How to setup docker behing a HTTP proxy
mkdir /etc/systemd/system/docker.service.d
sudo touch /etc/systemd/system/docker.service.d/http-proxy.conf
Add proxy info
[Service]
Environment="HTTP_PROXY=http://emea-proxy.uk.oracle.com:80"
Environment="HTTPS_PROXY=http://emea-proxy.uk.oracle.com:80"
Restart and flush
sudo sysetmctl daemon-reload
sudo systemctl restart docker