Kube Pod Not Ready

KubePodNotReady #

Meaning #

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.

Full context

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.