What is DNS? Why change DNS when changing hosting?

Briefly: If fault tolerance and availability of the site at any time come first, then the best solution there will be paid DNS (for example, Amazon). Paid services also suitable if attackers are DDoSing your nameservers.

If you don't want to depend on third party companies and manage DNS yourself, your choice - own servers names Responsibility for their performance lies with you.

If you don’t want to deal with placement and configuration issues, and short-term failures are not critical, then your choice is free DNS or a DNS provider.

What is a DNS server and what are they?

DNS server(NS, Name Server, name server) is responsible for converting a domain name to an IP address. Using the IP address, the browser opens the requested website.

Example of domain to IP address conversion

website → 80.87.203.35

There are several options for hosting DNS servers:

Usually you use your own servers or hosting servers. Let's consider the options in more detail, identifying the advantages and disadvantages of each of them.

Provider DNS server

When purchasing a server, hosting providers can provide free servers names (both primary and secondary). This option is suitable for those who don’t want to bother: when you add a domain in the control panel, the remaining parameters are configured automatically (this is how it works on our hosting).

The main disadvantage is that hosting providers provide DNS services with basic functionality. They cope with the basic task (domain to IP translation), but additional functionality (API, IPv6, DDNS, Geo Routing) is missing or reduced.

All clients use common nameservers. If a strong one is ordered on the NS of one of the clients DDoS attack, then all other clients may experience disruptions. Despite this, hosting companies try to protect their DNS from DDoS.

Easy to set up

There is no need to monitor the state of the DNS server

Free

– The service may not be available on all hosting sites

– Impossibility API usage

– Possible malfunctions

Own DNS server

Suitable for owners of virtual and dedicated servers. The client hosts the DNS on its own server, usually on the same server as the site.

Setting up using the panel. Most control panels support setting up nameservers. FirstVDS clients use the ISPmanager panel, which has this feature - see the setup guide.

Self-configuration. You can configure name servers without a control panel. To do this, just install a DNS server program (for example, BIND) and create configuration file according to the model. See setup guide for popular operating systems. Don't forget to open port 53 for TCP and UDP packets!

DNS server and DDoS protection. If you use DDoS protection services, it is not recommended to host the DNS service and website on the same server. DDoS protection services can block all UDP traffic in case of strong attacks, and clients cannot access the name server - the site will be unavailable by domain name. In this case, DNS should be located on a separate server.

Independence from third party resources

Opportunity DNS settings for yourself and use your own scripts

Free

– Requires 2 IP addresses

– Difficulty setting up

– Independent performance support

– Possible problems if DDoS protection is used

Registrars require that each domain have at least two name servers: a primary (master) and at least one secondary (slave). The addresses must be two different IP addresses.

To satisfy this requirement, an additional IP address is connected to the server. The main address is indicated as the primary NS, and additional address- as a secondary NS.

Free DNS hosting

Free DNS hosting - good decision, if you do not have the ability to administer the DNS server yourself. But be careful: often in conditions free services disclaimer is stated. There may be restrictions on the number of domains and the number of requests per month. Posting commercial projects may be prohibited. Study the terms and conditions of the chosen service well.

Free

The ability to find a service that suits the conditions and capabilities

– Not responsible for performance

– API is missing or inconvenient to use

– Restrictions on allocated resources

Paid DNS hosting

Paid DNS hostings, unlike free ones, guarantee a level of service and provide a set of additional features. Amazon Route 53 stands out among others. This DNS hosting is positioned as fault-tolerant and highly available. It has the transfer of existing settings from other servers and a full-fledged API for which many ready-made recipes have been written.

fault tolerance

Full API

Additional functionality

– Payment

Why do you need an API on DNS hosting?

The most common application is to create a fault-tolerant system. For example, we have two servers. Server A is the main one, it hosts the site that visitors access. Server B is a backup server; it stores an up-to-date copy (replica) of the main site.

Let's imagine that we rent a paid DNS server. If the site is working in normal mode, then the data is sent from server A. A script runs on server B that checks the availability of the site to server A. If it stops working, the script uses the API to access DNS hosting and writes the IP address of server B to the A record. The site continues work from a backup server.

Since the switching occurs with minimal delay, visitors will not notice the switch.

CDN proxy

CDN proxies (Content Distribution Network) stand out, which can also be used as DNS. The most popular is CloudFlare. CDN proxies speed up website performance by caching data on a distributed network of servers. The site is served to the client from the server closest to him. CDN can also filter malicious requests (protect the site from DDoS).

