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openstackopenstack-novaceilometer

Openstack API - Nova vs Ceilometer to Know Instance State

Does anyone knows a way to ask to openstack, through API, if a instance is running or not? I don't even know if I have to ask to Ceilometer or Nova.

Thanks in advance

Solution

  • Normally you would ask Nova to get current state, and Ceilometer to get historical states (e.g. for billing). Assuming you've got a valid nova client:

     servers = nova.servers.list(detailed=True)
 for s in servers:
     print(s.status)

    There are potentially other attributes that can give you more detailed information depending on your setup, e.g. extended status power state (you need to use getattr vs . because of the illegal identifier characters in the name): 

     print(getattr(s, "os-extended-status:power_state"))