Linux/Backup

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DD

Backup

  • simple backup to image file
dd if=/dev/sda | gzip > image.dd.gz
  • gzip image without dd
gzip -c < /dev/hda1 > /tmp/partition_image.gz
  • bootloader
dd if=/dev/sda of=bootloader.img bs=446 count=1
  • MBR + partitiontable
fdisk -lu
dd if=/dev/sda of=mbr.img bs=512? count=1? 63?

Backup over network

  • Target
netcat -l 5555 | dd of=image.dd.gz


  • Source
dd if=/dev/sda | pv | pigz --best | netcat $TargetIP 5555

Status

  • dd status
while /bin/true; do sleep 5; kill -USR1 `pidof dd`; done
or
watch -n N kill -USR1 `pidof dd` 
  • pv
dd if=/dev/sda | pv | dd of=image.dd

pv -s 60G    -> for estimate

Loop

  • mount image as loop
mkdir /mnt/loop
mount -o loop image.dd /mnt/loop
umount /mnt/loop

rsync

rsync -v -P -r --delete --bwlimit=10000 /mnt/vm-host_backup/05_vm-host /mnt/backup



other

  • dd random
dd if=/dev/random bs=1M count=256 | gzip >./256-MB-random-data.bin


Backup Manager

  • /backup (ln /filesystem/80_backup/10_autobackup)
  • /backup/!backupmanager
  • /backup/10_vm-host


Links