Munin contributed plugins

#!/bin/bash

: << =cut

=head1 NAME

Munin plugin to monitor apache mod_cache_disk usage.

=head1 CONFIGURATION

[apache_cache_disk_count]

	user www-data

	env.cache_path /var/cache/apache2/mod_cache_disk

	env.strings css js

	env.label_cs CSS

	env.colour_css FFFF00

	env.label_js JS

	env.colour_js FF0000

=head1 AUTHOR

Raphaël Droz <raphael.droz+floss@gmail.com>

=head1 LICENSE

GPLv2

=head1 MAGICK MARKERS

 #%# family=auto

 #%# capabilities=autoconf

=cut

. $MUNIN_LIBDIR/plugins/plugin.sh

my_cache_path="${cache_path:-/var/cache/apache2/mod_cache_disk}"

declare -a fieldnames labels colours

getenvdata() {

    let during_autoconf=0

    [[ $1 == -v ]] && during_autoconf=1

    arg=( "${strings:-}" )

    for i in ${arg[*]}; do

        if [[ ! $i =~ ^[a-zA-Z0-9]+$ ]]; then

            (( $during_autoconf )) && echo "no ($i isn't a valid fixed-string)"

            ok=0

            continue

        fi

        label=label_$i

        if [[ -z "${!label}" ]]; then

            (( $during_autoconf )) && echo "no ($i isn't given a label)"

            ok=0

            continue

        fi

        colour=colour_$i

        if [[ -z "${!colour}" ]]; then

            (( $during_autoconf )) && echo "no ($i isn't given a colour)"

            ok=0

            continue

        fi

        fieldnames+=($i)

        labels+=("${!label}")

        colours+=("${!colour}")

    done

}

if [[ $1 == autoconf ]]; then

    let ok=1

    [[ -z $strings ]] && echo "no strings to monitor defined" && ok=0

    ! type -P htcacheclean &>/dev/null && echo "can't find htcacheclean" && ok=0

    ! test -d "$my_cache_path" && echo "cache_path \"$cache_path\" is not readable" && ok=0

    getenvdata -v

    (( ${#fieldnames[*]} == 0 )) && echo "no (no valid strings)" && ok=0

    (( $ok == 1 )) && echo yes

    exit 0

fi

getenvdata

if [[ $1 == config ]]; then

cat <<EOF

graph_title Apache mod_cache_disk usage

graph_title Number of entries in mod_cache_disk Apache cache

graph_args --base 1000 -l 0

graph_vlabel Y

graph_category webserver

graph_order ${fieldnames[*]} total

total.draw LINE1

total.label all

total.type GAUGE

total.min 0

EOF

    let i=0

    while (( $i < ${#fieldnames[*]} )); do

        string=${fieldnames[$i]}

        label="${labels[$i]}"

        colour="${colours[$i]}"

        cat <<EOF

${string}.draw AREASTACK

${string}.label ${label}

${string}.colour ${colour}

EOF

        ((i++))

    done

    exit 0

fi

total=$(htcacheclean -a -p "$my_cache_path"|wc -l)

asset_count=$(htcacheclean -a -p "$my_cache_path"|egrep -o "\.($(echo ${fieldnames[*]}|tr ' ' '|'))"|sort|uniq --count)

printf "total.value %d\n" "$total"

for i in ${fieldnames[*]}; do

    c=$(echo "$asset_count"|sed -rn "/$i/s;^\s*([0-9]+).*;\1;p")

    [[ -z $c ]] && c=U

    printf "%s.value %s\n" "$i" "$c"

done

exit 0