it failes to pull the image with SHA256 digest identifier
Unfortunately this is a side-effect of DockerHub removing backwards compatibility for Docker 1.9 daemons. When images are pushed using Docker 1.10, pull-by-id will fail for older daemons (which includes OpenShift masters importing metadata from the Hub). You can work around this by pulling the centos image and pushing it to the internal registry.
At the current time, using Docker 1.9 on your hosts will avoid this issue.
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