how to use debug with PM2? #503

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1. DanielHeckrath commented on Sep 27, 2017

   

   DanielHeckrath

   on Sep 27, 2017

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   Isn't it possible to use the ecosystem.config.js to configure different environment variables when starting a process with PM2?
   See https://github.com/Unitech/pm2/wiki/Applications-Declaration

   Should be possible to include DEBUG=* in the env section of your desired process
2. bi-kai commented on Sep 28, 2017

   

   bi-kai

   on Sep 28, 2017

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   That works, and there is another question, the debug logs are all in PM2's error log, not in out.log, do you know why?
3. DanielHeckrath commented on Sep 28, 2017

   

   DanielHeckrath

   on Sep 28, 2017

   Last edited by DanielHeckrath

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   When you use debug on nodejs it writes to stderr by default (see node.js)

   It is possible though to redirect the output of a logger to another stream https://github.com/visionmedia/debug/blob/master/examples/node/stdout.js

   The pattern I'm usually using when working with debug is this:

   const logFactory = require('debug');
   
   module.exports = function log(namespace) {
       const debug = logFactory(namespace);
   
       const error = logFactory(namespace);
       error.log = function(...args) {
           console.error(...args);
       };
   
       return {
           debug,
           error,
       };
   };
   

   then I just require my new log factory in my modules like this

   const log = require('log')('tag');
   
   log.debug('this logs to stdout');
   log.error('this logs to stderr');
   

   Note that you have to rewrite the error.log part to something like this if ES6 spread syntax is not available in your environment

   error.log = console.error.bind(console);
   

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4. bi-kai commented on Oct 28, 2017

   

   bi-kai

   on Oct 28, 2017

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   That's greet!
5. bi-kai

   closed this as completedon Oct 28, 2017