olavmrk · December 11, 2013 13:24 · Dec 11, 2013
diff --git a/lvm-daily-snapshot.sh b/lvm-daily-snapshot.sh
@@ -0,0 +1,43 @@
+#!/bin/bash
+
+KEEP_DAYS=15
+VG="vg" # LVM volume group we are snapshoting
+LV="data-volume-name" # Name of LVM-volume to take a snapshot of
+BACKUP_PREFIX="backup-volume-prefix-" # Prefix of snapshot volume name.
+SIZE=40G # Amount of disk space to allocate for the snapshot
+
+
+# Create new snapshot
+TODAY="$(date +%F)" 
+NEW_VOLUME="$BACKUP_PREFIX$TODAY" 
+if ! lvs | grep -q -F "$NEW_VOLUME"; then
+    /sbin/lvcreate --size $SIZE --permission r --snapshot "$VG/$LV" --name "$NEW_VOLUME" 
+else
+    echo "Backup already exists: $NEW_VOLUME" 
+fi
+
+# Clean old snapshots.
+
+# We need to work around debian bug #659762
+# See: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=659762
+# We do that by disabling udev while removing snapshots
+if service udev status >/dev/null 2>&1; then
+    UDEV_RUNNING=1
+    service udev stop >/dev/null 2>&1
+else
+    UDEV_RUNNING=0
+fi
+
+lvs -o lv_name --noheadings | sed -n "s@$BACKUP_PREFIX@@p" | while read DATE; do
+    TS_DATE=$(date -d "$DATE" +%s)
+    TS_NOW=$(date +%s)
+    AGE=$(( (TS_NOW - TS_DATE) / 86400))
+    if [ "$AGE" -ge "$KEEP_DAYS" ]; then
+        VOLNAME="$BACKUP_PREFIX$DATE" 
+        /sbin/lvremove -f "$VG/$VOLNAME" 
+    fi
+done
+
+if [ "$UDEV_RUNNING" = "1" ]; then
+    service udev start >/dev/null 2>&1
+fi