Configuring http proxy in the linux Server

Open the .bash_profile file for editing.

(example: vi ~/.bash_profile)
Add the following lines to the end of the file:
http_proxy=http://proxy_server_address:port
export no_proxy=localhost,127.0.0.1,192.168.0.34
export http_proxy
http_proxy should be the ip address or hostname, plus the port of your proxy server
no_proxy should be any exclusions you want to make – addresses that you don’t want to send via the proxy.
NOTE: This must be done for each individual user, including root.
If you don’t want to log out of your shell session, you can reload the bash profile with the following:
source .bash_profile

Configuring YUM to use proxy
To configure “yum” to use the HTTP / HTTPS proxy you will need to edit the /etc/yum.conf configuration file. Open /etc/yum.conf in your favorite editor and add the following line.
proxy=http://proxy_server_address:port

Save and close the file, then clear the cache used by yum with the following command:
yum clean all