Recreate update strategy in Kubernetes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the Recreate update strategy in Kubernetes?

It is a deployment method where all existing pods are stopped before new pods are started. This ensures only one version runs at a time.

intermediate

How does the Recreate strategy differ from RollingUpdate in Kubernetes?

Recreate stops all old pods before starting new ones, causing downtime. RollingUpdate replaces pods gradually, keeping the app available.

beginner

When is it best to use the Recreate update strategy?

Use it when your app cannot run multiple versions at once or when you want a simple update with guaranteed clean start.

beginner

Show the YAML snippet to set Recreate update strategy in a Deployment.

spec: strategy: type: Recreate

beginner

What is a possible downside of using the Recreate update strategy?

It causes downtime because the old pods stop before new pods start, so the app is temporarily unavailable.

What happens first in the Recreate update strategy?

A Pods are updated one by one

B New pods start alongside old pods

C Pods are scaled up before scaling down

D All old pods are terminated

In Recreate, Kubernetes stops all old pods before starting new ones.

Which update strategy avoids downtime by updating pods gradually?

A RollingUpdate

B Recreate

C BlueGreen

D Canary

RollingUpdate updates pods gradually to keep the app available.

How do you specify the Recreate strategy in a Deployment YAML?

A strategy: type: Recreate

B strategy: type: RollingUpdate

C updateStrategy: Recreate

D deploymentStrategy: recreate

The correct YAML field is 'strategy.type: Recreate'.

What is a main disadvantage of the Recreate update strategy?

A Complex configuration

B Causes downtime during update

C Does not update pods

D Requires multiple versions running

Recreate causes downtime because old pods stop before new pods start.

When should you choose Recreate over RollingUpdate?

A When you want gradual updates

B When zero downtime is critical

C When app cannot run multiple versions simultaneously

D When using StatefulSets

Recreate is good when the app cannot run multiple versions at once.

Explain how the Recreate update strategy works in Kubernetes and when it is useful.

Think about how pods are replaced and app availability.

Describe the YAML configuration needed to set the Recreate update strategy in a Deployment.

Look for the 'strategy' field in Deployment YAML.