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Version 5 (modified by mitty, 13 years ago) (diff)
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GRUB2
1. reduce grub entry

TipAndDoc/boot

USBブート推進協議会
OS Circular

OS Circular is a framework of Internet Disk Image Distributor for anonymous OSes.
- via twitter:syonbori/status/42252753615065088

Minimal CD Image内のlinux, initrd.gzと http://jp.archive.ubuntu.com/ubuntu/dists/maverick/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/ などにあるlinux, initrd.gzは同じ
- http://jp.archive.ubuntu.com/ubuntu/dists/maverick/main/installer-amd64/current/images/netboot/mini.iso > linux, initrd.gz
- http://jp.archive.ubuntu.com/ubuntu/dists/maverick/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/linux
- http://jp.archive.ubuntu.com/ubuntu/dists/maverick/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/initrd.gz
- initrd.gzに関しては中身は同じ
- pxelinux.cfg等はパスが異なる

GRUB2

reduce grub entry

WindowsとLinuxのマルチブート -> Windowsを消してシングルブート化

元の状態

fdisk -lu /dev/sda

Disk /dev/sda: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders, total 234441648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x36ea3e05

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1              63      524351      262144+  82  Linux swap / Solaris
Partition 1 does not end on cylinder boundary.
/dev/sda2          524352    42467392    20971520+   7  HPFS/NTFS
/dev/sda3        42467393   234441647    95987127+  83  Linux

OSのインストールは、Windows 7 -> Ubuntu 10.04の順

grep menuentry /boot/grub/grub.cfg | tr \" \' | cut -d\' -f2

Ubuntu, with Linux 2.6.32-33-generic
Ubuntu, with Linux 2.6.32-33-generic (recovery mode)
Ubuntu, with Linux 2.6.32-32-generic
Ubuntu, with Linux 2.6.32-32-generic (recovery mode)
Ubuntu, with Linux 2.6.32-31-generic
Ubuntu, with Linux 2.6.32-31-generic (recovery mode)
Memory test (memtest86+)
Memory test (memtest86+, serial console 115200)
Windows 7 (loader) (on /dev/sda2)

NTFSパーティションの削除

root@Microknoppix:~# fdisk /dev/sdb

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1          33      262144+  82  Linux swap / Solaris
Partition 1 does not end on cylinder boundary.
/dev/sdb2   *          33        2644    20971520+   7  HPFS/NTFS
/dev/sdb3            2644       14594    95987127+  83  Linux

Command (m for help): d
Partition number (1-4): 2

Command (m for help): d
Partition number (1-4): 3

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (33-14593, default 33):
Using default value 33
Last cylinder, +cylinders or +size{K,M,G} (33-14593, default 14593):
Using default value 14593

Command (m for help): w

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1              63      524351      262144+  82  Linux swap / Solaris
Partition 1 does not end on cylinder boundary.
/dev/sdb2          524352   234436544   116956096+  83  Linux

backupしておいたdisk imageからLinuxパーティションを書き戻し
- root@Microknoppix:~# dd if=/media/sda/bb.sda bs=512 skip=42467393 of=/dev/sdb2
```
191974255+0 records in
191974255+0 records out
98290818560 bytes (98 GB) copied, 3223.76 s, 30.5 MB/s
```
正常には起動しなくなるため、grubから手動でUbuntuを起動する
- 以下の様に、grub consoleに落ちる
```
grub rescue> set
prefix=(hd0,3)/boot/grub
root=(hd0,3)
```
- Ubuntu で grub rescue -> grub-install を実行して grub を修復 - 新芽の手、ほんとの手
- 上記サイトに倣い、以下のようにしてGRUBメニューを起動する
```
set prefix=(hd0,2)/boot/grub
insmod (hd0,2)/boot/grub/normal.mod
normal
```
  - これで、以前のGRUB起動メニューが表示される
- 通常通り起動
grubを修復する
- sudo grub-install /dev/sda
- sudo update-grub

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