Upgrading and rolling back releases in Kubernetes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of upgrading a release in Kubernetes?

Upgrading a release means updating an application or service to a newer version to add features, fix bugs, or improve performance without stopping the whole system.

beginner

How do you perform an upgrade of a Helm release?

Use the command helm upgrade <release-name> <chart> to update the release with a new chart or configuration.

beginner

What does rolling back a release mean?

Rolling back means returning an application to a previous working version if the current upgrade causes problems.

beginner

Which Helm command is used to rollback a release?

The command helm rollback <release-name> [revision] is used to revert to a previous release version.

intermediate

Why is it important to keep track of release revisions in Kubernetes?

Keeping track of revisions helps you quickly restore a stable version if an upgrade fails, ensuring minimal downtime and service reliability.

Which command upgrades a Helm release?

A kubectl rollback <release-name>

B helm rollback <release-name>

C kubectl upgrade <release-name>

D helm upgrade <release-name> <chart>

The correct command to upgrade a Helm release is 'helm upgrade '.

What does 'helm rollback' do?

A Updates the release to a new version

B Deletes the release

C Reverts the release to a previous version

D Shows the release status

'helm rollback' reverts the release to a previous version if the current one has issues.

Why might you need to rollback a release?

A To add new features

B To fix a failed upgrade

C To delete the application

D To scale the application

Rollback is used to fix problems caused by a failed upgrade by restoring a stable version.

What is a release revision in Helm?

A A version of the release configuration

B A Helm plugin

C A type of Kubernetes pod

D A backup of the cluster

A release revision is a saved version of the release configuration that can be restored.

Which tool is commonly used to manage upgrades and rollbacks in Kubernetes?

A Helm

B Docker

C kubectl

D Minikube

Helm is the package manager for Kubernetes that handles upgrades and rollbacks of releases.

Explain the process and commands used to upgrade and rollback a release in Kubernetes using Helm.

Think about how you update an app and how you fix it if the update breaks something.

Describe why tracking release revisions is important in managing Kubernetes applications.

Consider how saving versions helps you undo mistakes.