[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.com
After=network.target docker.socket
Requires=docker.socket

[Service]
ExecStart=/usr/bin/docker -d -H fd://
LimitNOFILE=1048576
LimitNPROC=1048576

Environment="http_proxy=http://user:password@host_proxy:80/"
[Install]
WantedBy=multi-user.target