最後更新: 2015-04-09

btrfs-snapshot-rotation

btrfs-snapshot: Take and rotate snapshots on a btrfs file system

Program: bash

HomePage: https://github.com/mmehnert/btrfs-snapshot-rotation

原理:

# Clean up older snapshots:
for i in `ls $TARGET|sort |grep @${SNAP}|head -n -${max_snap}`; do
    cmd="btrfs subvolume delete   $TARGET/$i"
    if [ -z $QUIET ]; then
        echo $cmd
    fi
    $cmd >/dev/null
done

# Create new snapshot:
cmd="btrfs subvolume snapshot -r $SOURCE $TARGET/`date "+%F--%H-%M-%S-@${SNAP}"`"
if [ -z $QUIET ]; then
    echo $cmd
fi
$cmd >/dev/null

Usage

btrfs-snapshot source target snap_name count [-q]

source:          Path to make snapshot of
target:           Snapshot directory
snap_name:   Base name for snapshots, to be appended to date "+%F--%H-%M-%S"
count:            Number of snapshots in the timestamp-@snap_name format to (keep at one time for a given snap_name.)
[-q]:              Be quiet.

準備

mount -t btrfs /dev/xxx /backup

cd /backup

btrfs sub create sync_root

mkdir backup_root

crontab

# 對 sync_root 建立 readonly snapshot 並 mount 到 backup_root

btrfs-snapshot /backup/sync_root /backup/backup_root daily 14 -q

path store

2015-04-09--11-52-50-@daily
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2015-04-09--11-53-01-@daily
2015-04-09--11-53-02-@daily
2015-04-09--11-53-03-@daily
2015-04-09--11-53-04-@daily
2015-04-09--11-53-05-@daily
2015-04-09--11-53-19-@daily
2015-04-09--11-53-33-@daily
2015-04-09--11-53-46-@daily
2015-04-09--11-53-56-@daily
2015-04-09--11-55-03-@daily