CDN networks have a serious drawback: the IP address for domains hosted in the CDN is assigned randomly. Those. it will be impossible to access the site or server directly using the IP address.

In addition, the site may be blocked in the Russian Federation. IP addresses of sites with prohibited content are blacklisted by Roskomnadzor and blocked by providers (and this is not uncommon for CDN networks). If your domain accidentally gets one of these addresses, the site will be unavailable. For this reason, it is necessary to carefully select a CDN provider and find out in advance about blacklisted IP addresses and possible problems with them.

Increasing the speed of content delivery

Protection against malicious requests

Ease of use

fault tolerance

– IP addresses may be on Roskomnadzor blacklists

Hello, dear readers of the blog site. Let's talk today about the location of your sites on web servers (). This is done, naturally, so that any visitor from anywhere in the world connected to the Internet can access your resource.

The principles of hosting websites on the Internet have remained unchanged for more than two decades, but nevertheless this does not simplify the task of those who plunge into the world domains, hosting, DNS servers and IP addresses first.

Today I will try to talk about this in as much detail as possible in one article, but without being distracted by specific examples checking and purchasing a domain name and renting hosting. I have already written about this and will simply refer to the available materials. Our task in this particular publication will be to identify the relationship between all these shamanic actions and understand why all this needs to be done at all.

Domains, IP addresses and DNS servers connecting them

So, first of all, we will need to place our documents in a certain address space (under the general name - ). This address space will be accessed using (was invented by Tim Berners-Lee, like many others). You can read more about URLs at the link provided, and I’ll use an example to remind you where the dog rummaged (do you know?). Let's look at this URL:

https://site/seo/search/rambler-ru-poiskovaya-sistema.html

This familiar type can be divided into several parts:

http:// - indication of the protocol through which data will be exchanged (for example, between a browser and a web host -), and also Special symbols which are usually used (://)
website—indication of the domain name that will be accessed
/seo/search/rambler-ru-poiskovaya-sistema.html - indicating the path in this address space (website) to some document

Moreover, we must understand that the domain name record itself (site), which is part of the URL we are studying, has absolutely no meaning for machines (web servers), because they operate exclusively with IP addresses.

Domain names serve two main purposes:

ease of remembering the address space (IP is more difficult to remember)
the ability to transfer your resource to different hostings, where it will be provided with different IP addresses, and at the same time not change the URLs for accessing site documents. It is precisely for the implementation of this task that they are used, which we will talk about below in the text.

Nowadays, the Internet mainly uses the IPv4 standard, and the digital address in this case consists of four bytes, i.e. it can assign approximately four billion unique hosts. IPv6 will soon be introduced everywhere, which will solve all possible problems with the lack of digital addresses. Well, to assign correspondence between IP (digits) and domain names, as we said a little earlier, it is used DNS system.

DNS (Domain Name System) is a special service hierarchy of servers that contain information about which IP address is hidden behind which domain.

Consequently, when you access a specific site through a browser (or any other program) by entering its URL (for example, https://site), your computer first of all turns to the nearest DNS server with a question about What digital address does this resource live at? And only after receiving the required IP from the DNS server (109.120.169.66 - you can paste it into the address bar of your browser and make sure) the request will be sent directly to the site itself.

Those. There is a certain delay when accessing any site from your computer, which is not good. But now they are already able to cache the received data and do not make repeated requests to DNS. Probably now the meaning of my fuss with hosts file, described just above.

Since we practically do not see the IP when accessing a resource, they will interest us to the extent that. And here domains are of much more interest to a webmaster, because they are the very visible part that identifies the address space.

What are domain names (domains) and what are they?

If you look closely, you will notice that the domain names are separated by dots (at least one, yes). Using the example of my blog domain (oh, how long it took me to select it):

Website

The points are separated by the so-called domain name levels, which you need to start counting from right to left. In the example given, ktonanovenkogo is a second-level domain, ru is the first. If I had a forum, it is quite possible that it would live on a third-level domain name:

Forum.site

First level domains are divided into two groups:

Cctld (country code top-level domain) - first-level domains assigned to countries.

