node 工具包

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一些node项目运行的常用工具管理包

进程管理

supervisor

以往我们在开发php程序调试的时候,每修改一次,可以直接去浏览器浏览，不需要重启服务。但是在开发nodejs程序，调试的时候，无论你修改了代码的哪一部分，都需要重启服务才能生效。这是因为 Node.js 只有在第一次引用到某部份时才会去解析脚本文件，以后都会直接访问内存，避免重复载入。。Node.js的这种设计虽然有利于提高性能，却不利于开发调试，因为我们在开发过程中总是希望修改后立即看到效果，而不是每次都要终止进程并重启。supervisor 可以帮助你实现这个功能，它会监视你对代码的改动，并自动重启 Node.js

官方文档

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// 安装
# npm -g install supervisor
// 查看全局已安装的包
# npm list -g --depth 0

pm2

如果说supervisor更倾向于项目前期开发调试时使用,那么pm2则是更专业级处理产品模式的管理工具了.

pm2实现了node.js的cluster模块, 可以实现负载均衡效果, 而且号称“零宕机”

官方文档

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//安装
# npm install pm2 -g
//开启多线程
# pm2 start server.js -i 4

pm2启动

常用一些命令

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# 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 counbters
$ 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                   # Generate a startup script to respawn PM2 on boot
$ pm2 save                      # Save current process list
$ pm2 resurrect                 # Restore previously save processes
$ 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