etcd集群部署

etcd github 3.5.0 版本
https://github.com/etcd-io/etcd/releases/tag/v3.5.0

```
wget https://github.com/etcd-io/etcd/releases/download/v3.5.0/etcd-v3.5.0-linux-amd64.tar.gz
```
## 集群配置文件 
/etc/目录下建立etcd.conf
```
name: 'etcd2'  #每个节点名称不一样
data-dir: '/data'
wal-log: '/wal'
snapshot-count: 10000
heartbeat-interval: 100
election-timeout: 1000
listen-peer-urls: 'http://192.168.198.101:2380'  #本机ip
listen-client-urls: 'http://192.168.198.101:2379' #本机ip
max-snapshots: 5
max-wals: 5
cors:
initial-advertise-peer-urls: 'http://192.168.198.101:2380'  #本机ip
advertise-client-urls: 'http://192.168.198.101:2379'    #本机ip
initial-cluster: 'etcd1=http://192.168.198.100:2380,etcd2=http://192.168.198.101:2380,etcd3=http://192.168.198.102:2380'
initial-cluster-token: 'etcd'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
debug: false
logger: zap
log-outputs: [stderr]

# 启用身份验证
auth: simple

# 用户名和密码
user: your_username
password: your_password
```

## 启动方式
### 命令
```
etcd --config-file /etc/etcd.conf > /wal/etcd1.log 2>&1 &
```
### service

```
cat << EOF > /lib/systemd/system/etcd.service
[Unit]
Description=etcd service
Documentation=https://github.com/coreos/etcd
[Service]
User=root
Type=notify
ExecStart=/usr/local/etcd \\
 --name etcd-3 \\
 --data-dir /data \\
 --initial-advertise-peer-urls http://192.168.198.102:2380 \\
 --listen-peer-urls http://192.168.198.102:2380 \\
 --listen-client-urls http://192.168.198.102:2379,http://127.0.0.1:2379 \\
 --advertise-client-urls http://192.168.198.102:2379 \\
 --initial-cluster-token etcd-cluster \\
 --initial-cluster etcd-1=http://192.168.198.100:2380,etcd-2=http://192.168.198.101:2380,etcd-3=http://192.168.198.102:2380 \\
 --initial-cluster-state new \\
 --heartbeat-interval 1000 \\
 --election-timeout 5000
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
```

```
sudo systemctl daemon-reload
sudo systemctl enable etcd
sudo systemctl start etcd
```

```
cat << EOF > /lib/systemd/system/etcd.service
[Unit]
Description=etcd service
Documentation=https://github.com/coreos/etcd
[Service]
User=root
Type=notify
ExecStart=/root/etcd/etcd --config-file /etc/etcd.conf
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
```