How To Install Munin on CentOS 6

In this tutorial, we will show you how to install Munin on CentOS 6. For those of you who didn’t know, Munin is a free and open-source networked resource monitoring tool. It offers to monitor and alerting services for servers, switches, applications, and services. Munin uses the RRDtool  Munin uses the RRDtool to present all the information in graphs through a web interface.

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. I will show you the step-by-step installation of Munin on CentOS 6.

Prerequisites

• A server running one of the following operating systems: CentOS 6.
• It’s recommended that you use a fresh OS install to prevent any potential issues.
• SSH access to the server (or just open Terminal if you’re on a desktop).
• A non-root sudo user or access to the root user. We recommend acting as a non-root sudo user, however, as you can harm your system if you’re not careful when acting as the root.

Install Munin on CentOS 6

Step 1. First, we need to add the EPEL repository to our system.

## RHEL/CentOS 6 64-Bit ##
# wget http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
# rpm -ivh epel-release-6-8.noarch.rpm

## RHEL/CentOS 6 32-Bit ##
# wget http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
# rpm -ivh epel-release-6-8.noarch.rpm

Step 2. Install Apache which is available from the CentOS repositories.

yum install httpd

Step 3. Install Munin packages.

yum --enablerepo=epel install munin munin-node rrdtool

Step 4. Configuring Apache webserver.

By default, Munin creates an Apache configuration file /etc/httpd/conf.d/munin.conf. Edit Munin Apache configuration file and add the following content:

#nano /etc/httpd/conf.d/munin.conf

Alias /munin /var/www/html/munin
<Directory /var/www/html/munin>
    Options FollowSymLinks
    AllowOverride None
    Order allow,deny
    Allow from all
</Directory>

<directory /var/www/html/munin>
    AuthUserFile /etc/munin/munin-htpasswd
    AuthName "admin"
    AuthType Basic
    require valid-user

    ExpiresActive On
    ExpiresDefault M310
</directory>
ScriptAlias /munin-cgi/munin-cgi-graph /var/www/cgi-bin/munin-cgi-graph

Step 5. Configuring the Munin server.

Edit the Munin configuration file and add/modify the following lines:

#nano /etc/munin/munin.conf

dbdir /var/lib/munin
htmldir /var/www/html/munin
logdir /var/log/munin
rundir /var/run/munin
tmpldir /etc/munin/templates

includedir /etc/munin/conf.d

graph_strategy cron
cgiurl_graph /munin-cgi/munin-cgi-graph
html_strategy cron

[localhost]
    address 127.0.0.1
    use_node_name yes

Create a password for the Munin administrator user:

htpasswd -c /etc/munin/munin-htpasswd admin

Step 6. Start Apache and Munin services.

service munin-node start
service httpd start

If all is well, open Munin at http://your-domain.com/munin using ‘admin’ as username and the previously generated Munin password as password and you will be able to access Munin graphs and data.

Congratulations! You have successfully installed Munin. Thanks for using this tutorial for installing Munin server monitoring on centos 6 systems. For additional help or useful information, we recommend you to check the official Munin website.