I am trying to build kolla-ansible in China but somehow my docker repository not accessible. I understand geo location and the great firewall. Does anyone know if there is any local china repo or docker hub which I can use in that region to build the openstack. 

# docker run -d  --network host  --name registry  --restart=always  -e REGISTRY_HTTP_ADDR=0.0.0.0:4000  -v registry:/var/lib/registry  registry:2
Unable to find image 'registry:2' locally
docker: Error response from daemon: Get "https://registry-1.docker.io/v2/": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers).
See 'docker run --help'.