创建Linux下Xen虚拟机
mkdir /domU
1.创建虚拟机映像
dd if=/dev/zero of=xen.img bs=1M count=16000
dd if=/dev/zero of=xen2.img bs=1M count=16000
mkfs -t ext3 xen.img
mkfs -t ext3 xen2.img
mount -o loop /domU/xen.img /mnt
cp -ax /{bin,dev,etc,lib,lib64,opt,root,sbin,usr,var} /mnt
mkdir /mnt/{home,proc,selinux,srv,sys,tmp}
创建swap盘
mkswap /slview/swap1.img
vi /mnt/etc/fstab
/dev/hda1 / ext3 defaults 1 1
tmpfs /dev/shm tmpfs defaults,size=1024m 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/sdg swap swap defaults 0 0
---edit network
vi /mnt/etc/sysconfig/network
---edit ifcfg-eth0
vi /mnt/etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static
ONBOOT=yes
IPADDR=192.168.24.210
NETMASK=255.255.255.0
NETWORK=192.168.24.0
BROADCAST=192.168.24.255
-----gen initrd
mkinitrd -v -f --fstab /mnt/etc/fstab --with xenblk \
--with xennet --preload xenblk --preload xennet \
initrd-2.6.18-194.el5xen.wd.img `uname -r`
umount /mnt
---在/etc/inittab
co:2345:respawn:/sbin/agetty xvc0 9600 vt100-nav
>init q
>ln -s /dev/console /dev/xvc0
---创建内网网桥
vi ifcfg-xenbr2
DEVICE=xenbr2
BOOTPROTO=static
ONBOOT=yes
TYPE=Bridge
启动网桥
ifup xenbr2
----编辑虚拟机配置文件
name="oradb1"
kernel="/boot/vmlinuz-2.6.18-238.el5xen"
ramdisk="/boot/initrd-2.6.18-238.el5xen.wd.img"
memory="2048"
vcpus = 2
vif=['mac=00:16:3e:2e:40:cf,bridge=xenbr0','mac=00:16:3e:2e:a9:41,bridge=xenbr1']
disk=['tap:aio:/slview/db1.img,sda1,w','tap:aio:/slview/vot1.img,sdb,w!','tap:aio:/slview/vot2.img,sdc,w!','tap:aio:/slview/ocr1.img
,sdd,w!','tap:aio:/slview/ocr2.img,sde,w!','tap:aio:/root/data1.img,sdf,w!','tap:aio:/slview/swap1.img,sdg,w','tap:aio:/slview/ocr3.
img,sdh,w!','tap:aio:/slview/flash1.img,sdi,w!','tap:aio:/slview/flash2.img,sdj,w!','tap:aio:/root/data2.img,sdk,w!']
root="/dev/sda1 rw"
网桥配置：
修改 Xend 配置文件 /etc/xen/xend-config.sxp ，取消下面两行的注释:
(network-script network-bridge)
(vif-script vif-bridge)
使用brctl show来查看网桥
DomU的config中设置vif = ['bridge=xenbr0']
存储配置
[root@db6 xen]# cat oralinux
name = "oravm1"
kernel = "/boot/vmlinuz-2.6.18-194.el5xen"
ramdisk = "/boot/initrd-2.6.18-194.el5xen.wd.img"
memory = "256"
vcpus = 2
vif = [ 'ip=192.168.1.140,bridge=xenbr0','ip=192.168.100.140,bridge=xenbr1' ]
disk = [ 'file:/domU/xen.img,hda1,w','file:/domU/sdb.img,sdb,w!','file:/domU/sdc.img,sdc,w!','phy:/dev/mapper/oradata1,sdn,w!' ]
root = "/dev/hda1 ro "
------------------------------------------------------虚拟机-----------------
强制多虚拟机共享存储
phy:/dev/sda,sda,w! 加叹号
需要让xend为两块网卡创建bridge，需要修改/etc/xen/xend-config.sxp，将(network-script 'network-bridge')
改为：
(network-script 'my_network_script')
my_network_script是我们自己的脚本，创建/etc/xen/scripts/my_network_script内容如下：
#!/bin/sh
dir=$(dirname "$0")
"$dir/network-bridge" "$@" vifnum=0 netdev=eth0 bridge=xenbr0
"$dir/network-bridge" "$@" vifnum=1 netdev=eth1 bridge=xenbr1
将my_network_script加上执行权限：
chmod a+x /etc/xen/scripts/my_network_script
重启服务器，可以用ifconfig看到xend创建的4个网络接口
可以看到虚拟交换机上的连接如下：
[root@rac2 xen]# brctl show
bridge name bridge id STP enabled interfaces
xenbr0 8000.feffffffffff no vif1.0 dom1的eth0
peth0 主机的物理网卡0
vif0.0 Dom0的eth0
xenbr1 8000.feffffffffff no vif1.1 Dom1的eth1
peth1 主机的物理网卡1
vif0.1 Dom0的eth1
编辑虚拟机配置文件：
Error: Device 2048 (vbd) could not be connected. Failed to find an unused loop device
Error: Device 2064 (vbd) could not be connected. losetup -r /dev/loop8 /domU/sdb.img failed
>losetup -a 查看loop设备使用情况
再卸载 loop 模块 rmmod loop
>vi /etc/modprobe.conf
options loop max_loop=16
再重新加载 loop 模块检查是否生效
modprobe loopdmesg | grep loop # 应当能见到 loop: loaded (max 16 devices)
最后建立 loop 设备文件
ls -d /dev/loop*
mknod -m0660 /dev/loop9 b 7 8
chown root:disk /dev/loop9
mknod loop8 b 7 8
mknod loop9 b 7 9
Q: ADDRCONF(NETDEV_UP): vif1.0: link is not ready
A: 将/dev/sda1改为/dev/hda1
Q： 使用vnc报以下错误
[root@db1 ~]# su - grid
-bash-3.2$ xclock
Xlib: connection to ":1.0" refused by server
Xlib: No protocol specified
Error: Can't open display: :1.0
A: 用root帐号执行下列命令既可
xhost + localhost
Q：fdisk分区表无法保存
A：
chmod 755 *.img
file:/slview/db1.img 改成tape:aio:/slview/db1.img
Q：mkrootdev: expected fs options
mount: missing mount point
setuproot: moving /dev failed No such file or directory
setuproot: error mounting /proc: No such file or directory
setuproot: error mounting /sys: No such file or directory
switchroot: mount failed: No such file or directory
A：mkinitrd, /fstab内容
Q: /sbin/hwclock: error while loading shared libraries: libaudit.so.0: cannot open shared object file: Permission denied
A: 关闭selinux
