Yum Command Failing With Error "Could not resolve host: yum.$ocidomain; Name or service not known"

 I got this error , while trying to install a package. The error says "https://yum.$ocidomain/repo/OracleLinux/OL7/addons/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: yum.$ocidomain; Name or service not known"

Trying other mirror.". 

Could not resolve host: yum.$ocidomain

There are coule of workarround for this issue:

Workarround 1:

• Check the content of /etc/yum/vars/ociregion
  

# cat /etc/yum/vars/ociregion

• Make this file empty "/etc/yum/vars/ociregion" If you have a "-" in that file, which should not be there, empty the file with th commands below

# > /etc/yum/vars/ociregion

• Test the yum command again to make sure it works.

Workarround 2:

Please create these three files and Manually make an entry for Region,domain in them. Please replace region with your values.

#echo oracle.com > /etc/yum/vars/ocidomain

#echo us-ashburn-1 > /etc/yum/vars/region

#echo -us-ashburn-1 > /etc/yum/vars/ociregion

yum Domain and region entry

Please share  and comment if it helps.