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Back 🐳 Amazon ECR (Elastic Container Registry) 23 Aug, 2025
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🌟 What is ECR?

Amazon Elastic Container Registry (ECR) is a fully managed container image registry by AWS.
It allows you to store, manage, and share Docker container images securely, just like Docker Hub, but inside AWS.

🔑 Key Features

  • 🔒 Secure Storage → Integrated with AWS IAM for access control

  • ⚡ High Availability → Fully managed, scalable storage for images

  • 🛠️ Integration → Works with ECS, EKS, and Fargate seamlessly

  • 🔄 Lifecycle Policies → Automatically clean up unused images

  • 📦 Supports OCI (Open Container Initiative) image format

  • 🌍 Global Access → Push & pull images from anywhere via AWS CLI or SDK

⚙️ How ECR Works

  1. 👨‍💻 Developer builds a Docker image locally

  2. 🔑 Authenticate to ECR using AWS CLI

  3. 📤 Push image to ECR repository

  4. 📥 ECS / Fargate / EKS pulls image during deployment

  5. 🚀 Run containerized app in AWS

🧩 ECR Workflow

  1. Create Repository → A place to store images

  2. Build Image → docker build -t myapp .

  3. Authenticate to ECR → aws ecr get-login-password

  4. Tag Image → docker tag myapp:latest <aws_account_id>.dkr.ecr.<region>.amazonaws.com/myapp:latest

  5. Push Image → docker push <aws_account_id>.dkr.ecr.<region>.amazonaws.com/myapp:latest

  6. Deploy → ECS / Fargate / EKS pulls the image

🏆 ECR vs Docker Hub

Feature Docker Hub 🐳 Amazon ECR ☁️
Hosting Public/Private Private (with AWS security)
Integration Works with all platforms Best with AWS ECS/EKS/Fargate
Authentication Docker login AWS IAM authentication
Cost Free/Paid tiers Pay for storage & data transfer
Security Basic Strong AWS IAM + Encryption

🌈 Analogy

Think of ECR as a private warehouse for your containers 📦:

  • Docker Image = Product 🛍️

  • ECR = Warehouse 🏢

  • Push = Sending product to warehouse 🚚

  • Pull = Taking product from warehouse for delivery 📦

  • ECS/Fargate/EKS = Delivery services 🚀