Check ZFS snapshot creation date. For Nagios NRPE

check_zfs_snap.sh

#!/bin/bash

FSNAME=$1
WARNAGE=$2
CRITAGE=$3

NOW=$(date +%s)

ZFS="sudo /sbin/zfs"
AWK="/usr/bin/awk"

# get all snapshots of zfs filesystem and search for newest snapshot
CREATIONDATE=$($ZFS get creation -Hpr -t snapshot $FSNAME | $AWK 'BEGIN {max = 0} {if ($3>max) max=$3} END {print max}')

DIFF=$((($NOW-$CREATIONDATE)/86400))

if [[ $WARNAGE > $CRITAGE ]]; then
  echo "usage: $0 <fsname> <warntime> <crittime>"
  echo " warntime must be smaller than crittime, written in days"
  exit 3
fi

RETVAL=3 # UNKNOWN

MSG=""

if [[ $DIFF > $CRITAGE ]]; then
  RETVAL=2 # CRITICAL
  MSG="SNAPSHOT CRITICAL:"
elif [[ $DIFF > $WARNAGE ]]; then
  RETVAL=1 # WARNING
  MSG="SNAPSHOT WARNING:"
else
  RETVAL=0 # OK
  MSG="SNAPSHOT OK:"
fi

DATEFMT=$(date -d @$CREATIONDATE +"%Y-%m-%d %H:%M")

echo "$MSG last snapshot $FSNAME created $DATEFMT"

exit $RETVAL