Install Docker on Raspberry pi

#install && start docker
sudo apt install wget -y
wget https://download.docker.com/linux/debian/dists/stretch/pool/stable/armhf/docker-ce_18.09.5~3-0~debian-stretch_armhf.deb
wget https://download.docker.com/linux/debian/dists/stretch/pool/stable/armhf/docker-ce-cli_18.09.5~3-0~debian-stretch_armhf.deb
wget https://download.docker.com/linux/debian/dists/stretch/pool/stable/armhf/containerd.io_1.2.5-1_armhf.deb

sudo dpkg -i containerd.io_1.2.5-1_armhf.deb
sudo dpkg -i docker-ce-cli_18.09.5~3-0~debian-stretch_armhf.deb
sudo dpkg -i docker-ce_18.09.5~3-0~debian-stretch_armhf.deb