方法一:

export http_proxy="proxy:portnum"

 

方法二:(http://www.fedoraforum.org/forum/showthread.php?t=742

create the following files in /etc/profile.d, and then this will work in *any* shell for *any* user of the system

#proxy.sh
export http_proxy=http://host.com:port/
export ftp_proxy=http://host.com:port/
export no_proxy=.domain.com
export HTTP_PROXY=http://host.com:port/
export FTP_PROXY=http://host.com:port/
#proxy.csh
setenv http_proxy http://host.com:port/
setenv ftp_proxy http://host.com:port/
setenv no_proxy .domain.com
setenv HTTP_PROXY http://host.com:port/
setenv FTP_PROXY http://host.com:port/

 

在/etc/yum.conf中设置proxy,prox_username和proxy_password选项。