pm2一个带有负载均衡功能的Node应用的进程管理器

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pm2一个带有负载均衡功能的Node应用的进程管理器

PM2是一个提供了内置的负载均衡的Node.js应用程序进程管理器。它可以让你保持应用程序永远在线，无需停机地重启应用，也有助于系统管理员工作。

安装 PM2

$ npm install pm2 -g

启动应用

$ pm2 start app.js

这样，应用就已经在后台启动，并被监测保持在线。

模块系统

PM2 内嵌一个简单强大的模块系统，可以直接像下面这样安装模块

$ pm2 install <module_name>

更新PM2

# Install latest pm2 version
$ npm install pm2 -g
# Save process list, exit old PM2 & restore all processes
$ pm2 update

主要特性

命令概览

$ npm install pm2 -g            # Install PM2
$ pm2 start app.js              # Start, Daemonize and auto restart application
$ pm2 start app.js -i 4         # Start 4 instances of application in cluster mode
                                # it will load balance network queries to each app
$ pm2 start app.js --name="api" # Start application and name it "api"
$ pm2 start app.js --watch      # Restart application on file change
$ pm2 start script.sh           # Start bash script

$ 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

$ pm2 logs                      # Display logs of all apps
$ pm2 logs [app-name]           # Display logs for a specific app
$ pm2 flush

$ pm2 stop all                  # Stop all apps
$ pm2 stop 0                    # Stop process with id 0
$ pm2 restart all               # Restart all apps
$ pm2 reload all                # Reload all apps in cluster mode
$ 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
$ pm2 scale api 10              # Scale app with name api to 10 instances
$ pm2 reset [app-name]          # Reset number of restart for [app-name]

$ 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

$ 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

$ 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

开启进程的多种方式

$ pm2 start app.js --watch      # Restart application on file change
$ pm2 start script.sh           # Start bash script
$ pm2 start app.js -- -a 34     # Start app and pass option -a 34
$ pm2 start app.json            # Start all applications declared in app.json
$ pm2 start my-python-script.py --interpreter python

进程管理

列出所有进程：

$ pm2 list

管理进程

$ pm2 stop     <app_name|id|'all'|json_conf>
$ pm2 restart  <app_name|id|'all'|json_conf>
$ pm2 delete   <app_name|id|'all'|json_conf>

查看进程的详情

$ pm2 describe <id|app_name>

CPU / 内存监测

$ pm2 monit

日志工具

pm2 logs ['all'|'PM2'|app_name|app_id] [--err|--out] [--lines <n>] [--raw] [--timestamp [format]]

例：

$ pm2 logs
$ pm2 logs WEB-API --err
$ pm2 logs all --raw
$ pm2 logs --lines 5
$ pm2 logs --timestamp "HH:mm:ss"
$ pm2 logs WEB-API --lines 0 --timestamp "HH:mm" --out
$ pm2 logs PM2 --timestamp

$ pm2 flush          // Clear all the logs

开机启动

PM2可以自动生成并配置开机启动脚本，让服务器在重启的时候可以保持应用在线

$ pm2 startup
# auto-detect platform
$ pm2 startup [platform]
# render startup-script for a specific platform, the [platform] could be one of:
#   ubuntu|centos|redhat|gentoo|systemd|darwin|amazon

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