sidecar pattern
Run a helper process in the same pod / unit as your main application — handles cross-cutting concerns (TLS, auth, observability, retries) without polluting the application code. The application stays focused on business logic; the sidecar handles platform concerns.
Run a helper process in the same pod / unit as your main application — handles cross-cutting concerns (TLS, auth, observability, retries) without polluting the application code. The application stays focused on business logic; the sidecar handles platform concerns.
symptoms
- cross-cutting concerns scattered across every service in every language
- inconsistent retry/timeout/logging across services
- platform team can't roll out fixes without coordinating with every team
causes
- no shared platform layer
- language polyglot prevents shared libraries
fixes
- service mesh (Istio, Linkerd) injects sidecars
- sidecar handles TLS, retries, observability, circuit-breaking
- application becomes language-agnostic
you might say
- sidecar
- envoy proxy
- inject the sidecar