How To Install Nmon on CentOS 7

r00t June 15, 2016

In this tutorial we will show you how to install and configuration of Nmon on your CentOS 7 server.  For those of you who didn’t know, Nmon (Nigel’s performance Monitor for Linux) is another very useful command line utility that can display information about various system resources like CPU usage, memory, network, disks, file systems, NFS, top processes etc. It was developed at IBM and later released open source. It is available for most common architectures like x86, ARM and platforms like linux, unix etc. It is interactive and the output is well organised similar to htop.

This article assumes you have at least basic knowledge of linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo’ to the commands to get root privileges. I will show you through the step by step installation Nmon on a CentOS 7 server.

Install Nmon on CentOS 7

Step 1. First let’s start by ensuring your system is up-to-date.

Step 2. Installing Nmon.

By default, nmon is available in the CentOS 7 repository. You can easily install it by running the following command:

Once the installation of Nmon has been finished and you launch it from the terminal by typing the ‘nmon‘ command you will be presented with the following output:

Install Nmon on CentOS 7

As you can see from the above image, the nmon command-line utility runs completely in interactive mode and you can easily toggle statistics using shortcut keys. You can use the following nmon keyboard shortcuts to display different system stats:

  • t = Top Process Stats
  • c = CPU by Processor
  • l = Longer term CPU Averages
  • m = Memory and Swap Stats
  • j = JFS Usage Stats
  • h = Help Information
  • n = Network Stats
  • d = Disk I/O Stats
  • o = Disk Busy Map
  • k = Kernel Stats and Load average
  • v = Virtual Memory Stats
  • g = User defined disk groups
  • v = Verbose Simple Checks
  • b = Black and White Mode
  • N = NFS

Congratulation’s! You have successfully installed Nmon. Thanks for using this tutorial for installing Nmon linux monitoring tools on your CentOS 7 system. For additional help or useful information, we recommend you to check the official Nmon web site.

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