清理mac上Docker占用的磁盘空间

2017-03-01 10:15:58来源:https://xts.so/osx/Cleaning-up-Docker-For-Mac.html作者:xts.so人点击


Docker依赖Linux系统的cgroup实现,在mac系统中运行的时候,Docker会启动一个虚拟机中的Linux内核,并在硬盘上放一个qcow2
格式的磁盘镜像文件。这个文件会随着Docker的使用不断膨胀,即使删除不用的Docker Image和Container也不会缩小。我在测试完一个自动化工具的Dockerfile改写之后,Docker.qcow2文件就达到42GB了。



Google搜了一圏发现一个叫Théo Chamley的法国人写了一个脚本释放Docker.qcow2文件占用的空间。基本原理是用docker save
命令保存要保留的image,然后关闭Docker,删除Docker.qcow2,再启动Docker,它会自动重建,最后用docker load
命令恢复保留的image。


下面是这哥儿们写的脚本。


#!/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
fi
TMP_DIR=$(mktemp -d)
pushd $TMP_DIR >/dev/null
open -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."
done
echo "=> 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.qcow2
echo "==> 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."
done
popd >/dev/null
rm -r ${TMP_DIR}


Théo Chamley的博客原文


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