How to configure proxy for YUM in RHEL, CentOS ?

In most of the data center direct Internet connection is not allowed on Unix and Windows Servers. If we need to download anything from Internet we have to go through via some proxy servers. In case of Linux Servers whenever we need to install new packages and apply patches in such scenarios we have to set proxy for yum command. ----------------------------------------------------------------------------------------------------- # The proxy server - proxy server:port number # The account details for yum connections proxy_username= proxy_password= -----------------------------------------------------------------------------------------------------