"Security groups (which define what IPs can access what ports, similar to basic IPTables firewall rules) cannot be shared between EC2-Classic and EC2-VPC,"
That is no longer true. In December 2014 Amazon launched ClassicLink, which lets you add EC2-Classic instances to VPC security groups.
Author here - Actually, the big problem was RDS EC2-Classic DB security groups, which ClassicLink doesn't help with. ClassicLink certainly is a feature, but it's not one that would have helped with the subset of groups that we were having trouble with.
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[ 67.3 ms ] story [ 331 ms ] threadThat is no longer true. In December 2014 Amazon launched ClassicLink, which lets you add EC2-Classic instances to VPC security groups.
https://aws.amazon.com/blogs/aws/classiclink-private-communi...
http://www.youtube.com/watch?v=HexrVfuIY1k&t=33m33s
https://github.com/Instagram/neti
And the blog article:
http://instagram-engineering.tumblr.com/post/89992572022/mig...
Now, Instgram's path was AWS EC2-Classic -> AWS VPC -> FB, however it is still relevant.