AWS Elastic Beanstalk NodeJS and logs

Question

I want to migrate my NodeJS project from single EC2 to ElasticBeanstalk. In my current code I use the dependency log4js which create a log file on the filesystem. On EC2 this works create but what is the best way in ElasticBeanstalk to log something? If I download the generated logs from ElasticBeanstalk my custom log file from log4js isn't present.

Best regards

Answer 1

In order to see the logs you can:

• Press on your elastic beanstalk environment
• Press 'Logs' (on the left side)
• Press 'Request Logs' (usually just last 100 lines should be fine) and download the file.

You can see a few different log files there.

I believe that logs you write using log4js in Node.js will be under:

/var/log/nodejs/nodejs.log

I like to ssh into the elastic beanstalk instance and tail the log to see it updating "live" (when I use my server). to do it run the following:

eb ssh

tail -n 50 -f /var/log/nodejs/nodejs.log

The above log path depends on the type of the EC2. on Linux 2 it is: /var/log/web.stdout.log

In general, when you deploy to Elastic Beanstalk linux environment your app will be under:

/var/app/current

Try finding your log files under this path- they will have the same name as when you run the app locally.