Docker 存储驱动

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# creat dir
mkdir lower upper work mnt

# mount lower upper work to mnt
mount -t overlay -o lowerdir=lower,upperdir=upper,workdir=work none mnt

# testing 
echo 1 > lower/1
mkdir lower/2
mkdir upper/3
ll mnt 

# recovery all setting
umount mnt
rm -rf lower upper work mnt