I have a CoreOS base Kubernetes deployment. I followed the instruction on GitHub to set up a private Docker registry: https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/registry/README.md

The registry came up and the registry proxy also came up:

$ kubectl get po --namespace=kube-system
NAME                              READY     STATUS    RESTARTS   AGE
kube-dns-v9-hd0hz                 4/4       Running   0          1d
kube-registry-proxy-10.1.52.113   1/1       Running   0          1d
kube-registry-proxy-10.1.52.114   1/1       Running   0          1d
kube-registry-proxy-10.1.52.117   1/1       Running   0          1d
kube-registry-proxy-10.1.52.118   1/1       Running   0          1d
kube-registry-v0-ib8vx            1/1       Running   0          1d
kubernetes-dashboard-17zfm        1/1       Running   0          1d

I was also able to push private image using the port-forward method (port forward to either the registry pod or the registry proxy pod.) But when I try to use the image, I get PullImageError:

kubectl run -i --tty ubuntu --image=localhost:5000/myfirstubuntu/ubuntu --restart=Never -- bash

And if I just create a new container with plain ubuntu and try to curl localhost:5000, I don't get the 404 error as shown in the instruction so looks like the pod on the same node is not talking to the registry-proxy as expected. What are the ways to further debug this?