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Container Supply Chain in Cloud Computing

Learn about Container Supply Chain in this comprehensive Cloud Computing tutorial. Security first.

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1Immutable Tags

Enable 'Immutable Tags' on your ECR repository. This prevents a developer from accidentally overwriting the 'v1.0' production image with bad code. Once an image is pushed with a specific tag, it cannot be modified.

2Step-by-Step Breakdown

What is ECR?. Amazon Elastic Container Registry is a fully managed, highly secure, private Docker container registry.

The Docker Workflow. You write code -> build a Docker image locally -> authenticate to ECR -> push the image to an ECR repository.

Image URIs. Every image in ECR gets a unique URI that ECS or EKS will use to pull and run the container.

IAM Integration. ECR integrates deeply with IAM. You control exactly which developers or CI/CD pipelines have permission to push or pull images.

Knowledge Check. Which AWS service is used to privately store your compiled Docker container images?

→ECS (Elastic Container Service)
→ECR (Elastic Container Registry)

Image Vulnerability Scanning. ECR can automatically scan your Docker images for common vulnerabilities and exposures (CVEs) the moment you push them.

Lifecycle Policies. Containers generate a lot of old images over time. Lifecycle policies automatically delete untagged or old images to save on storage costs.

Cross-Region Replication. For global applications, ECR can automatically replicate your Docker images to other AWS regions.

Public Registry. While designed for private images, AWS also offers ECR Public, allowing you to share open-source images globally.

Summary. Build locally, push securely to ECR, run anywhere.

Pascual Vila

Frontend Instructor // Code Syllabus

Common Pitfalls & Errors

The Error //

Letting old image tags accumulate with no lifecycle policy

aws ecr put-lifecycle-policy --repository-name my-app \
  --lifecycle-policy-text '{"rules":[{"rulePriority":1,"selection":{"tagStatus":"untagged","countType":"sinceImagePushed","countUnit":"days","countNumber":14},"action":{"type":"expire"}}]}'

The Solution //

Every CI build pushing a new tag without cleanup leaves ECR storage (and cost) growing indefinitely. Add a lifecycle policy that expires untagged images and caps the number of tagged images retained per repository.

The Error //

Pushing images without scanning them for known vulnerabilities

aws ecr put-image-scanning-configuration --repository-name my-app --image-scanning-configuration scanOnPush=true

The Solution //

An image built from an outdated base layer can carry known CVEs straight into production. Enable ECR's image scanning (basic or enhanced) so every push is checked against a vulnerability database before it's deployed.