OpenStack Vskills 3

Question 1

What does the 'nova evacuate' command do?

Accepted Answer

Moves instances off a failed compute host to another host

Answer

nova evacuate rebuilds instances from a failed compute host onto another available host, recovering them after a node failure.

Question 2

Which Ceph storage pool type is recommended for OpenStack Cinder volumes in production?

Accepted Answer

Replicated pool with size=3

Answer

A replicated pool with size=3 (three copies) provides balanced performance and fault tolerance for block storage workloads.

Question 3

In OpenStack Neutron, what is the function of a 'security group'?

Accepted Answer

Defining firewall rules controlling ingress and egress traffic to instances

Answer

Security groups act as virtual firewalls, defining allowed inbound and outbound traffic rules applied to instance network ports.

Question 4

Which token format does modern Keystone (v3) use by default?

Accepted Answer

Fernet tokens

Answer

Fernet tokens are the default in modern Keystone as they are lightweight, encrypted, and do not require database persistence.

Question 5

What is the purpose of Heat's 'stack update' operation?

Accepted Answer

Applying changes to an existing stack based on an updated template

Answer

stack update applies changes defined in a revised HOT template to an already-deployed stack, modifying only the affected resources.

OpenStack Practice Test