Regarding the NS servers for the domain, there are two ways of configuring them:
- Using external DNS servers, for example, "sdns2.ovh.net". This is always the most easy alternative.
- Using DNS servers with hostname inside your own domain, for example, "ns1.purebusinesslogic.com". With a quick overview of the DNS hierarchical structure, it would be impossible to resolve "ns1.purebusinesslogic.com" using nameserver "ns1.purebusinesslogic.com", as the nameserver IP address will never be resolved, because of an infinite loop. For such cases, there is the option to add the so called GLUE records, which are stored on the parent zone "com.". That wway, when a DNS resolver finds the name server inside the same domain, it will ask for those nameservers IPs to the parent zone nameserver.
Both configurations are valid and fully functional, And it's even possible to mix them. You can have "ns1.purebusinesslogic.com" as primary DNS, and "sdns2.ovh.net" as secondary. Of course, in such case, you may only need to create glue record for ns1, not for the OVH one, as that one is under another domain.
If you want such mixed configuration, you may follow instructions here:
https://support.godaddy.com/help/art...osts?locale=en (GoDaddy reffers to "glue records" as "hosts"). There, first delete all the "hosts", and then create a single one for "ns1.purebusinesslogic.com" with the IP of your VPS. Then, you follow instructions here:
https://support.godaddy.com/help/art...h-us?locale=en, and set the nameservers for your domain to "ns1.purebusinesslogic.com" and "sdns2.ovh.net". That's all to do with GoDaddy.
Then, on your VPS, you must configure the nameserver itself. Here is an example zones file.
purebusinesslogic.com IN SOA ns1.purebusinesslogic.com webmaster.purebusinesslogic.com (2015050403 10800 3600 604800 10800)
purebusinesslogic.com IN NS ns1.purebusinesslogic.com
purebusinesslogic.com IN NS sdns2.ovh.net
purebusinesslogic.com IN MX 0 mail.purebusinesslogic.com
purebusinesslogic.com IN TXT "v=spf1 +a +mx -all"
purebusinesslogic.com IN SPF "v=spf1 +a +mx -all"
ns1.purebusinesslogic.com IN A 167.114.184.70
mail.purebusinesslogic.com IN A 167.114.184.70
With that, your zone may work without problems. Of course, you may need to add any other hostname you may need, such as "www".
About the PTR record, it's the reverse DNS record. It's managed by OVH, and you can change it from the Manager, on the "IP" section to the left, click on the gear icon to the right of your VPS IP, and click on "Modify the reverse". Then, on the popup, type "mail.purebusinesslogic.com." (watch the dot at the end). That will do it.