Docker bypasses your firewall silently, and most home labs don't realize it
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Docker's port publishing mechanism bypasses UFW and other host-based firewalls by inserting rules directly into iptables FORWARD/DOCKER chains, while UFW only governs the INPUT chain. This means containers published with -p are reachable from all network devices regardless of UFW rules, and 'ufw status' still shows 'active' giving a false sense of security. Most self-hosting tutorials reinforce this pattern without warning. The fix involves writing rules to the DOCKER-USER iptables chain or using the community tool ufw-docker to properly integrate UFW with Docker's networking.
Table of contents
Docker silently reworks your firewallThe tutorial ecosystem trains users into this trapThe defaults are super reasonableHow to rectify your bad container networking291 Impressions