The mechanism for managing and starting processes on boot has been changed. Until RHEL/CentOS  6.x, you would have created a script in /etc/init.d/ and enabled with the help of chkconfig but things are different on RHEL 7.

It’s replaced by systemd and since it is more or less the default process manager on major Linux versions, System Admin versed in other flavors will feel right at home. In this article, we will explore what systemd is, what the reasons to the switch were, and how to use systemd to set up, run and manage background processes with it.