On CentOS the configuration file for Docker is at:
/etc/sysconfig/docker
用 root 權限打開 text editor
sudo gedit
注意 加引號
Adding the below line helped me to get the Docker daemon working behind a proxy server:
HTTP_PROXY=“http://<proxy_host>:<proxy_port>”
HTTPS_PROXY=“http://<proxy_host>:<proxy_port>”
保存配置后，重啟 docker
sudo service docker restart
參考
https://stackoverflow.com/questions/23111631/cannot-download-docker-images-behind-a-proxy
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