Continuing from Day 4, today we explore Amazon Elastic Container Registry (ECR), AWS's managed Docker registry. We'll create a repo and manage it.
Why ECR?
ECR stores Docker images securely, integrates with ECS, and handles authentication automatically.
Step 1: Create an ECR Repository
Via Console:
- Search for ECR in AWS Console.
- Click "Create repository."
- Choose private/public, name it (e.g., my-app-repo).
- Create.
Via CLI:
aws ecr create-repository --repository-name my-app-repo --region us-west-2
Step 2: Managing Repositories
- Public vs. Private: Private for internal use; public for sharing.
- Lifecycle Policies: To clean old images, add policy via console (e.g., expire untagged images after 30 days).
{
"rules": [
{
"rulePriority": 1,
"description": "Expire untagged images",
"selection": {
"tagStatus": "untagged",
"countType": "sinceImagePushed",
"countUnit": "days",
"countNumber": 30
},
"action": { "type": "expire" }
}
]
}
Verify: aws ecr describe-repositories
Today’s Takeaway
ECR is set up! Tomorrow, push images to it.
What’s Next?
In Day 6, we’ll integrate Docker with ECR.
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