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 RAM performance


To monitor RAM performance, I am only interested in a couple of metrics, not all the memory-related ones. Take a look at this list:

  • mem.util.used

  • mem.util.free

  • mem.util.bufmem

  • mem.util.cached

  • swap.free

  • swap.used

  • swap.pagesin

  • swap.pagesout

How to do it…

This recipe will explain you how to create text-based and graphical outputs:

  1. First, display live data for the preceding metrics through this command:

    ~]# pmdumptext -H -t 1 -i -l mem.util.used mem.util.free mem.util.bufmem mem.util.cached swap.free swap.used swap.pagesin swap.pagesout -h guest.example.com
    
  2. Create a configuration file for pmchart to display live data called memory.conf with the following contents:

    #kmchart
    version 1
    
    chart style stacking
            plot color #ffff00 metric mem.util.used
            plot color #ee82ee metric mem.util.free
    chart style stacking
            plot color #ffff00 metric swap.used
            plot color #0000ff metric swap.free
    chart style plot antialiasing off
            plot color #19ff00...