Mirror registry for docker images

Kubernetes
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#1

When using mirror registry do we have to prepend the the docker image name with registry name or just with docker image name can I pull the images.
Eg
Consider this image alpine:latest
By default this will pull from docker hub
But when configured mirror registry
Is there any way to pull by just docker pull alpine:latest can this image be pulled from private repos ?

#2

You should be able to do it like this:

Essentially, you need to add "registry-mirrors": [] to the /etc/docker/daemon.json configuration file. So if you have a mirror hosted at https://my-docker-repo.my.company.com, your /etc/docker/daemon.json should contain:

{
  "registry-mirrors": ["https://my-docker-repo-mirror.my.company.com"]
}

And then restart docker daemon.

This is telling docker clients that your private repo is a mirror of docker.io so all requests will be sent there, and the images that you would normally get from docker’s registry must all be copied to your private registry.

#3

I have followed this article

and started docker registry
with this command

$ docker run -d -p 5000:5000 --restart always --name registry registry:2

But is there any specific config required in registry container to tell this is a mirror registry.
This is my current config.

/ # cat /etc/docker/registry/config.yml
version: 0.1
log:
  fields:
    service: registry
storage:
  cache:
    blobdescriptor: inmemory
  filesystem:
    rootdirectory: /var/lib/registry
http:
  addr: :5000
  headers:
    X-Content-Type-Options: [nosniff]
health:
  storagedriver:
    enabled: true
    interval: 10s
    threshold: 3
proxies:
  default:
    remoteurl: https://registry-1.docker.io
#4 
{
  "registry-mirrors" : [
    "https://mirror.gcr.io"
  ]
}

Using this is also not working docker pull is only pulling from docker.io only
How to pull images from mirror repo

#5

If I am reading this correctly, you are running the docker registry image as a mirror (proxy) to the real docker.io, right?

In the machines where you want the docker client to read from your registry container, you need to point them to that. Why are you pointing it to mirror.gcr.io? That’s Google’s mirror, not yours.

And since you are not serving https from that container, you will also have to put it’s address in insecure-registries

{
  "registry-mirrors" : [
    "http://address-of-your-registry-container:5000"
  ],
  "insecure-registries" : [
    "http://address-of-your-registry-container:5000"
  ],
}
#6

Thanks
but it didn’t worked.
What I meant by using google mirror.gcr.io is when using google mirror registry then also docker is pulling from docker.io only.