Status: Resolved
Date: 2026-05-27
Affected service: Caddy

After restarting the Caddy container, it failed to start with:

Bind for 0.0.0.0:80 failed: port is already allocated

All services at folk.zone subdomains returned 502 Bad Gateway.

Coolify's built-in Traefik proxy was already bound to port 80 on the host. Both Caddy and Traefik were trying to bind the same host port.

Changed Caddy's host port mapping in docker-compose.yml from 80:80 to 8082:80. The container still listens on port 80 internally, so Cloudflare Tunnel (which connects via the Docker network using caddy:80) required no changes.

# docker-compose.yml
caddy:
  ports:
    - "8082:80"  # was "80:80"

• Homelab Troubleshooting Index

• Caddy
• Coolify
• Return to wiki home