Icinga

Icinga will be automatically installed and setup when installing icingaweb2-module-director, which is a dependency of nmsprime-hfcreq.

Issue: Icinga won't start after hostname change

Icinga stores the old hostname in a cache file, thus having problems to restart if the hostname was changed. The solutions is as follows:

1. rm /var/cache/icinga2/icinga2.{debug,vars}
2. icinga2 api setup
3. systemctl restart icinga2.service