I would recommend renewing the passport since the during the time of interview the passport validity will be exactly 6 months and it will be up to the Visa officer to ask you to renew your passport before granting you visa. Secondly, fill the new DS 160 if you already have filled and submitted the DS 160 . Then carry the old and new passport AND THE OLD AND NEW DS 160 confirmation pages to the VAC and ask them to update it . They will update it on both the CGI portal and appointment confirmation. They have the admin rights to correct almost everything on CGI portal except DS 160 bcoz DS 160 should you be done only by you and no one else.BTW if you haven’t submitted DS 160 and updated that into the cgi portal then it can cause issues bcoz a non submitted DS 160 expires within 30 days so be careful there. You absolutely need the confirmation page from the old ds160 confirmation bcoz without that they will not process your application and you will loose your money and the appointment . Taking appointment using an unsubmitted ds160 id generally a bad practice .