Default deployment allows you to install the web interface (hawk) and to deploy an administrative IP.
With such you will be able to access the web interface and check that.
Another option is to configure ClusterMon as a highly available resource and then to access the status page (via the admin IP) and then check which nodes are online, which in standby/maintenance or stopped.

Last option is to access (via the Admin IP) the Pacemaker API and get that information from there.

Actually all those solutions work from any system that has been allowed (firewall) access.