I use EC2 for my builds. It means that the builds are fast, clean and known reproducible since they all start from a clean Ubuntu LTS install. The build system

I use EC2 for my builds. It means that the builds are fast, clean and known reproducible since they all start from a clean Ubuntu LTS install. The build system gets all upstream tarballs (eg. glibc, openssl etc) from my S3 bucket. I also find EC2 really handy for quick experiments on different versions of Ubuntu and Debian. It is much quicker than setting up/maintaining images in VMware/VirtualBox.