I need some advise and comment... I'm not able to ssh access compute node in openstack and due to that not able to perform shutdown. Any other proper way to shutdown the server if this is the case... I'm thinking of shutdown/reboot via idrac but not sure if this is a good without broken any openstack system. Thanks for your advise.
Openstack doesn't have a way to control (e.g. shut down) the compute node.
If you are concerned about the instances running on the compute node, they can be shutdown via the horizon dashboard, the openstack client or the nova client. Do this before you shutdown the compute node via the idrac.