ErrImagePull: "unauthorized: authentication required"

Issue

• After I pushed my image to internal registry, I cannot use the image due to the authentication error to pull the image.

2017-10-05 12:08:49 +0800 SGT   2017-10-05 12:08:49 +0800 SGT   1         xxxx   Pod                 Warning   FailedSync   {kubelet NODE_NAME}            pod, skipping: failed to "StartContainer" for "POD_NAME" with ErrImagePull: "unauthorized: authentication required"

• I have confirmed that it can be pulled. Why OpenShift pod failed to pull?

# docker login -u `oc whoami` -p `oc whoami -t`  172.30.200.10:5000
Login Succeeded

# docker push 172.30.200.10:5000/test-project/hello-image:latest
  ...
5bef08742407: Pushed 
latest: digest: sha256:a7683f80fc2d475b9eaef90d1a1f5f4fdb21477e1ebbb964730122d65b77ee95 size: 1159

# docker pull 172.30.200.10:5000/test-project/hello-image:latest
Using default tag: latest
Trying to pull repository 172.30.200.10:5000/test-project/hello-image:latest ...
sha256:a7683f80fc2d475b9eaef90d1a1f5f4fdb21477e1ebbb964730122d65xxxxxxxx: Pulling from 172.30.200.10:5000/test-project/hello-image
Digest: sha256:a7683f80fc2d475b9eaef90d1a1f5f4fdb21477e1ebbb964730122dxxxxxxxxxx
Status: Image is up to date for 172.30.200.10:5000/test-project/hello-image:latest