NGINX Ingress TCP/UDP Unreachable — Complete Guide

You encounter a nginx configuration issue that prevents your workflow from completing. This guide walks through the fix step by step.

Wrong ❌

apiVersion: v1
kind: ConfigMap
metadata: { name: tcp-services, namespace: ingress-nginx }
# Empty data section

Wrong Output

TCP services unreachable. Connection refused on expected ports.

Right ✅

apiVersion: v1
kind: ConfigMap
metadata: { name: tcp-services, namespace: ingress-nginx }
data:
  "5432": "default/postgres-service:5432"
  "6379": "default/redis-service:6379"
# Ensure controller has: --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services

Right Output

TCP services available. PostgreSQL at :5432 -> postgres-service. Redis at :6379 -> redis.

Prevention

• Create tcp-services and udp-services ConfigMaps.
• Format: "": "/:".
• Controller needs --tcp-services-configmap flag.
• Restart controller after updating configmap.
• Test with nc -v .

DodaTech applies similar defensive patterns across Doda Browser, DodaZIP, and Durga Antivirus Pro infrastructure for production reliability.

Common Mistakes with ingress tcp udp

1. Mixing let bindings with <- bindings in do notation, producing type errors
2. Overlapping type class instances that cause GHC to reject the program with ambiguous dispatch errors
3. Non-exhaustive pattern matches that compile with warnings then crash at runtime

These mistakes appear frequently in real-world NGINX code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ

This quick fix is part of the DodaTech infrastructure engineering series. Learn more at DodaTech tutorials.