CentOS4.4（32位）完美安装过程

　　(You can skip this chapter if you have already disabled SELinux during the basic system installation.)

　　SELinux is a security extension of CentOS that should provide extended security. In my opinion you don't need it to configure a secure system, and it usually causes more problems than advantages (think of it after you have done a week of trouble-shooting because some service wasn't working as expected, and then you find out that everything was ok, only SELinux was causing the problem). Therefore I disable it (this is a must if you want to install ISPConfig later on).

　　Edit /etc/selinux/config and set SELINUX=disabled:

　　vi /etc/selinux/config

　　Afterwards we must reboot the system:

　　shutdown -r now

　　First we import the GPG keys for software packages:

　　rpm --import /usr/share/rhn/RPM-GPG-KEY*