1. 停止docker服务

   [root@docker]# systemctl stop docker

   
   

2. 创建devicemapper目录

   [root@docker]# mkdir-p/docker/devicemapper/devicemapper

   
   

3. 进入刚创建的devicemapper目录

   [root@docker~]#cd /docker/devicemapper/devicemapper/

   
   

4. 使用dd创建data文件，这里创建500G

   [root@dockerdevicemapper]#ddif=/dev/zeroof=databs=1Gcount=0seek=500

   
   

5. 启动docker服务
   

[root@docker~]# systemctl start docker