Start an installation from GRUB
2014-08-07 22:21
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Start an installation from GRUB
Description
This tip will show you how to start an installation for network or hard disk from an existing GRUB bootloader from CentOS or another distro. This is useful if the system has no CD or DVD bootable device and it is not possible or convenient to boot from other removable media. The example uses CentOS 5 i386 but should work for other versions and architectures.Fetch boot kernel and initrd
The required installer vmlinux and initrd.img files can be gotten from loopback mount of an ISO image, from a close by mirror, or from an installation tree on hard disk. The example shows fetching them from centos.org:cd /boot wget http://mirror.centos.org/centos/5/os/i386/isolinux/vmlinuz mv vmlinuz vmlinuz-c5 wget http://mirror.centos.org/centos/5/os/i386/isolinux/initrd.img mv initrd.img initrd-c5.img
Create GRUB boot stanza
The following assumes that /dev/sda1 (or /dev/hda1 - first partition on first disk) is the boot partition. For /dev/sdb3 substitute (hd1,2) for (hd0,0), etc.title CentOS 5 Install root (hd0,0) kernel /vmlinuz-c5 ro initrd /initrd-c5.img
If there is no /boot partition and the root filesystem is on the first partition use
title CentOS 5 Install root (hd0,0) kernel /boot/vmlinuz-c5 ro initrd /boot/initrd-c5.img
Optional parameters can be added to the kernel. For example
title CentOS 5 Install root (hd0,0) kernel /vmlinuz-c5 ro keymap=no lang=en_US.UTF-8 method=http://10.0.0.10/repos/CentOS/5.5/os/i386 initrd /initrd-c5.img
Or
title CentOS 5 Install root (hd0,0) kernel /vmlinuz-c5 ro vnc vncconnect=192.168.15.2 ip=dhcp upgradeany lang=en_US keymap=us method=http://192.168.15.40/mrepo/centos5-x86_64/disc1/ ksdevice=link initrd /initrd-c5.img
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