How does docker compare to openshift?

The primary difference is that Docker as a project is focused on the runtime container only, whereas OpenShift (as a system) includes both the runtime container as well as the REST API, coordination, and web interfaces to deploy and manage individual containers. Comparing just the runtime containers, OpenShift and Docker both use kernel isolation features … Read more

How to debug “ImagePullBackOff”?

You can use the ‘describe pod‘ syntax For OpenShift use: For vanilla Kubernetes: Examine the events of the output. In my case it shows Back-off pulling image unreachableserver/nginx:1.14.22222 In this case the image unreachableserver/nginx:1.14.22222 can not be pulled from the Internet because there is no Docker registry unreachableserver and the image nginx:1.14.22222 does not exist. … Read more