How can I debug “ImagePullBackOff”?

All of a sudden, I cannot deploy some images which could be deployed before. I got the following pod status:

[root@webdev2 origin]# oc get pods 
NAME                      READY     STATUS             RESTARTS   AGE 
arix-3-yjq9w              0/1       ImagePullBackOff   0          10m 
docker-registry-2-vqstm   1/1       Running            0          2d 
router-1-kvjxq            1/1       Running            0          2d 

The application just won’t start. The pod is not trying to run the container. From the Event page, I have got Back-off pulling image "172.30.84.25:5000/default/arix@sha256:d326. I have verified that I can pull the image with the tag with docker pull.

I have also checked the log of the last container. It was closed for some reason. I think the pod should at least try to restart it.

I have run out of ideas to debug the issues. What can I check more?

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