How to Backup and Restore MBR within Logical Volumes?
Mr. Teo En Ming (Zhang Enming)
space.time.universe at gmail.com
Fri Nov 13 12:31:01 UTC 2009
On Fri, Nov 13, 2009 at 5:35 PM, Mr. Teo En Ming (Zhang Enming) <
space.time.universe at gmail.com> wrote:
>
>
> On Fri, Nov 13, 2009 at 1:25 PM, Mr. Teo En Ming (Zhang Enming) <
> space.time.universe at gmail.com> wrote:
>
>>
>>
>> On Fri, Nov 13, 2009 at 11:17 AM, Mr. Teo En Ming (Zhang Enming) <
>> space.time.universe at gmail.com> wrote:
>>
>>>
>>>
>>> On Fri, Nov 13, 2009 at 5:40 AM, Sergey Vlasov <vsu at altlinux.ru> wrote:
>>>
>>>> On Fri, Nov 13, 2009 at 12:57:22AM +0800, Mr. Teo En Ming (Zhang Enming)
>>>> wrote:
>>>> [...]
>>>> > # VM 11: Rocks 5.1 x86_64 HPC Compute Cluster HVM domU
>>>> >
>>>> > kpartx -av /dev/virtualmachines/rocks0001
>>>> >
>>>> > dd if=/dev/virtualmachines/rocks0001 of=$DEST/rocks0001.mbr bs=512
>>>> count=1
>>>> >
>>>> > partimage -d -M -b -z1 save /dev/mapper/virtualmachines-rocks0001p1
>>>> > $DEST/virtualmachines-rocks0001p1.img
>>>> >
>>>> > partimage -d -M -b -z1 save /dev/mapper/virtualmachines-rocks0001p2
>>>> > $DEST/virtualmachines-rocks0001p2.img
>>>> >
>>>> > partimage -d -M -b -z1 save /dev/mapper/virtualmachines-rocks0001p5
>>>> > $DEST/virtualmachines-rocks0001p5.img
>>>>
>>>> Note that this VM (and some other VMs listed in your script) uses
>>>> logical partitions. In this case just saving a copy of MBR will not
>>>> be enough to save partition layout - MBR describes only 4 primary
>>>> partitions, and restoring just MBR will not restore extended
>>>> partitions.
>>>>
>>>> One way to backup the complete partition layout is by saving also
>>>> the output of "sfdisk -d $device"; the resulting file can be used as
>>>> input to sfdisk to restore all partitions, including logical ones.
>>>> Saving MBR is still needed together with sfdisk, because it saves
>>>> the boot code (used for HVM) and CHS geometry information (which can
>>>> be used during boot in some cases).
>>>>
>>>> -----BEGIN PGP SIGNATURE-----
>>>> Version: GnuPG v1.4.10 (GNU/Linux)
>>>>
>>>> iEYEARECAAYFAkr8gM8ACgkQW82GfkQfsqLa+QCaAqpO5NWhYHtKVi3M5ytERw27
>>>> eC0AnjsJuG34MAR1jZRejBiJCVybQvc1
>>>> =RRGH
>>>> -----END PGP SIGNATURE-----
>>>>
>>>>
>>>> _______________________________________________
>>>> Xen-users mailing list
>>>> Xen-users at lists.xensource.com
>>>> http://lists.xensource.com/xen-users
>>>>
>>>
>>>
>>>
>>> Thank you for pointing this out. Otherwise I would made incomplete
>>> backups.
>>>
>>> Would it be best practice to always backup both the MBR and the partition
>>> geometry using sfdisk whenever cloning our harddisks on desktops and
>>> servers?
>>>
>>> Besides sfdisk, there are also other partitioning tools like fdisk,
>>> cfdisk, and parted.
>>>
>>> Could these other tools also be used for backing up the partition
>>> geometry like sfdisk?
>>>
>>> Thank you.
