Upgrade 1.8.x to 1.9.0

Stop Services

service icinga stop
service ido2db stop

Upgrade Icinga

su -l icinga
tar zxvf icinga-1.9.0.tar.gz -C /tmp
cd /tmp/icinga-1.9.0
./configure --with-command-group=icinga-cmd --enable-idoutils --enable-ssl
make all
make install install-base install-cgis install-html install-init install-commandmode install-idoutils (as a root)

Upgrade IDO2DB

cd /tmp/icinga-1.9.0/module/idoutils/db/mysql/upgrade 
mysql -uroot -p icinga < mysql-upgrade-1.9.0.sql

Start Services

service ido2db start
service icinga start