dind k8s local docker registry

gistfile1.txt

https://github.com/kubernetes-sigs/kubeadm-dind-cluster/issues/56

Run registry in docker on your host:
$ docker run -d -p 5000:5000 --restart=always --name registry registry:2
Now localhost:5000 is a registry url.

$ docker tag alpine:3.6 localhost:5000/alpine:3.6                                        
$ docker push localhost:5000/alpine:3.6     
...
3.6: digest: sha256:d6eda1410b93902ac84bdd775167c84ab59e5abadad88791d742fea93b161e93 size: 528
Run a proxy to forward each node's localhost:5000 to host's :5000 with a simple script:
  docker ps -a -q --filter=label=mirantis.kubeadm_dind_cluster | while read container_id; do
    docker exec ${container_id} /bin/bash -c "docker rm -fv registry-proxy || true"
    # run registry proxy: forward from localhost:5000 on each node to host:5000
    docker exec ${container_id} /bin/bash -c \
      "docker run --name registry-proxy -d -e LISTEN=':5000' -e TALK=\"\$(/sbin/ip route|awk '/default/ { print \$3 }'):5000\" -p 5000:5000 tecnativa/tcp-proxy"
  done
docs: https://hub.docker.com/r/tecnativa/tcp-proxy/

/sbin/ip route|awk '/default/ { print $3 }' is to get host's IP accessible from node container.

Test it:
$ kubectl run test --image=localhost:5000/alpine:3.6 -ti /bin/ash             
If you don't see a command prompt, try pressing enter.
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