140 lines
3.9 KiB
Django/Jinja
Executable file
140 lines
3.9 KiB
Django/Jinja
Executable file
#!/bin/bash
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set -euo pipefail
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(
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set -euo pipefail
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flock -x -w 10 200 || exit 1
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export LVM_SUPPRESS_FD_WARNINGS=1
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DOMAIN=${1:?VM name musst be passed!}
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DOMAIN_MOUNTBASE="/var/backup-client/vm-mountpoint"
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function unfreeze_vm {
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virsh resume "$DOMAIN" > /dev/null || true
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}
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function delete_snapshots {
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cleanup_vmmount > /dev/null 2>&1
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for i in $DISKS; do
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extract_lvm
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SNAPSHOT="/dev/$VG/backup-$DEVICE"
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lvremove -f "$SNAPSHOT" > /dev/null 2>&1 || true
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done
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for i in $DISKS_QCOW2; do
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extract_lvm_qcow2
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SNAPSHOT="/dev/$VG/backup-$DEVICE"
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lvremove -f "$SNAPSHOT" > /dev/null 2>&1 || true
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done
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}
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function cleanup_vmmount {
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umount -l $DOMAIN_MOUNTBASE/* || true
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rmdir ${DOMAIN_MOUNTBASE:?}/* || true
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rm "$DOMAIN_MOUNTBASE/config.xml" || true
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}
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function extract_lvm {
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DISK=`echo $i | awk -F, '{print $1}'`
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DEVICE=`echo $i | awk -F, '{print $2}'`
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VG=`lvs --noheadings -o vg_name "$DISK" | tr -d ' '`
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LV=`lvs --noheadings -o lv_name "$DISK" | tr -d ' '`
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}
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function extract_lvm_qcow2 {
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DISK=`echo $i | awk -F, '{print $1}'`
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DEVICE=`echo $i | awk -F, '{print $2}'`
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DEVICEPATH=`df "$DISK" | awk '{print $1}' | tail -n1`
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MOUNTPOINT=`df "$DISK" | awk '{print $6}' | tail -n1`
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RELIMAGEPATH="${DISK#$MOUNTPOINT}"
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VG=`lvs --noheadings -o vg_name "$DEVICEPATH" | tr -d ' '`
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LV=`lvs --noheadings -o lv_name "$DEVICEPATH" | tr -d ' '`
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}
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function backup_vm {
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# get a list of disks
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DISKS=`virsh domblklist "$DOMAIN" --details \
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| sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' \
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| grep ^block \
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| grep -v swap \
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| awk '{printf "%s,%s ",$4, $3}'`
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DISKS_QCOW2=`virsh domblklist "$DOMAIN" --details \
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| sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' \
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| grep ^file \
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| grep -v swap \
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| grep '.qcow2' \
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| awk '{printf "%s,%s ",$4, $3}'`
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echo "backing up $DOMAIN: $DISKS $DISKS_QCOW2"
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trap "unfreeze_vm || true; delete_snapshots" INT TERM EXIT
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# in case an earlier script crashed we have to clear snapshots
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delete_snapshots
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# freez vm
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virsh suspend "$DOMAIN" > /dev/null || true
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# create disk snapshots
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for i in $DISKS; do
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extract_lvm
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lvcreate -L16G -s -n "backup-$DEVICE" "$DISK" > /dev/null
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done
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# create snapshots of all volumes containing qcow2 images
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for i in $DISKS_QCOW2; do
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extract_lvm_qcow2
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lvcreate -L16G -s -n "backup-$DEVICE" "$DEVICEPATH" > /dev/null
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done
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# dump vm config
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virsh dumpxml "$DOMAIN" > "$DOMAIN_MOUNTBASE/config.xml"
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unfreeze_vm
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trap "delete_snapshots" INT TERM EXIT
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# mount disks snapshots
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for i in $DISKS; do
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extract_lvm
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SNAPSHOT="/dev/$VG/backup-$DEVICE"
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fsck -y "$SNAPSHOT" > /dev/null 2> /dev/null
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(
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mkdir "$DOMAIN_MOUNTBASE/$DEVICE"
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mount -o ro "$SNAPSHOT" "$DOMAIN_MOUNTBASE/$DEVICE"
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) 2> /dev/null
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done
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# mount qcow2 disk images backing storage
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for i in $DISKS_QCOW2; do
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extract_lvm_qcow2
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SNAPSHOT="/dev/$VG/backup-$DEVICE"
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fsck -y "$SNAPSHOT" > /dev/null 2> /dev/null
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(
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mkdir "$DOMAIN_MOUNTBASE/IMAGECONTAINER_$DEVICE"
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# to be able to run fsck inside the vm we have to mount the containers r/w
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mount -o rw "$SNAPSHOT" "$DOMAIN_MOUNTBASE/IMAGECONTAINER_$DEVICE"
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mkdir "$DOMAIN_MOUNTBASE/$DEVICE"
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guestmount -m /dev/sda -a "$DOMAIN_MOUNTBASE/IMAGECONTAINER_$DEVICE/$RELIMAGEPATH" "$DOMAIN_MOUNTBASE/$DEVICE"
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) 2> /dev/null
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done
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{% if backup_backend == 'restic' %}
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# restic backend
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source /etc/backup-client/restic.env
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export RESTIC_PROGRESS_FPS=1
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restic backup \
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{{ restic_combined_flags }} \
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--verbose \
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--host "$DOMAIN" \
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--exclude-file "/etc/backup-client/vms/$DOMAIN/exclude_files" \
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--exclude="$DOMAIN_MOUNTBASE/IMAGECONTAINER_*" \
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"$DOMAIN_MOUNTBASE"
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{% endif %}
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# delete snapshot
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delete_snapshots;
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trap - INT TERM EXIT
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}
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test -f "/etc/backup-client/vms/$DOMAIN/enabled" && backup_vm || echo "Backup for $DOMAIN is disabled"
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) 200>/var/lock/backup-vm.lock
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