packer.io
Byebye Veewee hello
Packer is a free and open source tool for creating golden images for multiple platforms from a single source configuration.
Quite powerful tool to create automated virtual images for #Vagrant, #Docker and other platforms.
Using btrfs for such images seems not to be a good idea. The same configuration just different filesystems: xfs 400MB, btrfs 600MB image size. 
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