开始部署之前，建议先按照Ubuntu切换到国内镜像源操作一下，能省下大把宝贵时间！

单机部署

老规矩，我们先从单机部署开始，练练手

sudo mkdir -p /data/consul/{current/{bin,etc},data}
sudo wget https://releases.hashicorp.com/consul/1.10.1/consul_1.10.1_linux_amd64.zip -O /data/consul/consul_1.10.1_linux_amd64.zip
sudo apt-get install unzip
sudo unzip /data/consul/consul_1.10.1_linux_amd64.zip -d /data/consul/current/bin
sudo vim /data/consul/current/etc/consul.json
{
    "bootstrap": true,
    "datacenter": "test-datacenter",
    "data_dir": "/data/consul/data",
    "log_level": "INFO",
    "server": true,
    "client_addr": "0.0.0.0",
    "ui": true,
    "start_join": ["ip:8301"],
    "enable_syslog": true
}
## 更多参考：https://www.consul.io/docs/agent/options.html#configuration_files

sudo ln -s /data/consul/current/etc /data/consul/etc

sudo vi /etc/systemd/system/consul.service
[Unit]
Description=consul service
[Service]
ExecStart=/data/consul/current/bin/consul agent -bind={ip} -config-dir /data/consul/etc/consul.json
User=root
[Install]
WantedBy=multi-user.target

sudo systemctl enable consul.service
sudo systemctl start consul.service

访问http://localhost:8500就可以打开Consul管理界面了，界面做的还是很不错滴！养眼

Consul集群

Consul集群是经典的server-agent架构，而且支持多server模式，真正做到了高可用。

在使用微服务的小伙伴，不妨尝试下consul作为注册中心，你会有意想不到的惊喜哦！

为了便于理解，使用1server-2agent进行演示。

主机	ip
node01	10.10.10.5
node02	10.10.10.4
node03	10.10.10.6

# 安装都是一样，分别在node01 node02 node03安装好consul
sudo mkdir -p /data/consul/{current/{bin,etc},data}
sudo wget https://releases.hashicorp.com/consul/1.10.1/consul_1.10.1_linux_amd64.zip -O /data/consul/consul_1.10.1_linux_amd64.zip
sudo apt-get install unzip
sudo unzip /data/consul/consul_1.10.1_linux_amd64.zip -d /data/consul/current/bin
sudo vi /data/consul/current/etc/consul.json
{
    "datacenter": "roc-datacenter",
    "data_dir": "/data/consul/data",
    "log_level": "INFO",
    "server": true,
    "bootstrap_expect": 3,
    "client_addr": "10.10.10.4",
    "ui": true,
    "start_join": ["10.10.10.4:8301","10.10.10.5:8301","10.10.10.6:8301"],
    "enable_syslog": true
}
## 更多参考：https://www.consul.io/docs/agent/options.html#configuration_files

sudo ln -s /data/consul/current/etc /data/consul/etc

sudo vi /etc/systemd/system/consul.service
[Unit]
Description=consul service
[Service]
ExecStart=/data/consul/current/bin/consul agent -config-dir /data/consul/etc/consul.json
User=root
[Install]
WantedBy=multi-user.target

sudo systemctl enable consul.service
sudo systemctl start consul.service

关闭防火墙，或者在内网开放端口：8300, 8301, 8500，如果网络不通，则子节点将无法join到主节点，可能会出现

failed to sync remote state: No cluster leader

无法选举出leader，其实是节点之间无法通信，如果通信正常，启动之时所有节点会自动推举出leader。

常用命令

sudo systemctl start consul.service
sudo systemctl stop consul.service
sudo systemctl restart consul.service

## 更多参考：https://www.consul.io/docs/commands/index.html

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