Accessible to all, this book teaches the essentials to anyone who wants to become an effective and independent Debian GNU/Linux administrator.
It covers all the topics that a competent Linux administrator should master, from the installation and the update of the system, up to the creation of packages and the compilation of the kernel, but also monitoring, backup and migration, without forgetting advanced topics like SELinux or AppArmor setup to secure services, automated installations, or virtualization with Xen, KVM or LXC.
This is an excellent book, covering a lot of aspects of Linux in general but spiced with the Debian specific flavor including background on the past (and future) of the project and for example how Debian packaging works. Also where other Linux works are often limited to the classical 'ls' and 'cd' this also covers quite some modern topics like AppArmor and SELinux but also the migration from iptables and friends to nftp. It has for sure helped me to put some more recent developments in context. Even though the version I read is fully in line with Debian Buster (and thus very up to date), you can clearly feel some chapters start to show some of wrinkles, and some recent developments were not yet part of the book virtualization for example for example didn't progress into containers.