XEN

Материал из support.qbpro.ru

Здесь все что касается XEN 

VBoxManage clonehd centos6.vdi centos6.img -format RAW

Скрипт настройки XEN при обновлении Grub: 

/etc/grub.d/20_linux_xen

 #! /bin/sh
 set -e
 
 # grub-mkconfig helper script.
 # Copyright (C) 2006,2007,2008,2009,2010  Free Software Foundation, Inc.
 #
 # GRUB is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
 #
 # GRUB is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
 
 prefix="/usr"
 exec_prefix="${prefix}"
 datarootdir="${prefix}/share"
 
 . "${datarootdir}/grub/grub-mkconfig_lib"
 
 export TEXTDOMAIN=grub
 export TEXTDOMAINDIR="${datarootdir}/locale"
 
 CLASS="--class gnu-linux --class gnu --class os --class xen"
 
 if [ "x${GRUB_DISTRIBUTOR}" = "x" ] ; then
   OS=GNU/Linux
 else
   OS="${GRUB_DISTRIBUTOR} GNU/Linux"
   CLASS="--class $(echo ${GRUB_DISTRIBUTOR} | tr 'A-Z' 'a-z' | cut -d' ' -f1) ${CLASS}"
 fi
 
 # loop-AES arranges things so that /dev/loop/X can be our root device, but
 # the initrds that Linux uses don't like that.
 case ${GRUB_DEVICE} in
   /dev/loop/*|/dev/loop[0-9])
     GRUB_DEVICE=`losetup ${GRUB_DEVICE} | sed -e "s/^[^(]*(\([^)]\+\)).*/\1/"`
     # We can't cope with devices loop-mounted from files here.
     case ${GRUB_DEVICE} in
       /dev/*) ;;
       *) exit 0 ;;
     esac
   ;;
 esac
 
 if [ "x${GRUB_DEVICE_UUID}" = "x" ] || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
     || ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
     || uses_abstraction "${GRUB_DEVICE}" lvm; then
   LINUX_ROOT_DEVICE=${GRUB_DEVICE}
 else
   LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
 fi
 
 # Allow overriding GRUB_CMDLINE_LINUX and GRUB_CMDLINE_LINUX_DEFAULT.
 if [ "${GRUB_CMDLINE_LINUX_XEN_REPLACE}" ]; then
   GRUB_CMDLINE_LINUX="${GRUB_CMDLINE_LINUX_XEN_REPLACE}"
 fi
 if [ "${GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT}" ]; then
   GRUB_CMDLINE_LINUX_DEFAULT="${GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT}"
 fi
 
 if [ "x`${grub_probe} --device ${GRUB_DEVICE} --target=fs 2>/dev/null || true`" = xbtrfs ] \
     || [ "x`stat -f --printf=%T /`" = xbtrfs ]; then
   rootsubvol="`make_system_path_relative_to_its_root /`"
   rootsubvol="${rootsubvol#/}"
   if [ "x${rootsubvol}" != x ]; then
     GRUB_CMDLINE_LINUX="rootflags=subvol=${rootsubvol} ${GRUB_CMDLINE_LINUX}"
   fi
 fi
 
 linux_entry ()
 {
   os="$1"
   version="$2"
   xen_version="$3"
   recovery="$4"
   args="$5"
   xen_args="$6"
   if ${recovery} ; then
     title="$(gettext_quoted "%s, with Xen %s and Linux %s (recovery mode)")"
   else
     title="$(gettext_quoted "%s, with Xen %s and Linux %s")"
   fi
# дополнительные опции - можно выставить самому...
   printf 'set default="0" \n'
   printf 'set timeout=5 \n'
# ------------------------------------------------
   printf "menuentry '${title}' ${CLASS} {\n" "${os}" "${xen_version}" "${version}"
   if ! ${recovery} ; then
       save_default_entry | sed -e "s/^/\t/"
   fi
 
   if [ -z "${prepare_boot_cache}" ]; then
     prepare_boot_cache="$(prepare_grub_to_access_device ${GRUB_DEVICE_BOOT} | sed -e "s/^/\t/")"
   fi
   printf '%s\n' "${prepare_boot_cache}"
   xmessage="$(gettext_printf "Loading Xen %s ..." ${xen_version})"
   lmessage="$(gettext_printf "Loading Linux %s ..." ${version})"
   cat << EOF
         echo    '$xmessage'
         multiboot       ${rel_xen_dirname}/${xen_basename} placeholder ${xen_args}
         echo    '$lmessage'
         module  ${rel_dirname}/${basename} placeholder root=${linux_root_device_thisversion} ro ${args}
 EOF
   if test -n "${initrd}" ; then
     message="$(gettext_printf "Loading initial ramdisk ...")"
     cat << EOF
         echo    '$message'
         module  ${rel_dirname}/${initrd}
 EOF
   fi
   cat << EOF
 }
 EOF
 }
 
