修改docker数据默认存储位置

默认路径:/var/lib/docker

新路径:　/www/docker

#数据剪切.

Centos 6.*
service docker stop
Centos 7.8
systemctl stop docker

mkdir /www/docker

mv /var/lib/docker/* /www/docker/
rm -rf /var/lib/docker
ln -s /www/docker /var/lib/docker

#修改docker配置文件

vi /usr/lib/systemd/system/docker.service
最后面一句修改为:
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --graph /www/docker

#reload配置并重启docker

systemctl daemon-reload
systemctl restart docker.service

成功.