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Along the same lines, I'm interested in how people handle the case of auto-scaling their web app (or anything that updates frequently via deploys). Is there a better solution than imaging a machine on every deploy and updating the auto scaling group to use the new AMI?

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How are you deploying? You 'should' push a tarball to s3 and have web nodes pull it down.

Red-black deploys via AMI changes are one way for sure, but those seem to be usually done via separate scaling groups entirely. Netflix has a lot of automation around this (see Asgard and AMInator)

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