246 lines
6.1 KiB
Markdown
246 lines
6.1 KiB
Markdown
<div align="center">
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<br/>
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<a href="http://pm2.keymetrics.io/" title="PM2 Keymetrics link">
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<img width=710px src="https://raw.githubusercontent.com/Unitech/pm2/master/pres/pm2-v4.png" alt="pm2 logo">
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</a>
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<br/>
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<br/>
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<b>P</b>(rocess) <b>M</b>(anager) <b>2</b><br/>
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<i>Runtime Edition</i>
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<br/><br/>
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<a title="PM2 Downloads">
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<img src="https://img.shields.io/npm/dm/pm2" alt="Downloads per Month"/>
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</a>
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<a title="PM2 Downloads">
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<img src="https://img.shields.io/npm/dy/pm2" alt="Downloads per Year"/>
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</a>
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<a href="https://badge.fury.io/js/pm2" title="NPM Version Badge">
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<img src="https://badge.fury.io/js/pm2.svg" alt="npm version">
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</a>
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<a href="https://travis-ci.com/github/Unitech/pm2" title="PM2 Tests">
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<img src="https://travis-ci.org/Unitech/pm2.svg?branch=master" alt="Build Status"/>
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</a>
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<br/>
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<br/>
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<br/>
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</div>
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PM2 is a production process manager for Node.js applications with a built-in load balancer. It allows you to keep applications alive forever, to reload them without downtime and to facilitate common system admin tasks.
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Starting an application in production mode is as easy as:
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```bash
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$ pm2 start app.js
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```
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PM2 is constantly assailed by [more than 1800 tests](https://app.travis-ci.com/github/Unitech/pm2).
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Official website: [https://pm2.keymetrics.io/](https://pm2.keymetrics.io/)
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Works on Linux (stable) & macOS (stable) & Windows (stable). All Node.js versions are supported starting Node.js 12.X.
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### Installing PM2
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With NPM:
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```bash
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$ npm install pm2 -g
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```
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You can install Node.js easily with [NVM](https://github.com/nvm-sh/nvm#installing-and-updating) or [ASDF](https://blog.natterstefan.me/how-to-use-multiple-node-version-with-asdf).
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### Start an application
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You can start any application (Node.js, Python, Ruby, binaries in $PATH...) like that:
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```bash
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$ pm2 start app.js
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```
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Your app is now daemonized, monitored and kept alive forever.
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### Managing Applications
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Once applications are started you can manage them easily:
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To list all running applications:
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```bash
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$ pm2 list
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```
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Managing apps is straightforward:
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```bash
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$ pm2 stop <app_name|namespace|id|'all'|json_conf>
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$ pm2 restart <app_name|namespace|id|'all'|json_conf>
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$ pm2 delete <app_name|namespace|id|'all'|json_conf>
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```
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To have more details on a specific application:
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```bash
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$ pm2 describe <id|app_name>
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```
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To monitor logs, custom metrics, application information:
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```bash
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$ pm2 monit
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```
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[More about Process Management](https://pm2.keymetrics.io/docs/usage/process-management/)
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### Cluster Mode: Node.js Load Balancing & Zero Downtime Reload
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The Cluster mode is a special mode when starting a Node.js application, it starts multiple processes and load-balance HTTP/TCP/UDP queries between them. This increase overall performance (by a factor of x10 on 16 cores machines) and reliability (faster socket re-balancing in case of unhandled errors).
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Starting a Node.js application in cluster mode that will leverage all CPUs available:
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```bash
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$ pm2 start api.js -i <processes>
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```
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`<processes>` can be `'max'`, `-1` (all cpu minus 1) or a specified number of instances to start.
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**Zero Downtime Reload**
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Hot Reload allows to update an application without any downtime:
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```bash
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$ pm2 reload all
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```
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[More informations about how PM2 make clustering easy](https://pm2.keymetrics.io/docs/usage/cluster-mode/)
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### Container Support
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With the drop-in replacement command for `node`, called `pm2-runtime`, run your Node.js application in a hardened production environment.
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Using it is seamless:
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```
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RUN npm install pm2 -g
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CMD [ "pm2-runtime", "npm", "--", "start" ]
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```
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[Read More about the dedicated integration](https://pm2.keymetrics.io/docs/usage/docker-pm2-nodejs/)
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### Host monitoring speedbar
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PM2 allows to monitor your host/server vitals with a monitoring speedbar.
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To enable host monitoring:
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```bash
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$ pm2 set pm2:sysmonit true
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$ pm2 update
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```
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### Terminal Based Monitoring
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Monitor all processes launched straight from the command line:
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```bash
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$ pm2 monit
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```
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### Log Management
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To consult logs just type the command:
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```bash
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$ pm2 logs
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```
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Standard, Raw, JSON and formated output are available.
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Examples:
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```bash
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$ pm2 logs APP-NAME # Display APP-NAME logs
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$ pm2 logs --json # JSON output
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$ pm2 logs --format # Formated output
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$ pm2 flush # Flush all logs
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$ pm2 reloadLogs # Reload all logs
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```
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To enable log rotation install the following module
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```bash
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$ pm2 install pm2-logrotate
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```
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[More about log management](https://pm2.keymetrics.io/docs/usage/log-management/)
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### Startup Scripts Generation
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PM2 can generate and configure a Startup Script to keep PM2 and your processes alive at every server restart.
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Init Systems Supported: **systemd**, **upstart**, **launchd**, **rc.d**
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```bash
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# Generate Startup Script
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$ pm2 startup
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# Freeze your process list across server restart
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$ pm2 save
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# Remove Startup Script
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$ pm2 unstartup
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```
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[More about Startup Scripts Generation](https://pm2.keymetrics.io/docs/usage/startup/)
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### Updating PM2
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```bash
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# Install latest PM2 version
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$ npm install pm2@latest -g
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# Save process list, exit old PM2 & restore all processes
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$ pm2 update
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```
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*PM2 updates are seamless*
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## PM2+ Monitoring
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If you manage your apps with PM2, PM2+ makes it easy to monitor and manage apps across servers.
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Feel free to try it:
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[Discover the monitoring dashboard for PM2](https://app.pm2.io/)
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Thanks in advance and we hope that you like PM2!
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## CHANGELOG
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[CHANGELOG](https://github.com/Unitech/PM2/blob/master/CHANGELOG.md)
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## Contributors
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[Contributors](http://pm2.keymetrics.io/hall-of-fame/)
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## License
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PM2 is made available under the terms of the GNU Affero General Public License 3.0 (AGPL 3.0).
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For other licenses [contact us](mailto:contact@keymetrics.io).
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