Shutting down several ports with an Express application

Currently, my app is running on multiple server instances on different ports. I achieve this by using the command "npm run node_1 & npm run node_2", which runs the app on localhost at ports 3001 and 3002. The issue arises when I attempt to close the application using CTRL+C, as it only closes the first port while leaving the other one active. This results in an error message indicating that the second port is still in use, as shown below.

[nodemon] starting 

node ./networkNode.js 3002 http://localhost:3002
events.js:173 throw er; // Unhandled 'error' event ^

Error: listen EADDRINUSE: address already in use :::3002

My package.json :

"scripts": {
    "node_1": "nodemon --watch . -e js ./networkNode.js 3001 
           http://localhost:3001",
    "node_2": "nodemon --watch . -e js ./networkNode.js 3002 
           http://localhost:3002",
  },
node.jsexpress

Answer №1

If you place an ampersand (&) after a command, it will run as a background job. There are various commands that can help manage these jobs, which can be found here.

An easier solution might be to use the NPM package called concurrently to start these processes instead. When you stop concurrently using Ctrl+C, it will also end all the jobs it initiated.

Answer №2

When attempting to execute multiple processes using the "&" symbol in the command line, it typically results in only one process being attached to the terminal. In such cases, pressing "ctrl+c" will only trigger the SIGINT signal event for the attached process. For better management of multiple processes, it is recommended to use a process manager like pm2. Alternatively, you can opt for a lighter solution by utilizing the run-all package.

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