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What actually caused the Amazon outage from a technical perspective

Amazon's internal DNS server at East Coast 1 stopped working...
Bright Puppy New Version
  10/21/25
All it did is remind everyone how large Amazon’s marke...
splenetic crimson athletic conference hissy fit
  10/21/25
Yeah it was a window into how many companies are using EC2. ...
Bright Puppy New Version
  10/21/25
Israel was upgrading their backdoors
Hot hairraiser sanctuary idiot
  10/21/25
Israel barely knows how to make a Zoom call these days. They...
Bright Puppy New Version
  10/21/25
Engineering, champ.
pearly house gaping
  10/21/25


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Date: October 21st, 2025 5:50 PM
Author: Bright Puppy New Version

Amazon's internal DNS server at East Coast 1 stopped working intermittently for west coast customers around 12-2am PST. Amazon uses some shit called DynamoDB to handle all the DNS calls. If there's even a brief outage, it causes a backlog of requests to the DynamoDB while the system gets rebooted. In this case they got the shit rebooted fast as fuck, but the intermittent outages created a sufficient backlog of requests that it took several hours for DynamoDB to fully populate its cache and respond to all the requests. That's the best I can explain it.

(http://www.autoadmit.com/thread.php?thread_id=5788430&forum_id=2\u0026hid=",#49364761)



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Date: October 21st, 2025 5:55 PM
Author: splenetic crimson athletic conference hissy fit

All it did is remind everyone how large Amazon’s market share is. Stock is up quite a bit since the outage

(http://www.autoadmit.com/thread.php?thread_id=5788430&forum_id=2\u0026hid=",#49364773)



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Date: October 21st, 2025 6:00 PM
Author: Bright Puppy New Version

Yeah it was a window into how many companies are using EC2. Turns out it's such a fuckload that it took nine hours for Amazon servers to fully populate the EC2 DNS cache

(http://www.autoadmit.com/thread.php?thread_id=5788430&forum_id=2\u0026hid=",#49364790)



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Date: October 21st, 2025 5:56 PM
Author: Hot hairraiser sanctuary idiot

Israel was upgrading their backdoors

(http://www.autoadmit.com/thread.php?thread_id=5788430&forum_id=2\u0026hid=",#49364776)



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Date: October 21st, 2025 6:02 PM
Author: Bright Puppy New Version

Israel barely knows how to make a Zoom call these days. They can't hack shit

(http://www.autoadmit.com/thread.php?thread_id=5788430&forum_id=2\u0026hid=",#49364796)



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Date: October 21st, 2025 6:03 PM
Author: pearly house gaping

Engineering, champ.

(http://www.autoadmit.com/thread.php?thread_id=5788430&forum_id=2\u0026hid=",#49364799)