Добавляем Icinga2 репозиторий в пакетный менеджер

Debian:

wget -O - http://packages.icinga.com/icinga.key | apt-key add -
echo 'deb http://packages.icinga.com/debian icinga-jessie main' >/etc/apt/sources.list.d/icinga.list
apt-get update

Ubuntu 14.04:

wget -O - http://packages.icinga.com/icinga.key | apt-key add -
echo 'deb http://packages.icinga.com/ubuntu icinga-trusty main' >/etc/apt/sources.list.d/icinga.list
apt-get update

Ubuntu 16.04:

curl -sSL https://packages.icinga.com/icinga.key | sudo apt-key add -
echo 'deb https://packages.icinga.com/ubuntu icinga-xenial main' >/etc/apt/sources.list.d/icinga.list
apt-get update

RHEL/CentOS 7:

yum install https://packages.icinga.com/epel/7/release/noarch/icinga-rpm-release-7-1.el7.centos.noarch.rpm

RHEL/CentOS 6:

yum install https://packages.icinga.com/epel/6/release/noarch/icinga-rpm-release-6-1.el6.noarch.rpm

RHEL/CentOS 5:

rpm -i http://packages.icinga.com/epel/5/release/noarch/icinga-rpm-release-5-1.el5.centos.noarch.rpm

Устанавливаем EPEL для RHEL/CentOS

CentOS 7/6/5:

yum install epel-release

Установка

Debian/Ubuntu:

apt-get install icinga2

RHEL/CentOS 5/6:

yum install icinga2
chkconfig icinga2 on
service icinga2 start

RHEL/CentOS 7 and Fedora:

yum install icinga2
systemctl enable icinga2
systemctl start icinga2

Установка nagios-plugins

Debian/Ubuntu:

apt-get install nagios-plugins-all

RHEL/CentOS 7 and Fedora:

yum install nagios-plugins-all

Запуск мастера

icinga2 node wizard