Active Monitoring
Active Monitoring Active Monitoring is the way to check the site performance by simulation of visiting by real users.

Active Monitoring is the way to check the site performance by simulation of visiting by real users. It is done by external service, usually with distribyted networks. The checking servers create the requests like the real clients, who are trying to download a web page. Doing it on regular schedule, allows to check if the page is available from the web. If not - there is a possibility to catch and report the error. The difference between the bot and a real person is visible only for bulky pages with lots of content - in order to save the traffic, monitoring systems usually download only a part of such pages, which is enough to make sure the site is Ok.

Active monitoring is an independent eye on your site. The checking is not connected to your company and web hosting, and so provides the clear third-party view of the situation. HostTracker service uses active monitoring to supervise web sites.

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"

I was informed when my site was down in a timely manner. Saved me lots of downtime and loosing traffic.

"
- Fey.
Twelve Ways to Improve Uptime Website

It is rather strange, but instead of going down web services usually grow so overloaded with the user requests that after slowing down they become unresponsive. But nowadays it is extremely important to provide secure and high-quality web hosting services, available anytime, as e-businesses is acquiring popularity. The owners of the websites demand perfect service, 100% uptime and quality assurance...

It is rather strange, but instead of going down web services usually grow so overloaded with the user requests that after slowing down they become unresponsive. But nowadays it is extremely important to provide secure and high-quality web hosting services, available anytime, as e-businesses is acquiring popularity. The owners of the websites demand perfect service, 100% uptime and quality assurance. Numerous techniques may be used to make access to the website smooth, thus increasing uptime. Site uptime informer

Here we offer you twelve methods recommended to achieve performance gain and uptime increase. Software optimization is required for that, as well as hardware optimization. A lot of software features may be upgraded with the use of general and improved coding standards, operated by the website manager. At the same time the company providing the webhosting services needs to improve the hardware constantly.
You can measure the accessibility of the website using monitoring services HostTracker.

Software Optimization
The following are the first six ways to improve uptime:

  • Split the databases
  • Separate the read an write databases
  • Use popular content caching more often and improve its quality
  • Optimize static content
  • Ensure compressed delivery of content
  • Optimize the content management system


To begin with, splitting  the databases – horizontally or vertically, or combining these two directions - is essential, making the connection more reliable. It is also good to differentiate the read and write databases, this giving an opportunity for master/slave setup. These actions are useful to extend the database infrastructure for future use.

Second, when you set the system to use better popular content cache, and to use it more often, your site will scale up more easily with many users operating it. Internet caching has no difference from computer caching: it supposes storing popular content at a separate container, allowing much quicker access to the information for the users.

To optimize static content is one more way to make the access to internet pages and files quicker. One of the means for it is to compress the images to the maximum extent possible (but, of course, preserving their high quality). Moreover, it is necessary to check if the web server may be used to deliver compressed content; this characteristic is not connected with the images, as they are already compressed files. Take care to have all the appropriate settings from the beginning.
.
One more appropriate thing to do is to improve the system of content management reducing the database calls number for each page request. It is like any type of connection: at the decrease of the information sending times the connection is maintained. In this circumstances, the number of calls to the database should be as low as possible – it will ensure that the users are able to access the content with the greatest speed.

Software and Hardware Optimization
The next six methods for augmenting uptime are:
Six more ways to augment the uptime are the following:

  • Use content delivery networks
  • Use emerging standards, such as HTML5
  • Improve the programming techniques
  • Add the content “expires” headers
  • Lessen the number of HTTP requests
  • Use Ethernet connections, allowing for more speed


Contend delivery networks allow for operation over larger amounts of media, at the same time improving the performance of the site. They are developed to direct the traffic to private networks. Such services allow operation over large media files, rooting the traffic along the Internet age, not straightly, averting extreme overloading. As the content delivery networks operate with large files, this unloads the servers, providing quick and qualitative connection.

Emerging standards, such as HTML5, include systems, improving the websites. It is achieved through advanced programming techniques, aimed at website and internet communications. Such standards do not 100 % assure that the website that uses them will not go down, but the in-built mechanisms of the code will act as the auxiliary mechanisms if it happens. Moreover, you should use improved programming methods while working with large loads and traffic spike.

“Expiers” content headers make all the automatically downloaded files cacheable for the visitors. So adding these headers to the content you will prevent the constant downloading of the browser. It blocks page review pointless HTTP requests. As well as the reduction of the database calls number, the reduction of the HTTP requests number will make the connection speed stable and not overloaded.
The last method is to develop Ethernet connection speeds. This will allow to cope with larger files and unexpected traffic spikes. A lot of hosting providers consider it as an excellent investment.

