Automate EC2 Instance Setup with user-data Scripts (via) I knew about EC2’s user-data feature—what I didn’t know is that the Alestic and Canonical images are configured so that if the user-data starts with #! the instance will automatically execute it as a shell script as soon as it boots up (after networking has been configured).
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Yeah, it's similar to how we have setup our ec2 instances too, using puppet to bootstrap to do the configuring rather than just pure shell.