Setting up private registry in Docker - Try It Yourself

Setting up a Private Docker Registry

📖 Scenario: You are working in a small company that wants to store Docker images privately to share them securely among team members. You will set up a private Docker registry on your local machine to host images without using public registries.

🎯 Goal: Build a private Docker registry container, tag an image to push to it, push the image, and verify it is stored in your private registry.

📋 What You'll Learn

Create a Docker container running the official registry image

Tag the hello-world image to point to your private registry

Push the tagged image to your private registry

List images in your private registry to confirm the push

💡 Why This Matters

🌍 Real World

Companies often use private Docker registries to store and share container images securely within their network without exposing them publicly.

💼 Career

Knowing how to set up and manage private registries is essential for DevOps engineers to maintain secure and efficient container workflows.

1

Start a private Docker registry container

Run a Docker container named my-registry using the official registry:2 image. Map the container port 5000 to the host port 5000 so you can access the registry locally.

Docker

# Run the Docker registry container
# Your code here

Need a hint?

Use docker run -d -p 5000:5000 --name my-registry registry:2 to start the registry container in detached mode.

2

Tag the hello-world image for your private registry

Tag the existing hello-world image with the new name localhost:5000/hello-world so it points to your private registry on your local machine.

Docker

docker run -d -p 5000:5000 --name my-registry registry:2
# Tag the hello-world image for your private registry
# Your code here

Need a hint?

Use docker tag hello-world localhost:5000/hello-world to create the new tag.

3

Push the tagged image to your private registry

Push the image tagged as localhost:5000/hello-world to your private registry running on port 5000.

Docker

docker tag hello-world localhost:5000/hello-world
# Push the tagged image to your private registry
# Your code here

Need a hint?

Use docker push localhost:5000/hello-world to upload the image to your registry.

4

Verify the image is stored in your private registry

Run a command to list the repositories in your private registry by querying the registry API at http://localhost:5000/v2/_catalog. Use curl to get the list and print it.

Docker

docker push localhost:5000/hello-world
# Use curl to list repositories in the private registry
# Your code here

Need a hint?

Use curl http://localhost:5000/v2/_catalog to see the list of images stored in your registry.