Pod has been in a non-ready state for more than 15 minutes.
State Running but not ready means readiness probe fails. State Pending means pod can not be created for specific namespace and node.
Pod failed to reach reay state, depending on the readiness/liveness probes. See pod-lifecycle
Service degradation or unavailability. Pod not attached to service, thus not getting any traffic.
- Check template via
kubectl -n $NAMESPACE get pod $POD.
- Check pod events via
kubectl -n $NAMESPACE describe pod $POD.
- Check pod logs via
kubectl -n $NAMESPACE logs $POD -c $CONTAINER
- Check pod template parameters such as:
- pod priority
- resources - maybe it tries to use unavailable resource, such as GPU but there is limited number of nodes with GPU
- readiness and liveness probes may be incorrect - wrong port or command, check is failing too fast due to short timeout for response
- stuck or long running init containers
Other things to check:
- app responding extremely slow due to resource constraints such as memory too low, not enough CPU which is required on start
- app waits for other services to start, such as database
- misconfiguration causing app crash on start
- missing files such as configmaps/secrets/volumes
- read only filesystem
- wrong user permissions in container
- lack of special container capabilities (securityContext)
- app is executed in different directory than expected (for example WORKDIR from Docerkfile is not used in OpenShift)
Talk with developers or read documentation about the app, ensure to define sane default values to start the app.
See Debugging Pods