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8 pages in this section.
How both AWS SDKs search for credentials across environment variables, shared config and credentials files, SSO, assumed roles, and container and instance metadata services.
Set explicit region, retries, timeouts, and credential sources over SDK defaults before shipping to production, with side-by-side boto3 and AWS SDK v3 examples.
Why IMDSv2 is the required, session-token-based metadata service and how boto3 and AWS SDK v3 consume EC2 instance-profile credentials from it automatically.
Write a custom credential provider for Vault or Secrets Manager-backed and other short-lived credentials, with auto-refresh in boto3 (RefreshableCredentials) and AWS SDK v3.
A pre-launch checklist for AWS SDK auth and configuration hygiene: roles over keys, IMDSv2, explicit region and retries, least privilege, and observable identity - for boto3 and SDK v3.