Docker Swarm 간단 사용법

By | 2020년 6월 30일

# 필요환경

  • docker 가 설치된 인스턴스 (2대 이상)
  • 인스턴스간에 네트워크가 연결되어 있어야 함.

# plan

  • 1대의 manager node
  • n대의 worker node

# 구성하기

– manager 노드에서 docker swarm init 실행 (아이피가 여러개일 경우 –advertise-addr 옵션을 이용해 ip 지정)


ubuntu@ip-10-0-10-175:~$ docker swarm init --advertise-addr=10.0.10.175
Swarm initialized: current node (ysc8hse6ug9erplpbyole0vrk) is now a manager.

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

    docker swarm join --token SWMTKN-1-4x40s3vahcusgm2e5im6l1dpr1cbsqxxhxjgvmn4d6uoog4e9n-50i4oabb2qagdv2g1klbow086 10.0.10.175:2377

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

– worker 노드에 join 명령 실행 (위 manager에서 init 시에 나온 명령)

ubuntu@ip-10-0-50-90:~$ docker swarm join --token SWMTKN-1-4x40s3vahcusgm2e5im6l1dpr1cbsqxxhxjgvmn4d6uoog4e9n-50i4oabb2qagdv2g1klbow086 10.0.10.175:2377
This node joined a swarm as a worker.
ubuntu@ip-10-0-50-89:~$ docker swarm join --token SWMTKN-1-4x40s3vahcusgm2e5im6l1dpr1cbsqxxhxjgvmn4d6uoog4e9n-50i4oabb2qagdv2g1klbow086 10.0.10.175:2377
This node joined a swarm as a worker.

– 연결된 노드 확인

ubuntu@ip-10-0-10-175:~$ docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
ysc8hse6ug9erplpbyole0vrk *   ip-10-0-10-175      Ready               Active              Leader              19.03.6
9duven5prcw1so9ml7s3f1hyu     ip-10-0-50-89       Ready               Active                                  19.03.6
nh4vdukkdpm9kcswyzel5mkoa     ip-10-0-50-90       Ready               Active                                  19.03.6
jt78plqlkcrmcb27nx1v8klf6     ip-10-0-50-105      Ready               Active                                  19.03.6
4t9r1m1ee6gidj720ww8ibmc5     ip-10-0-50-117      Ready               Active                                  19.03.6
ymwovr8eztucql8gcfi5qt0un     ip-10-0-50-158      Ready               Active                                  19.03.6
p320doyyx2chwrb9zxb7yinjw     ip-10-0-50-181      Ready               Active                                  19.03.6
senx8ljz73kunjwd592jiyawr     ip-10-0-50-220      Ready               Active                                  19.03.6
7gzwbybb7h2y8lg0loojawtpx     ip-10-0-50-241      Ready               Active                                  19.03.6

– 클러스터 만들기 – nginx cluster

ubuntu@ip-10-0-10-175:~$ docker service create --name nginx-cluster -p 8080:80 --replicas 2 nginx:latest
okbw4y4hqe7btwzqbn56r7puu
overall progress: 2 out of 2 tasks 
1/2: running   [==================================================>] 
2/2: running   [==================================================>] 
verify: Service converged 

– 상태확인

ubuntu@ip-10-0-10-175:~$ docker service ls
ID                  NAME                MODE                REPLICAS            IMAGE               PORTS
okbw4y4hqe7b        nginx-cluster       replicated          2/2                 nginx:latest        *:8080->80/tcp

8080 -> 80 으로 포워딩 해주는 docker 컨테이너가 실행되었다.

2대의 노드에만 container 가 올라갔지만 모든 노드에서 8080번이 호출가능하다. (자동으로 해당 서버로 라우팅 해준다)

– replica 변경

ubuntu@ip-10-0-10-175:~$ docker service update --replicas=3 nginx-cluster
nginx-cluster
overall progress: 3 out of 3 tasks 
1/3: running   [==================================================>] 
2/3: running   [==================================================>] 
3/3: running   [==================================================>] 
verify: Service converged 

– 어떤 노드들에서 실행되었는지 확인

ubuntu@ip-10-0-10-175:~$ docker service ps nginx-cluster
ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE                ERROR               PORTS
lkwjt03yjbai        nginx-cluster.1     nginx:latest        ip-10-0-50-90       Running             Running 2 hours ago                              
f3ynriukyg2y        nginx-cluster.2     nginx:latest        ip-10-0-50-117      Running             Running 2 hours ago                              
fxhrqhlej97k        nginx-cluster.3     nginx:latest        ip-10-0-50-158      Running             Running about a minute ago   

** 해당 노드수보다 replica가 많을 경우 한 서버에 여러개가 뜰 수 있음.

– 서비스 제거

ubuntu@ip-10-0-10-175:~$ docker service rm nginx-cluster
nginx-cluster

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