/etc/systemd/system/docker.service.d/http-proxy.conf
Environment="HTTP_PROXY=http://ip:port" "NO_PROXY=localhost,*.ibm.com,192.168.0.0/16,127.0.0.1,10.0.0.0/8"
/etc/systemd/system/docker.service.d/https-proxy.conf
Environment="HTTPS_PROXY=https://ip:port" "NO_PROXY=localhost,*.ibm.com,192.168.0.0/16,127.0.0.1,10.0.0.0/8"

systemctl show --property=Environment docker