Russia has this moment There are as many as three first-level domain zones:
1. su - a rudiment left over from Soviet Union and now representing the resource space in Russian
2. ru - originally assigned to Russia
3. RF - Idn addresses (internationalized domain name), when it is possible to use characters from national languages (in our case, Russian) in the domain name. In fact, their names are still written in English characters (recoding occurs), but we just don’t see this. If you enter the address in your browser: http://ktonanovenkogo.rf/
  and after going to this site, copy its address from address bar, then you will get completely indigestible nonsense:
  Http://xn--80aedhwdrbcedeb8b2k.xn--p1ai/
In any country there is a number of domain name registrar companies, which are in charge of the distribution of second-level domains in these same national zones (Cctld). If you want to find out which companies have the right to sell them in Russia, you will need to go to the coordination council page - cctld.ru.
There are not many such companies, but they can have a whole network of resellers(partners) who will engage on their behalf. If you are not satisfied with the current reseller in some way or you have problems with it, then by contacting the registrar, you can choose another reseller or go directly under the wing of the registrar.
Resellers' prices for domains (retail), as a rule, are several times lower than the prices of registrars (wholesalers), and at the same time I did not find any visible reasons be wary of buying cheaply from the former, rather than overpaying for the same service from the latter. If you are interested, you can read about the description of the process of purchasing a domain name from, which I myself use.
Gtld (generic top-level domain) - domain names that are in general use, regardless of the country in which the webmaster lives.

You can buy domains in the zones .com, .net, .org, .info, .biz and .name without any restrictions. In the .edu, .gov and .mil zones, this opportunity is provided only for institutions, as well as state educational and military institutions. There are also a number of specialized first-level domains, for example, .travel, .jobs, .aero, .asia.
Second-level domain names in these public zones (not only national ones), which, in fact, are used by some resources that may have conflicts with copyright holders. The same torrent was forced to move to the public zone org, because its resource was blocked in the national domain zone ru.

Buying and renewing domains - what, where, how much?

By making a purchase from any registrar, you receive the rights to use it for one year. After this period, you will have to pay it again. If this does not happen, then within a month the specified domain name will be available for registration and anyone can purchase it (be careful and always enable auto-renewal of domains in your registrar’s panel).

Check if the domain you are interested in is occupied It will be possible on the website of any registrar or reseller, but it is usually recommended to do this on the resources of official registrars in order to avoid interception. For example, on reg.ru (you can enter the expected domain name directly into the form below):

You can check not only the RU domain zone for occupancy, but also all others - suddenly “vasy-pupkin” turns out to be unoccupied somewhere else. By the way, you need to know that for all zones except Idn can only be used combinations of Latin characters and some valid characters (,,,[_],[-]):

As you can see, employment is not displayed in the Russian Federation zone and this is due to the fact that the Latin alphabet cannot be used in the names of such domains. However, not all national Idn zones have this rule, which makes life easier.

If you are only interested in zones common use, then you will need to go to the “International” tab:

Each registrar in different countries the world will decide for itself how much it will cost it to support your rights in these domain zones(it is necessary, for example, to maintain a staff of translators, because the level still leaves much to be desired) plus the degree of his greed in determining his margin.

In addition to national (Russian in the case of nik.ru) and public zones with many registrars and resellers, both in Russia and in the world, you will find the opportunity to check and register in the national zones of some particularly cunning countries. In the case of nik.ru, you will get this opportunity on the “Foreign” tab:

These countries have started trading second-level domain names (cctld) in their national zones. For example, the first-level domain zone .tv was not initially intended for sites related in one way or another to television, but was allocated as a national one for a country such as Tuvalu (an island state with a population of ten thousand people). Well, now they are selling domains from their zone left and right, probably making a considerable profit for such a dwarf state.

Thus, when purchasing a domain name you can check in which domain zones it is free. Sometimes, if the registrar is busy, next to the domain name there may be a “Pre-order” link (get on the queue). The required amount for payment will be blocked on your account with the registrar, and if it is released you will be notified about this.

When you buy the domain you are interested in, during the purchase process you will enter into an agreement with the registrar of your choice, and you will also have your own account for working with purchased domains. This is a necessary thing, because it is there that you can register new list so-called NS servers (essentially DNS), taken from the new hoster. By the way, at first, and only then move to a paid one. But I would still think about this (perhaps only for the first time).

By default, when viewing domain information in the so-called, you will find your personal data there, which was necessary to indicate during registration. Personally, I think that this is fraught with possible fraudulent activities, so I try to hide this information in whois in the same registrar’s office (for some this service is paid, for others it is free):

By the way, many hosting companies are also resellers of official Russian registrars and you can buy from them or even receive a domain name as a gift (for example, when you pay for the host for a year). But personally, I prefer not to keep all my eggs in one basket, although I don’t have any compelling arguments about this.

