Linux: core OS = kernal + shell = application = completed OS
Shell = user interface: GUI, CLI
Application: File, email, website...
OS: WIndows server 2000,2003,2008,2012,2016 = completed OS
Complete OS: Distribution
- Redhat: CentOS, Fedora... => kernal from redhat
- Debian: Ubuntus...
- OpenSuSe: SuSe Enterprise 6,7
=> Linux Operating System =>
Linux kernal => Unix OS: Linux, MAC, Solaris => FREE license under GPL
CENTOS: hosting server: website/email => 80%
- Server
- Stable
- FREE support
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Power On => POST(PowerOnSelfTest): test hardware => Boot Loader1(MBR:0 first sector of HDD) => GRUB/Boot Manager => INIT (level0,1,2,3,4,5,6)
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Install OS: CENTOS:
- Physical server => RAID1 => OS
- VMWare Workstation => Test
Linux OS: 3 partitions
/ : Root directory (root partition) : C:/ => OS Kernal
/boot : Boot Partition: GRUB software for boot OS
/swap : virtual memory => page (windows): out of RAM
Windows OS: 1 partition
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