Speeds improvement and downtime reduction make the customers happier. Many of these methods to improve the web server or web site uptime may be achieved in a few minor steps. Such tactics, including Database rearrangement software optimization, caching improvements, content compressing, use of content delivery networks and content management systems, programming practices improvements and hardware upgrading will improve the web host as well as web site uptime, thus also improving your business.

 

 

 

 

 

 

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Home > Glossary
Active Monitoring
Active Monitoring Active Monitoring is the way to check the site performance by simulation of visiting by real users.

Active Monitoring is the way to check the site performance by simulation of visiting by real users. It is done by external service, usually with distribyted networks. The checking servers create the requests like the real clients, who are trying to download a web page. Doing it on regular schedule, allows to check if the page is available from the web. If not - there is a possibility to catch and report the error. The difference between the bot and a real person is visible only for bulky pages with lots of content - in order to save the traffic, monitoring systems usually download only a part of such pages, which is enough to make sure the site is Ok.

Active monitoring is an independent eye on your site. The checking is not connected to your company and web hosting, and so provides the clear third-party view of the situation. HostTracker service uses active monitoring to supervise web sites.

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Availability
Availability Availability of a site shows if a site is accessible from the Internet.

Availability of a site shows if a site is accessible from the Internet. This term is also about access to a server, database or another entity. As all objects in the Internet are based on comlicated infrastructure, nothing can be available always. The question is how to measure it, what is normal and if we may affect it anyway. The measurement of availability is connected to terms Uptime and Downtime, which show for how long a site is unavailable. However, these values can not create the full view of the situation. There could be many reasons of unavailability - server or connection problems, application error, overload of the site and so on. To avoid or shorter the failures, it is needed to supervise the site and analyze the errors, if they happen. For these purposes there are special monitoring tools, which help to increase to availability of the site, collect statistics and provide necessary information about the errors for fast repair. These tools are called Website Monitoring services.

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Content Check
Content CheckContent check is a way to check the presence of specific info on the page.
Content Check Content check is a way to check the presence of specific info on the page.

Content check is a way to check the presence/absence of specific info on the page. It helps to check not just the page itself for accessibility, but the performance of the site too. It is useful for sites with complicated structure - which contain many scripts and data that is stored in database or other off-site storages. In this case, there is possible cases when the page itself is working fine while some of the linked resources are not available - thus, some info on the page is missed.

HostTracker provides tools to solve this problem. You may create ContentCheck task and provide specific keywords for monitoring:

There are several important things on that screen:

Content Check - set of comma-separated keywords to look for.
Advanced Content Check option - useful for immediate detection of the reasons of a problem. In case of appearance of the keyword, the phrase, previous to the keyword, is sent you as the result of the check. For example, you enter keyword exception and select this option. Somehow, on the page appears the statement: Wrong SQL statement on the line 123 exception. In this case, you get an alert saying Wrong SQL statement on the line 123.
Conditions Field - allows to specify conditions for set of keywords. You may set to detect an error in case of presence/absence of all entered keywords, or just any of them.

For monitoring the presence of images, videos, execution scripts - you may choose a keyword from their description, or add a special short script which will return Error or other keyword if something is missed.

Restrictions:
Only first 10 Kb of page are analysed
Only first 120 characters of each line are analysed

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Database Monitoring
Database monitoring Database monitoring - DB check for access and regular execution of the specified query.

Database monitoring feature allows to run a query during every check and react in the appropriate way on the result. Also, it is possible to check just possibility to connect to DB - by ignoring the query field. To set the monitoring, fill the connection data: DB server address, port, database name, login and password of a user for connection. We strongly recommend to create the new user with limited rights. However, do not forget to provide him enough rights for performing the supposed actions. Also, it is necessary to add HostTracker servers addresses, to the whitelists on firewall or other blocking software, to allow the access. The addresses are permanent, and are listed on the same form.

Create ContentCheck Task

There could be arbitrary query - SELECT, UPDATE, DELETE, INSERT, execution of stored procedures (like scheduler), results comparison, logical operations. The only restriction is execution time - it should not take longer than 30 seconds. Otherwise, the timeout error will be reported.

It is recommended to create the queries which display the necessary value in the first row of the first column. This result can be analysed. For UPDATE, INSERT, DELETE queries the number of affected rows is analysed. There are different ways to analyse the resulted value by comparison with specific preset - equal/not equal/higher/lower/in range. In case the condition is not satisfied, no connection to DB, query timeout - the error is reported.

