14-Docker Swarm(2)
🔴 Manual Scale Up & Down
Scale Up & Down은 컨테이너 여러개를 띄울 때, replicas 명령을 주어서 실제로 docker compose file(infrastructure as code)을 통해서 띄우는 것을 의미함
🔴 Manual Scale Up & Down : code (1)
# 서비스 생성 # web-1(이름)이라는 서비스를 create하고, nginx 3개, port number는 80:80으로 실행 sudo docker service create --replicas 3 -p 80:80 --name web-1 nginx # 서비스 확인 sudo docker service ls # 서비스 들어가 있는 process들(컨테이너 3개)이 떠 있는지 확인 sudo docker service ps web-1 # 도커 컨테이너 확인 docker container ls
🔴 Manual Scale Up & Down : code (2)
web-1을 늘리고, 줄이는 것을 손으로 직접 해봄# web-1에 있는 working하는 컨테이너를 4개 올릴 것 (참고로, 앞에서는 3개 였음) sudo docker service scale web-1=4 # 서비스 확인 sudo docker service ls sudo docker service ps web-1 # ps 확인 sudo docker ps # web-1을 5개로 올릴 것 sudo docker service scale web-1=5 # ps 확인 sudo docker ps # web-1을 2개로 내릴 것 sudo docker service scale web-1=2
🔴 Service Update : code
- 최신버전을 했다가, 서비스가 이상하게 돌아가는 경우에 보통 다운을 한다
- 따라서, 아래의 코드를 통해서 다운을 실행함 (= 원생복구)
# 띄운 service가 nginx latest(최신버전)이고, 1.14.0으로 downgrade 할 것임 sudo docker service update --image nginx:1.14.0 web-1 # ps 확인 sudo docker service ps web-1
💗 코드 및 화면결과 (1)
- 3개의 다른 machine에 swarm 띄우기 위해
docker-machine을 사용함docker-machine create node1 docker-machine create node2 docker-machine create node3 docker-machine ls # docker-machine ls 결과화면 NAME ACTIVE DRIVER STATE URL SWARM DOCKER ERRORS manager * virtualbox Running Unknown ssh command error: output : node1 - virtualbox Running tcp://192.168.99.103:2376 v19.03.12 node2 - virtualbox Running tcp://192.168.99.104:2376 v19.03.12 node3 - virtualbox Running tcp://192.168.99.105:2376 v19.03.12
💗 코드 및 화면결과 (2)
ssh명령어를 사용해서 node1에 접속하기docker-machine ssh node1 # 결과화면 ( '>') /) TC (\ Core is distributed with ABSOLUTELY NO WARRANTY. (/-_--_-\) www.tinycorelinux.net docker@node1:~$ ls docker@node1:~$ exit # node1에서 docker swram init 입력 docker@node1:~$ docker swarm init # 결과화면 --> "--advertise-addr" 옵션을 통해서 여러 addresses 중에 사용할 ip를 선택하라는 의미 Error response from daemon: could not choose an IP address to advertise since this system has multiple addresses on different interfaces (10.0.2.15 on eth0 and 192.168.99.103 on eth1) - specify one with --advertise-addr # node2, node3와 연동을 해야함으로 "192.168.99.103"의 ip를 선택하여 다시 init을 실행 docker@node1:~$ sudo docker swarm init --advertise-addr 192.168.99.103 # 결과화면 Swarm initialized: current node (893rbw5c19rogvpaxsbxpp54s) is now a manager. To add a worker to this swarm, run the following command: docker swarm join --token SWMTKN-1-40w906gt4mra8507x6hmxidexqy3fyx8ooli9r1y83utwnz45c-2f3ffdfebd9nota4uddhuq56r 192.168.99.103:2377 To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
💗 코드 및 화면결과 (3)
- command를 복사하여
node2에서 join하기# node2에 swarm join 명령어 입력 docker@node2:~$ docker swarm join --token SWMTKN-1-40w906gt4mra8507x6hmxidexqy3fyx8ooli9r1y83utwnz45c-2f3ffdfebd9nota4uddhuq56r 192.168.99.103:2377 # swarm에 worker로 접속한 결과 메세지 This node joined a swarm as a worker.
