CODEWITHSUNDEEP
amazon-web-servicesamazon-ec2amazon-iam
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Reputation: 5461

Testing application locally that uses IAM Role

I have a Java application which does adds files in S3. This application is running in a EC2 instance.

We are using IAM role. So we have attached the required IAM role to this EC2 instance.

Everything works perfect there.

But we would like to test the application locally in my laptop as well. It's hard to upload the application everytime to EC2 whenever I need to test it.

How can we switch dynamically without changing the code, so that I can test it my laptop (with accesskey and secretKey) as well as use IAM role in EC2?

Upvotes: 10

Views: 6173

Answers (3)

John Rotenstein
John Rotenstein

Reputation: 269861

The AWS SDK uses a Credentials Provider Chain to locate credentials. The order differs by language, but generally it checks:

  • Environment Variables
  • Local configuration file
  • EC2 instance metadata

Therefore, if you want to run the application locally, you can either provide a credentials file or set credentials in Environment Variables. The code will automatically locate the credentials, just like it does on an EC2 instance.

References:

Upvotes: 5

BipinMandava
BipinMandava

Reputation: 1

You can provide your own order for searching credentials by using: https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/auth/AWSCredentialsProviderChain.html

So in your case, order would be:

  1. InstanceProfileCredentialsProvider or EC2ContainerCredentialsProviderWrapper
  2. AWSStaticCredentialsProvider or EnvironmentVariableCredentialsProvider.

Add all your providers to provider chain constructor, then pass it to AWS client.

Upvotes: 0

Venkateswara Rao
Venkateswara Rao

Reputation: 5392

If you are using docker like instances , then it would be easy if you set environment variables to docker run.

docker run --env-file=FILE

OR 

docker run -it --rm -e AWS_ACCESS_KEY_ID=$AWS_ACCESS_KEY -e AWS_SECRET_ACCESS_KEY=$AWS_SECRET_KEY

Ref: https://hub.docker.com/r/pmcjury/aws-cli/

Upvotes: -1

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