How do you put up a maintenance page for AWS when your instances are behind an ELB?
问题 How do you put up a maintenance page in AWS when you want to deploy new versions of your application behind an ELB? We want to have the ELB route traffic to the maintenance instance while the new auto-scaled instances are coming up, and only "flip over" to the new instances once they're fully up. We use auto-scaling to bring existing instances down and new instances, which have the new code, up. The scenario we're trying to avoid is having the ELB serve both traffic to new EC2 instances while