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:
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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