Centos7修改docker的Data Space Total大小

记得备份你的容器

此处就不多做介绍了

–storage-opts 参数

devicemapper文档：https://github.com/moby/moby/tree/master/daemon/graphdriver/devmapper
docker官方文档：https://docs.docker.com/engine/reference/commandline/dockerd/#options-per-storage-driver

修改docker的启动参数

停止docker，修改配置，重新加载配置

<code><span class="hljs-built_in">sudo</span> systemctl stop docker
<span class="hljs-built_in">sudo</span> vi /lib/systemd/system/docker.service</code>

找到 ExecStart=/usr/bin/dockerd
在这一行后面加上
--storage-opt dm.loopdatasize=8G --storage-opt dm.loopmetadatasize=4G --storage-opt dm.basesize=8G 即可，意思是为，设置devicemapper的data为8G，metadata为4G，镜像的大小不能大于8G

记得还要抹去现有的空间，请确保你已经完成了第一步

<code>sudo rm -rf /var/lib/docker
sudo mkdir -p /var/lib/docker/devicemapper/devicemapper/
sudo dd <span class="hljs-keyword">if</span>=<span class="hljs-regexp">/dev/zero</span> of=<span class="hljs-regexp">/var/lib</span><span class="hljs-regexp">/docker/devicemapper</span><span class="hljs-regexp">/devicemapper/data</span> bs=<span class="hljs-number">1</span>M count=<span class="hljs-number">0</span> seek=<span class="hljs-number">8192</span>
sudo dd <span class="hljs-keyword">if</span>=<span class="hljs-regexp">/dev/zero</span> of=<span class="hljs-regexp">/var/lib</span><span class="hljs-regexp">/docker/devicemapper</span><span class="hljs-regexp">/devicemapper/metadata</span> bs=<span class="hljs-number">1</span>M count=<span class="hljs-number">0</span> seek=<span class="hljs-number">4096</span></code>

完成后运行

<code><span class="hljs-built_in">sudo</span> systemctl daemon-reload
<span class="hljs-built_in">sudo</span> systemctl start docker
docker info</code>

查看是否设置正确，貌似比预设的大了一点点。