Munin is an excellent system monitoring tool similar to RRD tool which will give you ample information about system performance in multiple fronts like disk, network, process, system and users. These are some of the default properties Munin monitors.
How Munin works?
Munin works in a client-server model. Munin server process on main server try to collect data from client daemon which is running locally(Munin can monitor it’ss own resources) or from remote client(Munin can monitor hundreds of machines) and displays them in graphs on its web interface.
Configuring Munin in nutshell
This is of two steps as we have to configure both server and client.
1)Install Munin server package and configure it so that it get data from clients.
2)Configure Munin client so that server will connect to client daemon for data collocation.
Install munin server in Linux
Munin server installation on Ubuntu/Debian based machines
apt-get install munin apache2
Munin server installation on Redhat/Centos based machines. Make sure that you enable EPEL repo before installing Munin on Redhat based machines as by default Redhat based machines do not have Munin in their repos.
yum install munin httpd
Configuring Munin server in Linux
Below are the steps we have to do in order to bring server up.
1) Add host details which need monitoring in /etc/munin/munin.conf
2) Configure apache web server to include munin details.
3) Create User name and password for web interface
4) Restart apache server
Step 1: Add hosts entry in this file in /etc/munin/munin.conf. Go to end of the file and a client to monitor. Here in this example, I added my DB server and its IP address to monitor
Example:
[db.linuxnix.com]
address 192.168.1.25
use_node_name yes
Save the file and exit.
Step 2: Edit/create munin.conf file in /etc/apache2/conf.d folder to include Munin Apache related configs. In another note, by default other Munin web related configs are kept in /var/www/munin folder.
vi /etc/apache2/conf.d/munin.conf
Content:
Alias /munin /var/www/munin
Order allow,deny
Allow from localhost 127.0.0.0/8 ::1
AllowOverride None
Options ExecCGI FollowSymlinks
AddHandler cgi-script .cgi
DirectoryIndex index.cgi
AuthUserFile /etc/munin/munin.passwd
AuthType basic
AuthName “Munin stats”
require valid-user
ExpiresActive On
ExpiresDefault M310
Save the file and exit
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