What is hosting and how to choose it

What is hosting? This is the provision of physical space (not address space, which we talked about just above) for your website files.

Well, the connection between the physical and address spaces will be carried out using DNS servers. From the hosting company we buy this very space for files and databases, and its connection with the address. By the way, thanks to DNS servers, it is not at all necessary to order hosting in the country where you live. As a rule, a foreign analogue will be somewhat cheaper than a Russian one, but here a problem arises language barrier when communicating with technical support (at least for me).

Although Lately I really liked it.

Now, probably, all paid hosting services support the ability to use server-side scripts (CGI). In the description of their tariffs you can see the name of the directory for such scripts (something like CGI-BIN). That. software environment will allow scripts written in any language to be run on the server server language programming. The most common is PHP, as well as pearl, ruby, etc.

You can find out which specific languages this hosting supports from its description or by contacting technical support with this question. We are primarily interested in this from the point of view that if there is support PHP and MySql(databases), we can easily use so-called CMS (content management systems).

CMS makes it easy for completely unprepared users to create Internet projects. All texts you add to the site will be stored in databases, and the hosting itself will only host engine files and templates.

Templates for engines will allow you to completely change the design of a website in the blink of an eye without affecting its content, which, I repeat, lives in special tables that form a database (you are provided with a separate disk space for it, which can often be located on another physical server). You can read more about this in the article about.

Features of the CMS is that accessing a document, for example, at:

https://site/seo/smo/google-socialnaya-set-gugl-plyus.html

Of course, when you make adjustments to it, as well as fill it with content, it would be appropriate to regularly create its files and database.

However, on any paid hosting your data will be backed up automatically. The differences will only be in the ease of managing these backup copies, frequency of their creation, as well as time and place of storage (it is better if backup will be stored on another physical server or at least another physical disk).

Any hoster will allow you to create so-called subdomains, i.e. third level domain names. For example, if I had a forum, it is quite possible that it would live on a subdomain:

Forum.site

This will be a kind of subspace within the host space allocated to you. The subdomain will also have its own The root folder, i.e. in fact, these will be additional sites in your address space.

For owners of static resources (not using a CMS), where each web page is a separate file on disk space hosting (not database) may be up-to-date support SSI(Server Side Includes). Web servers with SSI support have the ability to perform on their side when processing a browser request specific set directives before serving the requested document to the browser.

It turns out to be an analogue of some weak CMS, with the help of which, for example, you can do something similar to templates for static sites. In this case, if you want to add new item in the menu, you don’t need to do this in all hundreds and thousands of pages of your Internet project, but only in one file, which will be using include directives connect to all site pages on the web server while processing a browser request.

Those. you endure, for example, left menu V separate file Left.txt, and in all pages where this left menu appears, write the following code:

The path is specified relative to the document where this directive is inserted. I already wrote about it. In the same way, it will be possible to connect other blocks common to many web pages (header, sidebar, footer) for their more quick editing, if needed.

In conclusion, I would like to say that, in general, You don’t have to immediately rush out to buy a domain name and hosting. You can try playing with the site engine and filling it with content on your own computer. You just need to set up a web server on it. This is done quite simply and is described in detail in the article about or more.

Regardless, when using Denver you will not need to download files over the network, hence the speed of working on the project will greatly increase. Well, when you have already played enough and practiced, you will be able to create something you created on local server transfer the site to a completely real hosting, having previously purchased a second-level domain for it.

Good luck to you! Before see you soon on the pages of the blog site

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What is a DNS server, its types

DNS server(NS, Name Server, name server) is responsible for converting a domain name to an IP address. Using the IP address, the browser opens the requested website.

Example of domain to IP address conversion
firstvds.ru → 80.87.203.35

There are several options for hosting DNS servers:

Hosting provider DNS servers
Own DNS servers
Free DNS hosting
Paid DNS hosting
CDN proxy (in DNS mode)

Usually you use your own servers or hosting servers. Let's consider the options in more detail, identifying the advantages and disadvantages of each of them.

Provider DNS server

When purchasing a server, hosting companies may provide free name servers (both primary and secondary). This option is suitable for those who don’t want to bother: when you add a domain in the control panel, the remaining parameters are configured automatically (this is how it works on our hosting).

All clients use common nameservers. If a strong DDoS attack is ordered on the NS of one of the clients, then all other clients may experience operational failures. Despite this, hosting companies try to protect their DNS from DDoS.

