创建service
docker service create --name demo busybox sh -c "while true;do sleep 3600;done"查看service，此时只有一个副本 replicas 1/1
docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
qbpicc7rvm49 demo replicated 1/1 busybox:latest 查看service详细信息
docker service ps demo
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
nlgymox7pt59 demo.1 busybox:latest localhost.localdomain Running Running about a minute ago 设置service副本数为5
docker service scale demo=5再次查看service，次数副本数 replicas 5/5
docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
qbpicc7rvm49 demo replicated 5/5 busybox:latest 发现启动了5个service副本，分布在3个worker node上
docker service ps demo
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
nlgymox7pt59 demo.1 busybox:latest localhost.localdomain Running Running 6 minutes ago
wjnahehppsvu demo.2 busybox:latest localhost.localdomain Running Running 2 minutes ago
ogojxvke7t9b demo.3 busybox:latest localhost.localdomain Running Running 3 minutes ago
dweehxcozoku demo.4 busybox:latest localhost.localdomain Running Running 2 minutes ago
1ix2fdj39m03 demo.5 busybox:latest localhost.localdomain Running Running 2 minutes ago我们去其中一个worker node上删除一个service副本
docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a8661d168e78 busybox:latest "sh -c 'while true;d…" 4 minutes ago Up 4 minutes demo.3.ogojxvke7t9bza62haisw3as2
2f800599e183 busybox:latest "sh -c 'while true;d…" 8 minutes ago Up 8 minutes demo.1.nlgymox7pt59vrdj7lfjk8e4b
docker rm -f 2f800599e183
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a8661d168e78 busybox:latest "sh -c 'while true;d…" 38 minutes ago Up 38 minutes demo.3.ogojxvke7t9bza62haisw3as2
然后再回到swarm manager节点上，查看service副本数变成4个，但是短暂时间后，又变回5个
docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
qbpicc7rvm49 demo replicated 5/5 busybox:latest 再查看demo副本详细信息，demo.1确实是被删除过，但是在swarm manager的管理下，某个workder node又开启了一个service的副本，保证service的副本数是有效的。
docker service ps demo
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
z5vhrcrec1d4 demo.1 busybox:latest localhost.localdomain Running Running 6 minutes ago
nlgymox7pt59 \_ demo.1 busybox:latest localhost.localdomain Shutdown Failed 6 minutes ago "task: non-zero exit (137)"
wjnahehppsvu demo.2 busybox:latest localhost.localdomain Running Running 44 minutes ago
ogojxvke7t9b demo.3 busybox:latest localhost.localdomain Running Running 44 minutes ago
dweehxcozoku demo.4 busybox:latest localhost.localdomain Running Running 44 minutes ago
1ix2fdj39m03 demo.5 busybox:latest localhost.localdomain Running Running 44 minutes ago 我们要删除service，需要在swarm manager节点上
docker service rm demo
demo
docker service ls
ID NAME MODE REPLICAS IMAGE PORTS来源：oschina
链接：https://my.oschina.net/xiaoyoung/blog/4700188