Unable to docker commit

CentOS 7 uses docker.

I ran docker commit, but the following error occurred and I cannot print it to the image.

$docker commit testsys testsys
Error response from daemon: devmapper: Thin Pool has 145060 free data blocks which is less than minimum required 163840 free data blocks. Create more free space in used dm.min_free_space option to change behavior

For overseas sites
rm-rf/var/lib/docker
I found an article telling me to do and re-insert docker.

I don't want to erase this container because I have various settings in the current container.
If you know how to make images, please let me know.