DNS
DNS TTL and propagation, and why to lower it before a move
Why DNS changes seem slow and how to plan around TTL. Lower it days ahead, check resolvers, move mail safely and raise it again after a hosting move.
DNS on the blog
Nameservers, records, TTLs and certificates that depend on DNS, explained with the exact steps and the mistakes to avoid.
DNS
How to set up your own nameservers and glue records
Set up your own branded nameservers: glue records at the registrar, NS and A records, secondary DNS, testing and the mistakes that cause lame delegation.
DNS
Wildcard SSL with Let's Encrypt and DNS challenge
Get a wildcard certificate from Let's Encrypt with the DNS challenge: certbot or acme.sh, DNS provider API tokens, renewal hooks and fixes for common errors.
DNS
Automatic wildcard SSL: how it works and why you never renew by hand
How automatic SSL and wildcard certificates work: ACME, HTTP and DNS challenges, renewal timing and what to do when a renewal fails. No more expiry surprises.
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