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Use a short TTL on the CDN subdomain you use. Then setup an alternative CDN provider in advance, so that you can switch from one to the other in a matter of minutes.

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Using a short TTL on a DNS entry has performance issues [1]. But a long one also isn't ideal [2].

[1] https://twitter.com/RichardTowers/status/1402312111078903812

[2] https://twitter.com/RichardTowers/status/1402312308077076484

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