Munin contributed plugins

#!/bin/bash

: << =cut

=head1 NAME

  io_disk - Multigraph plugin to monitor disks for Solaris.

  These functions are implemented:

     ops     : similar to iostat r/s, w/s

     bytes   : similar to iostat kr/s, kw/s 

     busy    : similar to iostat %b, %w (%w usually indicates 0 in Sol10,11)

     queue   : similar to iostat actv, wait

     latency : similar to iostat asvc_t, wsvc_t

  This plugin is improved from Solaris io_busy_, io_ops_, io_bytes_ plugins.

  Any device found in /usr/bin/kstat can be monitored.

  Tested with Solaris 10 and 11, and it should work with Solaris 8, 9.

=head1 CONFIGURATION

  Make symlink:

    cd /path/to/munin/etc/plugins

    ln -s /path/to/munin/lib/plugins/io_disk .

  The RRD files generated by io_busy_, io_ops_, io_bytes_ can be taken over 

  by this plugin.

  Thus, please remove symlinks of those plugins before using this plugin.

  By default, this plugin monitors disk devices. And also it can monitor 

  NFS and Tape devices as much as io_* plugins with setting environments.

  Note that instance names of nfs (e.g. nfs1) can be changed after reboot or

  remount, this plugin may not monitor nfs properly. (same as original ones)

=head1 ENVIRONMENT VARIABLES

  env.class - kstat class. See man kstat -c option.

    example:  env.class  /disk|nfs|tape/

    default:  disk

  env.module - Module name. Only used in internal graph name.  

    example:  env.module  something

    default:  sd

    If you would not like to take over RRDs generated by io_*_sd plugins,

    please change it to another name.

    And also, if you would like to take over RRDs of nfs, tape devices,

    please set it 'nfs' or 'tape' (and set env.class, env.module_regex).

    It may be good to link like ln -s /path/to/io_disk io_nfs if necessary.

  env.module_regex - kstat module. See man kstat -m option.

    example:  env.module_regex  /^(s?sd|vdc|zvblk|dad|md|nfs|tape)$/

    default:  /^(s?sd|vdc|zvblk|dad|md)$/

  env.title_type - Device type shown in graph title.

    example:  env.title_type  Disk Device, NFS, Tape

    default:  Disk Device

  env.exclude - Device instance name(s) to exclude seperated by white-space.

    example:  env.exclude  sd0 ssd1

    default:  none

  env.graph_width - Graph width in pixel

    example:  env.graph_width  450

    default:  none (usually 400)

=head1 AUTHOR

  Unknown Author

  Improved by K.Cima https://github.com/shakemid

=head1 LICENSE

  GPLv2

=head1 MAGIC MARKERS

  #%# family=auto

  #%# capabilities=autoconf

=cut

# Include plugin.sh

. "${MUNIN_LIBDIR:-}/plugins/plugin.sh"

is_multigraph "$@"

# Shell options

set -o nounset  # Like perl use strict;

# Set environment variables

plugin_name=io

functions='ops bytes busy queue latency'

: "${class:=disk}"

: "${module:=sd}"

: "${module_regex:=/^(s?sd|vdc|zvblk|dad|md)\$/}"

: "${title_type:=Disk Device}"

: "${exclude:=}"

: "${graph_width:=}"

# Create map of instance name (e.g. sd0) and logical device name (e.g. c0t0d0)

#   Example: 

#     name_sd1=c0t0d0

#     name_ssd2=c0tAB_1234d0  (shorten long target)

#     ...

instance_names=$( iostat -x | sed -e '1,2d' | awk '{print $1}' | \

    sed -e 's/^/name_/' )

logical_device_names=$( iostat -xn | sed -e '1,2d' | awk '{print $NF}' | \

    sed -e 's/^\(c[0-9]*\)\(t.\{2\}\).*\(.\{4\}\)\(d[0-9]*\)$/\1\2_\3\4/' )

declare $( paste -d= <( echo "$instance_names" ) <( echo "$logical_device_names" ) )

# Functions

preconfig() {

    local func

    func=$1

    case "$func" in

    ops)

        conf_title='I/O Operations'

        conf_in=reads

        conf_out=writes

        conf_cdef=

        conf_gargs='--base 1000'

        conf_vlabel='Ops per second write (-) / read (+)'

        ;;

    bytes)

        conf_title='I/O Throughput'

        conf_in=nread

        conf_out=nwritten

        conf_cdef=

        conf_gargs='--base 1024'

        conf_vlabel='Bytes per second write (-) / read (+)'

