什么是PM2

本文作者: jsweibo

本文链接: https://jsweibo.github.io/2019/10/02/%E4%BB%80%E4%B9%88%E6%98%AFPM2/

摘要

本文主要讲述了：

什么是 PM2
安装
示例

正文

什么是 PM2

PM2 是一个开源的 nodejs 进程管理器。

安装

全局安装

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#!/usr/bin/env bash

npm install -g pm2

示例

learn_pm2/ecosystem.config.js

module.exports = {
  apps: [
    {
      name: 'learn_pm2',
      script: 'index.js',
    },
  ],
};

learn_pm2/index.js

const http = require('http');
const path = require('path');
const fs = require('fs');
const mime = require('mime');

const server = http.createServer();
const baseURL = 'html';

function get(req, res) {
  const url = new URL(req.url, 'http://localhost');
  const pathname = decodeURIComponent(url.pathname);
  const filepath = path.join(__dirname, baseURL, pathname);
  fs.stat(filepath, function (er, stat) {
    if (er) {
      if (er.code === 'ENOENT') {
        res.statusCode = 404;
        res.end('Not Found');
      } else {
        res.statusCode = 500;
        res.end('Internal Server Error');
      }
    } else {
      res.setHeader('Content-Type', mime.getType(filepath));
      res.setHeader('Content-Length', stat.size);
      const stream = fs.createReadStream(filepath);
      stream.on('error', function () {
        res.statusCode = 500;
        res.end('Internal Server Error');
      });
      stream.pipe(res);
    }
  });
}

server.on('request', function (req, res) {
  switch (req.method) {
    case 'GET':
      get(req, res);
      break;
    case 'POST':
      break;
    default:
      break;
  }
});

const hostname = process.argv[2] || '127.0.0.1';
const port = process.argv[3] || 3000;

server.listen({
  hostname,
  port,
});

console.log(`Server is running at http://${hostname}:${port}`);