This transport is based on piping native ssh (usually OpenSSH) and tar commands, so that all files are transferred as a single ssh stream providing dramatic performance improvements. This transport will only work with TK 1.4 and Linux/Unix like systems with mentioned binaries available in the PATH.
Only passwordless (using ssh key pair) communication is supported at the moment.
transport:
name: sshtar
compression: zlib
compression_level: 9
ssh_key: ~/.vagrant.d/insecure_private_key
username: vagrant
gem 'kitchen-transport-sshtar'