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## destroy outdated snapshot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