Detailed explanation of the configuration steps for configuring node server and linking WeChat official account interface

curl -o- /nvm-sh/nvm/v0.34.0/ | bash
or
wget -qO- /nvm-sh/nvm/v0.34.0/ | bash

// Check the currently installed node versionnvm ls-remote
// Select the ''Official website LTS stable versionnvm install v10.16.0
// This display appears to indicate that the installation is complete. The default is the node version of v10.16.0 and the npm version of 6.9.0Now using node v10.16.0 (npm v6.9.0)
Creating default alias: default -> v10.16.0
// You can use the command to view the versionnode --version 
// nvm can install multiple node versionsnvm install v10.11.0
// You can use the command to view how many node versions are installednvm ls
// You can use the command to specify the default node version. If multiple node versions are installed, you must specify a default version.nvm alias default v10.11.0
// If you don't want to use the default, just use it at zero, you can use the commandnvm use v10.11.0

// Check the server system version$ cat /etc/redhat-release 
// Install the epel-release sourceyum install epel-release -y
// Open source configurationvim /etc//
// Set up nginx installation source in configuration. For details, please refer to nginx official website documentation ('/en/linux_packages.html#stable')[nginx]
name=nginx repo
baseurl=/packages/centos/7/$basearch/
gpgcheck=0
enabled=1
// Install nginxyum install nginx -y
// Check whether nginx is installed successfully. If successful, the path will be displayed.whereis nginx

// Set up startupsystemctl enable nginx
// Start the service, restart is 'systemctl restart nginx', stop is 'stop'systemctl start nginx
// Reload, because after reconfiguration, you do not want to restart the service. You can use reload at this timesystemctl reload nginx
// Check the server statussystemctl status nginx
// If the CentOS7 system has a firewall turned on, you also need to open the firewall port.firewall-cmd --zone=public --permanent --add-service=http
sudo firewall-cmd --reload
firewall-cmd --list-service
// If you want to use a reverse proxy, CentOS7 needs to turn on network accesssetsebool httpd_can_network_connect 1

// Create foldermkdir server
// Enter the foldercd server
// Create a js filevim 
// Write the test code, note that the IP address here must be configured to 0.0.0.0.0. If it is configured to 127.0.0.1, the external network will report an error port 3000 link that does not work.const http = require('http');
const hostname = '0.0.0.0';
const port = 3000;
const server = ((req, res) => {
 = 200;
('Content-Type', 'text/plain');
('Hello World\n');
});
(port, hostname, () => {
(`The server runs on http://${hostname}:${port}/`);
});
// start upnode 
// If an error 'Unhandled 'error' event' is reported, it may be that the port has been occupied. First check the port occupancy situationps -ef|grep node
// If there is an occupation, delete the occupation, 'xxxx' is the number after 'root'skill -9 xxxxx

// Enter the '/etc/nginx' folder and view the '' configuration filecd /etc/nginx
ls
vim 
// The lower version of nginx '' folder contains the following content// # include /etc/nginx//*.conf;
// # include /etc/nginx/sites-enabled/*;
// Remove '#' Number// Create nginx configuration file, the file name is free, I usually like to use the project name and port number, such as 'wxServer-3000'vim /etc/nginx//
// Write configuration file code# Project nameupstream wxServer {
# The node port number that needs the proxy, which is the port number you wroteserver 0.0.0.0:3000;
# nginx maximum number of connectionskeepalive 8;
}
# nginx server instanceserver {
# The port number that is proxyed, default port 80 of the Http protocol. If you configure other ports, you need to change the settings of SELinuxlisten 0.0.0.0:80;
# The domain name or IP address visited by others, separated by spacesserver_name  ;
# Error log storage addressaccess_log /var/log/nginx/;
location / {
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header X-NginX-Proxy true;
# proxy_pass Set the server domain name of the reverse proxy. Do not use the reverse proxy, just use the name of the upstream above.proxy_pass http://wxServer/;
proxy_redirect off;
}
}
// After saving the configuration file, check whether it is written errorsnginx -t
// The following content appears is correctnginx: the configuration file /etc/nginx/ syntax is ok
nginx: configuration file /etc/nginx/ test is successful
// Reload nginx serversystemctl reload nginx
// Open in Alibaba Cloud background80Security group for ports，Then enter the domain name in the browser，Can see 'Hello World' That meansnginxThe configuration was successful

// Install PM2npm install pm2 -g
// Enter the folder stored in your node project, pwd is your folder pathcd pwd
// Start pm2, --watch listening, each code changes automatically start, -i 1 Start an instance, according to several core settings of the server// -i 0 will automatically start as many processes as possible based on the current number of cores of the machinepm2 start  --watch -i 1
// View pm2pm2 ls
// View error logpm2 logs
// Restartpm2 restart 
// Stop, id is obtained by viewingpm2 stop home|id
// deletepm2 delete home|id
// Learn more about the programpm2 describe home|id
// closureXshell，Refresh the domain name，You can also see 'Hello World' Indicates that the configuration is successful

const Koa = require('koa')
const cors = require('koa2-cors')
const Router = require('koa-router')
const crypto = require('crypto')
const app = new Koa()
// WeChat configurationconst config = {
wechat: {
appID: 'appID',
appsecret: 'appsecret',
token: 'Maya'
}
}
// Use koa2-cors to solve cross-domain problems(
cors({
origin: ctx => {
if ( === '/test') {
return false
}
return '*'
},
exposeHeaders: ['WWW-Authenticate', 'Server-Authorization'],
maxAge: 5,
credentials: true,
allowMethods: ['GET', 'POST', 'DELETE'],
allowHeaders: ['Content-Type', 'Authorization', 'Accept']
})
)
// Verified to WeChatconst wxServer = new Router()
('/', async ctx => {
const { signature, timestamp, nonce, echostr } = 
const token = 
let hash = ('sha1')
const arr = [token, timestamp, nonce].sort()
((''))
const shasum = ('hex')
if (shasum === signature) {
return ( = echostr)
}
 = 401
 = 'Invalid signature'
})
// Load all routesconst router = new Router()
('/forWx', (), ())
// Load routing middleware(()).use(())
(3000)
('[demo] start-quick is starting at port 3000')

// Installnpm install -g localtunnel
// Turn on the local serverlt --port 3000

node 

// Installyum install lrzsz -y
// Upload, execute commands, and select package filerz
// Download, filename is the server folder you packaged, or a single filesz filename