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btrfs snapshot automation
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| [Unit] | |
| Description=Btrfs snapshot | |
| [Service] | |
| Type=oneshot | |
| ExecStart=/usr/local/bin/do-btrfs-snapshot.sh | |
| StandardOutput=journal | |
| [Install] | |
| WantedBy=multi-user.target |
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| [Unit] | |
| Description=Daily backup of Btrfs filesystem | |
| [Timer] | |
| OnCalendar=*-*-* 05:35:00 | |
| RandomizedDelaySec=10min | |
| Persistent=true | |
| [Install] | |
| WantedBy=timers.target |
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| #!/bin/bash | |
| MOUNTPOINT=/tmp/mnt/do-snapshot | |
| mkdir -p $MOUNTPOINT | |
| DEV=`mount | grep btrfs | grep 'subvol=/arch' | awk '{print $1}'` | |
| # mount the root filesystem | |
| mount -t btrfs -o rw,noatime,compress=lzo,ssd,discard,space_cache,autodefrag $DEV $MOUNTPOINT | |
| cd $MOUNTPOINT/snapshots | |
| function create_snapshot() | |
| { | |
| name=$1 | |
| suffix=`date +%Y%m%d` | |
| if [ -d ${name}_bak_$suffix ]; then | |
| number=1 | |
| while [ -d ${name}_bak_$suffix.$number ]; do | |
| number=`expr $number + 1` | |
| done | |
| # create readonly snapshot | |
| btrfs subvolume snapshot -r ../${name}/ ${name}_bak_$suffix.$number | |
| else | |
| # create readonly snapshot | |
| btrfs subvolume snapshot -r ../${name}/ ${name}_bak_$suffix | |
| fi | |
| } | |
| function remove_snapshot() | |
| { | |
| name=$1 | |
| suffix=`date +%Y%m%d -d "31 day ago"` | |
| snapshots=`find . -maxdepth 1 -type d -name "${name}_bak_${suffix}*"` | |
| if [ $? -eq 0 ]; then | |
| for snapshot in ${snapshots}; do | |
| # delete the snapshot | |
| btrfs subvolume delete $snapshot | |
| done | |
| fi | |
| } | |
| # create arch subvol snapshot | |
| create_snapshot arch | |
| # create home subvol snapshot | |
| create_snapshot home | |
| # remove expired snapshots | |
| remove_snapshot arch | |
| remove_snapshot home | |
| cd /tmp | |
| umount $MOUNTPOINT |
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systemd files goes to
/usr/lib/systemd/system