OpenStack Core Components 3

Question 1

In OpenStack, what is the role of the 'nova-scheduler' component?

Accepted Answer

Selecting the compute host for a new instance

Answer

nova-scheduler evaluates compute hosts against configured filters and weights to determine the best host for a new VM.

Question 2

What is the purpose of a Keystone 'endpoint' in OpenStack?

Accepted Answer

A URL registered in the service catalog for a specific service and region

Answer

Keystone endpoints are URLs stored in the service catalog that clients use to reach a specific OpenStack service in a given region.

Question 3

Which Neutron agent is responsible for applying security group rules on compute nodes?

Accepted Answer

neutron-openvswitch-agent

Answer

The neutron-openvswitch-agent (or linuxbridge-agent) runs on compute nodes and enforces security group rules via iptables or OVS flows.

Question 4

What does 'Cinder' provide in an OpenStack deployment?

Accepted Answer

Block storage volumes attachable to instances

Answer

Cinder is the OpenStack Block Storage service that provides persistent block volumes that can be attached to and detached from Nova instances.

Question 5

Which OpenStack service provides object storage with high durability through replication?

Accepted Answer

Swift

Answer

Swift is OpenStack's Object Storage service that stores unstructured data with configurable replication for high durability.

OpenStack Practice Test