Pushing Docker Images to Docker Hub

In this exercise, you continue your role as a DevOps engineer at a fast-growing tech startup. After successfully building a multi-stage Docker image for your todo management application, it’s time to share that image with your team by pushing it to Docker Hub. This will enable other developers and environments to pull the image directly, streamlining your deployment process.

Requirements

You are tasked with pushing the Docker image you created in the previous exercise to Docker Hub. This involves tagging the image correctly, authenticating with Docker Hub, and then pushing the image to a public repository. Once the image is pushed, you'll verify that it can be pulled and used in a different environment.

Detailed Requirements and Acceptance Criteria:

1. Tag the Docker Image:

   • You must tag the Docker image created in the "Building Multi-Stage Docker Images" exercise. The tag should follow the convention dockerhub-username/repository-name:tag.
   • Ensure that the tag is descriptive (e.g., multi-stage-latest).

2. Login to Docker Hub:

   • Use the docker login command to authenticate with Docker Hub using your credentials.
   • The login must be successful before proceeding.

3. Push the Image to Docker Hub:

   • Push the tagged image to Docker Hub using the docker push command.
   • Verify that the push is successful and the image appears in your Docker Hub repository.

4. Pull the Image from Docker Hub:

   • On a different environment or machine, use the docker pull command to retrieve the image from Docker Hub.
   • Run the pulled image to ensure that it works as expected.

5. Acceptance Criteria:

   • The Docker image must be successfully tagged and pushed to Docker Hub.
   • The image should be publicly accessible on Docker Hub and able to be pulled and run on a different machine without any issues.

Make sure if you are using sudo with docker, all commands including docker login should use sudo. Otherwise you may face permission denied issues while pushing docker images.

Resources

• Docker Hub Documentation
• Docker CLI Reference
• Project Repository: TODO App Github Repository (Branch: MULTI-STAGE-BUILDS)

Possible Ways to Implement

• Tag the Docker Image: Tag the Docker image with your Docker Hub username and repository name.
• Login to Docker Hub: Use docker login to authenticate with Docker Hub.
• Push the Docker Image: Use docker push to upload the image to your Docker Hub repository.
• Verify the Image: Ensure that the image is available on Docker Hub and can be pulled from another environment.