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Can anyone explain how disabling ssh has anything to do with automation? We automate all our deployments through ssh and I was not aware of another way of doing.

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I believe the idea is that by preventing SSH the temptation to just pop in and tweak something manually isn't possible.

Yup, this was the intention. You could still allow your automation processes SSH access, just disable it for your users.

The idea is that if a user can't SSH in (at least not without modifying the firewall rules to allow it again), it will force them to try and automate what they were going to do instead. It worked well for me, but it's probably not for everyone.

ssh is handy if you're creating instances and then setting them up. However, if you're doing that on a regular basis, you might ought to use custom AMIs instead. Then (with proper "user data" management) you can just roll out instances that are already set up how you want.

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