How to "undeclare" volumes in docker image?
Not possible to change an existing container, so you have two options:
- Take the Tutum container and build your own variant
- Manage persistence of the tutum container using a data container.
Data containers
Create a container that creates a data volume reference:
docker run -it --name dbvol -v /var/lib/mysql ubuntu env
This can then be used when running the mysql database to persist the data:
docker run -d --volumes-from dbvol -p 3306:3306 tutum/mysql:5.6
The data persists as long as the "dbvol" container exists. It can be deleted at any stage:
docker rm dbvol
Reference:
- http://blog.tutum.co/2014/05/27/containerize-your-database-volume-with-tutum-mysql-images/
- https://docs.docker.com/userguide/dockervolumes/
You can't really undeclare a volume, but you can build your own version of the original image by modifying its dockerfile.