安装 curl

sudo apt install curl

安装 consul

1. 官网下载安装包https://www.consul.io/downloads.html
2. 安装

#解压
unzip consul**.zip
#得到一个文件consul。 
cp consul /usr/local/bin/
#验证
consul

3. 启动服务http://localhost:8500/ui/

consul agent -dev -client=0.0.0.0
# -client  // 对外提供服务改成0.0.0.0

服务注册（dns）

1. 先退出consul服务
2. 定义服务

#创建配置文件夹
mkdir /etc/consul.d
#定义服务
sudo echo '{"service": {"name": "web", "tags": ["rails"], "port": 80}}'  | sudo tee /etc/consul.d/web.json
#重启consul服务，指定config-dir
consul agent -dev -ui -config-dir /etc/consul.d

3. 验证http://localhost:8500/ui/

服务注册（http api）

1. 安装依赖

npm init -y
npm install --save-dev request koa koa-router

2. index.js

const request = require('request');
const { networkInterfaces } = require('os');

const getIPAdress = () => {
    let interfaces = networkInterfaces();
    for (let devName in interfaces) {
        let iface = interfaces[devName];
        for (let i = 0; i < iface.length; i++) {
            let alias = iface[i];
            if (
                alias.family === "IPv4" &&
                alias.address !== "127.0.0.1" &&
                !alias.internal
            ) {
                return alias.address;
            }
        }
    }
};

const IP = getIPAdress();

let options = {
    url: `http://127.0.0.1:8500/v1/agent/service/register`,
    headers: {
        "content-type": "application/json"
    },
    body: JSON.stringify({
        ID: 'cuic' + "_" + new Date().getTime(),
        Name: 'cuic',
        Address: IP,
        Port: 3000,
        Tags: ["activity", "nodejs"],
        Check: {
            HTTP: `http://${IP}:3000/healthCheck`,
            Interval: "10s"
        }
    })
};

request.put(options, (error, response, body) => {
    if (error) {
        console.log("reg sendRequest error: ", error);
        return;
    }
});

3. service.js

const Koa = require('koa');
const Router = require('koa-router');

const app = new Koa();
const router = new Router();

router.get('/healthCheck', (ctx, next) => {
    ctx.response.status = 200;
});

app.use(router.routes());

app.listen(3000);
console.log(`listen port : 3000`);

4. 运行命令

node index.js
node service.js

安装 consul-template

1. 官网下载安装包https://releases.hashicorp.com/consul-template/0.19.5/
2. 安装

#解压
unzip consul**.zip
#得到一个文件consul-template。 
cp consul-template /usr/local/bin/

tpl文件

find_address.tpl

{{ key "/hashicorp/street_address" }}

编译（-once代表只编译一次）

consul-template -template "find_address.tpl:hashicorp_address.txt" -once

修改命令

consul kv put hashicorp/street_address "101 2nd St"

consul-template配置nginx.config

consul-template -consul-addr 127.0.0.1:8500 -template "./tmpltest.ctmpl:./result"