Where does elastic beanstalk t2 server store my node.js app files?

Question

From an architecture perspective I'm trying to get a better understand of how and where files deployed to eb (t2) server are stored.

I see some .zip files in s3 that show when I upload something via the eb interface, though how/where exactly does this get end up on my ec2(t2) server?

Answer 1

It's in the /tmp/deployment/application folder during deployment and the moved to /var/app/current afterward.

In case you search them, the node logs are in /var/log/nodejs/nodejs.log and the application will bind to 8081 no matter what PORT environment variable you set in the Environment Variables in the console.

Answer 2

最佳答案似乎在 2020 年 11 月仍然适用于节点应用程序（在我的情况下为 nuxt 应用程序）

/var/app/current

Answer 3

/var/app/current may be outdated. It doesn't exist on my instance.
As said there I can't find my Web app when I SSH to my AWS Elastic Beanstalk instance , for python the app is in /opt/python/bundle/2/app/
Otherwise use find to search for the location (look at the link).

Answer 4

As a more general answer (not node.js-specific), check eb-engine.log from your Elastic Beanstalk environment.

Where are the logs? In Elastic Beanstalk's online interface in the sidebar of your environment.

...
2021/06/12 22:40:34.097454 [INFO] app source bundle is zip file ...
2021/06/12 22:40:34.097460 [INFO] extracting /opt/elasticbeanstalk/deployment/app_source_bundle to /var/app/staging/
2021/06/12 22:40:34.097470 [INFO] Running command /bin/sh -c /usr/bin/unzip -q -o /opt/elasticbeanstalk/deployment/app_source_bundle -d /var/app/staging/
2021/06/12 22:40:34.138333 [INFO] finished extracting /opt/elasticbeanstalk/deployment/app_source_bundle to /var/app/staging/ successfully
...

Interpretation:

1. app_source_bundle was uploaded to /opt/elasticbeanstalk/deployment/ initially
2. app_source_bundle was extracted to /var/app/staging/

If Elastic Beanstalk deployment is successful, you can find the running app's code in /var/app/current (as Manuel pointed out).