(Variable not shown in template UI) Templates when using Traefik

[flololan]

(Variable not shown in template UI) Templates when using Traefik

[flololan]

Also posted here: https://forums.portainer.io/t/templates-when-using-traefik/464

[deviantony]

Hi @flololan

If I understand correctly then the "traefik.http.routers.${NAMEOFSERVICE}.rule=Host(${HOSTNAME})" is located inside the helloworld.yml ?

Everything defined in the env property of the template will be passed to the environment (via export) when deploying a stack file, you'll want to make sure your setup works properly with the CLI first.

Something like:

export HOSTNAME=value1
export NAMEOFSERVICE=value2
docker stack deploy -c helloworld.yaml stackname

If this does not work with the CLI, Portainer won't support it as it is using the CLI behind the scenes for stack deployment.

[flololan]

Thanks for that!

I tried exactly that and while the service/stack started without issue, it seems that Traefik couldn't route properly to it. Logs showed something like:

Router defined multiple times with different configurations

Solution

Instead of (in helloworld.yml)
traefik.http.routers.${NAMEOFSERVICE}.rule=Host(`${HOSTNAME}`)
I had to add something like "helloworld-"bevore the variable.
traefik.http.routers.helloworld-${NAMEOFSERVICE}.rule=Host(`${HOSTNAME}`)

With this change the field NAMEOFSERVICE is being shown in the Templates-UI and the services/stacks run without any issues (so far).