f99aq8ove (owner)

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gist: 58114 Download_button fork
public
Description:
zfs snapshot auto-rotation script
Public Clone URL: git://gist.github.com/58114.git
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zfs_snapshot.sh #
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#!/bin/sh
#
# zfs snapshot auto-rotation
#
#     usage: zfs_snapshot.sh <mountpoint> <snapshot name> <number of keeping snapshots> [recursive]
#
#       recursive option: Recursively create snapshot (zfs snapshot -r)
#
# for crontab
#
# @daily   /root/bin/zfs_snapshot.sh tank days_later   7  recursive
# @weekly  /root/bin/zfs_snapshot.sh tank weeks_later  5  recursive
# @monthly /root/bin/zfs_snapshot.sh tank months_later 12 recursive
# @yearly  /root/bin/zfs_snapshot.sh tank years_later  10 recursive
 
 
PATH=/sbin:$PATH
 
mountpoint=$1
snapshot_name=$2
level=$3
option=$4
 
zfs_opt=
if [ "$option" = "recursive" ]; then
    zfs_opt=-r
fi
 
## destroy outdated snapshot
zfs destroy $zfs_opt "$mountpoint@`expr $level - 1`$snapshot_name"
 
## rolling snapshot
j=`expr $level - 2`
for i in `jot - $j 0`; do
    i_plus1=`expr $i + 1`
    zfs rename $zfs_opt "$mountpoint@$i$snapshot_name" "$mountpoint@$i_plus1$snapshot_name"
done
 
## take snapshot
zfs snapshot $zfs_opt "$mountpoint@0$snapshot_name"