Create the best ghetto backup script of september 2016
This commit is contained in:
Orien Vandenbergh
parent
e51bffd7f2
commit
5a027aaf9e
180
ghetto/backup/create_diskimage.sh
Executable file
180
ghetto/backup/create_diskimage.sh
Executable file
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#!/bin/bash
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shopt -s extglob
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PARANOIA_DELAY=30
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PARANOIA_SEQ=`echo "$PARANOIA_DELAY - 1" | bc`
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HOSTNAME="$1"
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TARGET="$2"
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DEST=$TARGET/$HOSTNAME
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FS="ext2 ext3 ext4 reiserfs reiser4 xfs jfs btrfs ntfs"
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nltos() {
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sed -e ':a;N;$!ba;s/\n/ /g'
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}
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display_syntax() {
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echo "Syntax: create_diskimage.sh <hostname> <target>"
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echo ""
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echo "<hostname> is the name of the host you are creating the image for"
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echo "<target> is the directory into which the backup should be created"
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echo " backups are placed into \$target/\$hostname/ (created as needed)"
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echo ""
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exit 2
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}
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if [[ $EUID -ne 0 ]]; then
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echo "This script must be run as root, figure out a way to make that work..."
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exit 5
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fi
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if [ -z "$HOSTNAME" ]; then
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echo "No hostname specified"
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display_syntax
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fi
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if [ -z "$TARGET" ]; then
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echo "No target directory specified"
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display_syntax
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fi
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if [ ! -d $TARGET ]; then
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echo "Target directory doesn't exist"
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display_syntax
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fi
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if [ -d $DEST ]; then
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echo "Backup directory '$DEST' already exists, please remove before running again..."
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exit -1
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fi
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DISKGUESS=`(cd /dev/; ls [shv]d[a-z]* | grep -v '[0-9]') | nltos`
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PARTGUESSRAW=`lsblk -nl | grep -v 'dm' | awk '$6 == "part" { print $1 }' | nltos`
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PVS=`vgs -o +pv_name --noheadings | awk '{print $NF}' | nltos | sed -e 's/\/dev\///g'`
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VGS=`vgs --noheadings | awk '{print $1}'`
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LVS=`find /dev/mapper -type l | grep -v swap | nltos`
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PARTGUESSFS=$PARTGUESSRAW
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for pv in $PVS; do
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PARTGUESSFS=${PARTGUESSFS//$pv?()}
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done
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for part in $PARTGUESSFS; do
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TYPE=""
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eval $(blkid /dev/$part | awk ' { print $3 } ')
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if [[ $FS == *"$TYPE"* ]] && [ -n "$TYPE" ]; then
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PARTGUESS="$PARTGUESS $part"
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fi
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done
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PARTGUESS=`echo $PARTGUESS | xargs`
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printf "Which disks [$DISKGUESS]: "
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read DISKS
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echo
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echo "Now we need a list of \"raw\" partitions to back up. The utility we're using"
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echo "'fsarchiver' doesn't support backing up swap (for good reason). If you"
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echo "specify a swap partition here, the backup will fail. In addition, we detect"
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echo "the LVM partitions automatically, so only specify the non-lvm, non-swap"
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echo "partitions. Generally this is only the device for /boot (normally sda1)"
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echo ""
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printf "Which non-lvm partitions [$PARTGUESS]: "
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read PARTS
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echo
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if [ -z "$DISKS" ]; then
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DISKS=$DISKGUESS
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if [ -z "$DISKS" ]; then
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echo "No source disks specified"
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display_syntax
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fi
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fi
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if [ -z "$PARTS" ]; then
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PARTS=$PARTGUESS
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if [ -z "$PARTS" ]; then
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echo "No source partitions specified"
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display_syntax
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fi
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fi
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echo "Performing a backup of the following to the directory '$DEST':"
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echo " Disks: $DISKS"
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echo " Partitions: $PARTS"
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echo " Volume Groups: $VGS"
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echo " Logical Volumes: $LVS"
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echo ""
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echo ""
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echo "We're about to do work, your warranty is about to expire..."
