OpenShift For Kubernetes Admins¶
Introduction¶
OpenShift is Kubernetes packaged with enterprise platform features such as integrated authentication, projects, Routes, Operators, image builds, monitoring, and stricter security defaults. The fastest way to learn the architecture is to inspect cluster operators and the namespaces that run platform components.
Core Concepts¶
OpenShift builds on Kubernetes with projects, Routes, ImageStreams, Builds, Operators, SCCs, and integrated platform administration.
Practical Examples¶
oc get clusteroperators
oc get nodes
oc get pods -n openshift-apiserver
oc get pods -n openshift-ingress
Example output:
NAME VERSION AVAILABLE PROGRESSING DEGRADED SINCE
authentication 4.15.12 True False False 8d
ingress 4.15.12 True False False 8d
Verification¶
oc get co
oc get clusterversion
oc get namespaces | grep openshift
Common Mistakes¶
- Looking only at the final error and ignoring events.
- Checking the wrong project with oc.
- Changing several objects at once before confirming the current state.
Quick Checklist¶
- Confirm the active project.
- Inspect the exact object named in the error.
- Read recent events.
- Apply one focused fix.
- Verify status after the change.
Related Guides¶
Summary¶
OpenShift For Kubernetes Admins is best understood through the OpenShift objects involved and the oc commands that verify their current state.