 linux_list=`for i in /boot/vmlinu[xz]-* /vmlinu[xz]-* /boot/kernel-*; do
     if grub_file_is_not_garbage "$i"; then
         basename=$(basename $i)
         version=$(echo $basename | sed -e "s,^[^0-9]*-,,g")
         dirname=$(dirname $i)
         config=
         for j in "${dirname}/config-${version}" "${dirname}/config-${alt_version}" "/etc/kernels/kernel-config-${version}" ; do
             if test -e "${j}" ; then
                 config="${j}"
                 break
             fi
         done
         if (grep -qx "CONFIG_XEN_DOM0=y" "${config}" 2> /dev/null || grep -qx "CONFIG_XEN_PRIVILEGED_GUEST=y" "${config}" 2> /dev/null); then echo -n "$i " ; fi
     fi
     done`
 if [ "x${linux_list}" = "x" ] ; then
     exit 0
 fi
 xen_list=`for i in /boot/xen*; do
         if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
       done`
 prepare_boot_cache=
 
 while [ "x${xen_list}" != "x" ] ; do
     list="${linux_list}"
     current_xen=`version_find_latest $xen_list`
     xen_basename=`basename ${current_xen}`
     xen_dirname=`dirname ${current_xen}`
     rel_xen_dirname=`make_system_path_relative_to_its_root $xen_dirname`
     xen_version=`echo $xen_basename | sed -e "s,.gz$,,g;s,^xen-,,g"`
     echo "submenu \"Xen ${xen_version}\" {"
     while [ "x$list" != "x" ] ; do
         linux=`version_find_latest $list`
         echo "Found linux image: $linux" >&2
         basename=`basename $linux`
         dirname=`dirname $linux`
         rel_dirname=`make_system_path_relative_to_its_root $dirname`
         version=`echo $basename | sed -e "s,^[^0-9]*-,,g"`
         alt_version=`echo $version | sed -e "s,\.old$,,g"`
         linux_root_device_thisversion="${LINUX_ROOT_DEVICE}"
 
         initrd=
         for i in "initrd.img-${version}" "initrd-${version}.img" \
             "initrd-${version}" "initrd.img-${alt_version}" \
             "initrd-${alt_version}.img" "initrd-${alt_version}" \
             "initramfs-genkernel-${version}" \
             "initramfs-genkernel-${alt_version}" ; do
             if test -e "${dirname}/${i}" ; then
                 initrd="$i"
                 break
             fi
         done
         if test -n "${initrd}" ; then
             echo "Found initrd image: ${dirname}/${initrd}" >&2
         else
     # "UUID=" magic is parsed by initrds.  Since there's no initrd, it can't work here.
             linux_root_device_thisversion=${GRUB_DEVICE}
         fi
 
         linux_entry "${OS}" "${version}" "${xen_version}" false \
             "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}" "${GRUB_CMDLINE_XEN} ${GRUB_CMDLINE_XEN_DEFAULT}"
         if [ "x${GRUB_DISABLE_RECOVERY}" != "xtrue" ]; then
             linux_entry "${OS}" "${version}" "${xen_version}" true \
                 "single ${GRUB_CMDLINE_LINUX}" "${GRUB_CMDLINE_XEN}"
         fi
 
         list=`echo $list | tr ' ' '\n' | grep -vx $linux | tr '\n' ' '`
     done
     echo "}"
     xen_list=`echo $xen_list | tr ' ' '\n' | grep -vx $current_xen | tr '\n' ' '`
 done

Монтирование образа хоста XEN

используем утилиту losetup:

проверяем наличие свободных устройств: 

losetup -a

если все свободно, монтируем сначала образ: 

losetup /dev/loop5 disk.img

смотрим смещение относительно начала: 

fdisk -l /dev/loop5

пример вывода: 

Disk /dev/loop5: 115.3 GB, 115343360000 bytes
255 heads, 63 sectors/track, 14023 cylinders, total 225280000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x390038ff

      Device Boot      Start         End      Blocks   Id  System
/dev/loop5p1   *          63   104872319    52436128+   7  HPFS/NTFS/exFAT

смещение для этого раздела равно 63, размер сектора 512 байт, для программного сдвига offset=63*512 (32256) создаем устройство типа /dev/sda1 только в варианте loop с которым будем работать: 

losetup -o 32256 /dev/loop6 /dev/loop5

теперь у нас аналог /dev/sda1 только устройство /dev/loop6 можно например его примонтировать: 

ntfs-3g /dev/loop6 /mnt

и делать там все что угодно..

Источник — https://support.qbpro.ru/index.php?title=XEN&oldid=350