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I am a junior developer studying aws.

I am using it to look at the ALB as an A record on Route53.

A routing policy is used as a simple routing policy.

Will there be any downtime in changing the record option from a simple routing policy to a weighted routing policy?

I tested it by blowing curl using while, but I can't figure out how it works in the process of actually changing the option, so I ask a question!

bob
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Changes to the DNS records shouldn't result in downtime at all as long as the records point to servers/services that can handle requests.

DNS records are cached at multiple levels (client and/or multiple levels of resolvers), so getting a response shouldn't be a problem while you switch over. In fact, a bigger problem is that clients will most likely use the outdated information for a while due to the TTL setting.

DNS only really matters on initial contact anyway, afterwards the client talks directly to the server and any changes to DNS shouldn't have an impact.

Maurice
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  • @bob Feel free to accept this answer if it helped you, so others know that this question is resolved ;-) – Maurice May 04 '22 at 11:16