AWS Elastic Container Registry (ECR)
Fully managed container image registry from AWS that stores, manages, and deploys container images with deep IAM integration, lifecycle policies, and vulnerability scanning, accessed via AWS SDK and CLI.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
IAM policies for ECR push/pull permissions. Image scanning for vulnerability detection. Immutable image tags to prevent overwrite. Cross-account access via resource policies. Container image signing with AWS Signer. SOC2, FedRAMP.
⚡ Reliability
Best When
Your workloads run on AWS (ECS, EKS, Lambda containers) and you want a tightly integrated, IAM-governed container registry with no rate limits.
Avoid When
You're not on AWS, need multi-cloud portability, or want to host public images with easy external access.
Use Cases
- • Storing and retrieving container images as part of AWS-based CI/CD pipelines
- • Automating image lifecycle policies to delete old tags and control storage costs
- • Pulling vulnerability scan results for images using ECR Enhanced Scanning
- • Granting cross-account image access for multi-account AWS organizations
- • Triggering deployment workflows on image push via EventBridge integration
Not For
- • Multi-cloud container registry (ECR is AWS-specific, not portable)
- • Organizations not on AWS — cost and integration overhead not justified
- • Public image hosting at scale (Docker Hub or GHCR are better for public images)
- • Air-gapped environments without AWS connectivity
Interface
Authentication
Uses AWS IAM for all authentication and authorization. Docker login tokens are obtained via GetAuthorizationToken and expire after 12 hours. IAM policies control per-resource permissions with fine granularity.
Pricing
Costs are typically low for most organizations. Large image catalogs or high-frequency CI/CD with large images can add up.
Agent Metadata
Known Gotchas
- ⚠ Docker auth tokens from GetAuthorizationToken expire after 12 hours — agents must refresh before token expiry
- ⚠ ECR registry URLs are account-and-region-specific (123456789.dkr.ecr.us-east-1.amazonaws.com) — not portable
- ⚠ Cross-account access requires both a resource-based policy on the repository AND IAM permission for the calling account
- ⚠ Repository creation is not idempotent by default — check existence before creating or handle the exception
- ⚠ Image manifest operations (put/get) use Docker Registry HTTP API V2, not the ECR AWS API — requires separate auth
Alternatives
Full Evaluation Report
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Scores are editorial opinions as of 2026-03-07.