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Sample Xen Domain Files
The following files are XEN 3.2 config files (.CFG), one will run Windows Vista, The other runs a new linux Kernel, the differences are very few, but beware that a mounted CD will not boot the system, To boot the system you will need to put it on a loop.
Also, here is how to create a virtual hard disk file (You can use LVM or a partition), but if you want to use a virtual hard disk file, this is how we do it.
Assuming you want to put the .img file (A XEN Virtual Hard Drive) in the directory /HD2, and name it vhdd.img
dd if=/dev/zero of=/pathtoimage.img bs=1M count=10000
The above will result in a 10 GB Virtual Hard disk file for your XEN domain
To boot from an iso file, we create a loopback device from the iso file (No copeying, you can think of it as a pointer)
1- We find out what the next vacant loopback device is, the following will print something like /dev/loop1 take note of it
$ losetup -f
2- The actual trick, make sure you replace the path with your actual ISO
$ losetup -f /hd2/winxpsp2.iso
3- change the number in front of loop with the one you got in step 1 to see if it is pointing to has your CD / DVD will display something like /dev/loop1: [0811]:24577 (/hd2/winxpsp2.iso)
$ losetup /dev/loop1
| Windows Vista xen config file |
# Configuration file for the Xen instance atest, created
# by xen-tools 3.8 on Mon May 19 02:15:05 2008.
#
#
# Kernel + memory size
#
#kernel = '/boot/vmlinuz-2.6.24-17-xen'
#ramdisk = '/boot/initrd.img-2.6.24-17-xen'
builder = "hvm"
memory = '1024'
#
# Hostname
#
name = "atest"
vcpus=4
#cpus = "0,1,2,3"
pae=0
acpi=1#1 for windows vista....
apic=1 #If it works on your guest, keep it
#apic is One of the best known APIC architectures by intel, provides much more complex priority schemas than 8259A
#
# Networking
#
dhcp = "dhcp"
#vif = [ 'mac=00:16:3E:5F:C3:25' ]
vif = ['bridge=xenbr0']
#vif = ['ip = "10.0.11.13", bridge=xenbr0']
#vif = [ 'ip=192.168.0.132,mac=00:16:3E:5F:C3:25' ] if you want a static IP, this is the way to go
#
# Disk device(s).
#
root = '/dev/xvda2 ro'
disk = [
'tap:aio:/hd2/testmatch.img,hda,w',
'tap:aio:/hd2/TAFEELEH_V2.iso,hdc:cdrom,r'
#'phy:/dev/loop0,hdc:cdrom,r'
#To mount a CD and not boot from it
# normally, we would say 'tap:aio:/hd2/Fedora-9-x86_64-DVD.iso,hdc:cdrom,r' to load a cd rom into IDE-2 master
# : will display something like /dev/loop1: [0811]:24577 (/hd2/winxpsp2.iso)
#and now you can use 'phy:/dev/loop0,hdc:cdrom,r' as cd, remember to set boot="dc" on the next line if you want to boot from hdc (Our CD)
]
boot="dc"
#
# Behaviour
#
on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'
#device_model = "/usr/lib/xen/bin/qemu-dm"
#cdrom='/hd2/TAFEELEH_V2.iso' this is old thing, these days it is merged with disks
#boot='d' Also obsolete
sdl=1
#vnc=1
#vncviewer=0
stdvga=0#this means, use the cirrus VGA not the old VGA
#serial="pty"
#ne2000=0
#i commented this coz i added above
extra = '2 console=xvc0'
|
| Linux xen config file |
#
# Kernel + memory size
#
#kernel = '/boot/vmlinuz-2.6.24-17-xen'
#ramdisk = '/boot/initrd.img-2.6.24-17-xen'
#kernel = 'vmlinuz-2.6.24-16-generic'
####################################################################################
#Virtualization
####################################################################################
builder = "hvm" #(Slower) this one is when
#you want full virtualization for
#something like Windows
####################################################################################
#Memory
####################################################################################
memory = '1024'
####################################################################################
# Hostname
####################################################################################
name = "ubtest"
####################################################################################
#Processor/Chipset features
####################################################################################
vcpus=4 #Number of processors to use
#cpus = "0,1,2,3" #What processors
pae=1 #the PAE in processor is requiered
#by new linux kernels....
acpi=0 #1 required for windows vista....
apic=1 #If it works on your guest, keep it
#apic is One of the best known APIC
#architectures (by intel), provides
#much more complex priority schemas
####################################################################################
# Networking
####################################################################################
#vif = [ 'ip=192.168.0.132,mac=00:16:3E:5F:C0:25' ]
vif = ['bridge=xenbr0'] #if in only dhcp mode
#vif = ['ip = "10.0.11.13", bridge=xenbr0']
####################################################################################
# Disk device(s).
####################################################################################
root = '/dev/xvda2 ro' #found it somewhere, and forgot what it is for
#most probably for para virt guests
disk = [
'tap:aio:/hd2/ubdns5.img,hda,w',
#'tap:aio:/hd2/TAFEELEH_V2.iso,hdc:cdrom,r'
'phy:/dev/loop1,hdc:cdrom,r'
#To mount a CD and not boot from it
# normally, we would say 'tap:aio:/hd2/Fedora-9-x86_64-DVD.iso,hdc:cdrom,r' to load a cd rom into IDE-2 master
#to mount a CD for booting
#when we want to boot from from CDROM / DVD drive, we have to create a loopback device from the ISO file
# losetup -f : will tell us what loop device is free EX /dev/loop1
# losetup -f /hd2/winxpsp2.iso : The actual trick
# losetup /dev/loop1 : will display something like /dev/loop1: [0811]:24577 (/hd2/winxpsp2.iso)
#and now you can use 'phy:/dev/loop1,hdc:cdrom,r' as cd, remember to set boot="dc" on the next line if you want to boot from hdc (Our CD)
]
boot="dc"
#
# Behaviour
#
on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'
#device_model = "/usr/lib/xen/bin/qemu-dm"
#cdrom='/hd2/TAFEELEH_V2.iso' this is old shit, these days it is merged with disks
#boot='d' but how do we boot from CD now ?
sdl=1
#vnc=1
#vncviewer=0
stdvga=0#this means, use the cirrus VGA not the old VGA
#serial="pty"
#ne2000=0
#i commented this coz i added above
extra = '2 console=xvc0'
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