Clean docker environment: devicemapper

Question

I have a docker environment with 2 containers (Jenkins and Nexus, both with their own named volume). I have a daily cron-job which deletes unused containers and images. This

Answer 1

I faced the same issue where in my /var/lib/docker/devicemapper/devicemapper/data file has reached ~91% of root volume(~45G of 50G). I tried removing all the unwanted images, deleted volumes, nothing helped in reducing this file.

Did a few googling and understood that the "data" files is loopback-mounted sparse files and docker uses it to store the mount locations and other files we would have stored inside the containers.

Finally I removed all the images which were run before and stopped

docker rm $(docker ps -aq)

The reduced the devicemapper file significantly. Hope this may help you .