etcd就两个可执行文件（截至到3.0.15前）。
下载地址：https://github.com/coreos/etcd/releases
注：etcd可以集群安装，在这里只想做一个单机测试，所以只是启动一个节点就可以。
1. 解压，并将文件放入系统路径中：
tar zxvf etcd-v3.0.15-linux-amd64.tar.gz
cp etcd /usr/bin/
cp etcdctl /usr/bin/
2. 创建一个服务描述文件，放入systemd的服务目录下
cat /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Server
After=network.target
[Service]
Type=simple
WorkingDirectory=/var/lib/etcd/
EnvironmentFile=-/etc/etcd/etcd.conf
ExecStart=/usr/bin/etcd
[Install]
WantedBy=multi-user.target
3. etcd的配置
cat /etc/etcd/etcd.conf
# [member]
ETCD_NAME=default
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_CLIENT_URLS="http://localhost:2379"
ETCD_ADVERTISE_CLIENT_URLS="http://localhost:2379"
4. 给etcd创建一个工作目录：
[root@localhost etcd]# mkdir /var/lib/etcd
5. 启动etcd，并测试
[root@localhost etcd]# systemctl daemon-reload
[root@localhost etcd]# systemctl start etcd
[root@localhost etcd]# systemctl enable etcd
Created symlink from/etc/systemd/system/multi-user.target.wants/etcd.service to/usr/lib/systemd/system/etcd.service.
[root@localhost etcd]# systemctl status etcd
[root@localhost etcd]# etcdctl cluster-health
member 8e9e05c52164694d is healthy: got healthyresult from http://localhost:2379
cluster is healthy