We're planning to switch our website from an A record that points to an IP address to a CNAME record that points to another site. I'm curious about how much downtime we might experience during this transition. I also think it would be wise to lower the TTL to the minimum value a few days before making the change—what do you think?
1 Answer
If both the original and new IPs are live at the same time, your site shouldn't actually go down. Some users might hit the old IP because their DNS is cached, but this will resolve when the TTL expires. Just a heads up—some DNS servers ignore TTL settings entirely, so keep that in mind! Also, remember that using CNAMEs on root domains is generally not recommended.
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