本文前提条件是你在每台使用机器中已经装好了docker环境

机器环境变量设置

每台机器设置以下环境变量

export ETCD_VERSION=v3.1.0-alpha.1
export TOKEN=my-etcd-token
export CLUSTER_STATE=new
export NAME_1=etcd-node-0
export NAME_2=etcd-node-1
export NAME_3=etcd-node-2
export HOST_1=192.168.56.101
export HOST_2=192.168.56.104
export HOST_3=192.168.56.105
export CLUSTER=${NAME_1}=http://${HOST_1}:2380,${NAME_2}=http://${HOST_2}:2380,${NAME_3}=http://${HOST_3}:2380

每个机器安装etcd容器

进入HOST_1机器，设置环境变量和起容器。

export THIS_NAME=${NAME_1}
export THIS_IP=${HOST_1}
sudo docker run -d --net=host --name etcd quay.io/coreos/etcd:${ETCD_VERSION} 
/usr/local/bin/etcd 
--data-dir=data.etcd --name ${THIS_NAME} 
--initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://${THIS_IP}:2380 
--advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://${THIS_IP}:2379 
--initial-cluster ${CLUSTER} 
--initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN}

进入HOST_2机器，设置环境变量和起容器

export THIS_NAME=${NAME_2}
export THIS_IP=${HOST_2}
sudo docker run --net=host -d --name etcd quay.io/coreos/etcd:${ETCD_VERSION} 
/usr/local/bin/etcd 
--data-dir=data.etcd --name ${THIS_NAME} 
--initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://${THIS_IP}:2380 
--advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://${THIS_IP}:2379 
--initial-cluster ${CLUSTER} 
--initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN}

进入HOST_3机器，设置环境变量和起容器

export THIS_NAME=${NAME_3}
export THIS_IP=${HOST_3}
sudo docker run --net=host -d --name etcd quay.io/coreos/etcd:${ETCD_VERSION} 
/usr/local/bin/etcd 
--data-dir=data.etcd --name ${THIS_NAME} 
--initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://${THIS_IP}:2380 
--advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://${THIS_IP}:2379 
--initial-cluster ${CLUSTER} 
--initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN}

测试集群运行情况：

docker exec etcd /bin/sh -c "export ETCDCTL_API=3 && /usr/local/bin/etcdctl put foo bar"

本文来自：http://blog.yiyun.pro

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