The deployment froze. No fixes on the server. No patch in place. The entire system was built to be replaced, not repaired.
This is the core of immutable infrastructure. Every change comes from building and shipping a new image. Nothing mutates in production. No SSH sessions to hotfix. No drift from code to runtime. The environment is identical in staging, testing, and live deploys — because each is an exact copy of a proven artifact.
A proof of concept for immutable infrastructure is the first step to validate this approach in your own stack. It answers critical questions fast: How will images be built? How will the pipeline create and deliver them? How will orchestration handle rollouts and rollbacks? By running a POC, you expose integration gaps and performance constraints before committing to full adoption.
Start by defining the build process. Use a CI/CD pipeline to produce machine images or container images with all dependencies baked in. Tag every build with a unique version. Store images in a registry with strict immutability rules. Ensure no manual changes ever occur after creation.