traefik-avahi-helper

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traefik-avahi-helper

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A container to create mDNS CNAMEs for Traefik exposed container

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# traefik-avahi-helper

A helper container to expose proxied containers as mDNS CNAMEs that are being proxied by
the offical Traefik docker container.

It reads the same container labels as the Traefik container e.g.

```
traefik.http.routers.r1.rule=Host(`r1.docker.local`)
```

This will create a CNAME entry of `r1.docker.local`

## Installing

`docker pull hardillb/traefik-avahi-helper`

Currently there are AMD64 and ARM64 based builds.

## Running

To work this needs the following 2 volumes mounting:

` -v /var/run/docker.sock:/var/run/docker.sock`

This allows the container to monitor docker

` -v /run/dbus/system_bus_socket:/run/dbus/system_bus_socket`

And this allows the container to send d-bus commands to the host OS's Avahi daemon

```
$ docker run -d -v /var/run/docker.sock:/var/run/docker.sock -v /run/dbus/system_bus_socket:/run/dbus/system_bus_socket hardillb/traefik-avahi-helper 
```

If you prefer docker compose, here is a minimal one to get you started,

```yaml
services:
  avahi-helper:
    image: hardillb/traefik-avahi-helper
    # build: .
    # container_name: traefik-avahi_helper
    restart: unless-stopped
    hostname: avahi-helper

# for debian 13
    network_mode: host
    ipc: host
    security_opt:
      - apparmor:unconfined
      - seccomp:unconfined
    cap_add:
      - NET_ADMIN
      - NET_RAW 
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - /run/dbus/system_bus_socket:/run/dbus/system_bus_socket
```

## AppArmor

If you are running on system with AppArmor installed you may get errors about not being able to send d-bus messages. To fix this add
`--privileged` to the command line.

This is a temp workaround until I can work out a suitable policy to apply.

## Acknowledgement

This uses and borrows heavily from [mdns-publisher](https://github.com/alticelabs/mdns-publisher)

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