Date

Ensure you have docker installed.

# yum install -y docker

Set the docker storage driver to overlay by editing /etc/sysconfig/docker-storage and setting the DOCKER_STORAGE_OPTIONS variable.

DOCKER_STORAGE_OPTIONS= --storage-driver=overlay

Restart docker.

# systemctl restart docker

Confirm that the storage driver is set to overlay and the backing filesystem is extfs.

# docker info
...

Storage Driver: overlay
 Backing Filesystem: extfs

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