Glossary term
What is Sidecar? Meaning for developers
A helper container running next to the main one. Example: An Envoy proxy beside each service.
Learn it properly · System DesignLesson 54: Service Discovery: How Services Find Each OtherA hard-coded IP address is out of date within minutes once containers auto-scale and redeploy all day. How services find the current, healthy addresses of each other: registries, health checks, client-side vs server-side discovery, DNS, service meshes, and shutting down without dropping requests.