sablier/docs/plugins/traefik.md

Traefik Sablier Plugin

The Traefik Sablier Plugin in the plugin catalog.

Provider compatibility grid

Provider	Dynamic	Blocking
Docker	✅	✅
Docker Swarm	✅	✅
Kubernetes	✅	❌ #62

Prerequisites

Docker

Traefik will evict containers from its pool if they are stopped.

Meaning labels attached to containers to autodiscover them is not possible with this plugin.

You have to use the dynamic config file provider instead.

❌ You cannot do the following:

whoami:
  image: containous/whoami:v1.5.0
  labels:
    - traefik.enable
    - traefik.http.routers.whoami.rule=PathPrefix(`/whoami`)
    - traefik.http.routers.whoami.middlewares=my-sablier@file

✅ You should do the following instead:

http:
  services:
    whoami:
      loadBalancer:
        servers:
          - url: "http://whoami:80"

  routers:
    whoami:
      rule: PathPrefix(`/whoami`)
      entryPoints:
        - "http"
      middlewares:
        - my-sablier@file
      service: "whoami"

dynamic-config.yaml

Docker Swarm

Traefik will evict services from its pool if they have 0 replicas.

In order to use service labels, you have to add the following option on top of each services that will use this plugin.

See also traefik.docker.lbswarm label

services:
  whoami:
    image: containous/whoami:v1.5.0
    deploy:
      replicas: 0
      labels:
        - traefik.docker.lbswarm=true

Traefik also have allowEmptyServices option which can be used instead.

But the blocking strategy won't work for the same reasons described in #62.

Kubernetes

Traefik will evict deployments from its pool if they have 0 endpoints available.

You must use allowEmptyServices

The blocking strategy is not supported because everytime the underlying configuration changes, the whole router is regenrated, thus changing the router during a request will still map to the old router. For more details, see #62.

Install the plugin to Traefik

File (YAML)

experimental:
  plugins:
    sablier:
      moduleName: "github.com/acouvreur/sablier"
      version: "v1.7.1-beta.1"

CLI

--experimental.plugins.sablier.modulename=github.com/acouvreur/sablier
--experimental.plugins.sablier.version=v1.7.1-beta.1

Configure the plugin using the Dynamic Configuration

File (YAML)

http:
  middlewares:
    my-sablier:
      plugin:
        sablier:
          group: default
          dynamic:
            displayName: My Title
            refreshFrequency: 5s
            showDetails: "true"
            theme: hacker-terminal
          sablierUrl: http://sablier:10000
          sessionDuration: 1m

Kubernetes CRD

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: my-sablier
  namespace: my-namespace
spec:
  plugin:
    sablier:
      group: default
      dynamic:
        displayName: My Title
        refreshFrequency: 5s
        showDetails: "true"
        theme: hacker-terminal
      sablierUrl: http://sablier:10000
      sessionDuration: 1m

Configuration reference

TODO