5% of Requests Failed Because the Default Bridge Has No DNS — Docker Networking

The API intermittently got 'connection refused' to Redis: Docker's default bridge network provides no DNS-based service discovery, so only IP connections work and any container restart broke name resolution. This is Docker networking deep-dive: bridge vs custom networks, DNS, ports, and overlay.

⏳ Timestamps:
0:00 - Cold open: 5% of requests
0:17 - Intro
0:24 - What Is Docker Networking
0:44 - CNM Architecture
1:25 - Bridge Networking Internals
1:57 - Docker DNS Resolution
2:18 - Docker Compose Network Defaults
3:03 - MTU Mismatch in Overlay Networks
3:56 - Overlay Networks
4:29 - macvlan & Host Networking
5:02 - iptables & Docker
5:32 - User-Defined Networks
5:59 - Published Ports
6:34 - 5% of requests
6:58 - Incident Deep-Dive: Fix
7:17 - ⚠ Gotcha: Using default bridge for multi-container apps
7:34 - ⚠ Gotcha: Using default bridge without --link
7:50 - ⚠ Gotcha: Assuming 1500 MTU on overlay networks
8:09 - ⚠ Gotcha: Using macvlan on cloud providers
8:23 - ⚠ Gotcha: Trusting ufw to block Docker published ports
8:40 - ⚠ Gotcha: Publishing port without specifying host IP
8:59 - Debugging Guide
9:19 - Interview Questions
9:47 - FAQ
10:13 - Key Takeaways
10:32 - Next up
10:47 - Wrap-up

👉 Full article + code: https://thecodeforge.io/devops/docker-networking-deep-dive/
⏭ Next up: Docker Containerization Explained (2026 Guide)

#docker #devops

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