In the next two weeks I will buy a Dedicated Server because my reseller account is full. I have some questions about DNS:
1. Does dedicated server companies provide you with a Master DNS server so you will be able to host your sites?
2. How will I be able to provide my Reseller clients with DNS like these? (ns1.myclient.com etc)
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Usually you need to run the nameserver(s) yourself. Some host may offer backup, however, it is not always possible to automaticly sync that with your client's domains. Best is to use two of your own servers, or if you only have one server: use a simple VPS as secondary DNS. (Primary being your server itself).
Yes you can run both ns1 and ns2 on the same server. However that is not how it is supposed to be setup: Since both nameservers will be unreachable in case of your server being down. Which means lost mail, unreachable websites and such.
A $15/month VPS account somewhere should be enough to run the CPanel DNS (special DNS-only version of Cpanel). Which will make sure always one of your nameservers will be online. And thus that mail can temporarily be saved @ the VPS, a temporarily "we are down because of X" page can be setup, stuff like that
If you just get a control panel you'll be fine. They all run DNS on the same server, and it works just fine.
Ideally you'd have separate machines on separate Class "C"s but the control panels don't do it.
What you need to do is decide what domain you want to use. When you get the new server, take two of the IPs (doesn't matter which, you can still use them for hosting, SSL, etc) then go to where you registered that domain, and register two name servers using those two IPs.
You make the "A" entries in your control panel and you're done. Now you don't have to rely on anyone's DNS, and you can give out those name servers to your customers. The exception to the rule is if cPanel doesnt automatically set your IPs to respond to DNS queries. I don't know because I don't use it. Plesk does, but Ensim doesn't. etc etc. Even if they don't it's a simple step to change.
You don't need a separate VPS; if your primary machine (which hosts web, email, etc etc.) goes down, it doesn't matter how many DNS servers you have. Your services are still unreachable.
Most MTAs will bounce e-mail immediately in the event of a DNS lookup failure, but will defer email and at least attempt delivery a few times for a successful lookup followed by a connection failure. In the event of an extended outage, having a DNS server with established glue records and a working web server could prove handy. The benefits are peripheral, but they are there.
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