wiki:TipAndDoc/boot

Version 7 (modified by mitty, 13 years ago) (diff)

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  1. GRUB2
    1. reduce grub entry

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
  1. 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)
  2. 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
  3. 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
  4. 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
  5. grubを修復する
    • sudo grub-install /dev/sda 
      Installation finished. No error reported.
    • sudo update-grub 
      Generating grub.cfg ...
Found linux image: /boot/vmlinuz-2.6.32-33-generic
Found initrd image: /boot/initrd.img-2.6.32-33-generic
Found linux image: /boot/vmlinuz-2.6.32-32-generic
Found initrd image: /boot/initrd.img-2.6.32-32-generic
Found linux image: /boot/vmlinuz-2.6.32-31-generic
Found initrd image: /boot/initrd.img-2.6.32-31-generic
Found memtest86+ image: /boot/memtest86+.bin
done
  6. GRUBメニュー修復完了
    • 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)
  7. 適宜、Filesystemの伸張をする
    • df -h / 
      Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2              93G   33G   56G  37% /
    • sudo resize2fs /dev/sda2 
      resize2fs 1.41.11 (14-Mar-2010)
Filesystem at /dev/sda2 is mounted on /; on-line resizing required
old desc_blocks = 6, new_desc_blocks = 7
Performing an on-line resize of /dev/sda2 to 29239024 (4k) blocks.
The filesystem on /dev/sda2 is now 29239024 blocks long.
    • df -h / 
      Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2             110G   33G   72G  32% /