This document summarizes Lucidchart's migration from EC2 Classic to VPC. Some key points: - Lucidchart chose to migrate to VPC for improved security, interoperability with other AWS services, and new features like internal ELBs and dynamic security groups. - Benefits of VPC included enhanced security from private IPs and network ACLs, easier ELB and reserved instance management. Drawbacks included extra cost and maintenance of NAT instances and more complex networking configuration. - Lucidchart's migration plan moved servers layer by layer starting with web servers, then applications, then databases, with monitoring servers moved last. Managing security groups carefully during the phased migration was important. - The top