Kubernetes Container Orchestration Cloud Native Patterns 3

Question 1

What does the 'Health Endpoint Monitoring' pattern require an application to expose?

Accepted Answer

An HTTP endpoint that returns the application's current health status

Answer

The Health Endpoint Monitoring pattern requires services to expose a dedicated HTTP endpoint (like /healthz) that external systems can poll to check health.

Question 2

In Kubernetes, which probe type implements the 'Readiness' aspect of the Health Endpoint Monitoring pattern?

Accepted Answer

readinessProbe

Answer

The readinessProbe tells Kubernetes when a container is ready to accept traffic, removing it from Service endpoints when it fails.

Question 3

The 'Retry' pattern with exponential backoff in a cloud native system is designed to handle:

Accepted Answer

Transient faults that may resolve on their own after a short wait

Answer

The Retry pattern with exponential backoff handles transient faults by retrying failed operations with increasing delays between attempts.

Question 4

Which cloud native pattern prevents a service from repeatedly calling a failing dependency, allowing it time to recover?

Accepted Answer

Circuit Breaker

Answer

The Circuit Breaker pattern stops forwarding requests to a failing service after a threshold is exceeded, giving it time to recover before trying again.

Question 5

In Kubernetes, how is the 'Leader Election' pattern typically implemented for controllers?

Accepted Answer

Via a Lease object in the coordination.k8s.io API group

Answer

Kubernetes controllers use the Lease API (coordination.k8s.io/v1) to perform leader election, ensuring only one replica acts as the active controller.

Kubernetes Container Orchestration Practice Test

Kubernetes Container Orchestration Practice Test

Kubernetes Container Orchestration Cloud Native Patterns 3