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Network & Connectivity

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502 Bad Gateway

Nginx is forwarding to wrong container IPs. Get current container IPs: 
docker ps -q | xargs -n 1 docker inspect --format '{{ .Name }}: {{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}'
Find these lines: 
/docker-web-1: 172.19.0.5
/docker-api-1: 172.19.0.7
Update dify/docker/nginx/conf.d:
  • Replace http://api:5001 with http://172.19.0.7:5001
  • Replace http://web:3000 with http://172.19.0.5:3000
Restart nginx or reload configuration. Note: IPs change on container restart.

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Cannot access localhost services

Docker containers can’t reach host services via 127.0.0.1. Use your machine’s local network IP instead. Example: For OpenLLM running on host, configure Dify with http://192.168.1.100:port (your actual local IP).

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Page loads forever with CORS errors

Domain/URL changes cause cross-origin issues. Update in docker-compose.yml:
  • CONSOLE_API_URL - Backend URL for console API
  • CONSOLE_WEB_URL - Frontend URL for console web
  • SERVICE_API_URL - Service API URL
  • APP_API_URL - WebApp API backend URL
  • APP_WEB_URL - WebApp URL

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Mounting & Volumes

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Nginx configuration mount failure

Error: 
Error mounting "/run/desktop/mnt/host/d/Documents/docker/nginx/nginx.conf" to rootfs at "/etc/nginx/nginx.conf": not a directory
Clone the complete project and run from docker directory: 
git clone https://github.com/langgenius/dify.git
cd dify/docker
docker compose up -d

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Port conflicts

Port 80 already in use? Either:
  1. Stop the conflicting service (usually Apache/Nginx): 
    sudo service nginx stop
sudo service apache2 stop
  2. Or change port mapping in docker-compose.yaml: 
    ports:
  - "8080:80"  # Map to different port

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Container Management

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View background shell outputs

List running shells: 
docker exec -it docker-api-1 ls /tmp/shells/
Check shell output: 
docker exec -it docker-api-1 cat /tmp/shells/[shell-id]/output.log

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Container restart issues

After system reboot, containers may fail to connect. Ensure proper startup order: 
docker compose down
docker compose up -d
Wait for all services to be healthy before accessing.

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SSRF Proxy

The ssrf_proxy container prevents Server-Side Request Forgery attacks.

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Customize proxy rules

Edit docker/volumes/ssrf_proxy/squid.conf to add ACL rules: 
# Block access to sensitive internal IP
acl restricted_ip dst 192.168.101.19
acl localnet src 192.168.101.0/24

http_access deny restricted_ip
http_access allow localnet
http_access deny all
Restart the proxy container after changes.

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Why is SSRF_PROXY needed?

Prevents services from making unauthorized requests to internal network resources. The proxy intercepts and filters all outbound requests from sandboxed services.