how to keep active directory replication master domain

[solom1335]

Dear: Support 

I have domain controller main then i replicate 2 server from main domain so now i need to shutdown old one and keep the new replication the master so how to configure that   because when i shutdown old one i can't join new user to active directory  because the old one shutdown .

Kind Regards  

[#2]

Please run;

Dcdiag /v /c /d /e /s:%computername% >C:\dcdiag.log
repadmin /showrepl >C:\repl.txt
ipconfig /all > C:\dc1.txt
ipconfig /all > C:\dc2.txt
ipconfig /all > C:\dc2.txt

then put `unzipped` text files up on OneDrive and share a link.