A fully-qualified URL for an externally-reachable address for the registry.

But my question is why we use own docker registry server instead of docker hub or third party? After using that space, we have to take subscription to upload images that increase our cost. One of the things that makes Docker so useful is how easy it is to pull ready-to-use images from a central location, Docker’s Central Registry.It is just as easy to push your own image (or collection of tagged images as a repository) to the same public registry so that everyone can benefit from your newly Dockerized service..

The Docker Registry 2.0 implementation for storing and distributing Docker images highly scalable server side application that storesand lets you distribute Docker images Not sure if this has been fixed. This header allows the docker engine to quickly resolve authentication realms and fallback to version 1 registries, if necessary. The change points to the private registry is installed in your local network.

The below line needs to go into the file /etc/default/docker on the host which runs the docker daemon. If present, it is used when creating generated URLs. Earlier this could be achieved using DOCKER_OPTS in the /etc/default/docker config file which worked on Ubuntu 14:04 and had some issues on Ubuntu 15:04.

The specification covers the operation of version 2 of this API, known as Docker Registry HTTP API V2. The Docker Registry HTTP API is the protocol to facilitate distribution of images to the docker engine. I think you know very well docker hub is providing limited space to upload docker images. For all responses to any request under the “/v2/” url space, the Docker-Distribution-API-Version header should be set to the value “registry/2.0”, even for a 4xx response. Otherwise, these URLs are derived from client requests. Docker registry server is used to manage our docker images. It interacts with instances of the docker registry, which is a service to manage information about docker images and enable their distribution.