Le lundi 19 octobre 2009 à 14:36 +0100, Tyler J. Wagner a écrit :
> Very handy, Daniel, thank you.
>
> Why do it this way? That is, why not back up the VMs like any other server?
I do both. Backup the VM at the file system level, like any other real
server, but I also backup the VM at the block device level, because it
provides a very easy/fast disaster recovery mecanism. If the --state
flag is present, I can restore the guest in the exact state it was when
the backup was made (including running programs, opened files etc...).
Without the --state flag, I can restore it, just as if the guest had
crashed (power failure).
Regards
>
> Regards,
> Tyler
>
> On Monday 19 October 2009 14:02:58 Daniel Berteaud wrote:
> > Hi everyone.
> >
> > I've written a script to backup virtual machines managed by libvirt
> > (only tested with KVM guests, but should works for Xen too, maybe others
> > as well).
> >
> > It's called virt-backup.pl
> >
> > I've written it for integration with BackupPC:
> > - take a dump of a VM in using the pre-backup facility
> > - backup the dumps using BackupPC
> > - cleanup the dumps in the post-backup phase
> >
> > This script can be used outside of BackupPC as it's quite generic.
> >
> > There are two main mode for this script:
> > --pre: take the backup of the VM. This is called --pre because I use it
> > as a pre-backup script for BackupPC
> > --post: cleanup the dumps
> >
> > Here're some functionalities:
> >
> > - no configuration file needed, everything can be passed as command line
> > arg
> > - can take snapshots of virtual disks if they are on LVM Logical volume
> > (the default is to try LVM in any case, if it's not possible, then, just
> > dump the block device/file)
> > - Supports backup of running VM with minimal downtime (if each virtual
> > disks can be snapshoted, just resume the VM immediately resulting in
> > just a few seconds of downtime, then, dump the snapshots. If snapshots
> > are not available, the guest is suspended during the dump)
> > - can save the state of running vm (equivalent of virsh save/virsh
> > restore). This is optional because it's still not very reliable, and
> > sometimes the restoration fails, leaving a crashed qemu process running
> > and eating CPU cycles.
> > - Can compress on-the-fly the virtual disks dumps
> > (gzip,bzip2,pbzip2,lzop,xz)
> > - Support virtual disks exclusions (if you want to backup the system
> > disk of a VM, but not the data one for example)
> > - Can work on installations where virtual disks are stored on one hosts,
> > and guests runs on another on (NFS, iscsi etc... in any case, the script
> > must be run on the host which holds the virtual disks)
> > - Can backup as many guests as you want in one run (they'll be dumped
> > sequentially)
> > - Backups are run with low priority (nice and ionice), so it should'nt
> > slow down too much your system.
> >
> > Here are the dependencies for this script to work
> > - Sys::Virt perl module
> > - XML::Simple per module
> > - Getopt::Long perl module
> > - lvm2
> > - gzip (optional)
> > - bzip2 (optional)
> > - pbzip2 (optional)
> > - lzop (optional)
> > - xz (optional)
> >
> > You can run this script without argument to see the help. Edit it if you
> > want more informations (there are some examples on how to use it at the
> > beginning of the script).
> >
> >
> > The script can be found here:
> >
> > http://repo.firewall-services.com/misc/virt-backup.pl
> >
> > Regards, Daniel
> >
>
--
Daniel Berteaud
FIREWALL-SERVICES SARL.
Société de Services en Logiciels Libres
Technopôle Montesquieu
33650 MARTILLAC
Tel : 05 56 64 15 32
Fax : 05 56 64 15 32
Mail: daniel AT firewall-services DOT com
Web : http://www.firewall-services.com
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