Auto-proxy - Docker mod for SWAG

This mod gives SWAG the ability to auto-detect running containers via labels and automatically enable reverse proxy for them.

Requirements:

• This mod needs the universal-docker mod installed and set up with either mapping docker.sock or setting the environment variable DOCKER_HOST=remoteaddress.
• Other containers to be auto-detected and reverse proxied should be in the same user defined bridge network as SWAG.
• Containers to be auto-detected and reverse proxied must have a label swag=enable at a minimum.
• To benefit from curated preset proxy confs we provide, the container name must match the container names that are suggested in our readme examples (ie. radarr and not Radarr-4K).

Labels:

• swag=enable - required for auto-detection
• swag_port=80 - optional - overrides internal exposed port
• swag_proto=http - optional - overrides internal proto (defaults to http)
• swag_url=containername.domain.com - optional - overrides server_name (defaults to containername.*)
• swag_auth=authelia - optional - enables auth methods (options are authelia, ldap and http for basic http auth)
• swag_auth_bypass=/api,/othersubfolder - optional - bypasses auth for selected subfolders. Comma separated, no spaces.

In SWAG docker arguments, set an environment variable DOCKER_MODS=linuxserver/mods:universal-docker|linuxserver/mods:swag-auto-proxy and either add a volume mapping for /var/run/docker.sock:/var/run/docker.sock:ro, or set an environment var DOCKER_HOST=remoteaddress.

Security Consideration:

Mapping the docker.sock, especially in a publicly accessible container is a security liability. Since this mod only needs read-only access to the docker api, the recommended method is to proxy the docker.sock via a solution like tecnativa/docker-socket-proxy, limit the access, and set DOCKER_HOST= to point to the proxy address.

Here's a sample compose yaml snippet for tecnativa/docker-socket-proxy:

  dockerproxy:
    image: ghcr.io/tecnativa/docker-socket-proxy:latest
    container_name: dockerproxy
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
    restart: unless-stopped
    environment:
      - CONTAINERS=1
      - POST=0

Then the env var in SWAG can be set as DOCKER_HOST=dockerproxy. This will allow docker cli in SWAG to be able to retrieve info on other containers, but it won't be allowed to spin up new containers.