3 ms·
Once you do a (planned) migration of a few sites, you quickly learn to set the DNS TTL to something small beforehand. Alternatively (if possible), keep both IP
by anonymousiam 6y ago
Once you do a (planned) migration of a few sites, you quickly learn to set the DNS TTL to something small beforehand. Alternatively (if possible), keep both IP blocks active for the TTL duration.
- Daho0n 6y agoMany (most?) last hop DNS resolvers (ISP) set their own cache time, sadly.
- comfydragon 6y agoNot to mention some IOT devices or cellular routers/devices might force a longer minimum cache TTL, to "minimize data usage". I worked on a device that did so (minimum pdnsd cache time of 25 hours). It ended up causing failures when our cloud server did a cut-over, dropping the TTLs 24 hours in advance. :(