直接用ISO文件在linux上安装新系统

Use Case
-When you don’t have CD / DVD drive on your system.
-You have Fedora DVD but your system has only a CD Drive.
-You don’t want to waste time and resources in burning iso on optical media.
Pre-requisites
-You have a Fedora DVD iso or rescue cd iso.
-You have a Linux installation on your system.
-You have a partition (FAT32, ext2, ext3) which you will not format while installing the new OS.
How to proceed
Let us assume you want to install Fedora 9 on your system and you have a Linux distro already installed on your system. You have downloaded the Fedora DVD iso (Fedora-9-DVD-i686.iso). And you have a FAT32/ext2/ext3 partition /stuff/ which you will not format during installation.

Step 1 : Move the Fedora DVD iso to /stuff/ directory.

[root@saini saini]# mv Fedora-9-DVD-i686.iso /stuff/ [Enter]

 
Step 2 : Mount Fedora DVD iso on /mnt/

[root@saini saini]# mount /stuff/Fedora-9-DVD-i686.iso /mnt/ -ro loop [Enter] (do as root)

Step 3 : Copy the initrd.img and vmlinuz to /boot/ partition

[root@saini saini]# cd /mnt/isolinux/ [Enter]

[root@saini isolinux]# cp initrd.img vmlinuz /boot/ [Enter] (do as root) 

Step 4 : Create grub entry for booting into Fedora 9
Add these lines at the end of your /boot/grub/grub.conf file.

title Fedora 9 (New installation)

    kernel /vmlinuz

    initrd /initrd.img 

Step 5 : Note the device having Fedora DVD iso

[root@saini saini]# df -h [Enter]
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3              15G  9.5G  4.1G  70% /
/dev/sda8             135G  116G   13G  91% /stuff
/dev/sda5             4.8G  1.2G  3.4G  26% /home
/dev/sda1              99M   12M   82M  13% /boot

In this case /dev/sda8 contains Fedora DVD iso. Note this down as you need it later.

Step 6 : Reboot

Reboot your system and boot into the Fedora 9 (New installation) grub entry.

Step 7 : Install from hard disk

While in installation wizard, select “Hard drive” as installation method and choose /dev/sda8 as it contains the Fedora DVD iso. And rest is damn easy.