💗 코드 및 화면결과 (4)
manager&worker확인
🦒 핵심은node2에서는 worker이기 때문에 swarm command 사용이 불가능함docker@node1:~$ docker node ls # docker node ls 결과화면 ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION 893rbw5c19rogvpaxsbxpp54s * node1 Ready Active Leader 19.03.12 vxpvanegserunthyoz8ff93sh node2 Ready Active 19.03.12
💗 코드 및 화면결과 (5)
node2를 매니저로 업데이트하면, swarm 명령어를 입력할 수 있음node2는 Reachable,node1은 Leader임을 확인 할 수 있음# docker node update docker@node1:~$ docker node update --role manager node2 # docker node ls docker@node1:~$ docker node ls # 결과화면 ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION 893rbw5c19rogvpaxsbxpp54s * node1 Ready Active Leader 19.03.12 vxpvanegserunthyoz8ff93sh node2 Ready Active Reachable 19.03.12 # manager 권한의 토큰 발행 docker@node1:~$ docker swarm join-token manager # 토큰 docker swarm join --token SWMTKN-1-40w906gt4mra8507x6hmxidexqy3fyx8ooli9r1y83utwnz45c-7is96i79c2unz5h9emn5w6xx7 192.168.99.103:2377 # 토큰을 "node3"에 입력하면 manager 권한 발행 가능 docker@node3:~$ docker swarm join --token SWMTKN-1-40w906gt4mra8507x6hmxidexqy3fyx8ooli9r1y83utwnz45c-7is96i79c2unz5h9emn5w6xx7 192.168.99.103:237
💗 코드 및 화면결과 (6)
docker service실행# docker service docker@node1:~$ docker service create --replicas 3 -p 80:80 --name web-1 nginx # 결과화면 overall progress: 3 out of 3 tasks 1/3: running [==================================================>] 2/3: running [==================================================>] 3/3: running [==================================================>] verify: Service converged # docker service ls docker@node1:~$ docker service ls # 결과화면 ID NAME MODE REPLICAS IMAGE PORTS h6c57nbc4cei web-1 replicated 3/3 nginx:latest *:80->80/tcp # docker service ps web-1 docker@node1:~$ docker service ps web-1 # 결과화면 ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS xv095synxe5z web-1.1 nginx:latest node2 Running Running about a minute ago pgshro45bbfy web-1.2 nginx:latest node3 Running Running about a minute ago 3fczd9pu3v42 web-1.3 nginx:latest node1 Running Running about a minute ago # docker container ls docker@node1:~$ docker container ls # 결과화면 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d35574ca7ce5 nginx:latest "/docker-entrypoint.…" About a minute ago Up About a minute 80/tcp web-1.3.3fczd9pu3v42gsrzylepdfwj6
💗 코드 및 화면결과 (7)
web-1을 늘리고, 줄이기# docker service scale web-1=4 docker@node1:~$ docker service scale web-1=4 # 결과화면 web-1 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 # docker service ls docker@node1:~$ docker service ls # 결과화면 ID NAME MODE REPLICAS IMAGE PORTS h6c57nbc4cei web-1 replicated 4/4 nginx:latest *:80->80/tcp # docker service ps web-1 docker@node1:~$ docker service ps web-1 # 결과화면 ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS xv095synxe5z web-1.1 nginx:latest node2 Running Running 2 minutes ago pgshro45bbfy web-1.2 nginx:latest node3 Running Running 2 minutes ago 3fczd9pu3v42 web-1.3 nginx:latest node1 Running Running 2 minutes ago t3pby37p9995 web-1.4 nginx:latest node1 Running Running 24 seconds ago # docker ps docker@node1:~$ docker ps # 결과화면 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 896614422d4c nginx:latest "/docker-entrypoint.…" 35 seconds ago Up 34 seconds 80/tcp web-1.4.t3pby37p9995hblawwt94183b d35574ca7ce5 nginx:latest "/docker-entrypoint.…" 2 minutes ago Up 2 minutes 80/tcp web-1.3.3fczd9pu3v42gsrzylepdfwj6 # docker service scale web-1=5 docker@node1:~$ docker service scale web-1=5 # 결과화면 web-1 scaled to 5 overall progress: 5 out of 5 tasks 1/5: running [==================================================>] 2/5: running [==================================================>] 3/5: running [==================================================>] 4/5: running [==================================================>] 5/5: running [==================================================>] verify: Service converged # docker ps docker@node1:~$ docker ps # 결과화면 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 896614422d4c nginx:latest "/docker-entrypoint.…" 56 seconds ago Up 55 seconds 80/tcp web-1.4.t3pby37p9995hblawwt94183b d35574ca7ce5 nginx:latest "/docker-entrypoint.…" 2 minutes ago Up 2 minutes 80/tcp web-1.3.3fczd9pu3v42gsrzylepdfwj6 # docker service scale web-1=2 docker@node1:~$ docker service scale web-1=2 # 결과화면 web-1 scaled to 2 overall progress: 2 out of 2 tasks 1/2: running [==================================================>] 2/2: running [==================================================>] verify: Service converged
💗 코드 및 화면결과 (8)
Service Update# docker service update docker@node1:~$ docker service update --image nginx:1.14.0 web-1 # 결과화면 web-1 overall progress: 2 out of 2 tasks 1/2: running [==================================================>] 2/2: running [==================================================>] verify: Service converged # docker service ps web-1 docker@node1:~$ docker service ps web-1 # 결과화면 ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS lfvp0edvky5i web-1.1 nginx:1.14.0 node2 Running Running 18 seconds ago xv095synxe5z \_ web-1.1 nginx:latest node2 Shutdown Shutdown 23 seconds ago ip215vebmwwu web-1.2 nginx:1.14.0 node1 Running Running 26 seconds ago pgshro45bbfy \_ web-1.2 nginx:latest node3 Shutdown Shutdown 30 seconds ago
- [docker swarm을 사용하여 3개의 node 만들기] 참고: https://seulcode.tistory.com/243
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