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#!/usr/bin/env python
#
# Example script for creating and building a new Linux guest OS for Xen.
#
import Xc, XenoUtil, sys, os
# Variable declaration. Set these up properly later on, as needed.
nfsserv = nfspath = root_partn = usr_partn = ""
# STEP 1. Specify kernel image file.
image = "FULL_PATH_TO_IMAGE"
# STEP 2. How many megabytes of memory for the new domain?
memory_megabytes = 64
# STEP 3. A handy name for your new domain.
domain_name = "My new domain"
# STEP 4. Specify IP address, netmask and gateway for the new domain.
ipaddr = "ADDRESS"
netmask = XenoUtil.get_current_ipmask()
gateway = XenoUtil.get_current_ipgw()
# STEP 5a. Specify NFS server and path to rootfs (only needed for network boot)
nfsserv = "ADDRESS"
nfspath = "FULL_PATH_TO_ROOT_DIR"
# STEP 5b. Specify root (and possibly /usr) on local disc (if not NFS booting)
#root_partn = "/dev/sda2"
#usr_partn = "/dev/sda6"
# STEP 6. Check that the following cmdline setup is to your taste.
cmdline = "ip="+ipaddr+":"+nfsserv+":"+gateway+":"+netmask+"::eth0:off"
if root_partn:
# Boot from local disc. May specify a separate /usr.
cmdline = cmdline + " root="+root_partn+" ro"
if usr_partn:
" usr="+usr_partn
elif nfsserv:
# NFS boot
cmdline = cmdline + " root=/dev/nfs"
cmdline = cmdline + " nfsroot="+nfspath
if root_partn:
root_info = XenoUtil.lookup_blkdev_partn_info(root_partn)
if not root_info:
print "Could not obtain info on partition '" + root_partn + "'"
sys.exit()
if usr_partn:
usr_info = XenoUtil.lookup_blkdev_partn_info(usr_partn)
if not usr_info:
print "Could not obtain info on partition '" + usr_partn + "'"
sys.exit()
if not os.path.isfile( image ):
print "Image file '" + image + "' does not exist"
sys.exit()
xc = Xc.new()
id = xc.domain_create( mem_kb=memory_megabytes*1024, name=domain_name )
if id <= 0:
print "Error creating domain"
sys.exit()
if xc.linux_build( dom=id, image=image, cmdline=cmdline ):
print "Error building Linux guest OS"
xc.domain_destroy ( dom=id )
sys.exit()
if root_partn:
if xc.vbd_create( dom=id, vbd=root_info[0], writeable=1 ):
print "Error creating root VBD"
xc.domain_destroy ( dom=id )
sys.exit()
if xc.vbd_add_extent( dom=id,
vbd=root_info[0],
device=root_info[1],
start_sector=root_info[2],
nr_sectors=root_info[3] ):
print "Error populating root VBD"
xc.domain_destroy ( dom=id )
sys.exit()
if usr_partn:
if xc.vbd_create( dom=id, vbd=usr_info[0], writeable=0 ):
print "Error creating usr VBD"
xc.domain_destroy ( dom=id )
sys.exit()
if xc.vbd_add_extent( dom=id,
vbd=usr_info[0],
device=usr_info[1],
start_sector=usr_info[2],
nr_sectors=usr_info[3] ):
print "Error populating usr VBD"
xc.domain_destroy ( dom=id )
sys.exit()
XenoUtil.setup_vfr_rules_for_vif( id, 0, ipaddr )
if xc.domain_start( dom=id ):
print "Error starting domain"
xc.domain_destroy ( dom=id )
sys.exit()
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