Pushing Snake and Ladder Docker Image to Container Registry

What Is Docker Hub? ## What Docker Hub Does? ## Creating a Repository in Docker Hub ## Push the Snake and Ladder Docker Image to Repository in Docker Hub ## Push the Docker Image to Amazon ECR ## Create an ECR Repository ## Authenticate Docker with Amazon ECR from EC2 ## Push Docker Image to Amazon ECR Repository So far, we have successfully Dockerized the Snake and Ladder game and verified that it runs perfectly on our local machine. That’s a great first milestone. But running a Docker image only on one machine isn’t enough. In real-world applications, we need a place where our Docker images can be stored, shared, and reused—so they can be pulled by servers, cloud services, or container platforms like ECS and Kubernetes. In this next step, we will push our Docker image to a container registry, making it accessible beyond our local system. We’ll also understand the two most commonly used Docker repositories: Docker Hub – for public and learning use cases Amazon ECR (Elastic Container Registry) – for secure, production-ready AWS deployments Docker Hub is a cloud-based repository where you can store, share, and download Docker images. Think of Docker Hub as GitHub for Docker images. Stores Docker images online Lets you push your images Lets others pull and use them Hosts thousands of pre-built images like: Public and private repositories Easy to use for beginners Free public image hosting Widely used for learning and open-source projects First, We need to create a Repository to DockerHub. If you already have an account in Dockerhub. You can simply Sign In else do a Sign Up I am Signing In, and Next step is to create a repository Click Create Repository button, Provide a name and a short description and Click Create button. Remember, we have chosen a public repository We have successfully created a repository in Docker Hub Lets come back to ec2 console, Come back to your EC2 instance and connect to it using EC2 Instance Connect. Type docker images command to see the available images. Now Authenticate Docker with Docker Hub using the EC2 command line. Run the following command: docker login When prompted, enter your Docker Hub username and password. After a successful login, you will see a confirmation message indicating that Docker is now authenticated with Docker Hub. Now, let’s tag the Snake and Ladder Docker image so it can be pushed to Docker Hub. Docker Hub requires images to follow a specific naming format: docker-username/repository-name:tag In our case, we will tag the image as: nandinivijayr/snake-ladder-game:latest Run the following command: docker image tag snake-ladder-game:latest nandinivijayr/snake-ladder-game:latest By tagging the image in this format, Docker knows which Docker Hub repository the image belongs to, making it ready to be pushed to Docker Hub in the next step. Now lets verify if the image is tagged properly by using Docker images command Now lets push the image to Docker hub using the below command docker push nandinivijayr/snake-ladder-game Amazon ECR (Elastic Container Registry) is a fully managed container image registry service provided by AWS. It is used to store, manage, and secure Docker container images so they can be easily deployed on AWS services like ECS, EKS, and Fargate. In simple terms: 👉 ECR is AWS’s private Docker image repository. Why Do We Need ECR? When applications are containerized using Docker, the images need a secure place to live so cloud services can pull and run them. Amazon ECR provides that storage inside AWS, with built-in security and scalability. Key Features of Amazon ECR Repositories are private by default Access is controlled using IAM roles and policies No usernames or passwords required Works seamlessly with: Amazon ECS, Amazon EKS, AWS Fargate Images can be pulled directly by AWS services Highly available and reliable Version images using tags Scan images for vulnerabilities Store multiple versions safely Now, Lets see how we can push image to ECR Go to home page of aws console and Navigate to the ECR service Create a private ECR repository using AWS Console by clicking Create Repository button Provide a repository name and scroll down Go with the default values and click create button Wait for a couple of minutes, You can see the new repository entry under Private Repositories Come back to your EC2 instance and connect to it using EC2 Instance Connect. Now Lets Authenticate Docker to ECR using the below command aws ecr get-login-password --region <region> | \ docker login --username AWS --password-stdin <account-id>.dkr.ecr.<region>.amazonaws.com Before pushing a Docker image to Amazon ECR, Docker must be authenticated with AWS. The recommended and secure way is to use an IAM role attached to the EC2 instance. Go to IAM → Roles → Create role Choose AWS service → EC2 AmazonEC2ContainerRegistryFullAccess Create the role by providing a role name and clicking Create Role button Go to EC2 → Instances Actions → Security → Modify IAM role Here Select the I A M role that was created in the previous step and click Update IAM Role button Wait 1–2 minutes for changes to apply. On the EC2 instance, run: aws sts get-caller-identity { "Account": "123456789", "Arn": "arn:aws:sts::123456789:assumed-role//i-0fea76487ea9663b1" } Docker uses a temporary token generated by AWS. aws ecr get-login-password --region ap-south-1 | \ docker login --username AWS --password-stdin \ 123456789.dkr.ecr.ap-south-1.amazonaws.com Expected Output Login Succeeded Note: Replace 123456789 with your own AWS Account ID. Do not change the username or password values — the username must be AWS, and the password is automatically passed using --password-stdin. Now push the image to ecr respository that was created Now that Docker authentication is successful, the next step is to push the Docker image to the Amazon ECR repository created earlier. This makes the container image available for deployment using AWS services such as Amazon ECS, App Runner, or EKS. Let’s tag the Snake and Ladder Docker image with the ECR repository URI so it’s ready to be pushed. Use the following command to tag docker tag <IMAGE NAME> <ECR Repository URI> IMAGE NAME is snake-ladder-game which we built earlier. You can get it using docker images command Now let us push the tagged image using docker push command docker push <ECR Repository URI> Docker will upload the image layers to Amazon Elastic Container Registry (ECR). Depending on the image size, this process may take a few moments. Verify the Image in Amazon ECR After the push completes: Open the AWS Management Console Navigate to Amazon ECR → Repositories Select your repository Confirm that the image with the latest tag is listed Templates let you quickly answer FAQs or store snippets for re-use. Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink. Hide child comments as well For further actions, you may consider blocking this person and/or reporting abuse - Stores Docker images online - Lets you push your images - Lets others pull and use them - Hosts thousands of pre-built images like: nginx, mysql, node, python - nginx, mysql, node, python - nginx, mysql, node, python - Public and private repositories - Easy to use for beginners - Free public image hosting - Widely used for learning and open-source projects - Secure by Default - Repositories are private by default - Access is controlled using IAM roles and policies - No usernames or passwords required - Deep AWS Integration - Works seamlessly with: Amazon ECS, Amazon EKS, AWS Fargate - Images can be pulled directly by AWS services - Fully Managed - No servers to manage - Automatically scales - Highly available and reliable - Image Management - Version images using tags - Scan images for vulnerabilities - Store multiple versions safely - Create an IAM Role for EC2 - Attach the Role to EC2 - Verify the Role - Login to Amazon ECR