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We are powering down our data center for 12-18 hours during an infrastructure audit. We need to post a ‘temporarily unavailable’ message on websites affected by this outage.
In the past, I have changed the A-Record for the websites domain names to point to site hosted by a third party. The DNS changes appear to be instantaneous, but I worry about the potential 48 hour propagation lag.
Is there a better way to temporarily redirect a site during an outage?
Since there won’t be any server at the existing ip, you don’t have any other option.
To minimize the propagation issue, a few days ahead of the time you need to switch, you should decrease the TTL of the A record to something very short (like a few minutes), which should force clients and dns servers to query your dns more often.