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printf "$PARANOIA_DELAY seconds..."
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for i in `seq $PARANOIA_SEQ -1 0`; do
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sleep 1
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printf "\r$i seconds... \b"
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done
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echo -e "\rexpired! "
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echo ""
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echo "-- [$DEST] Creating directory"
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mkdir $DEST
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echo ""
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for disk in $DISKS; do
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echo "-- [$disk] Backing up MBR"
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dd if=/dev/$disk of=$DEST/$disk.mbr bs=512 count=1
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echo "-- [$disk] Backing up partition layout"
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sfdisk -d /dev/$disk > $DEST/$disk.part
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done
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echo ""
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for vg in $VGS; do
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echo "-- [$vg] Backing up LVM layout..."
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vgcfgbackup -f $DEST/$vg.vgcfg $vg
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done
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echo ""
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echo "-- Starting fsarchiver, this will take some time..."
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LABEL=`date +"$HOSTNAME-%Y%m%d%H%M%S-backup"`
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FULLPARTS=`echo $PARTS | sed 's/[^ ]* */\/dev\/&/g'`
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fsarchiver savefs -j4 -L "$LABEL" -o $DEST/fsarchive.fsa $FULLPARTS $LVS
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echo "-- Recording data to make a restore easier..."
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echo "exit # Ha, you thought i was gonna make this easy?" > $DEST/restore.sh
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echo "DEST=$DEST" >> $DEST/restore.sh
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for disk in $DISKS; do
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echo "sfdisk /dev/$disk < \$DEST/$disk.part" >> $DEST/restore.sh
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echo "dd if=\$DEST/$disk.mbr of=/dev/$disk.mbr bs=512 count=1" >> $DEST/restore.sh
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done
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for vg in $VGS; do
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pv=`vgs -o +pv_name --noheadings $vg | awk '{print $NF}'`
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uuid=`pvs -o +uuid --noheadings $pv | awk '{print $NF}'`
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echo "pvcreate --uuid $uuid --restorefile \$DEST/$vg.vgcfg $pv" >> $DEST/restore.sh
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echo "vgcfgrestore -f \$DEST/$vg.vgcfg $vg" >> $DEST/restore.sh
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echo "vgchange -a y $vg" >> $DEST/restore.sh
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done
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id=0
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RESTOREFLAGS=""
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for fs in $FULLPARTS $LVS; do
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RESTOREFLAGS="$RESTOREFLAGS id=$id,dest=$fs"
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id=`echo "$id + 1" | bc`
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done
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echo "fsarchiver restfs $RESTOREFLAGS" >> $DEST/restore.sh
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echo "" >> $DEST/restore.sh
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echo "# Now for the hard part, I know you can do it!" >> $DEST/restore.sh
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echo "# mount /dev/mapper/<system-root> /mnt/backup" >> $DEST/restore.sh
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echo "# mount -o bind /dev /mnt/backup/dev" >> $DEST/restore.sh
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echo "# mount <system-boot> /mnt/backup/boot" >> $DEST/restore.sh
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echo "# chroot /mnt/backup /bin/bash" >> $DEST/restore.sh
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echo "# grub-install <boot-device (/dev/sda)>" >> $DEST/restore.sh
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echo "# exit" >> $DEST/restore.sh
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echo "# umount /mnt/backup/boot" >> $DEST/restore.sh
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echo "# umount /mnt/backup/dev" >> $DEST/restore.sh
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echo "# umount /mnt/backup" >> $DEST/restore.sh
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echo "#" >> $DEST/restore.sh
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echo "# The good news is you're done. umount the partition the backups live" >> $DEST/restore.sh
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echo "# on, repeat the team mantra, and reboot" >> $DEST/restore.sh
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echo ""
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echo ""
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echo "All done, to view contents, run: 'fsarchiver archinfo $DEST/fsarchive.fsa'"
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exit 0
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