[Interview Question] How to Create Self Hosted or Private Container Registry

[Interview Question] How to Create Self Hosted or Private Container Registry #docker #devops

Timestamps:

Theory/Concepts : 00:00
Hands on/Practical : 09:00

github repo : https://github.com/RohanRusta21/priva...

Concepts :

A container registry is a storage catalog from where you can push and pull container images.

There are many public and private registries available to developers such as Docker Hub, Amazon ECR, and Google Cloud Artifact Registry. But sometimes, instead of relying on an external vendor, you might want to host your images yourself. This gives you more control over how the registry is configured and where the container images are hosted.

What is a Container Image?

Before we talk about container registries, let's first understand what a container image is. In a nutshell, a container image is a package that includes all of the files, libraries, and configurations to run a container. They are composed of layers where each layer represents a set of file system changes that add, remove, or modify files.

The most common way to create a container image is to use a Dockerfile.

What is a Container Registry?

A container registry is a storage catalog where you can push and pull container images from. The images are grouped into repositories, which are collections of related images with the same name. For example, on Docker Hub registry, nginx is the name of the repository that contains different versions of the NGINX images.

Some registries are public, meaning that the images hosted on them are accessible to anyone on the Internet. Public registries such as Docker Hub are a good option to host open-source projects.

On the other hand, private registries provide a way to incorporate security and privacy into enterprise container image storage, either hosted in cloud or on-premises. These private registries often come with advanced security features and technical support.

There is a growing list of private registries available such as Amazon ECR, GCP Artifact Registry, GitHub Container Registry, and Docker Hub also offers a private repository feature.

Why You Might Want to Self-host a Container Registry

Sometimes, instead of relying on a provider like AWS or GCP, you might want to host your images yourself. This keeps your infrastructure internal and makes you less reliant on external vendors. In some heavily regulated industries, this is even a requirement.

A self-hosted registry runs on your own servers, giving you more control over how the registry is configured and where the container images are hosted. At the same time it comes with a cost of maintaining and securing the registry.
How to Self-host a Container Registry

There are several open-source container registry solutions available. The most popular one is officially supported by Docker, called registry, with its implementation for storing and distributing of container images and artifacts.



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