>>>
>>>
>>> --
>>> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
>>> Engineering)
>>> Alma Maters:
>>> (1) Singapore Polytechnic
>>> (2) National University of Singapore
>>> My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
>>> My Secondary Blog: http://enmingteo.wordpress.com
>>> My Youtube videos: http://www.youtube.com/user/enmingteo
>>> Email: space.time.universe at gmail.com
>>> Mobile Phone (Starhub Prepaid): +65-8369-2618
>>> Street: Bedok Reservoir Road
>>> Country: Singapore
>>>
>>
>> Hi,
>>
>> I have made some improvements to the backup/cloning script. Please help me
>> to vet it through for any mistakes. Thank you very much!
>>
>>
>> <SCRIPT>
>>
> ***SNIPPED***
> </SCRIPT>
>>
>> --
>> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
>> Engineering)
>> Alma Maters:
>> (1) Singapore Polytechnic
>> (2) National University of Singapore
>> My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
>> My Secondary Blog: http://enmingteo.wordpress.com
>> My Youtube videos: http://www.youtube.com/user/enmingteo
>> Email: space.time.universe at gmail.com
>> Mobile Phone (Starhub Prepaid): +65-8369-2618
>> Street: Bedok Reservoir Road
>> Country: Singapore
>>
>
> Hi All,
>
> This is the final version of my backup script. I have gone through the
> script once to make sure there are no mistakes. If I want to capture any
> errors during the execution of the backup/cloning script, which of the
> following commands do I run?
>
> # ./backup-script.sh > backup.log
>
> OR
>
> # ./backup-script.sh 2> backup.log
>
> After completing the backup script, I will proceed to write the restore
> script.
>
> If there are any errors, please let me know because I do not want to make
> any mistakes with the cloning process. Thank you.
>
> <SCRIPT>
> ***SNIPPED***
> </SCRIPT>
>
> --
> Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
> Engineering)
> Alma Maters:
> (1) Singapore Polytechnic
> (2) National University of Singapore
> My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
> My Secondary Blog: http://enmingteo.wordpress.com
> My Youtube videos: http://www.youtube.com/user/enmingteo
> Email: space.time.universe at gmail.com
> Mobile Phone (Starhub Prepaid): +65-8369-2618
> Street: Bedok Reservoir Road
> Country: Singapore
>
Dear All,
This is the *initial* version of my data restore script.
<SCRIPT>
#!/bin/sh
###############################################################################################################
###############################################################################################################
# Script to Restore Xen Host/Dom0 and all DomUs which are using Logical
Volumes as Virtual Hard Disks
###############################################################################################################
###############################################################################################################
# Written by:
# Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Engineering)
# Alma Maters:
# (1) Singapore Polytechnic
# (2) National University of Singapore
# Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
# Secondary Blog: http://enmingteo.wordpress.com
# Youtube Videos: http://www.youtube.com/user/enmingteo
# Xen Tutorials and Video Demos: http://www.xen.org/support/tutorial.html
# Email: space.time.universe at gmail.com
# MSN: teoenming at hotmail.com
# Mobile Phone (Starhub Prepaid): +65-8369-2618
# Street: Bedok Reservoir Road
# Country: Singapore
# First written: 13 November 2009 Friday 6:49 P.M. Singapore time
# Last updated: 13 November 2009 Friday 8:25 P.M. Singapore time
# REFERNCE: "Geek Sheet: Bare-metal backup and recovery", May 7th, 2008,
Jason Perlow
# URL: http://blogs.zdnet.com/BTL/?p=8759
# Usage Instructions:
# Boot up your desktop/server with System Rescue CD version 1.3.2 for
i386/amd64.
# Then execute this restore script. You need to adapt this script to work
for your environment.
