docs(examples): add multiple containers example

README.md

@@ -56,6 +56,7 @@ The docker library that interacts with the docker deamon uses `unsafe` which mus
 
 - [Docker Classic](./examples/docker_classic/)
 - [Docker Swarm](./examples/docker_swarm/)
+- [Multiple Containers](./examples/multiple_containers/)
 
 ## Authors
 

examples/multiple_containers/README.md

@@ -0,0 +1,24 @@
+# Docker swarm
+
+## Run the demo
+
+1. `git clone git@github.com:acouvreur/traefik-ondemand-plugin.git`
+2. `cd traefik-ondemand-plugin/examples/multiple_containers`
+3. `docker swarm init`
+4. `export TRAEFIK_PILOT_TOKEN=...`
+5.  `docker stack deploy -c docker-stack.yml DOCKER_SWARM`
+6.  Load `http://localhost/nginx`
+7.  Load `http://localhost/whoami`
+8.  After 1 minute whoami is scaled to 0/0
+9.  After 5 minutes nginx is scaled to 0/0
+10. `docker stack rm DOCKER_SWARM`
+
+## Limitations
+
+### Define a middleware per service/container
+
+Due to Traefik plugin, the interface is to provide a config and a `ServeHTTP` request.
+
+This function has no access to the Traefik configuration, thus no way to determine the container/service associated to the request.
+
+See https://github.com/acouvreur/traefik-ondemand-plugin/issues/8#issuecomment-931940533.

examples/multiple_containers/docker-stack.yml

@@ -0,0 +1,65 @@
+version: "3.9"
+
+services:
+  traefik:
+    image: traefik
+    command:
+      - --api=true
+      - --api.insecure=true
+      - --pilot.token=$TRAEFIK_PILOT_TOKEN
+      - --experimental.plugins.traefik-ondemand-plugin.moduleName=github.com/acouvreur/traefik-ondemand-plugin
+      - --experimental.plugins.traefik-ondemand-plugin.version=v0.1.1
+      - --providers.docker=true
+      - --providers.docker.swarmmode=true
+      - --providers.file.filename=/etc/traefik/dynamic-config.yml
+      - --entrypoints.http.address=:80
+      - --entrypoints.https.address=:443
+    ports:
+      - "80:80"
+      - "443:443"
+      - "8080:8080"
+    volumes:
+      - '/var/run/docker.sock:/var/run/docker.sock'
+    
+  ondemand:
+    image: ghcr.io/acouvreur/traefik-ondemand-service:main
+    command:
+      - --swarmMode=true
+    volumes:
+      - '/var/run/docker.sock:/var/run/docker.sock'
+    deploy:
+      labels:
+        - traefik.enable=true
+        - traefik.http.middlewares.ondemand-nginx.plugin.traefik-ondemand-plugin.name=DOCKER_SWARM_nginx
+        - traefik.http.middlewares.ondemand-nginx.plugin.traefik-ondemand-plugin.serviceUrl=http://ondemand:10000
+        - traefik.http.middlewares.ondemand-nginx.plugin.traefik-ondemand-plugin.timeout=5m
+        - traefik.http.middlewares.ondemand-whoami.plugin.traefik-ondemand-plugin.name=DOCKER_SWARM_whoami
+        - traefik.http.middlewares.ondemand-whoami.plugin.traefik-ondemand-plugin.serviceUrl=http://ondemand:10000
+        - traefik.http.middlewares.ondemand-whoami.plugin.traefik-ondemand-plugin.timeout=1m
+        - traefik.http.services.ondemand.loadbalancer.server.port=10000
+
+  nginx:
+    image: nginx
+    deploy:
+      replicas: 0
+      labels:
+        - traefik.enable=true
+        # If you do not use the swarm load balancer, traefik will evict the service from its pool
+        # as soon as the service is 0/0. If you do not set that, fallback to dynamic-config.yml file usage.
+        - traefik.docker.lbswarm=true
+        - traefik.http.routers.nginx.middlewares=ondemand-nginx@docker
+        - traefik.http.routers.nginx.rule=PathPrefix(`/nginx`)
+        - traefik.http.services.nginx.loadbalancer.server.port=80
+
+  whoami:
+    image: containous/whoami
+    deploy:
+      replicas: 0
+      labels:
+        - traefik.enable=true
+        - traefik.docker.lbswarm=true
+        - traefik.http.routers.whoami.middlewares=ondemand-whoami@docker
+        - traefik.http.routers.whoami.rule=PathPrefix(`/whoami`)
+        - traefik.http.services.whoami.loadbalancer.server.port=80
+
+