How does Boto3 authenticate to AWS?

Q: How does Boto3 authenticate to AWS?

> Boto3 looks for credentials in the following order: 1. Explicit parameters passed to the `boto3.client()` constructor. 2. Environment variables (`AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY`, `AWS_SESSION_TOKEN`). 3. Shared credential files (`~/.aws/credentials` and `~/.aws/config`). 4. IAM Role credentials assigned to the EC2 instance or ECS task metadata service.

💬Answer

Boto3 looks for credentials in the following order:

Explicit parameters passed to the boto3.client() constructor.
Environment variables (AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_SESSION_TOKEN).
Shared credential files (~/.aws/credentials and ~/.aws/config).
IAM Role credentials assigned to the EC2 instance or ECS task metadata service.

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