[Docker] docker service create --mode 옵션

개요

docker service create 명령어에 사용되는 --mode 옵션 

구성환경

docker-ce-19.03.5 / CentOS 7.6

 

1. --mode 옵션

 value : replicated(default), global

설명

 - replicated(default, 생략가능) :  --replicas 옵션의 n 값에 따라 복제될 컨테이너수가 지정 됨

 - global : swarm에 가입하는 노드는 기존 생성된 swarm의 service를 승계 받음 

예) replicated 옵션(3개의 노드로 이루어진 swarm)

 1) swarm master 노드(node1)에서 서비스 생성 

shell> docker service create --mode replicated --replicas 5 -p 8080:80 --name my_nginx_1 nginx:latest jsg7tm7ehjg06fttgm33hfy1a 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 shell> docker ps CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES c1769d9807f2        nginx:latest        "nginx -g 'daemon of…"   16 seconds ago      Up 14 seconds       80/tcp              my_nginx_1.1.ne3xpnbh7mavxdv4p6sjx51ja shell>

 2) 다른 노드에서 생성된 컨테이너 확인

  - node2 에서 생성된 컨테이너 확인

shell> docker ps CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES c57109498d47        nginx:latest        "nginx -g 'daemon of…"   2 minutes ago       Up 2 minutes        80/tcp              my_nginx_1.2.3djlsv0toemnjamca27hjn8l2 6193f5e385e5        nginx:latest        "nginx -g 'daemon of…"   2 minutes ago       Up 2 minutes        80/tcp              my_nginx_1.4.jdo6gkt14xu36vaeo0o02q3vp shell>

 - node3 에서 생성된 컨테이너 확인

shell> docker ps CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES 6cbbff0654d1        nginx:latest        "nginx -g 'daemon of…"   2 minutes ago       Up 2 minutes        80/tcp              my_nginx_1.5.vwzjgeiejvxkki3gaekdumqqj fdefa821b4bc        nginx:latest        "nginx -g 'daemon of…"   2 minutes ago       Up 2 minutes        80/tcp              my_nginx_1.3.x9m2e4gfrrs517wkde5kb7f9f shell>

* 각 노드에 분산되어 --replicas 옵션에 설정된 값만큼 컨테이너 생성

예) global 옵션(2개의 노드로 이루어진 swarm 에 1개의 노드 추가)

 1) node1(manager 노드)에서 service 생성

shell> docker node ls ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION tabzxnado7x2fon7x67vqg7m1    node2       Ready               Active              Leader              19.03.5 qz09j7g6d6mxenvaiu35p616w *   node1             Ready               Active              Reachable           19.03.5 shell> docker service create --mode global  --name my_nginx_1 -p 8080:80 nginx:latest czn3k00r2e5u18zfxp6onppd2 overall progress: 2 out of 2 tasks tabzxnado7x2: running qz09j7g6d6mx: running verify: Service converged shell> docker service ls ID                  NAME                MODE                REPLICAS            IMAGE               PORTS czn3k00r2e5u        my_nginx_1          global              2/2                 nginx:latest        *:8080->80/tcp shell> docker ps CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES b53b4ba7ebd0        nginx:latest        "nginx -g 'daemon of…"   21 minutes ago      Up 21 minutes       80/tcp              my_nginx_1.qz09j7g6d6mxenvaiu35p616w.q8sgc8d2afnro563dbqkzz055 shell>

 2) node2 에서 생성된 컨테이너 확인

shell> docker ps CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES bf78dff1b293        nginx:latest        "nginx -g 'daemon of…"   17 minutes ago      Up 17 minutes       80/tcp              my_nginx_1.sk2c2wi0p2bqtqjfo8pbom5gf.wvax45gz79c7b7k3zqu1ax0jf shell>

 3) node3에서 swarm에 조인

shell> docker ps => 현재 생성된 컨테이너가 없음 CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES shell> docker swarm join --token SWMTKN-1-11a6xx0tp9ikxdzfponlfinetsydfjmncvo9x3zx23in2n9lxh-5puxp1z3p2hss4kimdhuviqi5 192.168.0.167:2377  => manager 노드에서 "docker swarm join-token manager" 명령어로 swarm join 명령어 확인 This node joined a swarm as a manager. shell> docker node ls ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION tabzxnado7x2fon7x67vqg7m1     node2       Ready               Active              Leader              19.03.5 sk2c2wi0p2bqtqjfo8pbom5gf *   node3       Ready               Active              Reachable           19.03.5 qz09j7g6d6mxenvaiu35p616w     node1             Ready               Active              Reachable           19.03.5 shell> docker ps CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES bf78dff1b293        nginx:latest        "nginx -g 'daemon of…"   11 seconds ago      Up 6 seconds        80/tcp              my_nginx_1.sk2c2wi0p2bqtqjfo8pbom5gf.wvax45gz79c7b7k3zqu1ax0jf shell>  docker service ls ID                  NAME                MODE                REPLICAS            IMAGE               PORTS czn3k00r2e5u        my_nginx_1          global              3/3                 nginx:latest        *:8080->80/tcp shell>