35. Docker Service Scale

## docker service create --name mynginx --replicas 3 -p 80:80 nginx
## docker node ls
## docker service ls
## docker service ps mynginx

## docker service update --replicas 5 --deatach=true mynginx

## docker service create --name mybusybox --replicas 2 busybox sleep 3600
## docker service update --replicas 5 mybusybox mynginx

## docker service scale mynginx=2
## docker service scale mybusybox=3 mynginx=3