データセンタプログラミング13

13-Docker Swarm(1)

・Docker Swarmを行うためには、ドック&ドックマシンを1台取り付ける必要があります.

Orchestrationにはmanagerがあり、これはymlファイルを確保し、ymlファイルに基づいてコンテナを画像制御で運搬する作業者のパターンである.

そのため、ドッキングマシンを使用してノードを取得し、実際のサービスはdocker composite ymlファイルから作成され、下図のように実行される.

# Docker Toolbox 설치 후 IP를 못 얻어오는 경우
$ docker-machine rm default 
$ docker-machine create --driver virtualbox default
# Create docker machines
docker-machine create --driver virtualbox manager
docker-machine create --driver virtualbox worker1
docker-machine create --driver virtualbox worker2
# check docker machines
docker-machine ls
docker-machine ip manager
docker-machine worker1
docker-machine worker2
docker-machine ssh manager
docker-machine ssh worker1
docker-machine ssh worker2
# define manager node(1)
docker-machine ssh {manager name} \ docker swarm init--advertise-addr {manager ip}
docker-machine ssh manager \
docker swarm init --advertise-addr ###.###.##.###

# swarm node management by manager
docker-machine ssh manager \ docker node --help
docker-machine ssh manager \ docker node --ls
# docker swarm joining at worker machine
docker-machine ssh {worker name} \ docker swarm join ---token <token> <manager ip>:####

# create docker-compose.yml
version: "3.7"
services:
# 웹서버가 하나가 이미지로 들어가 있음
 webserver:
 # 이미지는 nginx 최신 버전임
    image: nginx:latest
    deploy:
    # 4개의 컨테이너로 띄워달라는 의미
      replicas: 4
      # placement는 규칙임
      placement:
      # manager인 경우, 웹서버 일을 하지 않도록 명령
        constraints: [node.role != manager]
    ports:
     -8080:80

# Copy docker-compose.yml into manager (yml 파일 주기)
docker-machine scp docker-compose.yml manager:~
# Deploy application stack through manager (일해~)
docker-machine ssh manager \
docker stack deploy -c docker-compose.yml helloswarm
# Check stack deployment status
docker-machine ssh manager \ docker stack ls

docker service ls
docker service ps helloswarm
docker service ps helloswarm_webserver

# deployed stack release
docker-machine ssh manager \
docker stack rm helloswarm

# worker node leave a joined swarm
docker-machine ssh {worker name} \ docker swarm leave
# start
docker-machine ssh worker1 \ docker swarm leave
docker-machine ssh worker2 \ docker swarm leave

docker-machine stop
docker-machine rm