Xen虚拟机的创建和启动

半虚拟化

获取Sample Image
到Jailtime.org下载，并解压（注默认root密码为password）
# tar jxvf centos.5-0.20070424.img.tar.bz2
centos.5-0.img
centos.5-0.xen2.cfg
centos.5-0.xen3.cfg
centos.swap

当然，也可以到http://www.rpath.com/rbuilder下载

创建配置文件
参考centos.5-0.xen2.cfg和centos.5-0.xen3.cfg，其内容为：
kernel = “/boot/vmlinuz-2.6.18-xen”
ramdisk = “/boot/initrd-2.6.18-xen.img”
memory = 256
name = “centos.5-0”
dhcp = “dhcp”
vif = [ ‘’ ]
disk = [‘tap:aio:/home/xen/centos.5-0.img,xvda1,w’,
‘tap:aio:/home/xen/centos.swap,xvda2,w’]
root = “/dev/xvda1 ro”

Integrating Loadable Kernel Modules into Your Root Filesystem
$ uname -r
2.6.18-xen
$ su
Password: *********
# mkdir -p /mnt/img
# mount -o loop centos.5-0.img /mnt/img
# cd /mnt/img/lib/modules
# cp -r /lib/modules/`uname -r` .
# ls
2.6.18-xen

修改其他的配置文件
# cat /mnt/img/etc/fstab
/dev/xvda1 / ext3 defaults 1 1
/dev/xvda2 none swap sw 0 0
none /dev/pts devpts gid=5,mode=620 0 0
none /dev/shm tmpfs defaults 0 0
none /proc proc defaults 0 0
none /sys sysfs defaults 0 0

# cat /mnt/img/etc/sysconfig/network-scripts/ifcfg-eth0
TYPE=Ethernet
DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes

# cat /mnt/img/etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp

# cd /
# sync
# umount /mnt/img

Creating Initial RAM Disks and Filesystems for Your Kernel
# yaird --output initrd-2.6.18-xen.img 2.6.18-xen
# mkinitramfs -o initrd-2.6.18-xen.img 2.6.18-xen
# mkinitrd -o initrd-2.6.18-xen.img 2.6.18-xen

启动虚拟机

# xm create centos.5-0.xen3.cfg -c

# xm list
Name ID Mem(MiB) VCPUs State Time(s)
Domain-0 0 1752 2 r----- 56978.8
Foresight 46 384 1 -b---- 1180.1
OpenSUSE 17 256 1 -b---- 2114.4
Ubuntu 34 256 1 -b---- 591.7
centos.5-0 45 256 1 -b---- 302.9
Freespire-HVM 49 256 1 -b---- 63.2