[root@xxx ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-957.10.1.vz7.85.17
Found initrd image: /boot/initramfs-3.10.0-957.10.1.vz7.85.17.img
Found linux image: /boot/vmlinuz-3.10.0-862.20.2.vz7.73.29
Found initrd image: /boot/initramfs-3.10.0-862.20.2.vz7.73.29.img
Found linux image: /boot/vmlinuz-3.10.0-862.11.6.vz7.64.7
Found initrd image: /boot/initramfs-3.10.0-862.11.6.vz7.64.7.img
Found linux image: /boot/vmlinuz-3.10.0-862.9.1.vz7.63.3
Found initrd image: /boot/initramfs-3.10.0-862.9.1.vz7.63.3.img
Found linux image: /boot/vmlinuz-3.10.0-693.21.1.vz7.48.2
Found initrd image: /boot/initramfs-3.10.0-693.21.1.vz7.48.2.img
Found linux image: /boot/vmlinuz-0-rescue-e6718a50eaca4895b2d1dbf45bc7c021
Found initrd image: /boot/initramfs-0-rescue-e6718a50eaca4895b2d1dbf45bc7c021.img
Found CentOS Linux release 7.6.1810 (Core)  on /dev/ploop15360p1
Found CentOS Linux release 7.6.1810 (Core)  on /dev/ploop16120p1
Found CentOS release 5.11 (Final) on /dev/ploop24192p1
Found Ubuntu 16.04.4 LTS (16.04) on /dev/ploop25453p1
Found CentOS release 5.11 (Final) on /dev/ploop27099p1
Found CentOS Linux release 7.6.1810 (Core)  on /dev/ploop30745p1
Found CentOS release 6.10 (Final) on /dev/ploop30895p1
Found CentOS release 6.10 (Final) on /dev/ploop35412p1
Found CentOS Linux release 7.6.1810 (Core)  on /dev/ploop35431p1
Found CentOS Linux release 7.6.1810 (Core)  on /dev/ploop40339p1
Found CentOS Linux release 7.6.1810 (Core)  on /dev/ploop50665p1
Found CentOS release 6.10 (Final) on /dev/ploop53483p1
Found CentOS release 5.11 (Final) on /dev/ploop54152p1
done

[root@xxx ~]# cat /boot/grub2/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
set pager=1

if [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
   set default="${next_entry}"
   set next_entry=
   save_env next_entry
   set boot_once=true
else
   set default="${saved_entry}"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

terminal_output console
if [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
  set timeout=5
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/00_tuned ###
set tuned_params=""
set tuned_initrd=""
### END /etc/grub.d/00_tuned ###

