Failed to start Docker daemon
Docker daemon failed to start after run
yum update -y command on CentOS 7.
OverlayFS is a modern union filesystem that is similar to AUFS, but faster and with a simpler implementation. Docker provides two storage drivers for OverlayFS: the original overlay, and the newer and more stable
This topic refers to the Linux kernel driver as OverlayFS and to the Docker storage driver as overlay or overlay2.
Note: If you use OverlayFS, use the overlay2 driver rather than the overlay driver, because it is more efficient in terms of inode utilization. To use the new driver, you need version 4.0 or higher of the Linux kernel, or RHEL or CentOS using version 3.10.0-514 and above.
systemctl status docker
systemctl restart docker