159 lines
4.4 KiB
Bash
159 lines
4.4 KiB
Bash
#!/bin/bash
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helpFunction()
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{
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echo ""
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echo "Usage: $0 -v VmName -t TargetHost -d TargetDataset -l LIMIT"
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echo -e "\t-v Name of the vm to backup"
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echo -e "\t-t Backup target host name"
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echo -e "\t-s VM source zfs dataset"
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echo -e "\t-d Backup target zfs dataset"
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echo -e "\t-l Limit Bandwith"
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exit 1 # Exit script after printing help
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}
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while getopts "v:t:s:d:l:" opt
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do
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case "$opt" in
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v ) VM="$OPTARG" ;;
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t ) DESTHOST="$OPTARG" ;;
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s ) SRCZFS="$OPTARG" ;;
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d ) DESTZFS="$OPTARG" ;;
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l ) LIMIT="$OPTARG" ;;
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? ) helpFunction ;; # Print helpFunction in case parameter is non-existent
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esac
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done
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# Print helpFunction in case parameters are empty
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if [ -z "$VM" ] || [ -z "$DESTHOST" ] || [ -z "$DESTZFS" ] || [ -z "$SRCZFS" ] || [ -z "$LIMIT" ]
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then
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echo "Some or all of the parameters are empty";
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helpFunction
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fi
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echo "$(date +%Y-%m-%d_%H:%M:%S): Starting Backup of $VM"
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DAYS=$(zfs get backup:days -H -o value $SRCZFS)
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if [[ $DAYS == "-" ]]
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then
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DAYS=7
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fi
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echo "$(date +%Y-%m-%d_%H:%M:%S): Keeping backups for $DAYS days"
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DAYS=$(($DAYS + 1))
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DATE=$(date "+%Y%m%d%H%M")
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DATEOLD=$(date -d -"$DAYS"day "+%Y%m%d")
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SNAPNAME="backup_$DATE"
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abortFunction()
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{
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zfs set backup:success="false" $SRCZFS
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zfs set backup:failed="$DATE" $SRCZFS
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exit 1
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}
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VMDISKS=$(virsh domblklist $VM | grep qcow2 | egrep -o [vs]d.)
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DISKSPEC=""
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for disk in $VMDISKS
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do
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DISKSPEC+="--diskspec $disk,file=/srv/snapshots/$VM/$VM-$disk-$SNAPNAME.qcow2,snapshot=external "
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done
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# create snapshot dataset
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zfs create tank/snapshots/$VM
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# create virsh xml-dump of vm
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virsh dumpxml $VM > /srv/vms/$VM/vm-$VM.xml
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echo "$(date +%Y-%m-%d_%H:%M:%S): Create VM snapshot of $VM"
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virsh snapshot-create-as --domain $VM --name $SNAPNAME --quiesce --atomic --disk-only $DISKSPEC >/dev/null 2>&1
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if [ $? -ne 0 ]
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then
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virsh snapshot-create-as --domain $VM --name $SNAPNAME --disk-only $DISKSPEC >/dev/null 2>&1
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if [ $? -ne 0 ]
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then
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echo "VM snapshot creation failed" >&2
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abortFunction
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else
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echo "$(date +%Y-%m-%d_%H:%M:%S): Snapshot created without --quiesce"
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fi
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fi
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echo "$(date +%Y-%m-%d_%H:%M:%S): Creating ZFS snapshot $SRCZFS@$SNAPNAME"
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zfs snapshot "$SRCZFS"@"$SNAPNAME"
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if [ $? -ne 0 ]
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then
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echo "ZFS snapshot creation failed" >&2
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abortFunction
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fi
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echo "$(date +%Y-%m-%d_%H:%M:%S): Deleting vm disk snapshots"
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for disk in $VMDISKS
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do
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virsh blockcommit $VM $disk --pivot --active >/dev/null
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done
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VMDISKS=$(virsh domblklist $VM | egrep [vs]d.)
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for disk in $VMDISKS
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do
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if [[ $disk == *"snapshot"* ]]
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then
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echo "Snapshot deletion failed for $disk" >&2
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abortFunction
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fi
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done
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virsh snapshot-delete $VM $SNAPNAME --metadata > /dev/null
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SUCCESS=$(zfs get backup:success -H -o value $SRCZFS)
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LASTBACKUP=$(zfs get backup:date -H -o value $SRCZFS)
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if [[ $SUCCESS == "true" ]]
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then
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LASTSNAP="backup_$LASTBACKUP"
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echo "$(date +%Y-%m-%d_%H:%M:%S): Sending incremental snapshot from $LASTSNAP"
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ssh $DESTHOST sudo zfs rollback "$DESTZFS"@"$LASTSNAP"
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zfs send -R -i "$SRCZFS"@"$LASTSNAP" "$SRCZFS"@"$SNAPNAME" | pv -L $LIMIT | ssh $DESTHOST sudo zfs recv $DESTZFS
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else
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if [[ $LASTBACKUP != "-" ]]
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then
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LASTSNAP="backup_$LASTBACKUP"
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echo "$(date +%Y-%m-%d_%H:%M:%S): Trying to send incremental snapshot from $LASTSNAP"
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ssh $DESTHOST sudo zfs rollback "$DESTZFS"@"$LASTSNAP"
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zfs send -R -i "$SRCZFS"@"$LASTSNAP" "$SRCZFS"@"$SNAPNAME" | pv -L $LIMIT | ssh $DESTHOST sudo zfs recv $DESTZFS
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else
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echo "$(date +%Y-%m-%d_%H:%M:%S): Sending full snapshot"
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zfs send -R "$SRCZFS"@"$SNAPNAME" | pv -L $LIMIT | ssh $DESTHOST sudo zfs recv -F $DESTZFS
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fi
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fi
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if [ $? -eq 0 ]
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then
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zfs set backup:success="true" $SRCZFS
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zfs set backup:date="$DATE" $SRCZFS
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zfs set backup:failed="-" $SRCZFS
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if [ -n $LASTSNAP ]
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then
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echo "$(date +%Y-%m-%d_%H:%M:%S): Deleting old ZFS snapshot $LASTSNAP"
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zfs destroy "$SRCZFS"@"$LASTSNAP"
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fi
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else
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abortFunction
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fi
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zfs destroy tank/snapshots/$VM
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# cleanup old backups
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OLDSNAPS=$(ssh $DESTHOST zfs list -r -t snapshot -o name $DESTZFS 2>/dev/null | grep $DATEOLD)
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if [ ${#OLDSNAPS} -gt 0 ]
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then
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for oldsnap in $OLDSNAPS
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do
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echo "$(date +%Y-%m-%d_%H:%M:%S): Deleting old snapshots on target"
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ssh $DESTHOST sudo zfs destroy $oldsnap
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done
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else
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echo "$(date +%Y-%m-%d_%H:%M:%S): No old snapshots to cleanup on target"
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fi
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echo "$(date +%Y-%m-%d_%H:%M:%S): Backup Completed"
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