June 2018
Intermediate to advanced
368 pages
11h 1m
English
Content preview from Managing Mission - Critical Domains and DNS
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How time is handled
Timestamps in data records are in TAI64 format and they have some interesting properties based on how you use them.
If you create a record with a timestamp in the future but a TTL of zero, that record will expire when the timestamp elapses.
Conversely, if you create a record with a non-zero TTL and a timestamp in the future, that means it will not resolve until after the timestamp passes.
This provides some nifty mechanisms to schedule maintenance windows and migrations.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.