# Download System Rescue CD from http://www.sysresccd.org/Main_Page
# No. of QC Checks Performed on this restore script: 0
###############################################################################################################
# Declare Variables
###############################################################################################################
HARDDISK=/dev/sda
SOURCE=/media/hitachi/test
###############################################################################################################
###############################################################################################################
# Restoring Xen Host/Dom0
###############################################################################################################
###############################################################################################################
# Restore the Master Boot Record
dd if=$SOURCE/f11-xen-dom0-sda.mbr of=$HARDDISK bs=512 count=1
# Restore the Partition Geometry
sfdisk $HARDDISK < $SOURCE/f11-xen-dom0-partition-geometry-sda.sfdisk
# Re-create the LVM2 PV containing the host operating system/dom0
pvcreate --uuid ??? /dev/sda2
# Re-create the LVM2 PV containing all the virtual machines
pvcreate --uuid ??? /dev/sda3
# Restore the LVM2 metadata for the volume group containing the host
operating system/dom0
vgcfgrestore --file $SOURCE/vg_fedora11_host-vgcfg.lvm2.metadata
vg_fedora11_host
# Restore the LVM2 metadata for the volume group containing all the virtual
machines
vgcfgrestore --file $SOURCE/virtualmachines-vgcfg.lvm2.metadata
virtualmachines
# Activate all the volume groups
vgchange -ay
# Restore all filesystems for the host operating system/dom0
fsarchiver restfs -v $SOURCE/f11-xen-dom0-filesystems.fsa
id=0,dest=/dev/sda1 \
id=1,dest=/dev/vg_fedora11_host/lv_home \
id=2,dest=/dev/vg_fedora11_host/lv_root \
id=3,dest=/dev/vg_fedora11_host/lv_var
# Re-create the swap partition
mkswap /dev/vg_fedora11_host/lv_swap
###############################################################################################################
###############################################################################################################
# Restoring Xen-based Virtual Machines/DomUs/Guest Operating Systems/VMs
###############################################################################################################
###############################################################################################################
### NOTE: Check for swap partitions in each virtual machine and do a mkswap.
# VM 1: Fedora 11 x86_64 PV domU (MPICH2 Virtual Supercomputer Center)
###############################################################################################################
zcat $SOURCE/virtualmachines-f11-pv-hpc-node0001.img.gz | dd
of=/dev/virtualmachines/f11-pv-hpc-node0001
# VM 2: Fedora 11 x86_64 PV domU (MPICH2 Virtual Supercomputer Center)
###############################################################################################################
zcat $SOURCE/virtualmachines-f11-pv-hpc-node0002.img.gz | dd
of=/dev/virtualmachines/f11-pv-hpc-node0002
# VM 3: Fedora 11 x86_64 PV domU (MPICH2 Virtual Supercomputer Center)
###############################################################################################################
zcat $SOURCE/virtualmachines-f11-pv-hpc-node0003.img.gz | dd
of=/dev/virtualmachines/f11-pv-hpc-node0003
# VM 4: Fedora 11 x86_64 PV domU (MPICH2 Virtual Supercomputer Center)
###############################################################################################################
zcat $SOURCE/virtualmachines-f11-pv-hpc-node0004.img.gz | dd
of=/dev/virtualmachines/f11-pv-hpc-node0004
# VM 5: Fedora 11 x86_64 PV domU (MPICH2 Virtual Supercomputer Center)
###############################################################################################################
zcat $SOURCE/virtualmachines-f11-pv-hpc-node0005.img.gz | dd
of=/dev/virtualmachines/f11-pv-hpc-node0005
# VM 6: Fedora 11 x86_64 PV domU (MPICH2 Virtual Supercomputer Center)
###############################################################################################################
zcat $SOURCE/virtualmachines-f11-pv-hpc-node0006.img.gz | dd
of=/dev/virtualmachines/f11-pv-hpc-node0006
