Configure yum with proxy server on RHEL/OL/Fedora

When using yum to maintain packages on hosts running Red Hat Enterprise Linux (RHEL), Oracle Linux (OL) or Fedora, you may have to configure proxy option if the host is running behind firewall.

In order to do that, add following lines to yum configuration file /etc/yum.conf

proxy=http://<proxy server>:<port>

proxy_username=<user name>

proxy_password=<password>

Here, 

  <proxy server> is the host name or IP address of proxy server

  <user name> user name if proxy server requires

  <password>  password if proxy server requires

File /etc/yum.conf  example

gpgcheck=1

installonly_limit=3

clean_requirements_on_remove=True

best=True

skip_if_unavailable=False

proxy=http://proxy.dbaplus.ca:8080

proxy_username=user01

proxy_password=user01pwd