Troubleshooting and Operations
Diagnose Kubernetes services and operational issues.
-
Find the Cause of Kubernetes ImagePullBackOff
Read Pod events to distinguish missing images, registry authentication failures, network errors and image reference problems.
-
[Kubernetes Lab 09] Diagnose Pod Failures and Drain a Node
Use Pod events, logs and node conditions to diagnose a failure, then drain and return a worker node to service.
-
[Kubernetes Lab 10] Restore etcd and Application Files; Apply Patch Upgrades
Back up and restore etcd and local PV files separately, then follow the patch upgrade order for a single-control-plane Kubernetes lab.
-
Troubleshooting CoreDNS Resolution Failures in Kubernetes
Trace Kubernetes DNS failures from Pod resolver settings to CoreDNS endpoints, upstream resolvers, and NetworkPolicy rules.