Pros:

Easy to set up
There is no need to monitor the state of the DNS server
For free

Minuses:

The service may not be available on all hosting sites
Inability to use API
Possible malfunctions

Own DNS server

Suitable for owners of virtual ones and those who want to buy. The client hosts the DNS on its own server, usually on the same server as the site.

Settings using the panel. Most control panels support setting up nameservers. FirstVDS clients use the ISPmanager panel, which has this feature.

Self-configuration. You can configure name servers without a control panel. To do this, just install a DNS server program (for example, BIND) and create a configuration file according to the example.

DNS server and DDoS protection. If you use DDoS protection services, it is not recommended to host the DNS service and website on the same server. DDoS protection services can block all UDP traffic in case of strong attacks, and clients cannot access the name server - the site will be unavailable by domain name. In this case, DNS should be located on a separate server.

Pros:

Independence from third party resources
Ability to configure DNS for yourself and use your own scripts
For free

Minuses:

Requires 2 IP addresses
Difficulty setting up
Self-service support
Possible problems when using DDoS protection

Registrars require that each domain have at least two name servers: a primary (master) and at least one secondary (slave). The addresses must be two different IP addresses.

To satisfy this requirement, an additional IP address is connected to the server. The primary address is designated as the primary NS, and the secondary address is designated as the secondary NS.

Free DNS hosting

On the Internet you can find many resources offering free DNS servers.

Free DNS hosting is a good solution if you are unable to administer the DNS server yourself. But be careful: free services often include a disclaimer of liability. There may be restrictions on the number of domains and the number of requests per month. Posting commercial projects may be prohibited. Study the terms and conditions of the chosen service well.

Pros:

For free
The ability to find a service that suits the conditions and capabilities

Minuses:

Not responsible for performance
API is missing or difficult to use
Resource Limits

Paid DNS hosting

Paid DNS hosting, unlike free one, guarantees a level of service and provides a set of additional features. This DNS hosting is positioned as fault-tolerant and highly available. It has the transfer of existing settings from other servers and a full-fledged API for which many ready-made recipes have been written.

Pros:

fault tolerance
Full API
Additional functionality

Minuses:

Payable service

Why do you need an API on DNS hosting?

Let's imagine that we rent a paid DNS server. If the site is operating in normal mode, then the data is sent from server A. On server B there is a script running that checks the availability of the site to server A. If it stops working, then the script uses the API to access the DNS hosting and writes the IP-record to the A record. server B address. The site continues to work from the backup server.

Since the switching occurs with minimal delay, visitors will not notice the switch.

CDN proxy

CDN proxies (Content Distribution Network) stand out, which can also be used as DNS. CDN proxies speed up website performance by caching data on a distributed network of servers. The site is served to the client from the server closest to him. CDN can also filter malicious requests (protect the site from DDoS).

CDN networks have a serious drawback: the IP address for domains hosted in the CDN is assigned randomly. Those. it will be impossible to access the site or server directly using the IP address.

In addition, the site may be blocked in the Russian Federation. IP addresses of sites with prohibited content are blacklisted by Roskomnadzor and blocked by providers (and this is not uncommon for CDN networks). If your domain accidentally gets one of these addresses, the site will be unavailable. For this reason, it is necessary to carefully select a CDN provider and learn in advance about IP addresses that are on blacklists and possible problems with them.

Pros:

Increasing the speed of content delivery
Protection against malicious requests
Ease of use
fault tolerance

Minuses:

IP addresses may be blacklisted by Roskomnadzor
Price

If you need to manage DNS records for a domain and it does not provide such an opportunity, you can use third-party name servers, for example, free service“Yandex DNS hosting”, which comes complete with “Yandex Mail for a domain”. This article will cover:

First you need to register an account on Yandex. If you already have an account, please proceed to the next section “Connecting a domain to Yandex”.

After filling out all the required fields and confirming your phone number by entering the SMS verification code, we recommend going into details account by clicking on her name on the right top corner, and by selecting the “Passport” section, indicate personal data: in particular, Security Question and the answer to it. This information will simplify the restoration of access to your account if your password or login is lost.

After this, you can start connecting the domain.

After logging into your account, you need to connect the domain. This can be done using the link: https://pdd.yandex.ru/domains_add/

You can also go to “Mail for a domain” this way: in your account in the line with available services Click “more” and select “All services” from the drop-down menu.

