问题：当SSH远程连接到服务器上，然后运行 node server.js 我们在浏览器打开localhost:3000,网站正常访问。但是，关闭SSH，我们的网站打不开了。
解决方法：使用nohup命令让程序在关闭窗口（切换SSH连接）的时候程序还能继续在后台运行。
用node不推荐
推荐方法
用node pm2模块
pm2官方文档：http://pm2.keymetrics.io/docs/usage/quick-start/
github pm2文档： https://github.com/Unitech/pm2
安装pm2 (建议全局安装)
$ npm install pm2 -g
开始你的服务
$ pm2 start server.js
更新pm2
$ pm2 update
所以命令
# General
$ npm install pm2 -g # Install PM2
$ pm2 start app.js # Start, Daemonize and auto-restart application (Node)
$ pm2 start app.py # Start, Daemonize and auto-restart application (Python)
$ pm2 start npm -- start # Start, Daemonize and auto-restart Node application
# Cluster Mode (Node.js only)
$ pm2 start app.js -i 4 # Start 4 instances of application in cluster mode
# it will load balance network queries to each app
$ pm2 reload all # Zero Second Downtime Reload
$ pm2 scale [app-name] 10 # Scale Cluster app to 10 process
# Process Monitoring
$ pm2 list # List all processes started with PM2
$ pm2 monit # Display memory and cpu usage of each app
$ pm2 show [app-name] # Show all informations about application
# Log management
$ pm2 logs # Display logs of all apps
$ pm2 logs [app-name] # Display logs for a specific app
$ pm2 logs --json # Logs in JSON format
$ pm2 flush
$ pm2 reloadLogs
# Process State Management
$ pm2 start app.js --name="api" # Start application and name it "api"
$ pm2 start app.js -- -a 34 # Start app and pass option "-a 34" as argument
$ pm2 start app.js --watch # Restart application on file change
$ pm2 start script.sh # Start bash script
$ pm2 start app.json # Start all applications declared in app.json
$ pm2 reset [app-name] # Reset all counters
$ pm2 stop all # Stop all apps
$ pm2 stop 0 # Stop process with id 0
$ pm2 restart all # Restart all apps
$ pm2 gracefulReload all # Graceful reload all apps in cluster mode
$ pm2 delete all # Kill and delete all apps
$ pm2 delete 0 # Delete app with id 0
# Startup/Boot management
$ pm2 startup # Detect init system, generate and configure pm2 boot on startup
$ pm2 save # Save current process list
$ pm2 resurrect # Restore previously save processes
$ pm2 unstartup # Disable and remove startup system
$ pm2 update # Save processes, kill PM2 and restore processes
$ pm2 generate # Generate a sample json configuration file
# Deployment
$ pm2 deploy app.json prod setup # Setup "prod" remote server
$ pm2 deploy app.json prod # Update "prod" remote server
$ pm2 deploy app.json prod revert 2 # Revert "prod" remote server by 2
# Module system
$ pm2 module:generate [name] # Generate sample module with name [name]
$ pm2 install pm2-logrotate # Install module (here a log rotation system)
$ pm2 uninstall pm2-logrotate # Uninstall module
$ pm2 publish # Increment version, git push and npm publish
pm2 ls
感觉功能太强大了，更多知识 查看github
有时候我们可能不直接运行js 脚本 而是 运行 npm -- start ，下面是解决方案
{
"name": "my_app",
"scripts": [
"start": "node main.js"
]
}
//直接运行下面代码就可以调用 package.json 里面的scripts 里面的start 命令
$ pm2 start npm -- start
在此做一下记录，如有问题可以留言。
