Docker run error: "Thin Pool has free data blocks which is less than minimum required"
We are trying to run a docker in a way that used to work, but now we get a "Thin Pool lack of space" error:
docker run --privileged -d --net=host --name=fat-redis -v /fat/deploy:/fat/deploy -v /fat/fat-redis/var/log:/var/log -v /home:/home fat-local.indy.xiolab.myserv.com/fat-redis:latest /fat/deploy/docker/fat-redis/fat_start_docker_inner.sh
docker: Error response from daemon: devmapper: Thin Pool has 486 free data blocks which is less than minimum required 163840 free data blocks. Create more free space in thin pool or use dm.min_free_space option to change behavior.
See 'docker run --help'.
What does this error mean? We tried 'docker rmi' and the advise from here, but all in vain.
Any ideas?
Thank you
Answer
Running with data/metadata over loopback devices was the default on older versions of docker. There are problems with this, and newer versions have changed this default. If docker was configured this way, then normal updates (e.g. through rpm/apt) don't change the configuration, which is why a full reinstall was required to fix.
Here's an article with instructions on how to configure older versions to not use loopback devices: http://www.projectatomic.io/blog/2015/06/notes-on-fedora-centos-and-docker-storage-drivers/