ceph docker 部署 使用raw格式的镜像作为磁盘

https://blog.youkuaiyun.com/qq_33932782/article/details/54896619

https://blog.youkuaiyun.com/klyhuntermax/article/details/51907856

https://ceph.com/planet/%E5%9F%BA%E4%BA%8Edocker%E9%83%A8%E7%BD%B2ceph%E4%BB%A5%E5%8F%8A%E4%BF%AE%E6%94%B9docker-image/

https://www.cnblogs.com/bladeyul/p/10649049.html

==========================================创建磁盘镜像

qemu-img create -f raw test.raw 8G

1.获取可以挂载的环回设备：

                 [root@virtserver ~]# losetup -f