码迷,mamicode.com
首页 > 其他好文 > 详细

Xen虚拟机磁盘镜像模板制作(四)—CentOS 7

时间:2015-06-30 12:14:59      阅读:148      评论:0      收藏:0      [点我收藏+]

标签:

《Xen虚拟机磁盘镜像模板制作(三)—CentOS 7》一文中,我们已经成功制作出了 CentOS7 磁盘镜像。下面我们说明下如何通过它来生成目标虚拟机,同时测试下之前制作好的虚拟机磁盘镜像模版是否有问题。

1、创建目标虚拟机的系统盘:

[root@localhost ~]# lvcreate -L 15G -n centos7_vm vg0
  Logical volume "centos7_vm" created

2、查看成功创建的虚拟机系统盘:

[root@localhost ~]# lvs
  LV         VG   Attr   LSize  Origin Snap%  Move Log Copy%  Convert
  centos7_vm vg0  -wi-a- 15.00G

3、将之前导出的磁盘MBR主引导扇区 centos7_mbr 重新dd到目标虚拟机系统盘里:

[root@localhost ~]# dd if=/root/centos7_mbr of=/dev/vg0/centos7_vm 
2048+0 records in
2048+0 records out
1048576 bytes (1.0 MB) copied, 0.101847 seconds, 10.3 MB/s
[root@localhost ~]#

4、修改系统盘分区大小(以扇区数为单位):

[root@localhost ~]# echo "000001CA:00F8DF01" | xxd -r - /dev/vg0/centos7_vm 
[root@localhost ~]#

因为前面我们创建的目标虚拟机系统盘大小是15G,因此这里我们需要将磁盘分区1所占用的扇区数大小设置为00F8DF01(具体计算方式后续再整理),而000001CA则表示保存磁盘分区1占用扇区数的开始字节位置,具体说明请参考《磁盘MBR主引导扇区》

5、建立系统盘的磁盘分区映射,将系统盘的所有分区映射到/dev/mapper下:

[root@localhost ~]# kpartx -av /dev/vg0/centos7_vm 
add map centos7_vm1 : 0 31455232 linear /dev/vg0/centos7_vm 2048
[root@localhost ~]# ll /dev/mapper/
total 0
brw-rw---- 1 root disk 253,  1 Jun 30 10:47 centos7_vm1
crw------- 1 root root  10, 62 May  5 17:18 control
brw-rw---- 1 root disk 253,  0 Jun 30 10:46 vg0-centos7_vm
[root@localhost ~]#

红色的部分即为虚拟机磁盘的根分区。

6、格式化目标虚拟机根分区文件系统为ext3(或者ext4等等):

[root@localhost ~]# mkfs.ext3 /dev/mapper/centos7_vm1 
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
1966080 inodes, 3931904 blocks
196595 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4026531840
120 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks: 
    32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208

Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 34 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
[root@localhost ~]#

7、将目标虚拟机根分区mount到 /mnt(或者其他目录)下:

[root@localhost ~]# mount /dev/mapper/centos7_vm1 /mnt/
[root@localhost ~]# ll /mnt/
total 16
drwx------ 2 root root 16384 Jun 30 10:58 lost+found
[root@localhost ~]#

8、解压磁盘镜像模板系统文件 centos7_img 到 /mnt下,并 umout :

[root@localhost ~]# tar zxf /root/centos7_img -C /mnt
[root@localhost ~]# ll /mnt/
total 76
lrwxrwxrwx  1 root root     7 Jun 30 11:02 bin -> usr/bin
dr-xr-xr-x  4 root root  4096 Jun 19 22:36 boot
drwxr-xr-x  2 root root  4096 Jun 19 22:14 dev
drwxr-xr-x 74 root root  4096 Jun 26 10:26 etc
drwxr-xr-x  2 root root  4096 Jun 10  2014 home
lrwxrwxrwx  1 root root     7 Jun 30 11:02 lib -> usr/lib
lrwxrwxrwx  1 root root     9 Jun 30 11:02 lib64 -> usr/lib64
drwx------  2 root root 16384 Jun 19 22:14 lost+found
drwxr-xr-x  2 root root  4096 Jun 10  2014 media
drwxr-xr-x  2 root root  4096 Jun 10  2014 mnt
drwxr-xr-x  2 root root  4096 Jun 10  2014 opt
drwxr-xr-x  2 root root  4096 Jun 19 22:14 proc
dr-xr-x---  2 root root  4096 Jun 19 17:35 root
drwxr-xr-x  2 root root  4096 Jun 19 22:14 run
lrwxrwxrwx  1 root root     8 Jun 30 11:02 sbin -> usr/sbin
drwxr-xr-x  2 root root  4096 Jun 10  2014 srv
drwxr-xr-x  2 root root  4096 Jun 19 22:14 sys
drwxrwxrwt  7 root root  4096 Jun 23 19:17 tmp
drwxr-xr-x 13 root root  4096 Jun 19 22:15 usr
drwxr-xr-x 20 root root  4096 Jun 23 19:17 var
[root@localhost ~]# umount /mnt/

9、删除磁盘分区映射:

[root@localhost ~]# kpartx -d /dev/vg0/centos7_vm 
[root@localhost ~]# ll /dev/mapper/
total 0
crw------- 1 root root  10, 62 May  5 17:18 control
brw-rw---- 1 root disk 253,  0 Jun 30 10:46 vg0-centos7_vm
[root@localhost ~]#

10、至此,虚拟机系统盘已经准备好,下面就是需要准备虚拟机配置文件:

kernel = "/usr/lib/xen/boot/hvmloader"
builder=hvm
memory = 1024
name = "centos7_vm"
vif = [ bridge=eth0 ]
disk = [ phy:/dev/vg0/centos7_vm,hda,w ]
vcpus  = 1
on_reboot = restart
on_crash = restart
boot = c
sdl = 0
vnc = 1
vnclisten = 0.0.0.0
vncdisplay = 6
stdvga = 0
serial = pty
usbdevice = tablet
xen_platform_pci=1

11、启动虚拟机,并通过vnc登陆该虚拟机:

技术分享

至此,通过前面制作的 CentOS7 磁盘镜像模板成功生成了一个全新的虚拟机。

 

Xen虚拟机磁盘镜像模板制作(四)—CentOS 7

标签:

原文地址:http://www.cnblogs.com/CasonChan/p/4602037.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!