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A comment on Migrating from EC2-Classic to VPC with zero downtime.

Re:Migrating from EC2-Classic to VPC with zero downtime by sciurus on Tuesday March 10, 2015 @03:26PM (#9180004)
"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.

https://aws.amazon.com/blogs/aws/classiclink-private-communi...

http://www.youtube.com/watch?v=HexrVfuIY1k&t=33m33s

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Re:Migrating from EC2-Classic to VPC with zero downtime by tirus on Tuesday March 10, 2015 @03:42PM (#9180104)
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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[deleted]
Re:Migrating from EC2-Classic to VPC with zero downtime by tirus on Tuesday March 10, 2015 @04:53PM (#9180543)
What a coincidence - that's exactly what I did too, except I used IPTables and just PATed the connections.
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