Testing whether a proxy is set
This command will show if there is a proxy server configured on the system:
echo $http_proxy
Proxy setting for command line programs
The http_proxy environment variable is used to specify proxy settings to client programs such as curl and wget.
No username and password required:
export http_proxy=http://SERVER:PORT/
Username and password authentication:
export http_proxy=http://USERNAME:PASSWORD@SERVER:PORT/
Domain, username and password required:
export http_proxy=http://DOMAIN\\USERNAME:PASSWORD@SERVER:PORT/
Special character handling:
Literal backslash characters (\) need to be doubled:
export http_proxy=http://DOMAIN\\USERNAME:PASSWORD@SERVER:PORT/
When the username or password uses the @ symbol, add a backslash (\) before the @ – for example:
export http_proxy=http://DOMAIN\\USERN\@ME:PASSWORD@SERVER:PORT
or
export http_proxy=http://DOMAIN\\USERNAME:P\@SSWORD@SERVER:PORT
Making this permanent
For bash and sh users, add the export line given above into a new file called /etc/profile.d/http_proxy.sh file:
# echo "export http_proxy=http://proxy.example.com:3128/" > /etc/profile.d/http_proxy.sh
For csh and tcsh users, use the following command to set the http_proxy variable in a new file called /etc/profile.d/http_proxy.csh file:
# echo "setenv http_proxy http://proxy.example.com:3128/" > /etc/profile.d/http_proxy.csh
The extension of these files determines which shell will read them. The commands are not interchangeable.
Other programs
yum
To configure yum to use a proxy, modify the /etc/yum.conf file with the following :
proxy=http://proxy.example.com:3128
proxy_username=yum-user
proxy_password=qwerty
subscription-manager
To configure subscription-manager to use a proxy, modify the /etc/rhsm/rhsm.conf file with the following:
proxy_hostname=proxy.example.com
proxy_port=3128
proxy_username=yum-user
proxy_password=qwerty
RHN programs (e.g. rhn-register, up2date):
Modify the /etc/sysconfig/rhn/up2date file with the following:
httpProxy=proxy.example.com:3128
If authentication is required, use:
httpProxy=proxy.example.com:3128
proxyUser=yum-user
proxyPassword=qwerty
enableProxy=1