Docker base image filesystem -


docker can't modify base image's filesystem, can't copy it. how can store changes during container usage? see stores files under /var/lib/docker, how can store filesys' changes without modifying it? methodology?

it store changes through new filesystem layer, because of copy-on-write mechanism:

https://www.softnas.com/wp/wp-content/uploads/2014/06/feature-cow-full.png

those changes disappear after docker rm (unless docker commit right after docker stop)

if want persistence, need use a volume or use data volume container.

when doing docker run, can mount volume host or mount 1 data container.


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