Install required packages, these packages are pre-requsite for docker installation on CentOS:

sudo yum install -y device-mapper-persistent-data lvm2

Add the Docker CE repo:

sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

Install the Docker CE packages and containerd.io:

sudo yum install -y docker-ce-18.09.5 docker-ce-cli-18.09.5 containerd.io

Start and enable the Docker service:

sudo systemctl start docker
sudo systemctl enable docker

Add test_user to the docker group, giving the user permission to run docker commands:

sudo usermod -a -G docker test_user

Log out and back log in and test the installation by running a simple container:

docker run hello-world