The Debian Administrator
http://static.debian-handbook.info/browse/stable/TheDebianAdministrator'sHandbook--DebianSqueezefromDiscoverytoMastery(Edition1)filetype:pdf
http://static.debian-handbook.info/browse/stable/TheDebianAdministrator'sHandbook--DebianSqueezefromDiscoverytoMastery(Edition1)filetype:pdf