docker 创建overlay网络实践

参考文档：https://docs.docker.com/engine/userguide/networking/get-started-overlay/

https://docs.docker.com/machine/drivers/generic/

1）Step 1: Set up a key-value store

docker-machine create –driver generic –generic-ip-address=192.168.153.222 \

–generic-ssh-key ~/.ssh/id_rsa mh-keystore (要配置无密码登录)

eval “$(docker-machine env mh-keystore)”

docker run -d -p “8500:8500” -h “consul” progrium/consul -server -bootstrap

2)Step 2: Create a Swarm cluster(为避免安装过程中脚本执行docker pull swarm失败，可先在机器上执行docker pull swarm镜像)

docker-machine create \

–driver generic –generic-ip-address=192.168.153.223 \

–generic-ssh-key ~/.ssh/id_rsa \

–swarm –swarm-master \

–swarm-discovery=”consul://(docker−machineipmh−keystore):8500” –engine−opt=”cluster−store=consul://(docker-machine ip mh-keystore):8500” \

–engine-opt=”cluster-advertise=eth1:2376” \

mhs-demo0

docker-machine create \

–driver generic –generic-ip-address=192.168.153.225 \

–generic-ssh-key ~/.ssh/id_rsa \

–swarm \

–swarm-discovery=”consul://(docker−machineipmh−keystore):8500” –engine−opt=”cluster−store=consul://(docker-machine ip mh-keystore):8500” \

–engine-opt=”cluster-advertise=eth1:2376” \

mhs-demo1

docker-machine ls

3)Step 3: Create the overlay Network

eval $(docker-machine env –swarm mhs-demo0)

docker info

docker network create –driver overlay –subnet=10.0.9.0/24 my-net

4)Step 4: Run an application on your Network

eval $(docker-machine env –swarm mhs-demo0)

docker run -itd –name=web –net=my-net –env=”constraint:node==mhs-demo0” nginx

eval $(docker-machine env mhs-demo1)

注：得先设定node的env，才能执行以下的docker run命令；为了节省时间，先在目标node上docker pull nginx，docker pull busybox

docker run -it –rm –net=my-net –env=”constraint:node==mhs-demo1” busybox wget -O- http://web

5)Step 5: Check external connectivity