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

Monitoring services using journalctl


Systemd's journal has the added advantage that its controls allow you to easily narrow down on messages generated by specific services.

How to do it…

Here are the steps you need to perform for this recipe:

  1. First, display all the messages generated by your system.

    This will show all the messages generated on the system; run the following commands:

    ~]# journalctl
    -- Logs begin at Fri 2015-06-26 23:37:30 CEST, end at Sat 2015-07-25 00:30:01 CEST. --
    Jun 26 23:37:30 rhel7.mydomain.lan systemd-journal[106]: Runtime journal is using 8.0M (max 396.0M, leaving 594.0M of free 3.8G, current limit 396.0M).
    Jun 26 23:37:30 rhel7.mydomain.lan systemd-journal[106]: Runtime journal is using 8.0M (max 396.0M, leaving 594.0M of free 3.8G, current limit 396.0M).
    Jun 26 23:37:30 rhel7.mydomain.lan kernel: Initializing cgroup subsys cpuset
    ...
    ~]#
    
  2. Now, display all system-related messages.

    This command shows all the messages related to the system and not its users:

    ~]# journalctl...