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
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
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
Afterwards, verify what we have with the command:
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
In addition, verify this with 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.