Munin contributed plugins

#!/usr/bin/env bash

#

# Plugin to monitor a ZFS Filesystem

#

# Wildcard-plugin to monitor a zfs filesystems.

#

# To monitor a filesystem, link zfs_fs_<zpool>_<filesystem> to this file. E.g.

#

#    ln -s /usr/share/munin/node/plugins-auto/zfs_fs_ /etc/munin/node.d/zfs_fs_tank_foo

#

# ...will monitor tank/foo fs.

#

# You can monitor zpool as well by a link on zfs_fs_<zpool>

#

# Parameters understood:

#

# 	config   (required)

# 	autoconf (optional - used by munin-config)

#

# ** WARNING **

# For now this plugin does not allow "_" in the name of a zpool or filesystems

#

#  #%# capabilities=autoconf

#

myname=$(basename "$0" | sed 's/^zfs_fs_//g' | sed -e 's/_/\//g')

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

    if which zfs >/dev/null; then

        echo yes

    else

        echo "no (missing executable 'zfs')"

    fi

    exit 0

fi

read -r -a values <<<"$(zfs get -p usedbydataset,usedbychildren,usedbysnapshots,usedbyrefreservation,available,quota "$myname" \

    | awk 'BEGIN {total=0;} { if( NR==1 ) next; } !/quota/ {total=total+$3;} {print $3} END{print total;}')"

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

    cat <<EOF

graph_title zfs $myname

graph_order usedbydataset usedbychildren usedbysnapshots usedbyrefreservation available total quota

graph_args --base 1024 -r -l 0 --vertical-label Bytes

graph_info This graph shows how is used a zfs filesystems.

graph_category fs

graph_period second

usedbydataset.label UsedByDataset

usedbydataset.draw AREA

usedbydataset.info Used space by Dataset

usedbydataset.colour FF0000

usedbychildren.label UsedByChildren

usedbychildren.draw STACK

usedbychildren.info Used space by children

usedbychildren.colour FFCC33

usedbysnapshots.label UsedBySnapshots

usedbysnapshots.draw STACK

usedbysnapshots.info Used space by snapshot

usedbysnapshots.colour 0000FF

usedbyrefreservation.label Usedbyrefreservation

usedbyrefreservation.draw STACK

usedbyrefreservation.info Used space by Ref Reservation

usedbyrefreservation.colour 33CCFF

available.label Available

available.draw STACK

available.info Free space

available.colour 00FF00

total.label Total

total.draw LINE1

total.info Total

total.colour 000000

quota.label Quota

quota.draw LINE1

quota.info Quota

quota.colour 555555"

EOF

    exit 0

fi

cat <<EOF

usedbydataset.value ${values[0]}

usedbysnapshots.value ${values[2]}

usedbychildren.value ${values[1]}

usedbyrefreservation.value ${values[3]}

available.value ${values[4]}

total.value ${values[6]}

quota.value ${values[5]}

EOF

exit 0