准备三个Docker环境

这里我们叫它他为 manager,node1,node2

docker环境可以用docker-machine( https://www.nongtianlang.com/post/docker-machine/ )来搭建

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manager
开一个终端
$ docker-machine create manager -d virtualbox --virtualbox-boot2docker-url=$HOME/.docker/machine/cache/boot2docker.iso
进入主机
$ docker-machine ssh manager

node1
再开一个终端
$ docker-machine create node1 -d virtualbox --virtualbox-boot2docker-url=$HOME/.docker/machine/cache/boot2docker.iso
进入主机
$ docker-machine ssh node1

node2
再开一个终端
$ docker-machine create node2 -d virtualbox --virtualbox-boot2docker-url=$HOME/.docker/machine/cache/boot2docker.iso
进入主机
$ docker-machine ssh node2

查看所有docker主机
再开一个终端
$ docker-machine ls
NAME      ACTIVE   DRIVER       STATE     URL                         SWARM   DOCKER     ERRORS
manager   -        virtualbox   Running   tcp://192.168.99.100:2376           v18.09.0   
node1     -        virtualbox   Running   tcp://192.168.99.101:2376           v18.09.0   
node2     -        virtualbox   Running   tcp://192.168.99.102:2376           v18.09.0 
可以看到三个主机的一些信息
swarm集群

manager上创建swarm

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manager主机

$ docker swarm init --advertise-addr 192.168.99.100
Swarm initialized: current node (2g055v9ayzjbabi4kazdlz36r) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-2qipc1iivmfmuxnsq293a8nlmsxo0fb6kmdvufxtne0uz5rnkw-brabjkyps2rp9vbo95k8b5r2i 192.168.99.100:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

node1加入swarm

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node1主机，使用manager上swarm创建时生成的命令

$ docker swarm join --token SWMTKN-1-2qipc1iivmfmuxnsq293a8nlmsxo0fb6kmdvufxtne0uz5rnkw-brabjkyps2rp9vbo95k8b5r2i 192.168.99.100:2377
This node joined a swarm as a worker.

node2加入swarm

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node2主机，使用manager上swarm创建时生成的命令

$ docker swarm join --token SWMTKN-1-2qipc1iivmfmuxnsq293a8nlmsxo0fb6kmdvufxtne0uz5rnkw-brabjkyps2rp9vbo95k8b5r2i 192.168.99.100:2377
This node joined a swarm as a worker.

在manager上查看所有节点

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manager主机

$ docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
2g055v9ayzjbabi4kazdlz36r *   manager             Ready               Active              Leader              18.09.0
j71an2e98s6wbalkju97ulb9m     node1               Ready               Active                                  18.09.0
kw97y6khnnvfu5wq7yb7n79yw     node2               Ready               Active                                  18.09.0

swarm集群创建成功

用host方式部署服务(mode=host)
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manager主机

$ docker service create --name my_web --replicas 3 --publish mode=host,published=8080,target=80 nginx

现在可以在浏览器中正常访问以下三个网址:
http://192.168.99.100:8080/
http://192.168.99.101:8080/
http://192.168.99.102:8080/