Re:What happens when you update your DNS
by mrb on Tuesday June 23, 2020 @03:08AM
(#23610734)
"What I’d expect to happen in practice when updating a DNS record with a 5 minute TTL is that a large percentage of clients will move over to the new IPs quickly (like within 15 minutes),"
That's not true. The vast majority of clients will move to the new IP within the TTL, within 5min (not 15min). Then there will be some stragglers that slowly update over the next hours/days (typically poorly written bots)
Source : my own experience updating a site with 500k hits per month and sniffing and watching network traffic at the 3 endpoints: DNS, old IP, new IP.
Re:What happens when you update your DNS
by vbsteven on Tuesday June 23, 2020 @07:57AM
(#23612711)
Or any proxy using default nginx configuration which caches DNS resolution for upstream blocks at first use and never invalidate until the config is reloaded or Nginx restarted.
That's not true. The vast majority of clients will move to the new IP within the TTL, within 5min (not 15min). Then there will be some stragglers that slowly update over the next hours/days (typically poorly written bots)
Source : my own experience updating a site with 500k hits per month and sniffing and watching network traffic at the 3 endpoints: DNS, old IP, new IP.