# VM 7: Fedora 11 x86_64 PV domU (MPICH2 Virtual Supercomputer Center)
###############################################################################################################
zcat $SOURCE/virtualmachines-f11-pv-hpc-node0007.img.gz | dd
of=/dev/virtualmachines/f11-pv-hpc-node0007
# VM 8: Fedora 11 x86_64 PV domU (MPICH2 Virtual Supercomputer Center)
###############################################################################################################
zcat $SOURCE/virtualmachines-f11-pv-hpc-node0008.img.gz | dd
of=/dev/virtualmachines/f11-pv-hpc-node0008
# VM 9: FreeBSD 8.0 RC2 UNIX amd64 HVM domU
###############################################################################################################
zcat $SOURCE/virtualmachines-freebsd.img.gz | dd
of=/dev/virtualmachines/freebsd
# VM 10: OpenSolaris 2009.06 UNIX amd64 PV domU
###############################################################################################################
zcat $SOURCE/virtualmachines-opensolaris.img.gz | dd
of=/dev/virtualmachines/opensolaris
# VM 11: Rocks 5.1 x86_64 HPC Compute Cluster HVM domU (based on CentOS 5.2)
###############################################################################################################
# Add partition mappings in /dev/mapper
kpartx -av /dev/virtualmachines/rocks0001
# Restore MBR
dd if=$SOURCE/virtualmachines-rocks0001.mbr
of=/dev/virtualmachines/rocks0001 bs=512 count=1
# Restore partition geometry
sfdisk /dev/virtualmachines/rocks0001 <
$SOURCE/virtualmachines-rocks0001.sfdisk
# Restore all filesystems
partimage -e -b restore /dev/mapper/virtualmachines-rocks0001p1
$SOURCE/virtualmachines-rocks0001p1.img.000
partimage -e -b restore /dev/mapper/virtualmachines-rocks0001p2
$SOURCE/virtualmachines-rocks0001p2.img.000
partimage -e -b restore /dev/mapper/virtualmachines-rocks0001p5
$SOURCE/virtualmachines-rocks0001p5.img.000
# Delete partition mappings in /dev/mapper
kpartx -dv /dev/virtualmachines/rocks0001
# VM 12: Rocks 5.1 x86_64 HPC Compute Cluster HVM domU (based on CentOS 5.2)
###############################################################################################################
# Add partition mappings in /dev/mapper
kpartx -av /dev/virtualmachines/rocks0002
# Restore MBR
dd if=$SOURCE/virtualmachines-rocks0002.mbr
of=/dev/virtualmachines/rocks0002 bs=512 count=1
# Restore partition geometry
sfdisk /dev/virtualmachines/rocks0002 <
$SOURCE/virtualmachines-rocks0002.sfdisk
# Restore all filesystems
partimage -e -b restore /dev/mapper/virtualmachines-rocks0002p1
$SOURCE/virtualmachines-rocks0002p1.img.000
partimage -e -b restore /dev/mapper/virtualmachines-rocks0002p2
$SOURCE/virtualmachines-rocks0002p2.img.000
partimage -e -b restore /dev/mapper/virtualmachines-rocks0002p5
$SOURCE/virtualmachines-rocks0002p5.img.000
# Delete partition mappings in /dev/mapper
kpartx -dv /dev/virtualmachines/rocks0002
# VM 13: Rocks 5.1 x86_64 HPC Compute Cluster HVM domU (based on CentOS 5.2)
###############################################################################################################
# Add partition mappings in /dev/mapper
kpartx -av /dev/virtualmachines/rocks0003
# Restore MBR
dd if=$SOURCE/virtualmachines-rocks0003.mbr
of=/dev/virtualmachines/rocks0003 bs=512 count=1
# Restore partition geometry
sfdisk /dev/virtualmachines/rocks0003 <
$SOURCE/virtualmachines-rocks0003.sfdisk
# Restore all filesystems
partimage -e -b restore /dev/mapper/virtualmachines-rocks0003p1
$SOURCE/virtualmachines-rocks0003p1.img.000
partimage -e -b restore /dev/mapper/virtualmachines-rocks0003p2
$SOURCE/virtualmachines-rocks0003p2.img.000
partimage -e -b restore /dev/mapper/virtualmachines-rocks0003p5
$SOURCE/virtualmachines-rocks0003p5.img.000
# Delete partition mappings in /dev/mapper
kpartx -dv /dev/virtualmachines/rocks0003
# VM 14: Rocks 5.1 x86_64 HPC Compute Cluster HVM domU (based on CentOS 5.2)
###############################################################################################################
# Add partition mappings in /dev/mapper
kpartx -av /dev/virtualmachines/rocks0004
# Restore MBR
dd if=$SOURCE/virtualmachines-rocks0004.mbr
of=/dev/virtualmachines/rocks0004 bs=512 count=1
# Restore partition geometry
sfdisk /dev/virtualmachines/rocks0004 <
$SOURCE/virtualmachines-rocks0004.sfdisk
