Docker: disable remote registry extraction

Question

When I am mistaken, he tries to search the central registry. How to completely disable it?

Is it possible to clear this URL?

Answer 1

If you are using a redhat clone with rpms from additional centos functions, they have an option for this:

--block-registry hostname 

This is a RedHat extension (see here ), which I think has not been adopted upstream (given 13450 )

Answer 2

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

• pull.go looks for pull endpoints:

   s.registryService.LookupPullEndpoints() 

• registry/service.go looking for a V2 endpoint:

   s.lookupEndpoints(repoName) 

• registry/service_v2.go appends DefaultV2Registry:

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

• registry/config_unix.go includes registry/config_unix.go :

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

So, while it’s possible not to look for this endpoint, docker pull will still enable this central V2 registry by default.