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Learn Kubernetes: A Deep Dive

Rolling Updates with Deployments

Explore how Kubernetes Deployments support zero-downtime rolling updates and seamless rollbacks by managing ReplicaSets and Pods. Understand best practices for designing microservices with backward and forward-compatible APIs to ensure smooth and reliable application updates.

We'll cover the following...

Let's take a closer look at rolling updates and rollbacks.

Rolling updates

Deployments are amazing at zero-downtime rolling updates (rollouts). But they work best if we design our apps to be:

  1. Loosely coupled via APIs

  2. Backward and forward-compatible

Both are hallmarks of modern cloud-native microservices apps and work as follows.

Our microservices should always be loosely coupled and only communicate via well-defined APIs. Doing this means we can update and patch any microservice without having to worry about impacting others — all connections are via formalized APIs that expose documented interfaces and hide specifics.

Ensuring releases are backward and forward-compatible means we can perform independent updates without caring which versions of clients are consuming the ...