Tutorials Design Patterns in C#
Service Discovery Pattern — Complete Guide
Service Discovery Pattern — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of Design Patterns in C# on Toolliyo Academy.
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Design Patterns in C# · Lesson 50 of 69
Service Discovery Pattern
GoF Core ✓ → Enterprise ✓ → Cloud & Craft
Cloud & Craft · 3 — Microservices & interviews · ~6 min · Module 6: Microservices & Cloud Patterns
What is this?
Service discovery lets clients find healthy instances via DNS, registries, or platform endpoints (Kubernetes Services).
Why should you care?
ShopNest Order pods churn; Payment must not hardcode IPs.
See it live — copy this example
Paste into a C# console or class library project and run dotnet run.
// K8s-style
Console.WriteLine("http://orders.shopnest.svc.cluster.local");
Console.WriteLine("ready pods only via readiness probe");
Console.WriteLine("client retries on connection errors");What happened?
- Platform DNS updates as pods change.
- Readiness gates traffic.
- Cache DNS responsibly and retry transient failures.
Practice next
- Use service DNS names in ShopNest configs.
- Separate liveness vs readiness.
- Retry connect failures with backoff.
- Watch endpoints during a rolling deploy.
- Add client-side timeout.
Remember
Discover via platform names. Ready endpoints only. Retry on churn.
ShopNest K8s service DNS
Payment calls orders via cluster DNS.
Outcome: Rolling deploys update targets automatically.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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