Linux Proxy setting
Most of company have proxy server and have to route through it for access internet. Though the browser and the system can set proxy by UI, yum and apt need addition setting from the config file. Since CentOS and Ubuntu are both used wildly, I record the step for seeting up proxy config file for future used. Ubuntu 16.16 create a apt.conf file Acquire::http::proxy "http://proxy:port/"; Acquire::https::proxy "https://proxy:port/"; Acquire::ftp::proxy "ftp://proxy:port/"; Acquire::socks::proxy "socks://proxy:port/"; and put it in to the /etc/apt CentOS 7 modified /etc/yum.conf proxy=http://proxy:port and... Done~! This is the very simple tutorial for general situation. If u need more complex setting please google it. Thanks~