docker swarm mode 구성
description:
To use Docker in swarm mode, install Docker. See installation instructions for all operating systems and platforms.
Current versions of Docker include swarm mode for natively managing a cluster of Docker Engines called a swarm. Use the Docker CLI to create a swarm, deploy application services to a swarm, and manage swarm behavior.
If you are using a Docker version prior to 1.12.0, you can use standalone swarm, but we recommend updating.
official page: https://docs.docker.com/engine/swarm/
vm 준비
docker-manager 192.168.192.10
docker-worker01 192.168.192.20
docker-worker02 192.168.192.30
3대의 vm 에는 docker가 설치 되어 있습니다.
Docker-manager test@docker-manager:~$ docker -v Docker version 18.02.0-ce, build fc4de44 test@docker-manager:~$ Docker-worker01 test@docker-worker01:~$ docker -v Docker version 18.02.0-ce, build fc4de44 test@docker-worker01:~$ Docker-worker02 test@docker-worker02:~$ docker -v Docker version 18.02.0-ce, build fc4de44 test@docker-worker02:~$
1. Create Docker Swarm cluster
docker-manager 에서 작업
command : docker swarm init –advertise-addr $docker-manager ip
test@docker-manager:~$ docker swarm init --advertise-addr 192.168.192.10
Swarm initialized: current node (mzsiydsvbyhafre4cppmfupvb) is now a manager.
To add a worker to this swarm, run the following command:
docker swarm join --token SWMTKN-1-5ar8gen44ij5gi7hlkmbbhdji2e06nvod2u86e5db7zwip9707-8f5nxu48rh841xdcj0na1vp0s 192.168.192.10:2377
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
test@docker-manager:~$
docker manager node 확인
test@docker-manager:~$ docker node ls ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS mzsiydsvbyhafre4cppmfupvb * docker-manager Ready Active Leader test@docker-manager:~$ test@docker-manager:~$ docker info Containers: 1 ~중략 Swarm: active NodeID: mzsiydsvbyhafre4cppmfupvb Is Manager: true ClusterID: rnqp34pegl5rj9fqd1ex30x0h Managers: 1 Nodes: 1 Orchestration: Task History Retention Limit: 5 Raft: Snapshot Interval: 10000 Number of Old Snapshots to Retain: 0 Heartbeat Tick: 1 Election Tick: 3 Dispatcher: Heartbeat Period: 5 seconds CA Configuration: Expiry Duration: 3 months Force Rotate: 0 Autolock Managers: false Root Rotation In Progress: false Node Address: 192.168.192.10 Manager Addresses: 192.168.192.10:2377 ~중략
join-token 생성
docker-manager host 에서 작업
test@docker-manager:~$ docker swarm join-token worker
To add a worker to this swarm, run the following command:
docker swarm join --token SWMTKN-1-5ar8gen44ij5gi7hlkmbbhdji2e06nvod2u86e5db7zwip9707-8f5nxu48rh841xdcj0na1vp0s 192.168.192.10:2377
test@docker-manager:~$
docker-worker swarm 등록
docker-manager에서 생성한 join-token을 이용하여 worker node 를 등록 합니다.
docker-worker01 host 에서 작업
test@docker-worker01:~$ docker swarm join --token SWMTKN-1-5ar8gen44ij5gi7hlkmbbhdji2e06nvod2u86e5db7zwip9707-8f5nxu48rh841xdcj0na1vp0s 192.168.192.10:2377 This node joined a swarm as a worker. test@docker-worker01:~$ docker info |grep -i swarm WARNING: No swap limit support Swarm: active
docker-worker02 host 에서 작업
test@docker-worker02:~$ docker swarm join --token SWMTKN-1-5ar8gen44ij5gi7hlkmbbhdji2e06nvod2u86e5db7zwip9707-8f5nxu48rh841xdcj0na1vp0s 192.168.192.10:2377 This node joined a swarm as a worker. test@docker-worker02:~$ docker info |grep -i swarm WARNING: No swap limit support Swarm: active test@docker-worker02:~$
docker-manager node 확인
test@docker-manager:~$ docker node ls ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS mzsiydsvbyhafre4cppmfupvb * docker-manager Ready Active Leader jvitfs6bmgr699p3nltzok0fw docker-worker01 Ready Active hwkew1ktumxynqhqexjx5gn8l docker-worker02 Ready Active test@docker-manager:~$
nginx test
docker run 의 경우 아래와 같이 사용하지만 docker swarm 의 경우 docker service create 명령어를 사용합니다.
docker run 실행시는 아래와 같이 사용 합니다. docker swarm 에서는 docker service create 명령어를 사용합니다. 🙂
test@docker-test:~$ docker run --name web-service -d -p 80:80 -p 443:443 nginx
docker service create 명령어
test@docker-manager:~$ docker service create --name web-service -p 80:80 -p 443:443 nginx pgdc990uyesjmw399ayuraie9 overall progress: 1 out of 1 tasks 1/1: running [==================================================>] verify: Service converged test@docker-manager:~$
!!! docker service create 명령어 사용시 –publish 옵션을 사용해야 합니다.
test@docker-master:~$ docker service create --name web-service --publish 80:80 nginx md8pzk0owb4s8ida55voqzlrb overall progress: 1 out of 1 tasks 1/1: running [==================================================>] verify: Service converged test@docker-master:~$
service 확인
test@docker-manager:~$ docker service ls ID NAME MODE REPLICAS IMAGE PORTS pgdc990uyesj web-service replicated 1/1 nginx:latest *:80->80/tcp, *:443->443/tcp test@docker-manager:~$ docker service ps web-service ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS wd1vyqp9eg2x web-service.1 nginx:latest docker-manager Running Running 29 seconds ago test@docker-manager:~$
docker service scale 명령어를 사용하여 service 개수를 늘려 줍니다.
service 갯수를 줄일때도 동일하게 scale을 사용 합니다.
test@docker-manager:~$ docker service scale web-service=3 web-service scaled to 3 overall progress: 3 out of 3 tasks 1/3: running [==================================================>] 2/3: running [==================================================>] 3/3: running [==================================================>] verify: Service converged test@docker-manager:~$ test@docker-manager:~$ docker service ps web-service ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS wd1vyqp9eg2x web-service.1 nginx:latest docker-manager Running Running 20 minutes ago bezi55mn78lf web-service.2 nginx:latest docker-worker01 Running Running 42 seconds ago vwpxbid1ez53 web-service.3 nginx:latest docker-worker02 Running Running 42 seconds ago test@docker-manager:~$
docker service rm
swarm 에서 사용중인 컨테이너 삭제시는 docker servier rm $service_name 으로 삭제 할수 있습니다.
test@docker-manager:~$ docker service ls ID NAME MODE REPLICAS IMAGE PORTS pgdc990uyesj web-service replicated 1/1 nginx:latest *:80->80/tcp, *:443->443/tcp test@docker-manager:~$ docker service rm web-service web-service test@docker-manager:~$ docker service ls ID NAME MODE REPLICAS IMAGE PORTS test@docker-manager:~$