Testing running services

In this section, we're going to look at three ways we can see whether a service is actually running, once we've issued a start command.

We'll start with the built-in systemd way (systemctl) before moving to a generic way (ps) and finally a simple way (telnet).

Getting ready

Connect to your centos1 VM. Install and start httpd if it's not already started.

We'll also install telnet for some basic port checking:

$ sudo yum install -y httpd telnet
$ sudo systemctl enable --now httpd

How to do it...

With systemd's built...