Final answer:
The default storage driver for Docker in CentOS is devicemapper. It is important to check the specific CentOS and Docker versions as defaults can vary with time and system requirements.
Step-by-step explanation:
The default storage driver in CentOS, particularly for Docker, is devicemapper. Different storage drivers in Docker provide a way for containers to store and manage their data. While aufs, overlay2, and btrfs are also commonly used storage drivers, devicemapper is often the default choice in CentOS due to its direct compatibility with the underlying Linux kernel and device mapping technologies.
However, it is always recommended to check the current configuration as defaults can change based on the version of CentOS and Docker, and other factors such as performance requirements and system capabilities.