amazon ec2 - Running shell script on already running AWS ec2 instance from java

Question

I have an ec2 instance already running in AWS cloud. My objective is to execute a shell script on this running ec2 instance from my java program.

So far I have been not able to get much code examples or documentation for same. I understand that I first need to get hold of AmazonEC2Client as:

AWSCredentials credentials = new BasicAWSCredentials(accessKey,accessSecret);
AmazonEC2Client ec2 = new AmazonEC2Client(credentials);

What should be my further approach to achieve my objective?

question from:https://stackoverflow.com/questions/65871000/running-shell-script-on-already-running-aws-ec2-instance-from-java

Answer 1

I guess your EC2 will need to expose an endpoint API for this to happen.

You might want to write another script using a high-level language (Python or Node.js are excellent examples with great Web-Api support), where this new script listens to a certain port number, and executes your underlying shell script upon request.

This would give you some flexibility in securing your endpoint if you wish, externally monitoring your script, and having any sort of statistical analysis on the request.

Another option would be to extend your original shell script to act as a server itself. Ex.

while { echo -en "Received Request"; } | nc -l "${1:-8080}"; do

However this is less flexible with more room for security vulnerabilities.