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NodeJS and Python

The PM2 page allows you to run Python or NodeJS applications from within the OpenPanel interface.

Create an Application

To create a new application click on the 'New Application' button.

In the form set:

Application URL - domain on which the application will be visible
Application startup file - this is the file that PM2 will start
Type - NodeJS or Python Application
Port - port on which the application will run and Nginx will proxy the Application URL to
Watch - wheather to auto restart the application if fails
Enable Logs - wheather to collect logs for the application or not

And click on the 'Create' button.

Python Applications

For python applications you need to set the Type to Python so that PM2 uses the --interpreter flag.

Example python application

from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello():
    return "Hello world!"

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000)

NodeJS Application

NPM Install

Navigate to your project directory: Open Web Terminal or connect via SSH to the server and navigate to the directory where your project is located. You can use the cd command to change directories.
```
cd path/to/your/project
```
Check for package.json file: Make sure that your project has a package.json file. This file contains metadata about your project and the list of dependencies. If you don't have one, you can create it by running:
```
npm init
```

Follow the prompts to set up your package.json file.

Install dependencies: Run the following command to install the dependencies listed in your package.json file:
```
npm install
```

Example NodeJS application

const http = require('http');

const server = http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.end('Hello, World!\n');
});

const port = process.env.PORT || 3000;

server.listen(port, () => {
  console.log(`Server is running on port ${port}`);
});

View Applications

The PM2 page displays a list of all current NodeJS and Python applications.

Application name - domain on which the application is visible
Uptime - time passed since the application was started or created
Restarts - number of times the PM2 restarted the script (only if watch was enabled for the application)
CPU - current CPU % usage for the application process
Memory - current RAM usage in bytes by the applciaiton process
Watching - wheather the application was created with the watch option or not
Actions - Start/Stop, Restart and Delete the application
Type - NodeJS or Python application
Port - port on which the application is running and Nginx is proxying requests to
Startup file - main entrypoint for the application

Manage Application

Currently only the following actions can be performed for existing applications in the PM2 page:

Restart

To restart an application *(force stop and start it immediately) click on the 'Restart' button:

This will immediately stop the pm2 process for the applicaiton and start again the startup script.

Stop

To stop the application simply click on the 'Stop' button. This will immediately stop the process but leave the Nginx proxy to the port.

Delete

To completely remove an appliaiton click on the 'Delete' button. This will immediately stop the process and delete the Nginx proxy to the port.

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