#dns
grep -l "dns" /portfolio/* · 4 entriesus-east-1 DNS: finding out what we actually depended on
When DynamoDB's DNS record in us-east-1 went empty, services that 'didn't use us-east-1' had problems anyway. The outage was a free dependency map.
1 min readLocked out by our own outage
What I took from Facebook's October 2021 outage: a backbone change took the network down, and the tools to fix it were on the same network.
1 min readOur DNS provider went down and took us with it
What I took from the October 2016 Dyn attack: when one managed DNS provider fails, every site that relies only on it disappears, however healthy its servers are.
1 min read"The internet is down" tickets that were really DNS
Half the connectivity tickets I took said the internet was down. Most of the time the line was fine and name resolution wasn't.
1 min read