# Restore all filesystems
partimage -e -b restore /dev/mapper/virtualmachines-rocks0004p1
$SOURCE/virtualmachines-rocks0004p1.img.000
partimage -e -b restore /dev/mapper/virtualmachines-rocks0004p2
$SOURCE/virtualmachines-rocks0004p2.img.000
partimage -e -b restore /dev/mapper/virtualmachines-rocks0004p5
$SOURCE/virtualmachines-rocks0004p5.img.000
# Delete partition mappings in /dev/mapper
kpartx -dv /dev/virtualmachines/rocks0004
# VM 15: Rocks 5.1 x86_64 HPC Compute Cluster HVM domU (based on CentOS 5.2)
###############################################################################################################
# Add partition mappings in /dev/mapper
kpartx -av /dev/virtualmachines/rocks0005
# Restore MBR
dd if=$SOURCE/virtualmachines-rocks0005.mbr
of=/dev/virtualmachines/rocks0005 bs=512 count=1
# Restore partition geometry
sfdisk /dev/virtualmachines/rocks0005 <
$SOURCE/virtualmachines-rocks0005.sfdisk
# Restore all filesystems
partimage -e -b restore /dev/mapper/virtualmachines-rocks0005p1
$SOURCE/virtualmachines-rocks0005p1.img.000
partimage -e -b restore /dev/mapper/virtualmachines-rocks0005p2
$SOURCE/virtualmachines-rocks0005p2.img.000
partimage -e -b restore /dev/mapper/virtualmachines-rocks0005p5
$SOURCE/virtualmachines-rocks0005p5.img.000
# Delete partition mappings in /dev/mapper
kpartx -dv /dev/virtualmachines/rocks0005
# VM 16: Slackware64 13.0 amd64 HVM domU
###############################################################################################################
# Add partition mappings in /dev/mapper
kpartx -av /dev/virtualmachines/slackware64
# Restore MBR
dd if=$SOURCE/virtualmachines-slackware64.mbr
of=/dev/virtualmachines/slackware64 bs=512 count=1
# Restore partition geometry
sfdisk /dev/virtualmachines/slackware64 <
$SOURCE/virtualmachines-slackware64.sfdisk
# Restore all filesystems
partimage -e -b restore /dev/mapper/virtualmachines-slackware64p1
$SOURCE/virtualmachines-slackware64p1.img.000
partimage -e -b restore /dev/mapper/virtualmachines-slackware64p2
$SOURCE/virtualmachines-slackware64p2.img.000
# Delete partition mappings in /dev/mapper
kpartx -dv /dev/virtualmachines/slackware64
# VM 17: Ubuntu 9.10 Karmic Koala Linux HVM domU
###############################################################################################################
# Add partition mappings in /dev/mapper
kpartx -av /dev/virtualmachines/ubuntu910
# Restore MBR
dd if=$SOURCE/virtualmachines-ubuntu910.mbr
of=/dev/virtualmachines/ubuntu910 bs=512 count=1
# Restore partition geometry
sfdisk /dev/virtualmachines/ubuntu910 <
$SOURCE/virtualmachines-ubuntu910.sfdisk
# Restore all filesystems
partimage -e -b restore /dev/mapper/virtualmachines-ubuntu910p1
$SOURCE/virtualmachines-ubuntu910p1.img.000
# Delete partition mappings in /dev/mapper
kpartx -dv /dev/virtualmachines/ubuntu910
# VM 18: Windows XP Home Edition SP3 32-bit HVM domU with VGA passthrough
(requires Intel VT-d)
###############################################################################################################
# Add partition mappings in /dev/mapper
kpartx -av /dev/virtualmachines/winxphome32
# Restore MBR
dd if=$SOURCE/virtualmachines-winxphome32.mbr
of=/dev/virtualmachines/winxphome32 bs=512 count=1
# Restore partition geometry
sfdisk /dev/virtualmachines/winxphome32 <
$SOURCE/virtualmachines-winxphome32.sfdisk
# Restore all filesystems
partimage -e -b restore /dev/mapper/virtualmachines-winxphome32p1
$SOURCE/virtualmachines-winxphome32p1.img.000
# Delete partition mappings in /dev/mapper
kpartx -dv /dev/virtualmachines/winxphome32
###############################################################################################################
###############################################################################################################
# Deactivate Logical Volume Manager
vgchange -an
# Sync filesystems
sync
# Reboot the machine
reboot
###############################################################################################################
# EOF
###############################################################################################################
</SCRIPT>
--
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe at gmail.com
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore
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