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System Design Masterclass · Kubernetes Containers
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You deploy myapp:latest to production on Monday. Works great. On Wednesday, a junior developer pushes a broken build, and CI automatically tags it latest. Friday at 3 AM, a production server restarts and pulls myapp:latest, the broken Wednesday build. Your on-call engineer spends two hours figuring out why production is now running different code than what was deployed Monday.
This is a versioning problem. Without explicit version tags, you have no way to know what code a container is running, no way to roll back to a known-good version, and no guarantee that two servers pulling the same tag get the same image.
Proper image versioning gives you three things:
myapp:v1.2.3 to myapp:v1.2.2 takes seconds. The old image is already in the registry, ready to deploy.Stripe, Shopify, and Uber all enforce strict image versioning. Stripe's CI rejects any manifest that references latest. Shopify pins every production deployment to a git SHA. Uber's system requires both a semver tag and a commit hash on every image.