traefik consul header matching

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README.md

traefik and consul, manual register

consul and traefik up

docker-compose up -d

services up

docker-compose -f docker-compose-services.yaml up -d

Register manually

curl --request PUT --data @consul_register_whoami1.json http://127.0.0.1:8500/v1/agent/service/register
curl --request PUT --data @consul_register_whoami2.json http://127.0.0.1:8500/v1/agent/service/register

curl to whoami passing by traefik, filter with host

curl -H "Host:whoami" 0.0.0.0

Filter with prefix

curl http://127.0.0.1/whoami-alpha

Deregister

curl --request PUT http://127.0.0.1:8500/v1/agent/service/deregister/whoami1
curl --request PUT http://127.0.0.1:8500/v1/agent/service/deregister/whoami2

References

• https://www.consul.io/api/agent/service.html#register-service
• https://docs.traefik.io/configuration/backends/consulcatalog/

consul_register_whoami1.json

{
  "ID": "whoami1",
  "Name": "whoami",
  "Address": "whoami1",
  "Check": {
    "DeregisterCriticalServiceAfter": "5m",
    "http": "http://whoami1",
    "Interval": "10s",
    "Timeout": "5s"
  },
  "Port": 80
}

consul_register_whoami2.json

{
  "ID": "whoami2",
  "Name": "whoami-alpha",
  "Address": "whoami2",
  "tags": [
    "traefik.enable=true",
    "traefik.http.routers.whoami-alpha.rule=PathPrefix(`/whoami-alpha`)",
    "traefik.http.routers.whoami-alpha.middlewares=whoami-alpha",
    "traefik.http.middlewares.whoami-alpha.stripprefix.prefixes=/whoami-alpha"
  ],
  "Port": 80
}

docker-compose-services.yaml

version: '3'

services:
    whoami1:
        image: containous/whoami
    whoami2:
        image: containous/whoami

docker-compose.yaml

version: '3'

services:
  traefik:
    image: traefik:v2.1 # The official Traefik docker image
    command: |
      --log.level=DEBUG
      -c traefik.toml #--docker # Enables the web UI and tells Traefik to listen to docker
      --api.insecure=true
      #--providers.consulcatalog=true
      #--providers.consulcatalog.refreshInterval=5s
      #--providers.consulcatalog.endpoint.address=http://consul-server-bootstrap:8500
      #--providers.consulcatalog.exposedByDefault=true
    ports:
        - "80:80"     # The HTTP port
        - "8080:8080" # The Web UI (enabled by --api)
    volumes:
        #- /var/run/docker.sock:/var/run/docker.sock # So that Traefik can listen to the Docker events
        - ${PWD}/traefik.toml:/traefik.toml

  consul-agent-1: &consul-agent
    image: consul:latest
    command: "agent -retry-join consul-server-bootstrap -client 0.0.0.0"

  consul-agent-2:
    <<: *consul-agent

  consul-agent-3:
    <<: *consul-agent

  consul-server-1: &consul-server
    <<: *consul-agent
    command: "agent -server -retry-join consul-server-bootstrap -client 0.0.0.0"

  consul-server-2:
    <<: *consul-server

  consul-server-bootstrap:
    <<: *consul-agent
    ports:
      - "8400:8400"
      - "8500:8500"
      - "8600:8600"
      - "8600:8600/udp"
    command: "agent -server -bootstrap-expect 3 -ui -client 0.0.0.0"

traefik.toml

[api]
  insecure = true

[providers.consulCatalog]
  exposedByDefault = true
  refreshInterval = "500ms"
  #defaultRule = "PathPrefix(`/{{ normalize .Name }}`)"

  [providers.consulCatalog.endpoint]
    address = "consul-server-bootstrap:8500"