Linux administration : a beginners guide ; [administer, secure, and virtualize Fedora, Red Hat, CentOS, Debian, and Ubuntu ; manage users, files, software, networking, and Internet and intranet services ; seamlessly interoperate with Windows-based systems and networks ; covers Linux kernel 3.x series, B-tree file system (Btrfs), systemd, GlusterFS, UEFI, KVM, and IPv6] (2012)