custom logging under pm2

Question

I have some useful logging in my node app that I write to console.log

node server.js >> /var/log/nodeserver.log 2>&1

However, when trying the same under pm2:

pm2 start server.js >> /var/log/pm2server.log 2>&1

the log file only shows the pm2 startup information

Is application logging at all possible with pm2? On their page they discuss logging, and show an image with text like "log message from echo.js", but I see nothing about getting custom information into the pm2 log.

Answer 1

Update in 2017.

Define log path as parameter when pm2 command is executed (-l, -o, -e) is very easy to use and normally is the best choice.

However, if you don't want to define log path every time when pm2 is executed, you can generate a configuration file, define error_file and out_file, and start pm2 from that:

1. Generate a configuration file: pm2 ecosystem simple. This would generate a file ecosystem.config.js, with following content:

   module.exports = {
     apps : [{
       name   : "app1",
       script : "./app.js"
     }]
   }
   

2. Define error_file (for error log) and out_file (for info log) in the file, such as:

   module.exports = {
     apps : [{
       name   : "app1",
       script : "./app.js",
       error_file : "./err.log",
       out_file : "./out.log"
     }]
   }
   

3. Start the process from the configuration file:

   pm2 start ecosystem.config.js
   

In this way, the logs are saved to ./err.log and ./out.log.

Please refer to the document for detail information.