When created, container images are saved in a location where they can be accessed for more innovation and updates. Furthermore, you can share these images with multiple users across different hosts because developers and testers require access to images during various development and testing phases. Thus, you can use this shared storage location with a software solution that provides security features and image version control via tags. In addition, image repositories are collections of images that are part of the same project or are grouped according to context. At the same time, a prefix to the image name identifies the repository. Image registries, on the other hand, hold image repositories. So, here’s a guide on how to set up a private docker registry.

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Steps to Set up a Private Docker Registry

Here’s a step-by-step guide to setting up a private docker registry.

Step 1: Pull the docker registry image from docker hub

sudo docker pull distribution/registry

How to Set up a Private Docker Registry-registry — docker pull

Step 2: Run Docker’s registry container image

Then, let’s create a private registry using Docker’s registry container image with the command:

 docker run -d -p 5000:5000 --restart=always --name registry registry:2

How to Set up a Private Docker Registry-dockerrun — docker run

We mapped the registry’s port 5000 to the host port5000 while it was running in a “registry” container so that we could access it via localhost.

Step 3: Populate the registry

There are currently no images in the private registry. So, let’s populate it by retrieving an image from the public registry Docker Hub, tagging it, and pushing it into the private registry while also listing local cache registries to validate

docker image pull alpine:3.14

How to Set up a Private Docker Registry-docker-alpine — alpine

Afterwards, verify what we have with the command:

docker images

How to Set up a Private Docker Registry-alpine — docker images

Step 4: Set up Private Docker Registry by tagging the image

Then, tag the newly pulled image:

docker image tag alpine:3.14 localhost:5000/myalps

How to Set up a Private Docker Registry-tag — alpine tagged

In addition, verify this with docker images

How to Set up a Private Docker Registry-docki — docker images

Step 5: Push the tagged image

Subsequently, push the newly tagged image to the private registry:

docker image push localhost:5000/myalps

Step 6: Set up Private Docker by removing cached image

Then, we will remove cached images alpine 3:14 and localhost:5000/myalps

 docker image rm alpine:3.14

 docker image rm localhost:5000/myalps

Afterward, verify with docker images

sudo docker images

Step 7: Pull the images

Let’s pull the images from the private registry

sudo docker image pull localhost:5000/myalps

Verify this with docker images

Step 8: remove docker images

Let’s remove images that are no longer needed after successfully validating that the private registry can store container images and be used to push and pull images to and from it.

docker image rm -f registry:2

We can also do the same with the tagged image using the command:

docker image rm localhost:5000/myalps

Summary

In conclusion, images need to be stored after they have been created, and a perfect place to store container images will be a private docker registry. The steps to create one are shown above. You can set up a private docker registry with the steps mentioned above.