root@manager:~# docker swarm init

root@manager:~# docker swarm init
Swarm initialized: current node (paulxq7r9czggtra5xu8006hk) is now a manager.

To add a worker to this swarm, run the following command:

    **docker swarm join --token SWMTKN-1-2xztx445xtzsj98s3p6men855x9cz5y00kalg3xc3rm4go9g18-e9fxhbcrfg73l8sqonzdtxyhu 211.183.3.200:2377**

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

저 token이 있는 node만 manager의 관리 대상이 된다. (init할 때마다 새로 발행됨)

root@worker1:~# docker swarm join --token SWMTKN-1-2xztx445xtzsj98s3p6men855x9cz5y00kalg3xc3rm4go9g18-e9fxhbcrfg73l8sqonzdtxyhu 211.183.3.200:2377

root@worker1:~# docker swarm join --token SWMTKN-1-2xztx445xtzsj98s3p6men855x9cz5y00kalg3xc3rm4go9g18-e9fxhbcrfg73l8sqonzdtxyhu 211.183.3.200:2377
This node joined a swarm as a worker.

root@worker2:~# docker swarm join --token SWMTKN-1-2xztx445xtzsj98s3p6men855x9cz5y00kalg3xc3rm4go9g18-e9fxhbcrfg73l8sqonzdtxyhu 211.183.3.200:2377

root@worker2:~# docker swarm join --token SWMTKN-1-2xztx445xtzsj98s3p6men855x9cz5y00kalg3xc3rm4go9g18-e9fxhbcrfg73l8sqonzdtxyhu 211.183.3.200:2377
This node joined a swarm as a worker.

root@manager:~# docker node ls

root@manager:~# docker node ls
ID                            HOSTNAME   STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
paulxq7r9czggtra5xu8006hk *   manager    Ready     Active         Leader           20.10.21
x19neym6sw4hijutdxkgzjhd2     worker1    Ready     Active                          20.10.21
k4hmjn37x6wmwv5xnar2lkvm9     worker2    Ready     Active                          20.10.21

worker1과 worker2가 clustering되어 manager의 orchestration 대상이 된다.

join 해제는 docker swarm leave로 한다.

root@manager:~# docker network ls

root@manager:~# docker network ls
NETWORK ID     NAME              DRIVER    SCOPE
1b25c959ba21   bridge            bridge    local
5b52fc9edfc4   docker_gwbridge   bridge    local
0e1c0dbcab96   host              host      local
ji03bjprzpxy   ingress           overlay   swarm
c109c70bf824   none              null      local

root@manager:~# docker node inspect worker1

• 출력

• docker node rm worker1

  지워짐

• docker node promote worker1

  worker1이 manager로 승격됨

root@manager:~# docker service create --replicas 2 -p 5555:80 --name web nginx

root@manager:~# docker service create --replicas 2 -p 5555:80 --name web nginx
aq2udr807dwwnv41onjccqz3c
overall progress: 2 out of 2 tasks 
1/2: running   
2/2: running   
verify: Service converged

• -service

  컨테이너에서의 run과 비슷함

root@manager:~# docker service ls

root@manager:~# docker service ls
ID             NAME      MODE         REPLICAS   IMAGE          PORTS
aq2udr807dww   web       replicated   2/2        nginx:latest   *:5555->80/tcp

브라우저 접속: http://211.183.3.200:5555/

root@manager:~# docker service scale web=4

root@manager:~# docker service scale web=4
web scaled to 4
overall progress: 4 out of 4 tasks 
1/4: running   
2/4: running   
3/4: running   
4/4: running   
verify: Service converged

2개는 이미 동작 중이므로 2개만 새로 prepare한다.

root@manager:~# docker login root@worker1:~# docker login root@worker2:~# docker login

root@manager:~# docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to <https://hub.docker.com> to create one.
Username: beyondthemist
Password: 
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
<https://docs.docker.com/engine/reference/commandline/login/#credentials-store>

Login Succeeded

로그인이 안 되어 있으면 traffic 제한이 생긴다. 이 경우 image를 못 받아 올 수 있으므로 안전빵으로 로그인하는 게 좋다.

root@manager:~# docker service rm web root@manager:~# docker service ls

root@manager:~# docker service rm web
web
root@manager:~# docker service ls
ID        NAME      MODE      REPLICAS   IMAGE     PORTS

root@manager:~# docker service create --name web --constraint node.rol1!=manager --replicas 4 nginx

root@manager:~# docker service create --name web **--constraint node.role!=manager** --replicas 4 nginx
ns3beibwav1f2trhhojvlurz8
overall progress: 4 out of 4 tasks 
1/4: running   
2/4: running   
3/4: running   
4/4: running   
verify: Service converged

• --constraint node.role!=manager

  replica 생성 시 worker node에만 생기도록 한다. 정확히는 manager가 아닌 node에만 replica가 생성되도록 한다.

root@manager:~# docker service create --name gweb --mode global nginx

root@manager:~# docker service create --name gweb **--mode global** nginx
phti24w9zporupb5ti51882qh
overall progress: 3 out of 3 tasks 
x19neym6sw4h: running   
k4hmjn37x6wm: running   
paulxq7r9czg: running   
verify: Service converged

• --mode global

  • replica

    분산 배치

  • global

    각 노드에 하나씩만 생성

    알아서 node 개수만큼 생성된다.