Traefik Proxy

Docker 기반 서비스 자동 감지 및 요청을 처리하는 Reverse proxy

Traefik Proxy

• https://doc.traefik.io/traefik/
• docker.sock 을 통해 Rule 기반 서비스를 찾고 요청을 처리함
• Docker 이외에 Kubernetes, Docker Swarm, AWS, Mesos, Marathon 등을 지원

Quick Start

• https://doc.traefik.io/traefik/getting-started/quick-start/

docker-compose.yml

• reverse-proxy : traefik reverse proxy 서비스
  • Docker Out of Docker (DooD) 같은 형태로 서비스 감지
  • 서비스와 같은 Docker network 내에 있어야 호출이 가능
• whoami : Client 호출정보를 보여주는 간단한 서비스
  • labels 을 통해 whoami 서비스 Rule 등록
  • Host 기반 Rule 적용 : "traefik.http.routers.whoami.rule=Host(whoami.localhost)"
    • traefik.http.routers.<router_name>.rule=
    • Docker Routers 규칙
    • Rule 종류
  • 서비스에 Port 가 노출 되어야 함 : Expose port (or Publish port)

version: '3'

services:
  reverse-proxy:
    # The official v2 Traefik docker image
    image: traefik:v2.6
    # Enables the web UI and tells Traefik to listen to docker
    command: --api.insecure=true --providers.docker
    ports:
      # The HTTP port
      - "80:80"
      # The Web UI (enabled by --api.insecure=true)
      - "8080:8080"
    volumes:
      # So that Traefik can listen to the Docker events
      - /var/run/docker.sock:/var/run/docker.sock

  whoami:
    # A container that exposes an API to show its IP address
    image: traefik/whoami
    labels:
      - "traefik.http.routers.whoami.rule=Host(`whoami.localhost`)"

# reverse-proxy 서비스 시작 
$ docker-compose up -d reverse-proxy

# whoami 서비스 시작
$ docker-compose up -d whoami

$ docker ps 
CONTAINER ID   IMAGE            COMMAND     CREATED          STATUS         PORTS   NAMES
e457ff5e01cb   traefik/whoami   "/whoami"   59 minutes ago   Up 59 minutes  80/tcp  traefik_whoami_1

Dashboard Router 확인

Test

$ curl -H Host:whoami.localhost localhost
Hostname: e457ff5e01cb
IP: 127.0.0.1
IP: 172.18.0.4
RemoteAddr: 172.18.0.3:56928
GET / HTTP/1.1
Host: whoami.localhost
User-Agent: curl/7.77.0
Accept: */*
Accept-Encoding: gzip
X-Forwarded-For: 172.18.0.1
X-Forwarded-Host: whoami.localhost
X-Forwarded-Port: 80
X-Forwarded-Proto: http
X-Forwarded-Server: 4c17ac309109
X-Real-Ip: 172.18.0.1

---

Yaml 파일 분리

• Docker network 생성 후, 같은 Network 에서 서비스 시작
• whoami 서비스에 replicas 적용 테스트

같은 Docker network 에 있어야 호출이 가능함

Port가 Expose만 되어도 호출이 가능하므로, 여러개의 인스턴스를 실행 할 수 있음

$ docker network create traefik_network

$ docker network ls
NETWORK ID     NAME                    DRIVER    SCOPE
f27ea9f9e602   bridge                  bridge    local
efde6948625c   host                    host      local
1ad7a260c513   none                    null      local
fdd561c514ee   traefik_network         bridge    local

reverse-proxy

version: '3'

services:
  reverse-proxy:
    # The official v2 Traefik docker image
    image: traefik:v2.6
    # Enables the web UI and tells Traefik to listen to docker
    command: --api.insecure=true --providers.docker
    ports:
      # The HTTP port
      - "80:80"
      # The Web UI (enabled by --api.insecure=true)
      - "8080:8080"
    volumes:
      # So that Traefik can listen to the Docker events
      - /var/run/docker.sock:/var/run/docker.sock

networks:
  default:
    external:
      name: traefik_network

whoami

version: '3'

services:
  whoami:
    # A container that exposes an API to show its IP address
    image: traefik/whoami
    labels:
      - "traefik.http.routers.whoami.rule=Host(`whoami.localhost`)"
    deploy:
      replicas: 4

networks:
  default:
    external:
      name: traefik_network

$ docker ps
CONTAINER ID   IMAGE            COMMAND     CREATED        STATUS        PORTS    NAMES
95c2a5aea831   traefik/whoami   "/whoami"   4 seconds ago  Up 3 seconds  80/tcp   traefik_whoami_3
406e1342044e   traefik/whoami   "/whoami"   4 seconds ago  Up 3 seconds  80/tcp   traefik_whoami_4
790f19b04598   traefik/whoami   "/whoami"   4 seconds ago  Up 3 seconds  80/tcp   traefik_whoami_2
9d764c51212e   traefik/whoami   "/whoami"   4 seconds ago  Up 3 seconds  80/tcp   traefik_whoami_1

$ curl -s -H Host:whoami.localhost localhost | grep Hostname
Hostname: 790f19b04598
$ curl -s -H Host:whoami.localhost localhost | grep Hostname
Hostname: 95c2a5aea831
$ curl -s -H Host:whoami.localhost localhost | grep Hostname
Hostname: 9d764c51212e
$ curl -s -H Host:whoami.localhost localhost | grep Hostname
Hostname: 406e1342044e

Dashboard 서비스 확인