Storage

Storage drivers are also called as Graph drivers.

Which driver to use depends on the context (OS and local configuration factors).

overlay2 - recent Ubuntu, CentOS and RHEL versions

aufs - Ubuntu 14.04 and older

devicemapper - CentOS7 and earlier

Models:

• Filesystem storage - overlay2 and aufs - inefficient for heavy workloads
• Block storage - devicemapper - efficient for heavy workloads
• Object storage - Flexible and scalable

All the data of the images and containers are stored at /var/lib/docker/