RHEL Express.md

RHEL Express

Introduction

• RHEL(Red Hat Enterprise Linux)
  • Most popular Enterprise Linux distribution.
  • The de facto standard.
  • It's open source.
  • But software updates are available only through a paid subscription service.
• CentOS(Community ENTerprise Operating System) RECOMMENDED
  • Building from the source of RHEL.
  • 100% binary compatibility with RHEL.
  • Free to receive software updates.

Basic

TUI(Text User Interface)

• Terminal
• SSH(Secure SHell), a protocol and also an client/server applications.
• OpenSSH, client and server suite.
• Xshell and Xftp, client suite for windows.

Filesystem

Filesystem Hierarchy Standard(LSB - FHS)

• http://www.linuxfoundation.org/collaborate/workgroups/lsb/fhs
• http://en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard

/bin    存放最常用的程序 coreutils
/boot   存放grub，内核等启动相关文件
/dev    设备文件目录
/etc    配置文件目录
/home   用户目录
/lib    库文件及内核驱动模块
/var    存放经常变动文件的目录
/proc   虚拟文件目录

Basis

• pwd, display the current diretory.
• ls, list files and diretories under the the current diretory.
• cd, change to the specified diretory.

Configuration

Locale

• LANG, /etc/sysconfig/i18n
• Timezone, /etc/localtime
• Clock, /etc/sysconfig/clock

Hostname

• /etc/sysconfig/network
• /etc/hosts

Network

• Adapter, /etc/sysconfig/network-scripts/ifcfg-ethX
• Route, /etc/sysconfig/network-scripts/route-ethX
• Gateway, /etc/sysconfig/network
• DNS, /etc/resolv.conf

Service

• service daemon_name [start|staus|stop|restart]
• chkconfig --list
• chkconfig daemon_name [on|off]

Cron

• crontab -l, list scheduled tasks.
• crontab -e, edit scheduled tasks.
• /etc/crontab
• /etc/rc.local