Book Image

Red Hat Enterprise Linux Server Cookbook

By : Jakub Gaj, Leemans
5 (1)
Book Image

Red Hat Enterprise Linux Server Cookbook

5 (1)
By: Jakub Gaj, Leemans

Overview of this book

Dominating the server market, the Red Hat Enterprise Linux operating system gives you the support you need to modernize your infrastructure and boost your organization’s efficiency. Combining both stability and flexibility, RHEL helps you meet the challenges of today and adapt to the demands of tomorrow. This practical Cookbook guide will help you get to grips with RHEL 7 Server and automating its installation. Designed to provide targeted assistance through hands-on recipe guidance, it will introduce you to everything you need to know about KVM guests and deploying multiple standardized RHEL systems effortlessly. Get practical reference advice that will make complex networks setups look like child’s play, and dive into in-depth coverage of configuring a RHEL system. Also including full recipe coverage of how to set up, configuring, and troubleshoot SELinux, you’ll also discover how secure your operating system, as well as how to monitor it.
Table of Contents (12 chapters)
11
Index

The systemd service and setting runlevels


The systemd service doesn't use runlevels as SysV or Upstart do. The alternatives for systemd are called targets. Their purpose is to group a set of systemd units (not only services, but also sockets, devices, and so on) through a chain of dependencies.

How to do it…

Managing targets with systemd is pretty simple, as shown through the following steps:

  1. List all target units, as follows:

    ~]# systemctl list-unit-files --type target
    UNIT FILE                 STATE   
    anaconda.target           static  
    basic.target              static  
    bluetooth.target          static  
    cryptsetup.target         static  
    ctrl-alt-del.target       disabled
    default.target            enabled
    ...
    
    sysinit.target            static  
    system-update.target      static  
    time-sync.target          static  
    timers.target             static  
    umount.target             static  
    
    58 unit files listed.
    ~]#
    

    This list shows all target units available followed by information regarding whether...