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Alexis Couvreur b94207c56e
2 years ago
.github/workflows Update build.yml 2 years ago
img Update demo gif 2 years ago
vendor Added testify 2 years ago
.gitignore Initial commit 2 years ago
.traefik.yml Updated summary 2 years ago
LICENSE Initial commit 2 years ago Update 2 years ago
config.yml Added dev config 2 years ago
config_dev.yml Update timeout to 10 2 years ago
docker-compose.yml Set replicas to 0 by default 2 years ago
go.mod Added testify 2 years ago
go.sum Added tests 2 years ago
ondemand.go Remove debug println 2 years ago
ondemand_test.go Added tests 2 years ago
traefik.yml Added dev config 2 years ago
traefik_dev.yml Added dev config 2 years ago

Traefik Ondemand Plugin


Traefik plugin to scale down to zero containers on docker swarm.


A container may be a simple nginx server serving static pages, when no one is using it, it still consume CPU and memory.

With this plugin you can scale down to zero when there is no request for the service. It will scale back to 1 when there is a user requesting the service.


The service whoami is scaled to 0. We configured a timeout of 10 seconds.


Run the demo

use watch -n 1 docker service ls to see in real time the service getting downscaled

  1. docker swarm init
  2. export TRAEFIK_PILOT_TOKEN=your_traefik_pilot_token
  3. docker stack deploy -c docker-compose.yml TRAEFIK_HACKATHON
  4. Go to localhost:8000/whoami --> service is starting
  5. Refresh --> service is responding
  6. wait 10 seconds
  7. Refresh --> service is starting again because it was scaled down to 0


  • serviceUrl the traefik-ondemand-service url (e.g. http://ondemand:10000)
  • name the service to scale on demand name (docker service ls)
  • timeout (default: 60) timeout in seconds for the service to be scaled down to zero after the last request

See config.yml and docker-compose.yml for full configuration.


Cannot use service labels

You cannot set the labels for a service inside the service definition.

Otherwise when scaling to 0 the specification would not be found because there is no more task running. So you have to write it under the dynamic configuration file.

The need of "traefik-ondemand-service"

We are running "traefik-ondemand-service" to interact freely with the docker deamon and manage an independant lifecycle from traefik.

We may try to update this plugin to embed the scaling behavior in a future.

-> The source is available at


  • Embed "traefik-ondemand-service" inside the plugin directly
  • Scale up service (max replica, threshold)
  • Scale down from N to 1 (threshold)
  • Kubernetes integration
  • Add configuration sample with plugin in non dev mode


Alexis Couvreur (left) and Alexandre Hiltcher (right)

Alexandre and Alexis