Docker mount directory of volume

coreosdocker

I'm currently trying to make myself familiar with docker but encountered an issue by doing so. I'm trying to share a volume between two containers but I don't want them to put their files into the volumes root.

That's how it should look:

Container1: Mysql has to store /var/lib/mysql/* -> Volume1/mysql

Container2: Ngnix has to store /var/www/* -> Volume1/www

This is how it looks if the containers are created with:

-v Volume1:/var/lib/mysql/
-v Volume1:/var/www/

Container1: Mysql has to store /var/lib/mysql/* -> Volume1

Container2: Ngnix has to store /var/www/* -> Volume1

TLDR: I don't to create a volume for the sake of a single file but in order for that to be feasible I have to maintain order in the volume using directorys.

Best Answer

If I understand correctly, you wanted something like this:

docker run -it --name mysql -v volume/mysql:/mountpoint alpine ash
docker run -it --name nginx -v volume/nginx:/mountpoint alpine ash

But that's not possible. You can not mount a subdirectory of a volume.

If you need that fine-grained control, you'd be better off mounting host directorys just with -v

btw: There is no need for the nginx container to have the mysql files. other way round, mysql does not need the www files. i assume these were just generic examples

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