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.
PM2 also offers a simple and easy-to-use monitoring feature, which makes it easy to get information about your applications' health.
PM2 is constantly being updated and now supports over 30 different languages, making it a truly multi-language platform.
Some of the features that make PM2 stand out are:
- Application Pre-loading
PM2 can pre-load applications, which means that your applications are started before they are actually needed. This is especially useful for web applications, where you can start the application server before the first user request arrives.
This way, the user doesn't have to wait for the application to start, and the application can immediately start serving requests.
- Auto-scaling
PM2 can automatically scale applications based on the load. This is especially useful for web applications, where the number of requests can vary greatly over time.
With auto-scaling, PM2 can automatically add or remove application instances based on the load, so that the application always has the capacity to serve all incoming requests.
- Load-balancing
PM2 comes with a built-in load balancer, which can distribute requests to different application instances. This is especially useful for web applications, where you can have multiple application servers running behind the load balancer.
The load balancer will automatically distribute requests to the different application servers, so that each server only has to handle a fraction of the total load.
- Monitoring
PM2 comes with a simple and easy-to-use monitoring feature, which makes it easy to get information about your applications' health.
The monitoring feature shows information about the CPU and memory usage of each application, as well as the number of requests that each application is handling.
This information can be used to identify performance bottlenecks and optimize the applications.
- Multi-language support
PM2 supports over 30 different languages, making it a truly multi-language platform.
This means that you can use PM2 to manage applications written in any language, not just Node.js.
- Clustering
PM2 comes with built-in support for clustering, which allows you to run multiple application instances on a single server.
Clustering is especially useful for web applications, where you can have multiple application servers running behind the load balancer.
With clustering, each application server can handle its own part of the load, which can improve the performance of the overall system.
Graceful shutdown
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