docker for mac 有个bug，删除了容器或者镜像后，docker 占用的电脑硬盘空间不会相应的减少（Docker.qcow2文件）。
这位法国老哥写了个脚本自动把docker镜像保存到本地， 删除Docker.qcow2文件，重启docker ，再把保存下来的镜像 load 到docker 中。
https://blog.mrtrustor.net/post/clean-docker-for-mac/
docker-clean.sh
#!/bin/bash# Copyright 2017 Théo Chamley
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
# to whom the Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or
# substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
# BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,IMAGES=$@echo "This will remove all your current containers and images except for:"
echo ${IMAGES}
read -p "Are you sure?[yes/NO]" -n 1 -r
echo # (optional) move to a new line
if [[ ! $REPLY =~ ^[Yy]$ ]]
then
exit 1
fiTMP_DIR=$(mktemp -d)pushd $TMP_DIR >/dev/nullopen -a Docker
echo "=> Saving the specified images"
for image in ${IMAGES}; do
echo "==> Saving ${image}"
tar=$(echo -n ${image} | base64)
docker save -o ${tar}.tar ${image}
echo "==> Done."
doneecho "=> Cleaning up"
echo -n "==> Quiting Docker"
osascript -e 'quit app "Docker"'
while docker info >/dev/null 2>&1; do
echo -n "."
sleep 1
done;
echo ""echo "==> Removing Docker.qcow2 file"
rm ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/Docker.qcow2echo "==> Launching Docker"
open -a Docker
echo -n "==> Waiting for Docker to start"
until docker info >/dev/null 2>&1; do
echo -n "."
sleep 1
done;
echo ""echo "=> Done."echo "=> Loading saved images"
for image in ${IMAGES}; do
echo "==> Loading ${image}"
tar=$(echo -n ${image} | base64)
docker load -q -i ${tar}.tar || exit 1
echo "==> Done."
donepopd >/dev/null
rm -r ${TMP_DIR}