centos5.4裁剪笔记(5)-测试用硬盘引导镜像

再搞一个500M的vm硬盘出来挂上
参照前面吧cdlinux装到硬盘的思路，先做一个可以引导的硬盘
Fdisk –l可以看到没有格式化的hdb
分区
[root@locent5old ~]# fdisk /dev/hdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.

The number of cylinders for this disk is set to 1064.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): p

Disk /dev/hdb: 549 MB, 549453824 bytes
16 heads, 63 sectors/track, 1064 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes

Device Boot Start End Blocks Id System

Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1064, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-1064, default 1064):
Using default value 1064

Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[root@locent5old ~]# fdisk -l

Disk /dev/hda: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 382 3068383+ 83 Linux
/dev/hda2 383 447 522112+ 82 Linux swap / Solaris

Disk /dev/hdb: 549 MB, 549453824 bytes
16 heads, 63 sectors/track, 1064 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes

Device Boot Start End Blocks Id System
/dev/hdb1 1 1064 536224+ 83 Linux
[root@locent5old ~]#

格式化
mkfs.ext3 /dev/hdb1

Mount
Mkdir –p /mnt/test
Mount /dev/hdb11 /mnt/test

#复制boot/目录到U盘
cp -cpR my_centos/boot /mnt/test/

#复制新的initrd文件和相关grub配置文件
cp system.img /mnt/test/boot/

再来是安装grub
参照cdlinux的硬盘安装方法（可以用cdlinux或者centos5.5的livecd）
Mkdir –p boot/grub
/usr/share/grub/i386-redhat
Cp * cp * /mnt/test/boot/grub
Cd /mnt/test//boot/grub
Grub
root (hd0,0)
Setup (hd0)

boot成功!

注：换grubinstall试了试
grub-install --root-directory=/mnt/test /dev/hdb
这个启动会进入grub菜单…
怀疑是/dev/hdb的问题