        ;;

    busy)

        conf_title='Busy & Wait'

        conf_in=rtime

        conf_out=wtime

        conf_cdef=',100,*'

        conf_gargs='--base 1000 --lower-limit 0 --upper-limit 100'

        conf_vlabel='% wait (-) / busy (+)'

        ;;

    queue)

        conf_title='Queue Length'

        conf_in=rlentime

        conf_out=wlentime

        conf_cdef=

        conf_gargs='--base 1000'

        conf_vlabel='Queue length wait (-) / actv (+)'

        ;;

    latency)

        conf_title='Latency'

        conf_in=rlentime

        conf_out=wlentime

        conf_cdef=

        conf_gargs='--base 1000'

        conf_vlabel='Seconds wsvc_t (-) / asvc_t (+)'

        ;;

    *)

        echo "Unknown function: $func"

        exit 1

        ;;

    esac

}

is_excluded() {

    local dev i

    dev=$1

    for i in ${exclude}

    do

        if [ "$dev" = "$i" ]; then

            return 0

        fi

    done

    return 1

}

do_config() {

    local func dev ref devname stat

    func=$1

    preconfig "$func"

    echo "multigraph ${plugin_name}_${func}_${module}"

    echo "graph_title $title_type $conf_title"

    echo 'graph_category disk'

    echo "graph_args $conf_gargs"

    echo "graph_vlabel $conf_vlabel"

    if [ -n "$graph_width" ]; then

        echo "graph_width $graph_width"

    fi

    # Get device instance names by kstat

    kstat -p -c "$class" -m "$module_regex" -s "/^${conf_in}\$/" | sed 's/:/ /g' | awk '{ print $3 }' | \

    while read -r dev

    do

        is_excluded "$dev" && continue

        # Replace instance name to logical device name if exists

        ref="name_$dev"

        devname=${!ref:-}  # ${!varname} means indirect evaluation (similar to eval)

        # reads and writes are necessary to calculate latency

        if [ "$func" = 'latency' ]; then

            for stat in reads writes

            do

                echo "${dev}_$stat.label dummy" 

                echo "${dev}_$stat.graph no"

                echo "${dev}_$stat.type DERIVE"

                echo "${dev}_$stat.min 0"

            done

            # rlentime / ( reads + writes )

            conf_cdef=,${dev}_reads,${dev}_writes,+,/

        fi

        echo "${dev}_${conf_out}.label dummy" 

        echo "${dev}_${conf_out}.graph no"

        echo "${dev}_${conf_out}.type DERIVE"

        echo "${dev}_${conf_out}.min 0"

        echo "${dev}_${conf_in}.label ${devname:-${dev}}"

        echo "${dev}_${conf_in}.negative ${dev}_${conf_out}"

        echo "${dev}_${conf_in}.type DERIVE"

        echo "${dev}_${conf_in}.min 0"

        if [ -n "$conf_cdef" ]; then

            echo "${dev}_${conf_out}.cdef ${dev}_${conf_out}${conf_cdef}"

            echo "${dev}_${conf_in}.cdef ${dev}_${conf_in}${conf_cdef}"

        fi

    done

    echo

}

do_getvalue() {

    local func stat_regex dev stat value

    func=$1

    preconfig "$func"

    if [ "$func" = 'latency' ]; then

        stat_regex="/^($conf_in|$conf_out|reads|writes)\$/"

    else

        stat_regex="/^($conf_in|$conf_out)\$/"

    fi

    echo "multigraph ${plugin_name}_${func}_${module}"

    # Get device instance names, stat names and values by kstat

    # kstat output example:

    #   $ kstat -p -c disk -m '/^sd$/' -s '/^reads$/'

    #   sd:0:sd0:reads  51432610

    #   sd:1:sd1:reads  52671435

    #   ...

    kstat -p -c "$class" -m "$module_regex" -s "$stat_regex" | sed 's/:/ /g' | awk '{ print $3,$4,$5 }' | \

    while read -r dev stat value

    do

        is_excluded "$dev" && continue

        echo "${dev}_${stat}.value ${value%.*}"

    done

    echo

}

autoconf() {

    if [ -x /usr/bin/kstat ]; then

        echo yes

        exit 0

    else

        echo "no (/usr/bin/kstat not found)"

        exit 0

    fi

}

config() {

    local func

    for func in $functions

    do

        do_config "$func"

    done

}

getvalue() {

    local func

    for func in $functions

    do

        do_getvalue "$func"

    done

}

# Main

case ${1:-} in

autoconf)

    autoconf

    ;;

config)

    config

    ;;

*)

    getvalue

    ;;

esac

exit 0