API error (500): manifest unknown: manifest unknow

问题:

it failes to pull the image with SHA256 digest identifier

回答1:

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.

回答2:

You can apply a workaround for this issue by removing Image Change Trigger and removing the hash from image attribute in container spec.

回答3:

Modify the build config:

strategy:
    dockerStrategy:
      from:
         kind: ImageStreamTag
         name: mysql-56-centos7

Replace to:

strategy:
   dockerStrategy:
      from:
         kind: DockerImage
         name: docker.io/centos/mysql-56-centos7:latest