Q: How do you securely share an S3 object with an external partner who doesn't have an AWS account?
Use S3 Pre-Signed URLs:
#AWS #S3 & Storage #L2 #Cloud #Infrastructure #S3
🎙️ Candidate Opening & Architectural Context
""In a previous role, our monitoring paged me for a similar incident across our AWS VPC infrastructure. When addressing this question, I walk the interviewer through our production incident runbook: isolating the blast radius, checking diagnostic logs and metrics, and applying a safe fix.""
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🛠️ Production Runbook & Step-by-Step Resolution
1️⃣
Production Solution & Architecture
Use S3 Pre-Signed URLs: This generates a time-limited URL. Anyone with the URL can download the file without AWS credentials. After expiry, the URL stops working. For uploads: aws s3 presign --method PUT generates a pre-signed URL for uploading. For long-term sharing: use S3 Access Points with a bucket policy, or give the partner a limited IAM user. Never make the bucket public — use pre-signed URLs for controlled sharing.
aws s3 presign s3://my-bucket/my-file.pdf --expires-in 3600
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: Use S3 Pre-Signed URLs:."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: Use S3 Pre-Signed URLs:
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
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