### BEGIN /etc/grub.d/01_users ###
if [ -f ${prefix}/user.cfg ]; then
  source ${prefix}/user.cfg
  if [ -n "${GRUB2_PASSWORD}" ]; then
    set superusers="root"
    export superusers
    password_pbkdf2 root ${GRUB2_PASSWORD}
  fi
fi
### END /etc/grub.d/01_users ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Virtuozzo 7.0.10 (3.10.0-957.10.1.vz7.85.17)' --class openvz --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-957.10.1.vz7.85.17-advanced-8099cb68-5795-444d-9ccf-460cc7bac2b8' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod part_gpt
        insmod diskfilter
        insmod mdraid1x
        insmod ext2
        set root='mduuid/89c3f1a2c4ec6ef6ad62b90f715e3111'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint='mduuid/89c3f1a2c4ec6ef6ad62b90f715e3111'  1a220f99-00e6-42c5-b1dd-2a01225659dd
        else
          search --no-floppy --fs-uuid --set=root 1a220f99-00e6-42c5-b1dd-2a01225659dd
        fi
        linux16 /vmlinuz-3.10.0-957.10.1.vz7.85.17 root=/dev/mapper/openvz-root ro crashkernel=auto rd.lvm.lv=openvz/root rd.md.uuid=01cba6c6:00c669cf:fad77f81:67a61f20 rd.md.uuid=89c3f1a2:c4ec6ef6:ad62b90f:715e3111 rd.md.uuid=15e18a8a:0ebcafe8:5db9e077:854a62a4 quiet
        initrd16 /initramfs-3.10.0-957.10.1.vz7.85.17.img
}
menuentry 'Virtuozzo 7.0.10 (3.10.0-862.20.2.vz7.73.29)' --class openvz --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-862.20.2.vz7.73.29-advanced-8099cb68-5795-444d-9ccf-460cc7bac2b8' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod part_gpt
        insmod diskfilter
        insmod mdraid1x
        insmod ext2
        set root='mduuid/89c3f1a2c4ec6ef6ad62b90f715e3111'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint='mduuid/89c3f1a2c4ec6ef6ad62b90f715e3111'  1a220f99-00e6-42c5-b1dd-2a01225659dd
        else
          search --no-floppy --fs-uuid --set=root 1a220f99-00e6-42c5-b1dd-2a01225659dd
        fi
        linux16 /vmlinuz-3.10.0-862.20.2.vz7.73.29 root=/dev/mapper/openvz-root ro crashkernel=auto rd.lvm.lv=openvz/root rd.md.uuid=01cba6c6:00c669cf:fad77f81:67a61f20 rd.md.uuid=89c3f1a2:c4ec6ef6:ad62b90f:715e3111 rd.md.uuid=15e18a8a:0ebcafe8:5db9e077:854a62a4 quiet
        initrd16 /initramfs-3.10.0-862.20.2.vz7.73.29.img
}
menuentry 'Virtuozzo 7.0.10 (3.10.0-862.11.6.vz7.64.7)' --class openvz --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-862.11.6.vz7.64.7-advanced-8099cb68-5795-444d-9ccf-460cc7bac2b8' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod part_gpt
        insmod diskfilter
        insmod mdraid1x
        insmod ext2
        set root='mduuid/89c3f1a2c4ec6ef6ad62b90f715e3111'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint='mduuid/89c3f1a2c4ec6ef6ad62b90f715e3111'  1a220f99-00e6-42c5-b1dd-2a01225659dd
        else
          search --no-floppy --fs-uuid --set=root 1a220f99-00e6-42c5-b1dd-2a01225659dd
        fi
        linux16 /vmlinuz-3.10.0-862.11.6.vz7.64.7 root=/dev/mapper/openvz-root ro crashkernel=auto rd.lvm.lv=openvz/root rd.md.uuid=01cba6c6:00c669cf:fad77f81:67a61f20 rd.md.uuid=89c3f1a2:c4ec6ef6:ad62b90f:715e3111 rd.md.uuid=15e18a8a:0ebcafe8:5db9e077:854a62a4 quiet
        initrd16 /initramfs-3.10.0-862.11.6.vz7.64.7.img
}
menuentry 'Virtuozzo 7.0.10 (3.10.0-862.9.1.vz7.63.3)' --class openvz --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-862.9.1.vz7.63.3-advanced-8099cb68-5795-444d-9ccf-460cc7bac2b8' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod part_gpt
        insmod diskfilter
        insmod mdraid1x
        insmod ext2
        set root='mduuid/89c3f1a2c4ec6ef6ad62b90f715e3111'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint='mduuid/89c3f1a2c4ec6ef6ad62b90f715e3111'  1a220f99-00e6-42c5-b1dd-2a01225659dd
        else
          search --no-floppy --fs-uuid --set=root 1a220f99-00e6-42c5-b1dd-2a01225659dd
        fi
        linux16 /vmlinuz-3.10.0-862.9.1.vz7.63.3 root=/dev/mapper/openvz-root ro crashkernel=auto rd.lvm.lv=openvz/root rd.md.uuid=01cba6c6:00c669cf:fad77f81:67a61f20 rd.md.uuid=89c3f1a2:c4ec6ef6:ad62b90f:715e3111 rd.md.uuid=15e18a8a:0ebcafe8:5db9e077:854a62a4 quiet
        initrd16 /initramfs-3.10.0-862.9.1.vz7.63.3.img
}
menuentry 'Virtuozzo 7.0.10 (3.10.0-693.21.1.vz7.48.2)' --class openvz --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-693.21.1.vz7.48.2-advanced-8099cb68-5795-444d-9ccf-460cc7bac2b8' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod part_gpt
        insmod diskfilter
        insmod mdraid1x
        insmod ext2
        set root='mduuid/89c3f1a2c4ec6ef6ad62b90f715e3111'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint='mduuid/89c3f1a2c4ec6ef6ad62b90f715e3111'  1a220f99-00e6-42c5-b1dd-2a01225659dd
        else
          search --no-floppy --fs-uuid --set=root 1a220f99-00e6-42c5-b1dd-2a01225659dd
        fi
        linux16 /vmlinuz-3.10.0-693.21.1.vz7.48.2 root=/dev/mapper/openvz-root ro crashkernel=auto rd.lvm.lv=openvz/root rd.md.uuid=01cba6c6:00c669cf:fad77f81:67a61f20 rd.md.uuid=89c3f1a2:c4ec6ef6:ad62b90f:715e3111 rd.md.uuid=15e18a8a:0ebcafe8:5db9e077:854a62a4 quiet
        initrd16 /initramfs-3.10.0-693.21.1.vz7.48.2.img
}
menuentry 'Virtuozzo 7.0.10 (0-rescue-e6718a50eaca4895b2d1dbf45bc7c021)' --class openvz --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-e6718a50eaca4895b2d1dbf45bc7c021-advanced-8099cb68-5795-444d-9ccf-460cc7bac2b8' {
        load_video
        insmod gzio
        insmod part_gpt
        insmod part_gpt
        insmod diskfilter
        insmod mdraid1x
        insmod ext2
        set root='mduuid/89c3f1a2c4ec6ef6ad62b90f715e3111'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-flop