Hi @iamnarendrasingh ,
Do not have enough words to say thanks for this help. This resolved my issue and I am finally into my ODK Central account.
Yes, this helped a lot. Thanks to @yanokwa and @Saad for your support.
I well documented my steps to install ODK on AWS. @yanokwa I can share with you in case you think that will help in writing AWS installation guidelines.
Thanks everyone once again,
Imran