How to place files outside app deployment directory in AWS Elastic Beanstalk? - amazon-elastic-beanstalk

Question

In AWS EB, how to place my environment.properties (contains app runtime config like port, logs dir, DB info, security keys, etc.) under /var/env_config/myapp, so it can be referred by the app at runtime?
Though my further plan is to put this environment.properties in a secure non app directory of local or remote file system as it contains sensitive information.
global.env = propsReader(path.join(process.env.ENV_PATH, 'env-main.properties'));
On the EB, I have added an Environment property 'ENV_PATH = /var/env_config/myapp'
EB logs:
web: > myapp#1.0.0 start /var/app/current
web: > node src/app-main.js
web: 8266 [
web: '/opt/elasticbeanstalk/node-install/node-v12.18.1-linux-x64/bin/node',
web: '/var/app/current/src/app-main.js'
web: ]
web: /var/env_config/myapp
web: internal/fs/utils.js:230
web: throw err;
web: ^
web: Error: ENOENT: no such file or directory, open '/var/env_config/myapp/env-main.properties'
I just wanna deploy my application in the same fashion in AWS EB or Docker or VM or local machine, with just an environment property saying where the required runtime input files are.

Answer 1

How to access Elastic Beanstalk file system to configure my .properties file?
Not sure what do you mean by "accessing file system", but usually you would create .ebextensions folder in your project directory. The extensions are commonly used for running commands or scripts when you are deploying your app. There are special sections for that:
commands: You can use the commands key to execute commands on the EC2 instance. The commands run before the application and web server are set up and the application version file is extracted.
container_commands: You can use the container_commands key to execute commands that affect your application source code. Container commands run after the application and web server have been set up and the application version archive has been extracted, but before the application version is deployed.
Therefore, you could use the above sections to modify your .properties file during deployment of your application into EB.