1: Linux history
The father of free software (the father of open source): Richard Stallman.
Father of linux: Linus Benedict Torvalds first Benner (of Linus Benedict Torvalds)
linux kernel inventor. In 1991 he created one of the system kernel
2: Linux distributions common
RHEL (Red Hat Enterprise Linux) Red Hat Linux commercial companies, the main provider of services.
CentOS (community Enterprise operating System) community enterprises Caozuojitong free commercial software
Ubuntu (Ubuntu) entertainment-based, open source-based desktop applications GUN / Liunx Caozuojitong
Debian community
centos most commonly used
3: RHCE: Red Hat Certified Engineer level
1.RHCA Red Hat Certified Architect (the highest level)
2.RHCE RHCE
3.RHCSA Red Hat Certified System Administrator
4: Server Introduction
Tower server
rack server
blade server
wherein the server blade with up.
