Introduction to services

In this section, we will show you how to work with services in CentOS 7.

Let's open your three VMs, master, client1, and client2, from the previous section of this chapter in three different tabs that are connected together on the same internal subnetwork.

Let's begin by installing a simple networking service. In our example, let's install the Apache2 web server on the master server, as it is very easy to set up and use:

Now, following installation of the httpd package on CentOS 7, you can manage services using the systemctl command, which is part of the systemd service.

To get a list of all the units currently available in the system, use the following command: system ctl list-units. This will open the unit list with less navigation:

As you can see, different kinds of unit files are available; for example, one that ends with device, one that ends with mount, and the service files. Press q to quit the navigation. To get a list of all the services currently available in...