Simple Backup (LVM + rsync)

backup.sh

#!/bin/bash
# Original Source:
# https://gist.github.com/ggrandes/72c2c1f41d28664cff2d73a5ad5c5d05
#
# Sample Execution:
#  nohup ./backup.sh vg1 root "--delete" 1>backup.log 2>&1 & tail -f backup.log
# Sample Params:
#  vg1 root "--delete"
#  vg1 kvm
LVM_VG="$1"
LVM_LV_SRC="$2"
OPTS="$3"
#
LVM_LV_SNAP="${LVM_LV_SRC}.SNAP"
SRC_PART="/dev/$LVM_VG/$LVM_LV_SRC"
SNAP_PART="/dev/$LVM_VG/$LVM_LV_SNAP"
SNAP_DIR="/tmp/backups/src/$LVM_LV_SRC/"
BACKUP_DIR="/mnt/backups/${HOSTNAME}/$LVM_LV_SRC/"
LOCK_FILE="/var/lock/backup.lock"
#
do_backup () {
  [ "$UID" = "0" ] || {
    echo "ERROR: You must be root"
    exit 1;
  }
  [ ! -b "$SRC_PART" ] && {
    echo "ERROR: $SRC_PART not exist"
    exit 1;
  }
  [ -b "$SNAP_PART" ] && {
    echo "### Destroy $SNAP_PART"
    umount $SNAP_PART
    lvremove -f $SNAP_PART < /dev/null
  }
  [ ! -d "$SNAP_DIR" ] && {
    echo "### Create $SNAP_DIR"
    mkdir -pm700 $SNAP_DIR
  }
  [ ! -d "$BACKUP_DIR" ] && {
    echo "### Create $BACKUP_DIR"
    mkdir -pm700 $BACKUP_DIR
  }
  echo "### BEGIN: $(date +'%Y-%m-%d %H:%M:%S')"
  echo "### Syncing"
  sync
  echo "### Create $SNAP_PART"
  lvcreate --snapshot "$SRC_PART" --name $LVM_LV_SNAP --permission r --extents "50%FREE" < /dev/null
  echo "### Mount $SNAP_PART"
  mount $SNAP_PART $SNAP_DIR -o ro
  echo "### Listing $SNAP_DIR $BACKUP_DIR"
  ls -al $SNAP_DIR $BACKUP_DIR
  echo "### Backup $SNAP_PART to $BACKUP_DIR"
  rsync -HAXvax --numeric-ids --inplace --preallocate $OPTS "$SNAP_DIR" "$BACKUP_DIR"
  echo "### Unmount $SNAP_PART"
  umount $SNAP_PART
  echo "### Destroy $SNAP_PART"
  lvremove -f $SNAP_PART < /dev/null
  echo "### Syncing"
  sync
  echo "### END: $(date +'%Y-%m-%d %H:%M:%S')"
}
(
  flock -n 9 || { echo ERROR: Unable to lock, another backup is running?; exit 1; }
  do_backup
) 9>$LOCK_FILE

dobackup.sh

#!/bin/bash
# /etc/fstab
# UUID=XX /mnt/backups ext4 noatime,noauto 0 0
#
[ "$UID" = "0" ] || {
  echo "You need root"
  exit 1
}
cd /mnt/backups
[ -x ./scripts/backup.sh ] || {
  echo "Incorrect path"
  exit 1
}
touch backup.log
case "$1" in
  forked)
    ./scripts/backup.sh vg1 root "--delete"
    ./scripts/backup.sh vg1 kvm "--delete"
  ;;
  start)
    nohup $0 forked 1>backup.log 2>&1 < /dev/null &
  ;;
  tail)
    tail -f backup.log
  ;;
  *)
    echo "$0 <start|tail>"
  ;;
esac