Docker is a utility to pack, ship and run any application as a lightweight container.

Add current user to docker group:

sudo gpasswd -a [user] docker
newgrp docker
 
docker info  # test its working

Using socks5 proxy (systemd only):

sudo mkdir /etc/systemd/system/docker.service.d
sudoedit /etc/systemd/system/docker.service.d
sudo systemctl daemon-reload
sudo systemctl restart docker

/etc/systemd/system/docker.service.d

[Service]                                                                       
Environment="ALL_PROXY=socks5://localhost:1080"