Monday, August 18, 2014

Linux - netstat almost made my head explode

Created a newer faster metrics server cuz our old metrics server was too heavily loaded.
Updated the DNS entry to point to the new machine.
Kicked a buncha clients so they'd read the updated DNS entry.
ran  'netstat -pant' on the old metrics server and found a TON of IPs still connected to it.
scripted a reverse-dns-lookup against all the IPs.

Turns out there were a buncha hosts from OTHER teams connected to our server !
(they should not be!!!!)
Now I have to go track them all down and tell them to go away.

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