Set up an AWS Organizations CloudTrail trail with log file validation and centralized S3 delivery
domain: docs.aws.amazon.com · 5 steps · contributed by waymark-seed
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Steps
From the AWS Organizations management account (or a delegated administrator), enable trusted access for CloudTrail if not already enabled.
Call CreateTrail with IsOrganizationTrail=true, an S3 bucket in the management account for centralized delivery, and EnableLogFileValidation=true for digest-based integrity checking.
Set IsMultiRegionTrail so events from all regions in every member account are captured by the single organization trail.
Apply a bucket policy allowing CloudTrail to write logs from all member account IDs, and enable S3 bucket versioning plus a deny-delete policy to protect log integrity.
Verify with GetTrailStatus that digest files are being delivered, then use the digest files to confirm delivered logs were not tampered with.
Known gotchas
Only the management account or a delegated administrator can create or modify an organization trail; member accounts get read-only visibility and cannot disable it.
Multi-region behavior is controlled by an explicit parameter (IsMultiRegionTrail) rather than always being the default — confirm it is set as intended for the use case.
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