Linux notes One

Shell environment configuration: Environment variables, configuration files

Avoid using the root login system

Any operation that only the kernel can perform is represented in the form of an interface called a system call

Encapsulation of system calls into more complex programs for others to use, called libraries, also known as repetitive wheel building

System boot = core + Shell

Api:application progrming Interface after development

Abi:application Binary Interface after compilation

ANSI: protocol

Cpu:x86,x86-64,power,powerpc,alpha, Itanium, ultrasparc,arm,mips,m68000,

Multi-tasking: Process

Process: program instance, program subset

Life cycle: Process switching (context switching)

GCC: preprocessing, compiling, compiling, linking GNU C complier

Dll:dynamic link Libraries dynamic link library (Windows)

So:shared Object Shared Objects (Linux)

The role of the bus: converting electrical signals to digital signals

Integrated development Environment (IDE): Includes text writing, gcc compilation, library links, etc.

Kernel management process through task structure

Process: By the parent process fork itself (requested by the parent process, the kernel completes),

Standard library for GLIBC:C

Operating system

GE (General Electric) Bell (Bell Labs) MIT (Massachusetts Institute of Technology) Multics

Bell:ken Thomson

DEC: Digital Equipment Company VAX PDP

Pdp-11,pdp-7:unics---Unix

B---C language

Bell-->at&t

Berkeley (University of California, Berkeley, USA)

Bill JOY:BSRG

Bsd:

Sun Microsystem:

Microsoft:xenix-->sco,sgi

DOS: Disk Operating system

Jobs:

VAX installed VMS,

WindowsNT (DOS+VMS)

Novell Netware

Bsd:bsrg,bsd4.3-lite

Freebsd:pc

Openbsd

NetBSD

Unix:system V

SunOS--Solaris UltraSPARC

Opensolaris:pc

Ibm:aix PowerPC

Hp:hp-ux,alpha

Due to UNIX charges, Professor Andrew of the Netherlands has made a Minix of UNIX.

Andrew:minix

linus:1991,8 Month

1994 linux1.0 Kernel released

Mit:stallman Radicals

Free, software industry freedom Movement

Gun:gun is not Unix (recursive abbreviation)

GPL: general Public License License

Have the following software

Emacs,gcc,bash VI

GNU Linux Development Source code

Cross-comoile Cross-compiling

CentOS: Community Edition operating system

Redhat 9---Fedora

Redhat Enterperise 6

Suse:opensuse

Debian---Ubuntu--Mint

Slackware

Lfs:linux from Scratch self-compiled Linux

Android

Linux kernel + busybox + Java Virtual machine + Android

Linux:gnu/linux

GPL---LGPL (loose GPL) Gplv2,gplv3

Bsd

Apache

Copyrights: Copyright (charge), copyleft (GPL)

Extracurricular Outreach: Understanding open Source Agreements

Package Manager: Debian (DPTD) Redhat (RPM)

Binary programs, configuration files, library files, Help files

Hardware-to-core and library files--Application

Realtime: Real-time response

File:

FileSystem: (file system) source data area data area

The software is divided into:

General Software:

Kernel: File system, network protocol stack, process management, encryption/decryption, drivers,

Track by Task List

Application software

Linux System Management:

Network, file (create, delete, move, permissions), user, file system, encryption/decryption, kernel (compile), boot process, package management,

Network Service Management:

Web (apache,nginx,mysql,php), NFS/SAMBA/FTP, Postfix/dovecot, network Security (iptables,tcp_wrapper), DNS

Mysql:crud, indexing, storage engine, backup, recovery, complexity, clustering, sharding

Cluster: Load (LB), high Availability (HA), GFS

Highly available Web:nginx, Haproxy, keeplived, Tomcat, Distributed File system, CDN

Virtualization: Xen,kvm,lxc/openvz

Iaas:openstack

Automated operations:

Massively parallel processing platform: Hadoop

Nosql:

System principle and Optimization:

Red Hat Certifications:

Wang Guowei, the great poet of Qing Dynasty

Hands and hands, operation and operation

This article is from the "Original Code" blog, please be sure to keep this source http://yuanchuang.blog.51cto.com/9897344/1831679

Linux notes One