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Observability & SRE

Structured logging, metrics, tracing, health checks, and SLO-friendly instrumentation.

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Observability & SRE medium

How to Create a TCP DNS Mock Server in Python

This code creates a mock TCP DNS server that listens on a specified port, accepts probe connections, and returns a fixed DNS response header to simulate a live DNS service for testing and observability.

socket dns tcp
Python 
import socket
import threading


def handle_client(client_socket, address):
    print(f"[+] Connection from {address}")
    try:
        while True:
            data = client_socket.recv(1024)
            if not data:
                break
            print(f"[*] Received {len(data)} bytes (TCP DNS probe)")
          …
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