-start-stop-and-restart-services-in-linux/

https://askubuntu.com/questions/230698/how-to-restart-the-networking-service

https://linoxide.com/linux-command/start-stop-services-systemd/