Frequently Asked Questions — DNS
What is a nameserver?
In their simplest form, nameservers match domain names to IP addresses and share your server's domain names and IP addresses with the Internet. Without nameservers, potential visitors can only access your server and its websites by IP address.
- When a visitor enters a URL into a browser, the computer queries the nameserver for the IP address that corresponds to the domain name that the visitor specified.
- Once the visitor's computer has this information, the browser will be able to access the website requested.
Nameservers also share information with other nameservers. This allows visitors to quickly and efficiently access websites that are hosted by your server.
- This concept is called propagation.
- When you first set up a website, its DNS information may take up to a few days to propagate throughout the Internet. This delay means that some visitors may be temporarily unable to access the website.
What is the difference between DNS software and DNS records?
DNS records are the resources within a zone file that map domain names and other services to their IP addresses. A DNS record can specify which mailservers exist for a given domain.
- These records also identify which nameservers contain authoritative information about your domains and services.
- Important: Your server's local zone files must match the domain information that you specified to the registrar.
The nameserver software on your server manages nameserver records.
- cPanel & WHM offers three nameserver software options: BIND, NSD, and MyDNS.
- Note: MyDNS nameserver software is only available in cPanel versions 11.32 and later.
Why do I have to update nameserver records at the registrar?
When you update your nameserver records at the registrar, the registrar can push your domain's DNS information to their DNS namespace.
What is an authoritative nameserver?
Authoritative nameservers return responses to queries for one or more zones.
- An authoritative nameserver does not cache DNS information for related domains.
- Responses from authoritative nameservers are known as authoritative answers.
- You can configure an authoritative nameserver to return authoritative answers for some zones while it caches information for other zones.
What are the differences between local, private (custom), clustered, and remote nameservers?
- Local — Local nameservers are authoritative nameservers hosted by the same server that hosts corresponding cPanel accounts.
- Clustered — Clustered nameservers are part of a collection of nameservers that all have authoritative nameserver status and share information amongst themselves. These nameservers are used to prevent down time. If one server fails, then additional servers are available to pick up the slack.
- Private or Custom — This type of nameserver is a custom-branded or vanity alternative name for the authoritative nameserver.
- Remote — Remote nameservers are authoritative nameservers that are hosted on a separate server from the website.
What is the difference between clustering and running the default local nameserver setup?
You can cluster software to ensure that all nameservers in the cluster contain the same information. Clustered software will also share DNS information with servers that are external to the one that actually hosts the website.
- Some registrars require this configuration, but most do not.
- In larger server deployments, you can offload DNS to a cluster configuration to lessen the load on the local sever as well.
- For more information about how to deploy a cluster within WHM, read our Configure Cluster documentation.
Do I need to use DNSONLY to cluster?
- You can cluster several cPanel & WHM servers without DNSONLY.
- You can also configure BIND to cluster with non-cPanel & WHM servers. We do not support this configuration.
Where are my DNS zone files stored?
On cPanel servers, zone files are stored in the
directory, regardless of the selected nameserver software.
Why is the information about WHM's Nameservers IP feature incorrect?
The functionality of this feature has changed as of cPanel & WHM 11.30.
Topic revision: r2 - 23 Sep 2013 - 15:01:06 - Main.StacyWyatt