DNS server, please explain

Started by land_driver, Aug 22, 2022, 04:29 AM

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land_driverTopic starter

Hello.
I'm trying to figure out how to host a website on a server.
As short as possible:

1. Rented a web server from ubuntu to digitalocean.com.
2. I bought a domain.
3. On the registrar site, instead of their own Dns-servers, they indicated third-party ones (namely, ns1.zilore.net and ns2.zilore.net).
4. In the control panel, zilore added an a-record for his domain in which he indicated the ip of his web server.
5. I ping my domain from Windows - not the ip of my web server is displayed.

I thought that changing the dns servers would not take effect immediately, but a day has passed and still the ping is not going to my server.

Actually the question is: what do I not understand in the whole chain and why is there no request to my server? Please help me figure it out)

And an additional question: why can a dns-server for a domain (or should it?) be specified not only on the domain management site  but also on the web server management site? That is, on the digitalocean website where I took the server, there is a section where you can (or do you still need to?) Add a domain and register dns (or ns) servers for it and add the same A-records of the correspondence between Ip and the domain as zilore. generally, I'm confused about how everything works and I will be very grateful if you help me understand. Thank you.
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Movut

Wait a little more. The problem may not be on the side of the DNS host, but on the side of your ISP. If that doesn't work, try using your registrar's DNS hosting, it's free, although the registrar tends to crash once a year with all of its servers, including DNS.

In the server control panel or in the hosting control panel on the server itself (is there also a hosting server client panel)? In the first case, you specify the domain name as the server name for OS installation, etc. In the second, you link the domain to a specific site / directory on the server, because there can be a huge number of such websites on the server. If this is not done, the server will use the "default site" (more often they say "default virtual host") to process requests, which is not the best option for a regular website.

The server control panel and the hosting service's client panel can be a single entity.

You can try proxy. Perhaps, somewhere, a request to your site for a domain has been "resolving" for a long time.
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Yura

#2
Do as advised above, you can wait for some more time. Most likely, your Internet service provider has the problem. You can call technical support and consult. The administration should work 24/7. In the future, it is better never to use another company for DNS hosting. It is optimal to use either a registrar or a hoster. another company's dns hoster may be needed only in certain situations.
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himachaldesk

In a nutshell and without deciphering abbreviations and Wiki links, DNS is a technology that allows you to write site names in a human—readable language in the browser search bar, and the browser to find the desired web site and display it.
DNS is engaged in converting site names — domain names that are entered into the browser search bar into the IP addresses of specific servers. If there were no DNS, you would have to remember the IP addresses of the resources you need and enter them manually into the browser.
Well, we figured out the general principle of operation, but the question arises: where does DNS get information from? There are millions of sites, where is all this information stored?

Information about domains and their connections to IP addresses are located in a distributed database that is stored on DNS servers that form a hierarchy. DNS uses a TCP/IP stack, TCP or UDP port 53 to work. DNS server is a combined concept that implies software that is responsible for processing a DNS query and the "iron server" itself.

When you enter a query in the browser search bar, for example, dnray.com — the browser will first check for the presence of a DNS record on your local computer in the hosts file, if there is no desired address, the request is sent further to the local DNS server of the user's Internet provider, if there is no record there, the request goes higher to the geographical servers zones.
As soon as the necessary DNS record is found, the browser receives the IP address to which it sends the request.
A web page comes in response. Graphically , this process can be depicted as follows:

It turns out that the DNS query rises from the local data stores to the top level, which is faster than making a request first to the root DNS server and going down.
In addition, there is a nuance — it is not the browser that polls the DNS servers of the second, upper and root levels, but the local DNS server - resolver.
Resolver finds domain information, returns it to the browser and writes the data to the cache for 24 hours. It is from here that the DNS records update time can take up to 24 hours. But this is a very useful action, because the next time you access this site, resolver will simply return data from the cache and the site will load faster.
By the way, the history of the hosts file is quite interesting. Previously, this was the only way not to remember IP addresses. Now the hosts file is mostly a historical vestige, which is used, perhaps, only for testing and development purposes.
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