Rollback

Q: How deeply does Acing the Certified Kubernetes Administrator Exam, Second Edition cover rollback?

Explains revision history, annotations, undo behavior, and status verification, but does not detail rollback internals.

As explained in Acing the Certified Kubernetes Administrator Exam, Second Edition

Rollback is the restoration of an application to a previous known configuration or version after a change.

Rollback restores a Kubernetes Deployment to a previous recorded revision after a change introduces a bug or otherwise requires rapid reversal. Kubernetes creates a new revision whenever pods change; undoing a revision creates another revision rather than decreasing the revision number. section 5.1.3

Use this operational sequence to reverse a problematic Deployment change:

Inspect revisions with kubectl rollout history deploy <name>. section 5.1.3
Record the reason for a change with the kubernetes.io/change-cause annotation. section 5.1.3
Revert the Deployment with kubectl rollout undo deploy <name>. section 5.1.3
Verify completion with kubectl rollout status deploy <name>, then annotate the new revision when useful. section 5.1.3

Reverting a faulty image update

After changing the Apache image and discovering a bug, run kubectl rollout undo deploy apache. The Deployment returns to the previous application version, while its history records the rollback as a new revision. Add the note reverted back to the original and confirm success with kubectl rollout status deploy apache.

How Acing the Certified Kubernetes Administrator Exam, Second Edition covers it

Cover of Acing the Certified Kubernetes Administrator Exam, Second Edition

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Also explained in

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Machine Learning Platform EngineeringA rollback is the restoration of a deployed application to a previously functioning version.
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.NET in Action, Second EditionA rollback discards the changes made within a database transaction.
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Architecting an Apache Iceberg LakehouseAn operation that makes an earlier table snapshot the current state without necessarily deleting files introduced by later snapshots.
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Think Like a Software Engineering ManagerA rollback is the restoration of a software system or deployment to a previous known state after a change causes problems.
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Kubernetes in Action, Second EditionA rollback is the reversion of a deployed application workload to an earlier version or revision.
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GitHub Actions in Action: Continuous integration and delivery for DevOpsRollback is the process of returning a deployment or system to a previously known good version or state.
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Infrastructure as Code, Patterns and Practices: With examples in Python and TerraformRollback is the restoration of infrastructure configuration or system state to an earlier known-good version.

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Related concepts

roll-forwardcontrasts with · Roll-forward is a recovery technique that corrects a faulty or failed change by applying a subsequent corrective change rather than reverting to a previous state.
database transactionpart of · A database transaction is a logical unit of database operations whose changes are committed together or rolled back as a whole.
feature flaguses · A feature flag is a configuration control that conditionally enables, disables, or selects a software feature or behavior.
load balanceruses · A load balancer is a hardware or software component that distributes incoming network traffic or requests among multiple destinations, such as servers or service instances.
kubectl rollout undoimplemented by · kubectl rollout undo is a Kubernetes command that reverts a workload to a previous recorded revision.

This explainer was generated by Manning's knowledge graph from the text of Acing the Certified Kubernetes Administrator Exam, Second Edition. The section links point to the parts of the book it draws on.