Common Commands in CentOS

auto login

• 設定組態檔

$ sudo vim /etc/gdm/custom.conf

• 編輯內容

AutomaticLoginEnable=true
AutomaticLogin=<username>

RAID Status

# /home was mount under /dev/md0 and /var was mount under /dev/md1

$ mdadm --detail /dev/md0
$ mdadm --detail /dev/md1

Set the line number when using vim/vi

# vim /etc/vimrc

set nu                                                       # in the end of file

Install flash from adobe website

• Website: Link (http://get.adobe.com/tw/flashplayer/)

• Choose .rpm file

• install

$ rpm -ivh .rpm

Install RPMforge

• Check the file installed from website (http://wiki.centos.org/zh-tw/AdditionalResources/Repositories/RPMForge)

$ wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.i386.rpm
# cd /etc/yum.repos.d                 # yum repos folder

groupinstall developmental tools, including Perl

$ yum groupinstall "Development Tools"

Install python

$ sudo yum install python*

Install kernel-devel

$ sudo yum install kernel-devel

Install java and eclipse

• Website: http://www.oracle.com/technetwork/java/javase/downloads/index-jsp-138363.html

• download the latest JDK, this could be .rpm format

• Website: https://www.eclipse.org/downloads/

• download JEE version

$ gzip -d ./eclipse-jee-kepler-SR2-linux-gtk.tar.gz
$ tar -x ./eclipse-jee-kepler-SR2-linux-gtk.tar
$ mv ./eclipse /home/JKW/programs
$ /home/JKW/code/workspace                         # as default path

in eclipse, use oracle java as the default setting

open JEE -> Windows -> Preferences -> java -> Installed JREs -> Add -> "/usr/java/jdkx.x.x"

Firewall

• open port 80(http) and 443(https)

$ sudo vim /etc/sysconfig/iptables

# and add the following setting:
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT

• Firewall stop

# service iptables stop

Basic internet

# vim /etc/hosts

# add the end of the file
140.112.230.22 JKWCentOS JKWCentOS.ntu.edu.tw

# domainname -v ntu.edu.tw

NTFS kernel with backup mobile-disk

# yum search ntfs
# yum install ntfs-3g.i686

Build a shared folder connected among main and client OS

• 在 Windows VirtualBox 軟體下建立 Shared_CentOS 共用資料夾

$ sudo mount -t vboxsf Shared_CentOS /home/jkw/桌面/Shared_Windows

自動啟動服務

# level 0：表示關機
# level 1：單用戶模式
# level 2：無網絡連接的多用戶命令行模式
# level 3：有網絡連接的多用戶命令行模式
# level 4：不可用
# level 5：帶圖形界面的多用戶模式
# level 6：重新啟動

# 舉啟動 mysqld 為例
chkconfig --level 135 mysqld on