ZFS management scripts

check-zfs-status

#!/bin/bash

PATH="/sbin:/bin:/usr/sbin:/usr/bin"

state=$(zpool status | grep state)
if [ "$state" != " state: ONLINE" ]; then
	echo "Zpool status state is not ONLINE"
	zpool status
	exit 1
fi

errors=$(zpool status | grep errors | grep -v "with 0 errors")
if [ "$errors" != "errors: No known data errors" ]; then
	echo "Zpool status possible known data errors"
	zpool status
	exit 1
fi

make-zfs-snapshot

#!/bin/bash

set -e

PATH="/sbin:/bin:/usr/sbin:/usr/bin"

zpoolname="$1"
currdate=$(date +%Y%m%d)
snapshotname="${zpoolname}@autosnapshot-$currdate"
zfs snapshot $snapshotname

thendate=$(date -d "now - 14 days" +%Y%m%d)
thensnapshotname="${zpoolname}@autosnapshot-$thendate"
if zfs list -t snapshot | grep "$thensnapshotname " >/dev/null; then
	exists=1
else
	exists=0
fi

# check if this snapshot is the oldest one
zfs list -t snapshot | grep ${zpoolname}@autosnapshot | awk '{print $1}' | while read snapname; do
	snapdate=$(echo "$snapname" | cut -d- -f2)
	if [ "$snapdate" -lt "$thendate" ]; then
		echo "Warning: An autosnapshot exists older than 2 weeks ago: $snapname"
		echo "Exiting to prevent causing trouble"
		exit 1
	fi
done

if [ "$exists" != "1" ]; then
	echo "Warning: The 2 week old snapshot $thensnapshotname didn't exist"
	echo "Exiting to prevent causing trouble"
	exit 1
fi

zfs destroy $thensnapshotname

zfs.cron

0 10 * * * root /etc/bin/check-zfs-status
0 18 * * * root /etc/bin/make-zfs-snapshot storage

Make sure your cron can send e-mails before using this, so you're notified in the case of problems :-)