Container Registries

Store, manage, and distribute container images across cloud and self-hosted registries.

When to Use This Skill

Use this skill when:

• Pushing and pulling container images
• Configuring registry authentication
• Setting up image retention policies
• Managing private container registries
• Implementing image scanning and security

Prerequisites

• Docker or Podman installed
• Cloud CLI tools (AWS CLI, az, gcloud) for respective registries
• Appropriate IAM permissions

Docker Hub

Authentication

# Login
docker login

# Login with token
echo "$DOCKER_TOKEN" | docker login -u username --password-stdin

Push/Pull Images

# Tag image
docker tag myapp:latest username/myapp:latest

# Push
docker push username/myapp:latest

# Pull
docker pull username/myapp:latest

Automated Builds

Configure in Docker Hub UI:

1. Connect GitHub/Bitbucket repository
2. Set build rules (branch → tag mapping)
3. Configure build context and Dockerfile path

Amazon ECR

Setup

# Create repository
aws ecr create-repository \
  --repository-name myapp \
  --image-scanning-configuration scanOnPush=true \
  --encryption-configuration encryptionType=AES256

# Get registry URI
REGISTRY=$(aws ecr describe-repositories \
  --repository-names myapp \
  --query 'repositories[0].repositoryUri' \
  --output text | cut -d'/' -f1)

Authentication

# Login (Docker)
aws ecr get-login-password --region us-east-1 | \
  docker login --username AWS --password-stdin $REGISTRY

# Login with credential helper
# Add to ~/.docker/config.json:
{
  "credHelpers": {
    "123456789.dkr.ecr.us-east-1.amazonaws.com": "ecr-login"
  }
}

Push/Pull

# Tag and push
docker tag myapp:latest $REGISTRY/myapp:latest
docker push $REGISTRY/myapp:latest

# Pull
docker pull $REGISTRY/myapp:latest

Lifecycle Policy