Rolling updates and rollbacks in Kubernetes
Rolling Updates: When we update our application in Kubernetes, we want to avoid downtime where users experience errors or outages. So instead of updating everything instantly, Kubernetes does “rolling updates”. It’s like changing clothes by putting on a new pair of pants one leg at a time instead of standing naked to swap your whole outfit all at once!
With rolling updates, Kubernetes slowly replaces individual instances of our application with updated ones. It takes down old ones, brings up new ones in their place, and repeats until updated. Another feature is rollbacks. We all make mistakes in changing code that leads to bugs! Rollbacks are like an “undo” button – they revert application back to the safe, stable previous version.
Rollbacks: Another feature is rollbacks. We all make mistakes changing code that leads to bugs! Rollbacks are like an “undo” button – they revert application back to the safe, stable previous version. If one of our shiny new updates starts failing, Kubernetes automatically rolls back by removing the buggy updated app instances and scaling up the last good version that worked. Crisis averted!
Overall, rolling updates help avoid disruption, while automated rollbacks save us from new bugs. They let us iterate and deploy new code faster and more safely. Pretty handy features!
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!