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System Design Masterclass · Kubernetes Containers
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You've built a container image on your laptop. Now what? Your production server in AWS needs to pull that image. Your pipeline needs to push new images after every build. Your teammate in Berlin needs to pull the same image for local development. Your staging environment needs last Tuesday's image because someone broke production with Wednesday's.
A container registry is a centralized repository for storing, versioning, and distributing container images. Think of it as GitHub for container images. You push images to it, tag them with versions, and pull them from anywhere that has network access and the right credentials.
Without a registry, you'd be copying tar files between machines over SSH. With a registry, you docker push myapp:v1.2.3 from CI, and any server anywhere can docker pull myapp:v1.2.3. The registry handles storage, versioning, access control, vulnerability scanning, and geographic distribution.
Every container platform depends on a registry. pulls images from a registry when creating pods. ECS pulls from ECR. Cloud Run pulls from Google Artifact Registry. The registry is the bridge between "code was built" and "code is running."
Not all registries are equal. Your choice depends on where you deploy, how much control you need, and what security features matter.