docker swarm 是一个docker宿主管理软件，还有k8s和mesos 作为同类容器管理软件，在docker 10.15之后合并进docker 不用单独在安装了
https://docs.docker.com/engine/swarm/services/
VirtualBox 开3个虚拟机
主机清单
swarm01 192.168.0.127
swarm02 192.168.0.128
swarm03 192.168.0.129
安装docker
$ curl -fsSL get.docker.com -o get-docker.sh
$ sudo sh get-docker.sh –mirror Aliyun
# $ sudo sh get-docker.sh –mirror AzureChinaCloud
sudo systemctl start docker
sudo systemctl enable docker
本机3网卡，在enp0s3 192.168.0.127 bridge网卡enp0s8上开始广播
docker swarm init –advertise-addr 192.168.0.127
work加入的密码
docker swarm join –token SWMTKN-1-0wlbnf7ezi6d39j7m0sv9912ikzf13f10jgk384ttiuj6ovy88-4sjlkdp9ul3fe353b0iq0q56c 192.168.0.127:2377
docker node ls
可以发现3台加入集群的机器
起一个hello的服务
docker search alpine
docker pull registry.docker-cn.com/library/alpine
docker service create –replicas 1 –name hello busybox
毛，registry 不在了？
nginx应该有吧
docker service create –name my_web nginx
docker service ls
创建一个task
docker service create –name helloworld alpine ping www.baidu.com
docker service ls
nginx服务加一个端口
docker service update –publish-add 80 my_web
docker service scale my_web=3
做错了还可以rollback
docker service update –replicas=5 my_web
docker service update –rollback my_web
192.168.0.127-129 3台服务器30000端口都可以访问到nginx的外网NAT端口3000
这30000的端口哪里来的，容我更新下
docker service update \
–publish-add published=80,target=80 \
my_web
node 80端口可以访问鸟
docker network ls
network 有两种，bridge是对外访问的，overlay是容器内部通讯的网络
docker network create -d overlay –attachable swarm_test
增加swarm通讯网卡
创建服务的时候制定网络
docker service create \
–replicas 3 \
–network swarm_test \
–name my_web2 \
nginx
比较下2个服务的区别
docker service inspect my_web
docker service inspect my_web2
走的网络是不一样的
其他docker services的命令
https://docs.docker.com/engine/reference/commandline/service_update/
docker service create
Create a new service
docker service inspect
Display detailed information on one or more services
docker service logs
Fetch the logs of a service or task
docker service ls
List services
docker service ps
List the tasks of one or more services
docker service rm
Remove one or more services
docker service rollback
Revert changes to a service’s configuration
docker service scale
Scale one or multiple replicated services
docker service update
Update a service