Create ContentCheck Task
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Distributed Monitoring
Distributed Monitoring Distributed monitoring is a method of website monitoring when the checking is performed from several locations.

Distributed monitoring is a method of website monitoring when the checking is performed from several locations. The main purpose for this is to exclude errors of checking server (which is always possible) from the site statistic and provide more precise result. Usually it is realized through the network of independent servers which check the sites one-by-one or simultaneously. The advangtages of such checks are listed below:

Checks are happening from different locations, just like the real users do.

If a single check fails - others may prove or decline the failure. So, probability of false downtimes is really low.

It is possible to overview the access and download speed from different countries and cities.

Possibility to catch network-related or DNS problems: site might be visible from your computer, but are you sure it works for everyone?

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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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Downtime
Downtime Downtime is when your site does not work. It's really bad.

Downtime is when your site does not work. If the site does not work - you'll not get any benefits from its existence. Downtime is opposite to uptime. There could be various reasons why a site does not work. Most usual cases: problems with server, server overload, application error, network problems and so on. The first step of fixing en error is detecting. There are special instruments, called website monitoring services, which may check sites for errors over the time. Such tools help you to detect error and provide primary analysis of its reasons. Also, usually some information could be found in server logs. If you have access to them, you should review. If not - ask your hosting company to provide them. Detecting of errors may help you to evaluate the reliability of your site and hosting.

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HTTP
HTTP HTTP - hyper text transfer protocol, a way to transfer website data via Internet.

HTTP - hyper text transfer protocol, a way to transfer website data via Internet. At first, was created for transfer of HTML documents, now most of website data (audio, video, images etc.) is downloaded through this protocol. HTTP has several methods - to check a website, to get the data from the server, and to upload some information from client to the site. More about them you may find in this article. HTTP has its secure version - HTTPS

This protocol is used by clients to review web pages. Thus, to check a website, we should use it too. Website monitoring services, like HostTracker, perform HTTP checks to make sure that the site is operating well.

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HTTP methods
HTTP methods HTTP methods define actions, wished to perform to a specific site.

GET method is used when the page is loaded from server to your browser. If it works, your web page is available to load. It is the most common method among all, when you type a site address in your broswer - this method is used to show you the site content.

HEAD method is similar with GET, but it load from server only headers of your page. It is useful if You want to test just accessibility of a web page or review its headers.

POST method is used to send information from you to server. If a page includes text field(s) for filling, POST method is used when you click button "submit" (or whatever is name of that button). It brings information you have typed into those fields to server. So, if there are some text fields on your page, you can use this method. If it works, your web page is available to use, and text, typed into fields on your page, is able to be transferred to the server. An example of using POST method for Website Monitoring is provided in this article (You provide specific keywords, which are inserted into text fields).

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Passive Monitoring
Passive Monitoring Passive Monitoring is the way to check the site performance by server-side software.

Passive Monitoring is the way to check the site performance by server-side software. It can create the exact copy of incoming traffic for analysis, or it can operate on real traffic. Passive monitoring may collect statistics and watch over some important values, like traffic consumption, number of visitors etc. Also it is handy to analyze the real workflow on your site. However, only server-side errors could be caught. If case of broken Іnternet connection or other Internet-related errors, passive monitoring fails - as it shows only the server performance which is Ok. You'll notice the the lack of visitors, but this fact does not appear immediately. And this is the main difference between the Passive Monitoring (server-side) and Active Monitoring (third-party).

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Ping (ICMP)
Ping (ICMP) Ping is request message for protocol ICMP.

Ping is request message for ICMP (stands for Internet Control Message Protocol). This protocol is used by different network devices to check if a service or a device is available. Usually it is used for network diagnostics.

Ping monitoring allows you to keep an eye on your network infrastructure. Ping failure means broken connection to a network entity. It is handy to use Ping together with HTTP monitoring. In this case, you get additional information - for example, you know if the error is site-related, or the whole server has gone down. However, sometimes ICMP could be blocked for incoming requests, in order to prevent ddos attacks.

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POST method example
POST method example Example of monitoring a webform with POST method.

For example you have such simple form:
form action="some-site.com/some-script.cgi" method=post
input type=text name=login value=''
input type=password name=password value=''
input type=submit name='Submit' value='Login'
/form
User fill this form with value login: Peter and password: 1234 and click submit. If everything is Ok, script prints "LoginOk" on the result page.
For making a monitoring task to control this script, create task with next fields:

URL: some-site.com/some-script.cgi
Http Method: choose POST
In "POST parameters" field you should add three strings:
login=Peter
password=1234
Submit=Login
In "Content check" field: LoginOk
Results: HostTracker with every check will fill this form and assume that it is OK if the set keyword LoginOk is returned.

