Traefik - Generic labels to prevent compose.yml growth and copy/paste
madness ?
reddit / selfhosted

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niawagj · 2023-12-20 16:29

Hi, I've spent some times searching for this and found some leads
(with default rule) but I'm still not sure if what I'm trying to
achieve is possible, hence my question!
I'd like to write generic labels for traefik in service definition
(docker compose, standalone) to replace this:
```
labels:
      - "traefik.enable=true"
      - "traefik.http.routers.kumanuc-rtr.entrypoints=https"
      - "traefik.http.routers.kumanuc-
rtr.rule=Host(kumanuc.mydomain.com)"
      - "traefik.http.routers.kumanuc-rtr.tls=true"
      - "traefik.http.routers.kumanuc-rtr.service=kumanuc-svc"
      - "traefik.http.routers.kumanuc-rtr.middlewares=localip"
```
By something like this, the  would be a variable read when running'
docker compose up' :
```
labels:
      - "traefik.enable=true"     
      - "traefik.http.routers.-rtr.entrypoints=https"
      - "traefik.http.routers.-rtr.rule=Host(.mydomain.com)"
      - "traefik.http.routers.-rtr.tls=true"
      - "traefik.http.routers.-rtr.service=-svc"       -
"traefik.http.routers.-rtr.middlewares=localip"
```
If I can do this, then I can move all this in an extension
(https://docs.docker.com/compose/compose-file/11-extension/) at the
top of my compose file and just call them when needed. It would look
like that:
```
x-traefik-labels: &traefik-labels
  labels:
      - "traefik.enable=true"
      - "traefik.http.routers.-rtr.entrypoints=https"
      - "traefik.http.routers.-rtr.rule=Host(.mydomain.com)"
      - "traefik.http.routers.-rtr.tls=true"
      - "traefik.http.routers.-rtr.service=-svc"
      - "traefik.http.routers.-rtr.middlewares=localip"
services:
  kuma:
    image: louislam/uptime-kuma:latest
    container_name: kuma
    volumes:
      - ./kuma:/app/data
    <<: *traefik-labels
  jellyfin:
    container_name: jellyfin
    image: jellyfin/jellyfin:latest
    volumes:
      - ./jellyfin/config:/config
      - ./jellyfin/cache:/cache
      - /mnt/multimedia:/media
    devices:
      - /dev/dri/renderD128:/dev/dri/renderD128
      - /dev/dri/card0:/dev/dri/card0
    <<: *traefik-labels ...
```
Does anyone know if this is possible ?
PS: I tried to post it in /traefik but my karma is too low so I came
here because I think lots of selfhosted enthousiasts are using docker
and traefik

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sk1nT7 · 2023-12-20 17:51

Unsure whether it helps but my traefik static config holds many
defaults, which then must not be defined as label later on.

You can enable or set the default route for the docker provider and
therefore neglect specifying the hostname. You can also define the
default middlewares enabled for all proxy hosts. SSL/TLS auto redirect
is in my case always on, so no need to add any additional rewrite
rules. You can also define the default network for traefik.

Here the example config:

https://github.com/Haxxnet/Compose-
Examples/tree/main/examples%2Ftraefik

For a new service, I only have a subset of labels to set. Basically
enable traefik to expose the service, maybe overwrite the subdomain to
listen on and then some specifics like the service listening port or
whether I want to increase the upload max size or some non-default
middlewares. The template can be found here:

https://github.com/Haxxnet/Compose-
Examples/blob/main/0_skeleton%2Fdocker-compose.yml#L27-L39

That's just my way of doing it.

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niawagj · 2023-12-21 08:07

>Thanks for your help, I'll look into it and adapt it to my setup to
see how much it help reducing the copy/paste frenzy!