Description:CernVM 3 is a virtual machine image based on Scientific Linux 6 combined with a custom, virtualization-friendly Linux kernel.
Abstract:CernVM 3 is based on the µCernVM bootloader. Its outstanding feature is that it does not require a hard disk image to be distributed (hence “micro”). Instead it is distributed as a read-only image of ~20MB containing a Linux kernel and the CernVM-FS client. The rest of the operating system is downloaded and cached on demand by CernVM-FS. The virtual machine still requires a hard disk as a persistent cache, but this hard disk is initially empty and can be created instantaneously, instead of being pre-created and distributed.