#networking
grep -l "networking" /portfolio/* · 3 entriesLocked 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 readA security group change that cut the app off from its database
A tidy-up of security group rules removed the one that let the app reach its database. Flow logs and CloudTrail found it in minutes.
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