3 ms·
The major cases revolve around failure recovery, and traffic distribution. A 5 minute outage is not acceptable in many industries or at scale. If a load balan
by gwittel 6y ago
The major cases revolve around failure recovery, and traffic distribution. A 5 minute outage is not acceptable in many industries or at scale.
If a load balancer or DC fails we need to ensure traffic moves away fast. Similarly if you want to take a system out for maintenance or perform migrations.
- marcosdumay 6y ago> A 5 minute outage is not acceptable in many industries or at scale. Well, if that's the case, you better have your redundant systems on your normal DNS entries, because there is no chance you will distribute new entries over the internet in 5 minutes, whatever value you specify at the TTL.
- toast0 6y agoThere are tons of things that don't follow TTLs, but a large majority of normal people traffic does. Easily 90% of new connections will move following the TTL. Of course, some traffic got a DNS result once in 2003 and is going to use that forever. If it's important traffic, you can trace it and follow up with them. If not, you do the best you can and let the rest go.