check_bond

#!/bin/bash
# Nagios plugin to monitor Nic Bonding state
#
# Based on check_bond.sh written by L.Gill 10/08/06 - V.1.0 as found on
# http://exchange.nagios.org/directory/Plugins/Operating-Systems/Linux/check-network-bonding/details

# currently I maintain my own version at https://github.com/aswen/nagios-plugins/blob/master/check_bond
# Copyright (c) 2010 L.Gill
# Copyright (c) 2011 Alexander Swen <a@swen.nu>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
#
# Example configuration
#
# Typical this check is placed on a client and runs via nrpe
# So add this to nrpe.cfg:
#  command[check_bond]=/usr/lib/nagios/plugins/check_bond
# This should warn when one of the slaves is down and go critical when the whole bond is not available.
# This plugin defaults to bond0. If you have multiple bonds you can tell the script so by adding -i <if>.
# It will also warn if the Currently Active Slave is not the expected primary interface,
# the default primary interface is eth0, You can override this with -p <if>

#  if you have dont_blame_nrpe=1 set you can choose to
#  command[check_bond]=/usr/lib/nagios/plugins/check_bond -i $ARG1$ -p $ARG2$
#
# define service {
#  use generic-service
#  service_description Bond state
#  check_command check_nrpe!check_bond
# or
#  check_command check_nrpe!check_bond!bond1
# or
#  check_command check_nrpe!check_bond!bond1!eth1
#}
#

# ------------------------------------------
# ########  Script Modifications  ##########
# ------------------------------------------
# Who    When      What
# ---    ----      ----
# A.Swen  2011-09-07 Add support for other bond module than bond0 (defaults to bond0 however)
# A.Swen  2013-10-11 Remove some obsolete stuff and make the script shorter
# B.Potts 2017-01-16 Check and display expected primary interface on bond
#
#
# SETTINGS
# Default if is bond0
if=bond0
# Default pri is eth0
pri=eth0

# commands
GREP=/bin/grep
AWK=/usr/bin/gawk
LSMOD=/sbin/lsmod

# FUNCTIONS
get_options () {
  [ $# -gt 0 ]||result 5
  while getopts "i:p:" opt;do
    case ${opt} in
      i) export if=`echo ${OPTARG}` ;;
      p) export pri=`echo ${OPTARG}` ;;
      *) result 5;;
    esac
done
}

result () {
  case $1 in
    0) echo "OK: - Bondingmode: $(grep "Bonding Mode:" /proc/net/bonding/${if}), active link: $2";;
    1) echo "UNKNOWN: plugin error";rc=3;;
    2) echo "CRITICAL: bonding module not loaded";rc=2;;
    3) echo "WARNING: state of ${if} device $2 is $3";rc=1;;
    4) echo "UNKNOWN: no bondinterface with name ${if} found";rc=3;;
    5) echo "UNKNOWN: Usage: ${me} [-i <bond interface name>] [-p <expected primary interface name>]";rc=3;;
    6) echo "CRITICAL: bondinterface ${if} has no active slaves";rc=2;;
    7) echo "WARNING: Bondingmode: $(grep "Bonding Mode:" /proc/net/bonding/${if}), (unexpected) active link: $2";rc=1;;
  esac
}

# SCRIPT
# 1st set default return code:
rc=0

# test if this script was called correctly
[ $# -eq 1 -o $# -eq 3 -o $# -gt 4 ] && result 5
[ $rc -gt 0 ] && exit $rc

[ $# -eq 2 -o $# -eq 4 ] && get_options $@
[ $rc -gt 0 ] && exit $rc

# 1st we check if bonding module is loaded
[ "$(${LSMOD}|grep bonding)" = "" ] && result 2
[ $rc -gt 0 ] && exit $rc

# test if there is any bond interface with this name
[ -f "/proc/net/bonding/${if}" ] || result 4
[ $rc -gt 0 ] && exit $rc

# Inspect the state of the entire bond interface
ifstate=$(${AWK} '/Currently Active Slave/ {print $4}' /proc/net/bonding/${if})
[ "${ifstate}" = "None" ]&& result 6
[ "${ifstate}" = "${pri}" ] || result 7 "${ifstate}"
[ $rc -gt 0 ] && exit $rc

# test state of each if in bond
ethdevs=$(${AWK} '/Slave Interface/ {print $3}' /proc/net/bonding/${if})
for ethdev in ${ethdevs};do
  state=$(${GREP} -A1 "Slave Interface: ${ethdev}" /proc/net/bonding/${if}|${AWK} '/MII Status:/ {print $3}')
  if [ "${state}" != "up" ];then
    result 3 ${ethdev} ${state}
  fi
done

[ $rc -eq 0 ] && result 0 "${ifstate}"
exit $rc

#END