Performing Rollbacks
Sometimes new versions of apps don’t work as expected. Bugs could slip through testing. Unpredicted spike in traffic volumes slow things down. Changes may unintentionally break important flows. When issues pop up, Kubernetes allows rapidly rolling back deployments to a previous stable release. No need to leave users frustrated or losing business while debugging!
There are two ways to do rollbacks:
- Manual: The administrator sees problems and directly commands Kubernetes to undo the update. They specify rolling back to right before the troublesome release. Kubernetes handles creating replica sets for the old version and phasing pods back smoothly.
- Automatic: Kubernetes can monitor custom metrics like response time thresholds. If those degrade below a specified value, rollback automatically activates! The cluster reverts the change once criteria is met.
Additional options help control rollbacks:
- Revision limit: How many versions back deployment history to retain to allow rollbacks to.
- Timeout: An automatic rollback will reverse course this many seconds after issues are first detected.
With these capabilities, bad updates don’t have to spell doom. Kubernetes keeps things running for users while giving breathing room to rework changes. So don’t fear exacerbating issues during upgrades! Either manually undo them or program Kubernetes to watch and self-correct automatically.
Rolling Updates and Rollbacks in Kubernetes: Managing Application Updates
Many websites and apps now run on clusters of computers called containers. Containers let apps run smoothly as groups work on updating and improving the software behind the apps. A system called Kubernetes helps manage and update all those containerized apps. Sometimes app updates go wrong or cause problems for users. Kubernetes has clever ways to update apps that avoid issues.
The main method is called a rolling update. This slowly switches the software behind the scenes from an old version to a new one. A few containers at a time are updated to the new software. Kubernetes checks that each small batch works fine before updating more. This means no downtime for users! Another useful capability is rollbacks. If a new software version causes glitches, Kubernetes can automatically revert to the previous stable version. There is no need for websites to crash or stay broken!