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Building a Private Docker Registry

Docker registries provide a powerful way to manage and distribute your Docker images. Docker offers a free registry at Docker Hub, but in many scenarios, you may want greater control of your images, not to mention that it is not free to have more than one private repository on Docker Hub. Fortunately, you can build and manage your own private registries, allowing you full control over where your images are housed and how they can be accessed. In this lab, you will have the opportunity to work with a private registry. You will build your own private registry, and you will have a chance to practice some advanced setup to ensure that your private registry is secure. After completing this lab, you will know how to set up a simple but secure private Docker registry.

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Lab platform
Lab Info
Level
Intermediate
Last updated
Sep 25, 2025
Duration
1h 0m

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Table of Contents
  1. Challenge

    Set up the private registry.
    1. Create an htpasswd file containing the login credentials for the initial account.
    2. Create a self-signed certificate for the registry. For the common name, enter the hostname of the registry server, which is ip-10-0-1-101.
    3. Create a container to run the registry.
    4. Once the registry starts up, verify that it is responsive. It's OK if this command returns nothing, just make sure it does not fail.
  2. Challenge

    Test the registry from the Docker workstation server.

    Note: A private Docker registry is running on the Docker registry server using version 2.7 of the registry image.

    1. Get the public hostname from the registry server. It should be ip-10-0-1-101.
    2. Add the registry's public self-signed certificate to /etc/docker/certs.d. The scp command is copying the file from the registry server to the workstation. The password is the normal cloud_user password provided by the lab.
    3. Log in to the private registry from the workstation. The credentials should be username docker and password d0ck3rrU73z.
    4. Test the registry by pushing an image to it. You can pull any image from the Docker hub and tag it appropriately to push it to the registry as a test image.
    5. Verify image pulling by deleting the image locally and re-pulling it from the private repository.
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