You may access repositories through standard web proxy servers. If your system is connected to the Internet through a web proxy server, specify the proxy server details in /etc/yum.conf. The proxy setting must specify the proxy server as a complete URL, including the TCP port number. If your proxy server requires a username and password, specify these by adding proxy_username and proxy_password settings.

The settings below enable yum to use the proxy server mycache.mydomain.com, connecting to port 3128, with the username yum-user and the password qwerty.

# The proxy server - proxy server:port number
proxy=http://mycache.mydomain.com:3128
# The account details for yum connections
proxy_username=yum-user
proxy_password=qwerty

	Global Settings
	If you define a proxy server in /etc/yum.conf, all users connect to the proxy server with those details when using yum.

To enable proxy access for a specific user, add the lines in the example box below to the user's shell profile. For the default bash shell, the profile is the file ~/.bash_profile. The settings below enable yum to use the proxy server mycache.mydomain.com, connecting to port 3128.

# The Web proxy server used by this account
http_proxy="http://mycache.mydomain.com:3128"
export http_proxy

If the proxy server requires a username and password, add these to the URL. To include the username yum-user and the password qwerty, add these settings:

# The Web proxy server, with the username and password for this account
http_proxy="http://yum-user:qwerty@mycache.mydomain.com:3128"
export http_proxy

	The http_proxy Environment Variable
	The http_proxy environment variable is also used by curl and other utilities. Although yum itself may use http_proxy in either upper-case or lower-case, curl requires the name of the variable to be in lower-case.