Outage checklist
- Was it DNS?
- Was it a bad config update?
- Was it an overloaded single point of failure?
There's rarely a #4
- Was it DNS?
- Was it a bad config update?
- Was it an overloaded single point of failure?
There's rarely a #4
Although most of those fall under “bad config update” (although likewise that applies to DNS).
[0] https://blog.cloudflare.com/october-2021-facebook-outage/
A more accurate checklist item would be “is it the network?”
Build&Configure server, A few hour drive it down to the DC, rack the server. Get back home, try to access. No luck. Turned out I had forgotten I had forgotten to connect power and turn it on.