appendix D. Troubleshooting Istio components
Throughout the book, we frequently query the Istio agent and Pilot to get information such as the configuration of a proxy, metrics exposed by it, and so on. These queries are shown on a use-case by use-case basis and are scattered throughout the book, making it difficult for the reader to recall what port 15000, 15020, or any of the other ports are. This appendix presents all the open ports and the endpoints where you can make requests to debug, troubleshoot, or get information from either the control plane or the service proxy to understand the workings of the mesh.
D.1 Information exposed by the Istio agent
The Istio sidecar provides a lot of functionality:
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Health checking—Envoy as a proxy is ...
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