Simple script for bandwidth checks

files/all/usr/lib/nagios/plugins/check_bandwidth.sh

@@ -0,0 +1,90 @@
+#!/bin/sh
+#
+# Check bandwidth plugin for Nagios
+#
+# Usage: check_bandwidth.sh [-i interface] [-s sleep] [-w warning] [-c critical]
+#     -i, --interface         Interface name (eth0 by default)
+#     -s, --sleep             Sleep time between both statistics measures
+#     -w, --warning           Warning value (KB/s)
+#     -c, --critical          Critical value (KB/s)
+#     -h, --help              Display this screen
+#
+# (c) 2014, Benjamin Dos Santos <benjamin.dossantos@gmail.com>
+# https://github.com/bdossantos/nagios-plugins
+#
+
+while [[ -n "$1" ]]; do
+  case $1 in
+    --interface | -i)
+      interface=$2
+      shift
+      ;;
+    --sleep | -s)
+      sleep=$2
+      shift
+      ;;
+    --warning | -w)
+      warning=$2
+      shift
+      ;;
+    --critical | -c)
+      critical=$2
+      shift
+      ;;
+    --help | -h)
+      sed -n '2,11p' "$0" | tr -d '#'
+      exit 3
+      ;;
+    *)
+      echo "Unknown argument: $1"
+      exec "$0" --help
+      exit 3
+      ;;
+  esac
+  shift
+done
+
+warning=${warning:=5000}
+critical=${critical:=8000}
+interface=${interface:=eth0}
+sleep=${sleep:=1}
+
+if [[ $warning -ge $critical ]]; then
+  echo "UNKNOWN - warning ($warning) can't be greater than critical ($critical)"
+  exit 3
+fi
+
+if [[ ! -f "/sys/class/net/${interface}/statistics/rx_bytes" ]] ||
+  [[ ! -f "/sys/class/net/${interface}/statistics/tx_bytes" ]]; then
+  echo "CRITICAL - Could not fetch '${interface}' interface statistics"
+  exit 2
+fi
+
+rx1=$(cat "/sys/class/net/${interface}/statistics/rx_bytes")
+tx1=$(cat "/sys/class/net/${interface}/statistics/tx_bytes")
+sleep "$sleep"
+rx2=$(cat "/sys/class/net/${interface}/statistics/rx_bytes")
+tx2=$(cat "/sys/class/net/${interface}/statistics/tx_bytes")
+
+tx_bps=$((tx2 - tx1))
+rx_bps=$((rx2 - rx1))
+tx_kbps=$((tx_bps / 1024))
+rx_kbps=$((rx_bps / 1024))
+
+status="tx ${interface}: $tx_kbps kb/s, rx ${interface}: $rx_kbps kb/s | tx=$tx_kbps rx=$rx_kbps"
+
+if [[ $rx_kbps -ge $warning ]] || [[ $tx_kbps -ge $warning ]]; then
+  if [[ $rx_kbps -ge $critical ]] || [[ $tx_kbps -ge $critical ]]; then
+    exit_status=2
+    echo "CRITICAL - $status"
+  else
+    exit_status=1
+    echo "WARNING - $status"
+  fi
+else
+  exit_status=0
+  echo "OK - $status"
+fi
+
+exit ${exit_status:=3}
+