After that, select “Mail for Domain”.

Enter the domain name and click "Connect Domain". After this, you will be automatically redirected to the domain ownership confirmation page.

Domain delegation to Yandex

Delegating a domain to Yandex involves sending the domain to the appropriate public name servers and gaining the ability to manage DNS records in the functionality of this service. If you delegate a domain within 24 hours after connecting it and the connection has not been made previously in another Yandex account, then the domain will be successfully delegated after the process of updating DNS records goes through (it can take up to 72 hours from the moment the name servers are changed in the registrar panel ). Otherwise, you will need to verify domain ownership.

To delegate a domain to Yandex, specify the name servers dns1.yandex.net and dns2.yandex.net in the domain registrar panel. If the domain registrar's functionality includes fields for specifying IP addresses of nameservers, you do not need to fill them out.

After updating the DNS records, the domain status will be changed to “Domain connected and delegated to Yandex”:

Domain ownership confirmation

In order to confirm domain ownership, there are 3 alternative methods presented below:

Method No. 1 - file download

If you already have a hosted website, you will need to upload an html file with the name and content specified on the “My domains” page to its root directory.

Method No. 2 - setting up CNAME

For the specified subdomain, set up a CNAME record for the address mail.yandex.ru (with a dot at the end). To do this you need to have editing access DNS records from your domain name registrar or hosting provider.

If you have an active service with us virtual hosting, you can specify a CNAME record in the cPanel hosting panel in the “Domains” section - “Simple DNS Zone Editor” or “Advanced DNS Zone Editor”.

If you purchased VPS from the site, then you can edit DNS records in the SolusVM panel according to our guide.

The added CNAME record will look like this:

Method number 3 - change e-mail

Specify the e-mail from the “My domains” page as a contact postal address domain registrant. This can usually be done in the domain name registrar functionality. Once domain ownership has been confirmed, you can change your email back to your original one.

After completing the steps according to the selected verification method, click “Verify Domain Ownership.” Please note that the process of updating DNS records takes some time and the domain may not be confirmed immediately. In this case, Yandex will also carry out automatic check at certain intervals. After confirmation of domain ownership, its domain status on the “My Domains” page will change to “Waiting for MX records to be installed” if the domain has not yet been sent to public Yandex servers. In this case, please refer to the “Domain Delegation” section in current management to delegate the domain to Yandex.

If the domain has already been previously sent to Yandex name servers, after updating the DNS records, the domain status will be changed to “Domain connected and delegated to Yandex.”

DNS hosting management from Yandex

After delegating a domain on the “My Domains” page, the following functionality will appear in its details (indicated in the screenshot):

To manage DNS records, you need to go to the “DNS Editor”.

Since the domain has already been delegated to Yandex, the DNS records necessary for Yandex.Mail and Jabber to work on your domain will be automatically added. You can transfer DNS records from previous nameservers to Yandex nameservers. To do this, click “Transfer NS records”, check their correctness and click “Transfer”.

Add missing entries if necessary. If you are adding an entry for your primary domain, leave the “@” icon in the “Host” field. If you are adding an entry for a subdomain, include part of the subdomain name without the main domain name. Select the DNS record type, enter a value, and click Add DNS Record. For example, for the subdomain my.domain.com the A record will look like this:

For correct operation site requires the following DNS records:

Host	Type	Record value
@	A	XXX.XXX.XXX.XXX
*	A	XXX.XXX.XXX.XXX

Instead of XXX.XXX.XXX.XXX, specify the hosting IP address from which the site should open.

An example of DNS records for a domain is shown below:

Looking for where? We offer excellent. If you want virtual hosting, then you can not only order, but also receive a certificate as a gift for virtual hosting on the S4 tariff and for the xVPS40 VDS plan.

15.06.2018

The performance and speed of a website largely depends on correct placement resources, both in the physical world and in the world virtual technologies. Today we are at their work. About how to place on DNS hosting affects the reliability of the site, response speed and resilience of the resource to failure.

Briefly about DNS

To begin with, let's look at basic concepts, without understanding which it is difficult to move on.

DNS is one of fundamental systems Internet. In simple words- list of correspondence between domain names and IP addresses.
Domain name- a unique set of symbols and signs indicating the site address in the form that we are used to seeing every day.
DNS server - the server on which it is installed special program, responding to a user request for a specific key. Those. a program that “translates” the user’s request into the computer language. In addition, data about domain names is stored on DNS servers.