一、集群机器规划

        局域网内三台机器：

         192.9.100.127        etcd01

         192.9.100.245        etcd03

         192.168.12.180      etcd02

二、 软件安装

          每台机器执行如下操作：

          a. 下载软件 etcd-v3.0.17-linux-amd64.tar.gz  （你可以根据需要更换其他版本）

        b. 解压安装

# tar zxvf etcd-v3.0.17-linux-amd64.tar.gz
# cd etcd-v3.0.17-linux-amd64
# cp etcd /usr/bin/
# cp etcdctl /usr/bin/

# vim /usr/lib/systemd/system/etcd.service

[Unit]
Description=Etcd Service
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
Restart=on-failure
WorkingDirectory=/var/lib/etcd/
EnvironmentFile=-/etc/etcd/etcd.conf
ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /usr/bin/etcd 
--name="${ETCD_NAME}"
--data-dir="${ETCD_DATA_DIR}" 
--listen-peer-urls="${ETCD_LISTEN_PEER_URLS}" 
--listen-client-urls="${ETCD_LISTEN_CLIENT_URLS}"
--advertise-client-urls="${ETCD_ADVERTISE_CLIENT_URLS}"
--initial-cluster-token="${ETCD_INITIAL_CLUSTER_TOKEN}"
--initial-cluster="${ETCD_INITIAL_CLUSTER}" 
--initial-cluster-state="${ETCD_INITIAL_CLUSTER_STATE}""
[Install]
WantedBy=multi-user.target

            (以etcd01为例，其他节点注意对应地修改192.9.100.127 为对应节点IP，ETCD_NAME为对应节点etcd角色名)

# mkdir /etc/etcd
# vim /etc/etcd/etcd.conf

ETCD_NAME=etcd01
ETCD_DATA_DIR="/var/lib/etcd/data"
ETCD_LISTEN_PEER_URLS="http://192.9.100.127:2380"
ETCD_LISTEN_CLIENT_URLS="http://192.9.100.127:2379,http://127.0.0.1:2379"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.9.100.127:2380"
ETCD_INITIAL_CLUSTER="etcd01=http://192.9.100.127:2380,etcd02=http://192.168.12.180:2380,etcd03=http://192.9.100.245:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="kube-etcd-cluster"
ETCD_ADVERTISE_CLIENT_URLS="http://192.9.100.127:2379"

# mkdir -p /var/lib/etcd/data
# systemctl daemon-reload
# systemctl start etcd
# systemctl enable etcd

         在任意节点，执行

# etcdctl cluster-health

              只要有两个节点正常，集群即可工作)