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#!/bin/bash
# softraid.monitor
# Linux Software RAID check with mon compatible output/return values
# For monitoring, call without arguments.
# To initialize a reference file, call with argument "learn".
# This script does not need root permissions, but the calling user needs
# permissions to read and write a reference file.
# The reference file $md_ref must exist. To generate it:
# softraid.monitor learn
# THIS NEEDS TO BE SOMEWHERE THE CHECKING USER CAN WRITE
md_ref="/var/something/mdstat.reference"
#
# Return values: 3 /proc/mdstat missing, no Software RAID?
# 2 reference file either missing or not writeable with learn
# 1 RAID not okay
# 0 all okay
# Author: Kevin Ivory
# Copyright: 2004-2011, Kevin Ivory <Ivory@SerNet.de>
# License: GNU General Public License
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# basic script security: begin
# no default access for group and others to new files/directories
umask u=rwx,go=
# Set very basic PATH, add only as needed
export PATH=/usr/bin:/bin
# Internal Field Separator (word splitting)
# if unset, default value is <space><tab><newline>
unset IFS
# Do not let user preload libraries with the environment variables:
unset LD_PRELOAD LD_LIBRARY_PATH
# No language specials, only Posix standard
unset LANG
export LC_ALL=POSIX
# set -u Treat unset variables and parameters other than the
# special parameters "@" and "*" as an error when per-
# forming parameter expansion. If expansion is attempted
# on an unset variable or parameter, the shell prints an
# error message, and, if not interactive, exits with a
# non-zero status.
set -u
# basic script security: end
mdstat="/proc/mdstat"
if [ ! -r "$mdstat" ]; then
echo -e "$HOSTNAME:$0
Missing RAID status file: $mdstat
Perhaps no software RAID?"
exit 3
fi
# auto-read-only is a normal status used for boot/hibernation: at this time
# it is critical for raid-array to be read-only. It automatically switches
# to read-write on first write (that is the 'auto' bit - it automatically
# stops being read-only).
# regular expression used because of kernel dependent output
if [ "${1:-unset}" = "learn" ]; then
sed 's/active \?(auto-read-only)/active/' "$mdstat" > "$md_ref"
[ $? -ne 0 ] && { echo "Writing to $md_ref failed."; exit 2; }
fi
if [ ! -r "$md_ref" ]; then
echo -e "$HOSTNAME:$0
Missing RAID reference file: $md_ref
Generate with: $0 learn"
exit 2
fi
md_out="Complete contents of $mdstat:\n\n$(cat $mdstat)"
diff=$(diff -U 0 -w $md_ref <(sed 's/active \?(auto-read-only)/active/' $mdstat))
stat=$?
if [ $stat -eq 0 ]; then
echo -e "$HOSTNAME\nSoftware RAID ok:\n$md_out"
else
echo -e "$HOSTNAME\nSoftware RAID not ok:\n$diff\n\n$md_out"
exit 1
fi
# end of softraid.monitor
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