Packstack includes Nagios and some monitoring sensors. OpenStack itself does not propose a monitoring solution, although ceilometer has a concept of alarms, you would need a lot more to monitor OpenStack.

The OpenStack operations guide ( http://docs.openstack.org/openstack-o... ) has a chapter on monitoring.

There is a Monitoring Working group starting following the last summit ( https://wiki.openstack.org/wiki/Opera... ) and a github repository where people are sharing their various problems etc. at https://github.com/osops/tools-monito...

Some of the monitoring projects also include OpenStack monitoring packs such as Zenoss.

as far as i know the nagios is not shipped by OpenStack so far, OpenStack is just a framework to orchestrate various technologies to make them work together, nagios is for monitoring and you might need nagios driver for OpenStack to do monitoring.

BTW: if you want to do monitoring in OpenStack, the ceilometer is a greate project to look at, it will become the major solution for monitoring which uses various existing monitoring methods like nagios zabbar ... as plugins in a near future.

Hope that helps!

Vic