Can we mount sub-directories of a named volume in docker?
The docker-compose file https://docs.docker.com/compose/compose-file/#/volumes-volume-driver shows various ways to mount host sub-directories relative to the compose file.
volumes: # Just specify a path and let the Engine create a volume
# Specify an absolute path mapping
# Path on the host, relative to the Compose file
# User-relative path
# Named volume
Is is possible to mount a sub-directory of a named volume at a specific location? For example something like below, which I tried, but does not seem to work.
# Named volume - datavolume/sql_data:/var/lib/mysql
I am assuming I might be able to manage this by mounting the data volume to a location like
/data and then in the Dockerfiles for each container, create symbolic links from the sub-directories to the locations.
for example in a docker-compose.yml file
volumes: - datavolume:/data
and then in the container Dockerfile
RUN ln -s /data/sql_data /var/lib/mysql
I started going down this path but it was getting messy and was not working. Before I either abandon that approach or invest the time debugging it, I wanted to make sure there was no way to just specify sub-directories of a named vollume.
One Solution collect form web for “Can we mount sub-directories of a named volume in docker?”
compose/config/config.py#load(config_details) check if
datavolume/sql_data matches a named volume (in
datavolume/sql_data would not.