Docker: disable pulling from remote registry

Question

When I mistype things it tries to search in the central registry. How to disable it completely?

Is there an option to clear that URL?

Answer 1

If you use the a redhat clone with the rpms from centos extras, they have a parameter to do that:

--block-registry hostname

This is a RedHat extension (see here) which I don't think was accepted upstream (considering 13450)

Answer 2

As a reference, right now (docker 1.9, Nov 2015):

• pull.go looks for pull endpoints:

  s.registryService.LookupPullEndpoints()
  

• registry/service.go looks for V2 endpoint:

  s.lookupEndpoints(repoName)
  

• registry/service_v2.go appends DefaultV2Registry:

  endpoints = append(endpoints, APIEndpoint{
      URL:          DefaultV2Registry,
  

• registry/config_unix.go includes DefaultV2Registry:

  DefaultV2Registry = "https://registry-1.docker.io"
  

So until there is an option to not look for that endpoint, docker pull will still include that central default V2 registry.