COA COA High Availability & Fault Tolerance

Question 1

Which OpenStack service provides load balancing as a service for high availability deployments?

Accepted Answer

Octavia

Answer

Octavia is OpenStack's load balancing service that provides scalable, highly available load balancers for applications.

Question 2

What is the default availability zone name created by Nova during OpenStack installation?

Accepted Answer

nova

Answer

Nova creates a default availability zone named 'nova' that contains all compute nodes not explicitly assigned to another zone.

Question 3

Which database clustering solution is most commonly used for OpenStack controller high availability?

Accepted Answer

MariaDB Galera Cluster

Answer

MariaDB Galera Cluster provides synchronous multi-master replication for OpenStack's database layer in HA controller deployments.

Question 4

What Nova operation moves all instances from a failed compute host to other available hosts?

Accepted Answer

nova evacuate

Answer

Nova evacuate transfers instances from a failed compute host to healthy hosts, restoring service after hardware failure.

Question 5

Which messaging backend with mirrored queues is most commonly deployed for OpenStack RPC high availability?

Accepted Answer

RabbitMQ with mirrored queues

Answer

RabbitMQ with mirrored queues is the standard OpenStack messaging backend, providing HA for inter-service RPC communication.

(COA) Certified OpenStack Administrator Exam Practice Test