munin&160; Munin the monitoring tool surveys all your computers and remembers what it saw. It presents all the information in graphs through a web interface. Its emphasis is on plug and play capabilities. After completing a installation a high number of monitoring plugins will be playing with no more effort.
Using Munin you can easily monitor the performance of your computers, networks, SANs, applications, weather measurements and whatever comes to mind. It makes it easy to determine "what's different today" when a performance problem crops up. It makes it easy to see how you're doing capacity-wise on any resources.
[Site]

Install

Can be done with using zypper (the command line package manager used in openSUSE since 10.2), first search the right package name

# zypper se munin

S | Name&160;&160;&160;&160;&160;&160; | Zusammenfassung&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160; | Typ&160;
--+------------+----------------------------------------------------+------
| munin&160;&160;&160;&160;&160; | Network-wide graphing framework (grapher/gatherer) | Package

| munin-node | Network-wide graphing framework (node)&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160; | Package

&160;

You’ll have to install both especially if your web server is not in a farm and run MYSQL, Tomcat and Apache at the same time. If you have more than one server, you can install munin-node (clients) on them and make them report on munin (server)

# zypper in munin

# zypper in munin-node

Configure

Open the file

# vi /etc/munin/munin.conf

and configure at least the following 3 keys, I recommend you to create a PLESK sub domain

# The next three variables specifies where the location of the RRD
# databases, the HTML output, and the logs, severally.&160; They all
# must be writable by the user running munin-cron.
dbdir&160;&160; /var/lib/munin
htmldir /srv/www/xxxxxxxxxxx/xxxxx/xxxx/xxxxx/xxxx
logdir&160; /var/log/munin
rundir&160; /var/run/munin

Change ownership of htmldir to the user and group munin, otherwise munin cannot place new files in that directory.

chown munin:munin /srv/www/xxxxxxxxxxx/xxxxx/xxxx/xxxxx/xxxx

Start the node daemon

/etc/init.d/munin-node start

Start the server node

/etc/init.d/munin start

Finish by protecting access to that sub domain

Create .htaccess

# vi .htaccess

AuthType Basic
AuthName "Administrator area"
AuthUserFile /srv/www/vhosts/waltercedric.com/subdomains/stats/httpdocs/.htpasswd
AuthType Basic
AuthName "Administrator area"
AuthUserFile /srv/www/vhosts/waltercedric.com/subdomains/stats/httpdocs/.htpasswd
<limit GET PUT POST>
require valid-user
</limit>

Create the password file

# htpasswd2 -c .htpasswd admin

Point your browser to the subdomains, and log yourself with admin, your password

Install Munin plugins

There is a huge list of available plugins, just visit http://muninexchange.projects.linpro.no/

Example for displaying the number of PHP sessions as a graph

475-1

# cd /etc/munin/plugins

and wget the desired plugins

# wget http://muninexchange.projects.linpro.no/download.php?phid=475

restart the node

munin.running

munin.running2