First released in October 2013, lmctfy is an operating-system-level virtualization technology implemented as open source by Google engineers. "Let Me Contain That For You (LMCTFY)". It is based on the Linux kernel's cgroups functionality. It has been managing Google's resource isolation needs since 2007. As it provides functionality similar to LXC and Docker, but at a lower level, the developers of this container technology have joined their efforts on the libcontainer library of the Docker and stopped maintaining the lmctfy open source repository since 2015.