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参考 http://coolshell.cn/articles/17200.html#more-17200 找到答案了 
- [yjh@dhcp-11-111 ~]$ cat /var/lib/docker/devicemapper/metadata/f8852d4278ed7101265bbbbdb5a47a086672faa67a1616a45f041f20be5b794f
- {"device_id":2,"size":10737418240,"transaction_id":2,"initialized":false,"deleted":false}
- [yjh@dhcp-11-111 ~]$ sudo dmsetup message /dev/mapper/docker-253\:0-2630390-pool 0 "create_snap 500 2"
- [yjh@dhcp-11-111 ~]$ sudo dmsetup create dockersnap --table "0 20971520 thin /dev/mapper/docker-253:0-2630390-pool 500"
- [yjh@dhcp-11-111 ~]$ sudo mount /dev/mapper/dockersnap mnt/docker-image
- [yjh@dhcp-11-111 ~]$ ls mnt/docker-image/
- id rootfs
- [yjh@dhcp-11-111 ~]$ ls mnt/docker-image/rootfs
- bin boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
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