June 2018
Intermediate to advanced
368 pages
11h 1m
English
Content preview from Managing Mission - Critical Domains and DNS
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Planning migrations with DNS updates
It is fairly common that various infrastructure upgrades, migrations, and switches will involve making DNS updates, whether those will be temporary or permanent.
When making changes to individual components within a zone, such as migrating webservers or mail hosts, you usually want any changes to your zone to be out across the internet sooner than later. This means changing the effective TTL on either the entire zone or just the records involved in the migration to a low value before your maintenance window commences.
How long before? You want any resolvers out there that might have your existing records in their cache to refresh with your new, lower TTL before you start making changes. That means, at ...
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