First of all what essential thing do you want to know like only DNS? Then you can manage DNS with cyber panel for that check. 1 - Manage DNS
Use your host file to check sites preview on your browser.
Don’t update DNS for the sites you want to be on the old server and update only you want to be on the new server.
Hostname will work on 8090 and you can host site on it as it will work on 80 and 443
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