docker_dangling_space

#!/bin/bash

#
# Graphs the disk-space used up by dangling volumes. You probably want this to stay at 0
#

DOCKER=${docker_path:-/usr/bin/docker}
VOLUME_FOLDER=${volume_path:-/var/lib/docker/volumes}


case $1 in
    autoconf)
        if [ -x ${DOCKER} ] ; then
            echo "yes"
        else
            echo "no ('${DOCKER}' is not executable. You can override the path using the 'docker_path' environment variable)!"
        fi
        exit 0;;
    config)
        echo "graph_title Dangling Volumes Size"
        echo "graph_vlabel size"
        echo "graph_category docker"
        echo "graph_printf %3.0lf"
        echo "graph_args --base 1024 --lower-limit 0"
        echo "dangling_size.label Size of dangling volumes"
        echo "upgrades.draw AREA"
    exit 0;;
esac


TOTAL_SPACE=0
for line in $(${DOCKER} volume ls -f dangling=true | cut -c "21-" | tail -n +2); do
    folder_size=$(du -s ${VOLUME_FOLDER}/${line} | cut -f 1)
    TOTAL_SPACE=$(($TOTAL_SPACE + $folder_size))
done


echo dangling_size.value ${TOTAL_SPACE}