KVM Hot Online Virtual Machines Backup with Bacula bpipe

KVM Hot Online Virtual Machines Backup with Bacula bpipe

This script aims to backup QEMU/KVM/libVirt virtual machines. It requires KVM 2.1+ since it uses the live blockcommit mode. This means the data in the snapshot disk is rolled back into the original at the end of the backup.

Bpipe Script

#
# FileSet Include (bacula-dir.conf)  
#
#    Plugin = "\|/etc/bacula/kvm_bpipe.sh"
#
#
DOMAIN=`virsh list --all | tail -n -2 | head -n -1 | awk '{print $2}'`

for d in $DOMAIN; do

  TARGETS=`virsh domblklist "$DOMAIN" --details | grep ^file | grep -v cdrom | awk '{print $3}'`
  IMAGES=`virsh domblklist "$DOMAIN" --details | grep ^file | awk '{print $4}'`

  for t in $TARGETS; do
    virsh snapshot-create-as --domain $DOMAIN --name backup --no-metadata -atomic --disk-only --diskspec $t,snapshot=external >/dev/null
  done

  for t in $IMAGES; do
    NAME=`basename "$t"`
    echo "bpipe:/mnt/$NAME.bkp:cat $t:dd of=/tmp/$NAME.bkp"
    echo "bpipe:/mnt/$NAME.xml.bkp:virsh dumpxml $DOMAIN:dd/tmp/$NAME.xml.bkp"
  done
done

ClientRunAfterJob Script

#
# KVM Backup Job (bacula-dir.conf)
#
#    ClientRunAfterJob = "/etc/bacula/kvm_commit.sh"
#

DOMAIN=`virsh list --all | tail -n -2 | head -n -1 | awk '{print $2}'`

BACKUPIMAGES=`virsh domblklist "$DOMAIN" --details | grep ^file | awk '{print $4}'`
for t in $TARGETS; do
    virsh blockcommit "$DOMAIN" "$t" --active --pivot >/dev/null
    if [ $? -ne 0 ]; then
        echo "Could not merge changes for disk $t of $DOMAIN. VM may be in invalid state."
        exit 1
    fi
done

Source

https://gist.github.com/cabal95/e36c06e716d3328b512b

Disponível em: pt-brPortuguês (Portuguese (Brazil))enEnglishesEspañol (Spanish)

This Post Has 6 Comments

  1. Steve 24 Sep 2020 Reply

    I am trying to use this but am getting:
    Fatal error: Error running program: /opt/bacula/scripts/kvm_bpipe.sh. ERR=Child exited with code 2
    Not sure how to debug it

    1. hfaria 25 Sep 2020 Reply

      Hello Steve,

      It looks like you didn’t create the client script in the correct path.

      Regards,

  2. Steve 29 Sep 2020 Reply

    I figured that part out. How do you backup KVM guests on other hosts to backup, I am getting failed to connect to hypervisor. I have all the certificates in place and virsh -c qemu+tls:// host/system works from the bacula server
    Thanks,
    Steve

  3. Steve 29 Sep 2020 Reply

    *How do you backup KVM guests on other hosts to bacula*

  4. Steve 30 Sep 2020 Reply

    fd_plugins.c:606 Command plugin “error: failed to connect to the hypervisor” not found.

  5. Steve 7 Oct 2020 Reply

    Is this script meant to backup a remote LVM host or local, I am not able to get the remote system to backup. A little more documentation would be great

Leave a Reply