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#!/bin/bash # -*- sh -*- : << =cut =head1 NAME if_ - Wildcard-plugin to monitor traffic and errors on network interfaces. =head1 CONFIGURATION This plugin does not normally require configuration. The plugin may need to run as root to determine the maximum speed of the network interface. This is configured like this: [if_*] user root If the interface speed cannot be determined automatically by this plugin, you may manually configure the speed using the "speed" environment variable, in megabits per second, like this: [if_*] env.speed 1000 To set warning and critical levels do like this: [if_*] env.warning 10000000 or [if_*] env.if_0_warning 10000000 This is a wildcard plugin. To monitor an interface, link if_<interface> to this file. For example, ln -s /usr/share/munin/plugins/if_ \ /etc/munin/plugins/if_eth0 will monitor eth0. Most devices found in /proc/net/dev can be monitored. Examples include ipsec*, eth*, irda*, and lo. Please note that aliases cannot be monitored with this plugin. =head1 AUTHOR Original author unknown Copyright (C) 2011 Diego Elio Pettenò <flameeyes@flameeyes.eu> =head1 LICENSE GPLv2 =head1 MAGIC MARKERS #%# family=auto #%# capabilities=autoconf suggest =cut . $MUNIN_LIBDIR/plugins/plugin.sh INTERFACE=${0##*if_} # Who whould have thought it's so much work to determine the # maximum speed of a network interface. Buckle up! findspeed_mbps() { # Do not use interface name to guess technology. Many many # wifi drivers use "eth*" names. IWLIST=$(type -p iwlist) if [[ -x "$IWLIST" ]]; then SPEED=$($IWLIST $INTERFACE rate 2>&1 | awk 'BEGIN { RATE="U" } { if ($2 == "Mb/s") RATE=$1; } END { print RATE; }') if [[ "$SPEED" != "U" ]]; then echo $SPEED return fi fi # sysfs can report the speed if the driver supports it (but it # doesn't work as well for wireless cards, thus why we check for # iwlist first) if [[ -r /sys/class/net/$INTERFACE/speed ]]; then SPEED=$(cat /sys/class/net/$INTERFACE/speed 2>/dev/null) if [[ "$SPEED" -gt 0 ]]; then echo $SPEED return fi fi ETHTOOL=$(type -p ethtool) if [[ -x "$ETHTOOL" ]]; then SPEED=$($ETHTOOL $INTERFACE 2>&1 | awk '/Speed:/ { gsub(/[^0-9]*/,"",$2); print $2; }') if [[ $SPEED == [0-9]* ]]; then echo $SPEED return fi fi MIITOOL=$(type -p mii-tool) if [[ -x $MIITOOL ]]; then case $($MIITOOL $INTERFACE 2>&1) in *1000base*) echo 1000; return ;; *100base*) echo 100; return ;; *10base*) echo 10; return ;; esac fi echo U } findspeed() { if [[ "$speed" ]]; then SPEED=$speed else SPEED=$(findspeed_mbps) fi if [[ -z "$SPEED" ]] || [[ "$SPEED" == "U" ]]; then printf "up.info Traffic of the %s interface. Unable to determine interface speed." $INTERFACE if [[ $EUID -ne 0 ]]; then echo " Please run the plugin as root." else echo " Please install ethtool, wireless-tools, mii-tool or whatever is appropriate for the interface." fi return fi BPS=$(( $SPEED * 1000 * 1000 )) cat <<EOF up.max $BPS up.info Traffic of the $INTERFACE interface. Maximum speed is $SPEED Mb/s. down.max $BPS EOF return } case $1 in autoconf) if [[ -r /proc/net/dev ]]; then echo yes exit 0 else echo "no (/proc/net/dev not found)" exit 0 fi ;; suggest) if [[ -r /proc/net/dev ]]; then sed -rne '/^[[:space:]]*(lo|gre[[:digit:]]|sit[[:digit:]]+|[a-z0-9]+\.[0-9]+):/d;s,^[[:space:]]*([^:]+):.*,\1,p' /proc/net/dev fi exit 0 ;; config) echo "graph_order down up" echo "graph_title $INTERFACE traffic" echo 'graph_args --base 1000' echo 'graph_vlabel bits in (-) / out (+) per ${graph_period}' echo 'graph_category network' echo "graph_info This graph shows the traffic of the $INTERFACE network interface. Please note that the traffic is shown in bits per second, not bytes. IMPORTANT: On 32-bit systems the data source for this plugin uses 32-bit counters, which makes the plugin unreliable and unsuitable for most 100-Mb/s (or faster) interfaces, where traffic is expected to exceed 50 Mb/s over a 5 minute period. This means that this plugin is unsuitable for most 32-bit production environments. To avoid this problem, use the ip_ plugin instead. There should be no problems on 64-bit systems running 64-bit kernels." echo 'down.label received' echo 'down.type DERIVE' echo 'down.graph no' echo 'down.cdef down,8,*' echo 'down.min 0' echo 'up.label bps' echo 'up.type DERIVE' echo 'up.negative down' echo 'up.cdef up,8,*' echo 'up.min 0' print_warning down print_warning up print_critical down print_critical up findspeed exit 0 ;; esac # Escape dots in the interface name (eg. vlans) before using it as a regex if [[ -r /sys/class/net/$INTERFACE/statistics/rx_bytes ]]; then echo "down.value $(cat /sys/class/net/$INTERFACE/statistics/rx_bytes)" echo "up.value $(cat /sys/class/net/$INTERFACE/statistics/tx_bytes)" else awk -v interface="$INTERFACE" \ 'BEGIN { gsub(/\./, "\\.", interface) } \ $1 ~ "^" interface ":" { split($0, a, /: */); $0 = a[2]; \ print "down.value " $1 "\nup.value " $9 \ }' \ /proc/net/dev fi