Cilium Debugging Quick Reference
This page collects the cilium debugging commands actually used throughout this tutorial series, each with a one-sentence purpose and a copyable command for quick troubleshooting. Commands are organized for cilium 1.20 (the currently verified version of this tutorial series), and every subcommand has been cross-checked against that version's source.
Troubleshooting: Connecting to APIServer Returns "operation not permitted"
Symptoms
Troubleshooting: Webhook Connection Timeout in Overlay Mode
Applies to TKE managed clusters using an Overlay plan (VPC-CNI or GR): apiserver calls to ValidatingWebhook / MutatingWebhook time out.