DNS
DNS DNS - domain name system, a system for locating a web site.

DNS - domain name system. This system helps to find a real server by virtual site name. The system is realized by the hierarchy of DNS servers, each of them holds information about specific domains and may delegate such role to lower stage servers. Let's take, for example, site www.host-tracker.com. The upper domain is .com, so the request is made to the server, which is responsible for all .com sites. It knows where each site is located, or at least, where is another server, which knows for sure. If you get "Server not found" message, that means no record exists on the DNS server for the site name you've requested.

Each time you enter an address into the browser - a DNS request is made, in order to find where the site is located. To make this process faster, DNS data can be saved into a cache. If you own a site and decide to change its name for some reason, or if you have just created the new one - you should keep in mind that DNS cache needs some time to be updated globally. Usually, it happens within couple of hours, but it can take up to 48 hours. That's why sometimes a newly-hosted site can not be visible for some time.

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Some secrets of content monitoring

HostTracker provides the best practice for monitoring both content changes and website availability. HostTracker’s tools allow you to check whether your webpage loads correctly and test it for errors as frequently as you’d like. Additionally, you'll know:

▶ Why do we need that?

▶ Service Settings;

▶ Content Check Methods.

HostTracker provides the best practice for monitoring both content changes and website availability. HostTracker’s tools allow you to check whether your webpage loads correctly and test it for errors as frequently as you’d like. Moreover, our service will be the best assistance in tracking websites with complex structure.

Why do we need that?

With “Content Check” you can spot the presence/absence of specific words on your page, as well as, to monitor the integrity of the website. However, it shows that it is insufficient to enable clear conclusions about the webpage performance. And there will certainly come a point in the life when questions like these arise: “Does the data load completely from the database?” “Are there any missing items on my page?” “What if my website is being hacked right now?” etc.

Little time for writing a simple script on your site - and you can check whatever you want. Server scripts come in handy when there is a need to keep an eye on any changes in website performance. To illustrate, you can write a script which will display “OK” provided everything is operating fine or there is enough disk space. If it happens that the website seems to be available, but actually “Error connect to mysql” pops up, then it’s highly recommended to tune the monitoring function for tracking the absence of a word, in particular, the word “Error”. To the boot of all that, this function can be used as a stopgap to identify obscene comments or suspicious activity until more sophisticated alternatives can be found. Notably, unwanted activity can be tracked by detecting the keywords of virus scripts.

The “Content Check” tool is easy to use and the results are crystal-clear for understanding. Moreover, our service is cloud-based, so you don’t need to install any additional software. Interestingly, the same check let hit HTTP load-testing and collects all statistics you need. Simultaneously, you can carry on website speed and response time tests and, by extension, pinpoint whether your IPs is blacklisted with one of nearly seventy DNS based blacklists.

Service Settings

Are you ready to start monitoring your website content? Let’s go! First and foremost, type the URL of your website into the space provided (or click on “Add list” - if you need to monitor a bulk of websites). Please, pay attention to the “Content Check” field – complete blank space with keywords you wish to monitor, use commas to separate words. It’s worth noting that HostTracker will keep you always updated on your webpage performance, and if, for instance, the presence/absence status of the certain phrases ever changes, you’ll be notified immediately by email and/ or by phone.

Additionally, there are some additional content monitoring options. The first advantage of using them is that, they give you the opportunity to choose only words or phrases that you want/don’t want to show on your website. The second advantage is that, in case of defining a series of keywords, both the disappearance of all words and a single one cause the error. A tick next to “Follow redirect” reflects that the request is forwarded to the target page (defined in the Redirection).

Methods

For more configuration options, click on “Advanced options” drop-down list. Make sure your desired method is set up in the “HTTP method” area.

Available HTTP methods:

  • GET (default parameter value) - is used to retrieve information from the Request-URI for keywords search.

  • POST – gets a content body used to send specific parameters and data.  It tests the functionality and correctness of the website forms.

To sum up, HostTracker incorporates a lot of powerful tools - you're bound to find something you'll like!

 

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Home > FAQ
Ключевые советы для поддержания работы сайта (Русский)
  • Оптимизируйте контент сайта. Максимально возможное сжатие изображений, до последнего килобайта, позволяющее сохранить качество изображения.
  • Используйте Minify (приложение PHP5) для CSS и JavaScript для сжатия веб-данных, и размещайте JavaScript в конце документа, если это возможно.
  • Добавьте заголовки «expires» для контента, чтобы избежать постоянной загрузки браузерами одних и тех же файлов при просмотре вашего веб-сайта пользователем.
  • Убедитесь, что ваш веб-сервер обеспечивает предоставление контента в сжатом состоянии - например, mod_deflate для Apache. Очевидно, что это правило не касается таких файлов, как изображения, которые уже сжаты, поэтому убедитесь, что вы задали все настройки правильно.
  • Уменьшите количество HTTP-запросов для попадания на ваш Веб-сайт. Совместите CSS в одном файле. Совместите JavaScripts в одном файле, где это возможно. Включайте эти файлы только в страницы, где они действительно необходимы.
  • Оптимизируйте систему управления контентом. Например, уменьшите количество обращений к базе данных, необходимое для каждого запроса страницы. В Drupal этого можно достичь всего лишь отключив ненужные модули. Кроме того, увеличьте эффективность всех пользовательских кодов, где это только возможно. Изменение на одной десятую долю секунды в алгоритме, который используется тысячи раз, будет заметным.
  • Поддерживайте кэширование часто используемых данных. Используйте Memcache или нечто подобное. Многие пакеты CMS поддерживают эту возможность, но будьте осторожны с динамическими характеристиками.
  • Уравняйте нагрузки веб-сервера.
  • Разделите базы данных для чтения/записи, так что обеспечит иерархическую структуру баз данных, делая их благодаря этому размерно варьируемыми.
  • При возможности, разделите базу данных вертикально или горизонтально (или совместите эти направления, если эта модель подходит для структуры вашей базы данных) для нескольких серверов. Хотя это может подходить не для всех случаев.
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