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Quick Start Guide
Quick Start GuideStart using HostTracker in 5 minutes

1. SignUp and fill the Profile

2. Enter your sites for checking
Create monitoring task

3. Set monitoring parameters
Set monitoring parameters

4. Register contacts for alerts and reports
Create contact for alerts and reports

5. Subscribe for alerts
Subscribe for alerts

6. Subscribe for reports
Subscribe for reports

7. When the Free Trial expires, subscribe to a permanent package
Upgrade your account

In case of any questions, write us to ht2support@host-tracker.com

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Response Time Monitoring
Response time monitoring Response time monitoring is testing how fast is your site.

Response time monitoring is testing how fast is your site. It might be accessible, but bad performance can still make it unattractive for the clients. The monitoring of the response time allows you to check how the site acts as the time goes on. Do any of the scheduled tasks, like backup, updates etc affect the performance? Does the site works well for the whole world, or some regions of interest could meet a confusing delay?

HostTracker provides a possibility to check the reaction of your site. Select Response time check on the main screen:

Create ContentCheck Task

Then, select the largest satisfactory response time for the site. Is this value is exceeded, you receive a notification. Also, all the statistics is stored in the check log, and response graph is generated. You may check this data at anytime.

Create ContentCheck Task

NOTE! Response time depends on the distance between the datacenter of your site and our checking server. It might be large enough for a remote country. To decrease this effect, select a checking region in advanced options.

Create ContentCheck Task
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Uptime
Uptime Uptime is the period of time when a site performs well.

Uptime corresponds to the time when a site is accessible from the Internet. The opposite term - downtime - shows for how long a site has not been working during specified period of time. Usually uptime is measured in percents, and for period of time is choosen year. Percents over the year could be easily transformed into time values. Some typical values of uptime and corresponding period of unavailability during the year are shown here:

90% - 876 hours

99% - 87 hours, 36 minutes

99.9% - 8 hours, 45 minutes, 36 seconds

99.99% - 52 minutes, 34 seconds

So high uptime is really important. Even if it seems that 99% is pretty high value - it corresponds to several days of failure. If that happens in a row, many clients can be lost. Uptime value is usually guaranteed by web hosting, where the site is hosted. Website Monitoring may help you to increase the uptime and check if the value, declared by the hosting company, is real.

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Web Hosting
Web Hosting Web Hosting is a service which makes a site available from the Internet.

Web Hosting is a service which makes a site available from the Internet. It provides a physical place for your site (server) and Internet connection, also it may provide DNS services. Hosting companies differs from those who own huge datacenters to the small ones who rent couple of servers somewhere.

How to choose a hosting? You should pay attention to several important things: features, price, support and uptime.

Features include disk space, database usage, bandwidth, monthly traffic etc. Requirements totally depend on your site. It is clear that personal page has different requirements than a well-known online market.

Price. You may even find completely free hosting, just look if the service satisfies your needs.

Support. How long does it take to solve a problem with your site? What is an avarage response time? Your site is down for a week, and noone cares - is that possible?

Uptime - what is actual running time of the site.

Reliable hosting is very important for business. Using website monitoring services may help to evaluate the hosting service and check how often do the problems really appear.

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Website
Website Website is a basic unit of information in the Internet.

Website is a single resource of information in the Internet. Usually, it is realized through a set of web pages, devoted to some specific topic. The pages are written in special markup lenguages and may contain various types of data - applications, audio and video files, images etc. The site is hosted on a hardware server and can be found in the Internet by unique name due to DNS. The access to a website usually provided by HTTP (hyper text transfer protocol), or its secure version - HTTPS. This protocol provides possibility to deliver information from the server to a client, who is usually viewing the pages with the help of special application, called browser.

  • CM.Glossary.Uptime
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Website monitoring
Website monitoring Website monitoring is an automated process of checking availability of a site.

Website monitoring is an automated process of checking availability of a site. The main goal of it is evaluation of possibility to access the site by clients. It is clear, that a site is efficient when an interested person can load the page and make a purchase or look for some information. If this action fails for some reason - the site does not execute its mission, and a client will find what he needs somewhere else.

There are many solutions of this problems, and all of them could be divided into passive and active ways. The result of monitoring is the value of uptime, measured with some accuracy. Having it, one can conclude how long is the site broken during some period of time (usually, for a year). Low uptime usually means that the server where the site is hosted, or internet connection to it, is unreliable and is required to be changed.

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