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Add zpool_capacity plugin
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K.Cima
parent
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259
plugins/zfs/zpool_capacity
Executable file
259
plugins/zfs/zpool_capacity
Executable file
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#!/bin/bash
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: << =cut
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=head1 NAME
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zpool_capacity - Munin plugin to monitor ZFS capacity
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These functions are implemented:
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capacity : to monitor zpool capacity %
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allocated : to monitor zpool allocated bytes
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dedup : to monitor zpool dedup and compress ratio
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Tested with Solaris 10 and 11, OpenIndiana Hipster, FreeBSD 11, CentOS 7
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=head1 CONFIGURATION
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Make symlink:
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cd /path/to/munin/etc/plugins
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ln -s /path/to/munin/lib/plugins/zpool_capacity .
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For FreeBSD, it should be necessary to change shebang /bin/bash -> /usr/local/bin/bash
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For Linux, root privilege is necessary to run zpool command.
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[zpool_capacity]
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user root
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=head1 ENVIRONMENT VARIABLES
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critical : default 90
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warning : default 80
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=head1 AUTHOR
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K.Cima https://github.com/shakemid
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=head1 LICENSE
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GPLv2
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=head1 Magic markers
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#%# family=contrib
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#%# capabilities=autoconf
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=cut
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# Include plugin.sh
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. "${MUNIN_LIBDIR:-}/plugins/plugin.sh"
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is_multigraph "$@"
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# Shell options
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set -o nounset
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# Global variables
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plugin_name=zpool_capacity
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functions='capacity allocated dedup'
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zpool_cmd=/sbin/zpool
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zfs_cmd=/sbin/zfs
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# Environment variables
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: "${warning:=80}"
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: "${critical:=90}"
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# Note: The performance of ZFS may significantly degrade when zpool capacity > 90%
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# See also: https://docs.oracle.com/cd/E53394_01/html/E54801/zfspools-4.html
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# Functions
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preconfig() {
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local func=$1
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local p c
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# data_attr format: field type draw label
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# label can contain white-spaces.
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data_attr=
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case $func in
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capacity)
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global_attr="
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graph_title ZFS storage pool - Capacity
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graph_category fs
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graph_args --base 1000 --lower-limit 0 --upper-limit 100
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graph_vlabel % allocated
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graph_info ZFS storage pool - Capacity
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warning ${warning}
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critical ${critical}
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"
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for p in $pool_list
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do
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data_attr="${data_attr}
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${p} GAUGE LINE2 ${p}"
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done
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;;
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allocated)
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global_attr="
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graph_title ZFS storage pool - Allocated bytes
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graph_category fs
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graph_args --base 1024 --lower-limit 0
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graph_vlabel Bytes
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graph_info ZFS storage pool - Allocated bytes
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"
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c=0
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for p in $pool_list
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do
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data_attr="${data_attr}
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${p}_size GAUGE LINE ${p} size
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${p}_allocated GAUGE LINE2 ${p} allocated"
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global_attr="${global_attr}
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${p}_size.colour COLOUR${c}
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${p}_allocated.colour COLOUR${c}"
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c=$(( c + 1 ))
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done
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;;
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dedup)
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global_attr="
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graph_title ZFS storage pool - Dedup and compress ratio
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graph_category fs
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graph_args --base 1000 --lower-limit 1
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graph_vlabel Ratio
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graph_info ZFS storage pool - Dedup and compress ratio
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"
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for p in $pool_list
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do
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data_attr="${data_attr}
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${p}_dedup GAUGE LINE ${p} dedup
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${p}_compress GAUGE LINE ${p} compress"
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done
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;;
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esac
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}
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do_config() {
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local func=$1
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local label_max_length=45
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local field type draw label
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preconfig "$func"
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echo "multigraph ${plugin_name}_${func}"
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# print global attributes
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echo "$global_attr" | sed -e 's/^ *//' -e '/^$/d'
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# print data source attributes
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echo "$data_attr" | while read -r field type draw label
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do
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[ -z "$field" ] && continue
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field=$( clean_fieldname "$field" )
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echo "${field}.type ${type}"
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echo "${field}.draw ${draw}"
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echo "${field}.label ${label:0:${label_max_length}}"
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if [ "$type" = 'DERIVE' ]; then
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echo "${field}.min 0"
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fi
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if [ "$label" = 'dummy' ]; then
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echo "${field}.graph no"
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fi
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done
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echo
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}
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get_stats() {
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local func=$1
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case $func in
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capacity)
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$zpool_cmd list -H -o name,capacity | sed 's/%$//'
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;;
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allocated)
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( $zpool_cmd list -H -o name,allocated \
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| awk '{ print $1"_allocated", $2 }'
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$zpool_cmd list -H -o name,size \
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| awk '{ print $1"_size", $2 }'
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) \
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| perl -ane '
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@unit{ qw/ K M G T P E / } = ( 1 .. 6 );
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$name = $F[0];
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$byteu = $F[1];
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( $n, $u ) = $byteu =~ /^([\d.]+)([KMGTPE]?)$/;
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$byte = int( $n * 1024 ** ( $u ? $unit{ $u } : 0 ) );
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print "$name $byte\n";
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'
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# Note: ZFS supports up to 16EB.
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;;
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dedup)
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$zpool_cmd list -H -o name,dedup \
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| sed 's/x$//' \
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| awk '{ print $1"_dedup", $2 }'
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$zpool_cmd list -H -o name \
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| xargs $zfs_cmd get -H -o name,value compressratio \
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| sed 's/x$//' \
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| awk '{ print $1"_compress", $2 }'
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;;
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esac
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}
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do_fetch() {
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local func=$1
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local zpool_stats field value
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# zpool_stats contains 'key value\n'
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zpool_stats=$( get_stats "$func" )
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echo "multigraph ${plugin_name}_${func}"
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echo "$zpool_stats" | while read -r field value
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do
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field=$( clean_fieldname "$field" )
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echo "${field}.value ${value}"
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done
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echo
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}
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autoconf() {
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if [ -x "$zpool_cmd" ]; then
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echo yes
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else
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echo "no (failed to find executable 'zpool')"
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fi
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}
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config() {
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local func
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pool_list=$( $zpool_cmd list -H -o name )
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for func in $functions
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do
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do_config "$func"
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done
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}
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fetch() {
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local func
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for func in $functions
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do
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do_fetch "$func"
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done
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}
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# Main
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case ${1:-} in
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autoconf)
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autoconf
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;;
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config)
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config
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[ "${MUNIN_CAP_DIRTYCONFIG:-}" = "1" ] && fetch
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;;
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*)
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fetch
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;;
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esac
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exit 0
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