Icinga mysql

PPAPPA

add-apt-repository ppa:formorer/icinga
apt-get update
apt-get install mysql-server libdbd-mysql mysql-client
apt-get install icinga icinga-doc icinga-idoutils

Enable ido2db Daemon

vim /etc/default/icinga
IDO2DB=yes

service ido2db start

Nagios Plugins

apt-get install nagios-plugins

Enable idomod module

Check whether this has already been done in /etc/icinga/modules/idoutils.cfg. 
If not, copy the sample config over and restart Icinga to load the module. (Tip - if icinga.cfg does not contain
cfg_dir=/etc/icinga/modules the config won't be included!).

cp /usr/share/doc/icinga-idoutils/examples/idoutils.cfg-sample /etc/icinga/modules/idoutils.cfg

Icinca Web

Additional Packages

apt-get install php5 php5-cli php-pear php5-xmlrpc php5-xsl php5-gd php5-ldap php5-mysql

Install

apt-get install icinga-web