Types of Internet hosting service

Full-featured hosting services Virtual private server Dedicated hosting Colocation centre Web hosting Free hosting Shared hosting Clustered hosting Reseller hosting FFmpeg hosting Application-specific Blog hosting Guild hosting Image hosting Video hosting Wiki farms Application hosting Social network hosting File hosting Remote backup service Game server hosting DNS hosting E-mail hosting An example of "rack mounted" servers.A web hosting service is a type of Internet hosting service that allows individuals and organizations to make their own website accessible via the World Wide Web. Web hosts are companies that provide space on a server they own or lease for use by their clients as well as providing Internet connectivity, typically in a data center. Web hosts can also provide data center space and connectivity to the Internet for servers they do not own to be located in their data center, called colocation.

Contents

1 Service scope

2 Hosting reliability and uptime

3 Types of hosting

4 Obtaining hosting

5 See also 6 External links

Service scope

The scope of hosting services varies widely. The most basic is web page and small-scale file hosting, where files can be uploaded via File Transfer Protocol (FTP) or a Web interface. The files are usually delivered to the Web "as is" or with little processing. Many Internet service providers (ISPs) offer this service free to their subscribers. People can also obtain Web page hosting from other, alternative service providers. Personal web site hosting is typically free, advertisement-sponsored, or inexpensive. Business web site hosting often has a higher expense.
Single page hosting is generally sufficient only for personal web pages. A complex site calls for a more comprehensive package that provides database support and application development platforms (e.g. PHP, Java, Ruby on Rails, ColdFusion, and ASP.NET). These facilities allow the customers to write or install scripts for applications like forums and content management. For e-commerce, SSL is also highly recommended.
The host may also provide an interface or control panel for managing the Web server and installing scripts as well as other services like e-mail. Some hosts specialize in certain software or services (e.g. e-commerce). They are commonly used by larger companies to outsource network infrastructure to a hosting company.

Hosting reliability and uptime

This section does not cite any references or sources.Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (March 2009) Multiple racks of servers.Hosting uptime refers to the percentage of time the host is accessible via the internet. Many providers state that they aim for at least 99.9% uptime (roughly equivalent to 45 minutes of downtime a month, or less), but there may be server restarts and planned (or unplanned) maintenance in any hosting environment, which may or may not be considered part of the official uptime promise.
Many providers tie uptime and accessibility into their own service level agreement (SLA). SLAs sometimes include refunds or reduced costs if performance goals are not met.

File hosting service

hosts files, not web pages Image hosting service Video hosting service Blog hosting service One-click hosting Pastebin Hosts text snippets Shopping cart software E-mail hosting service Obtaining hostingWeb hosting is often provided as part of a general Internet access plan; there are many free and paid providers offering these services.
A customer needs to evaluate the requirements of the application to choose what kind of hosting to use. Such considerations include database server software, scripting software, and operating system. Most hosting providers provide Linux-based web hosting which offers a wide range of different software. A typical configuration for a Linux server is the LAMP platform: Linux, Apache, MySQL, and PHP/Perl/Python. The webhosting client may want to have other services, such as email for their business domain, databases or multi-media services for streaming media. A customer may also choose Windows as the hosting platform. The customer still can choose from PHP, Perl, and Python but may also use ASP .Net or Classic ASP. Web hosting packages often include a Web Content Management System, so the end-user doesn't have to worry about the more technical aspects.

Types of hosting

A typical server "rack," commonly seen in colocation centres.Internet hosting services can run Web servers; see Internet hosting services.
Hosting services limited to the Web:
Many large companies who are not internet service providers also need a computer permanently connected to the web so they can send email, files, etc. to other sites. They may also use the computer as a website host so they can provide details of their goods and services to anyone interested. Additionally these people may decide to place online orders.
Free web hosting service: offered by different companies with limited services, sometimes supported by advertisements, and often limited when compared to paid hosting. Shared web hosting service: one's website is placed on the same server as many other sites, ranging from a few to hundreds or thousands. Typically, all domains may share a common pool of server resources, such as RAM and the CPU. The features available with this type of service can be quite extensive. A shared website may be hosted with a reseller. Reseller web hosting: allows clients to become web hosts themselves. Resellers could function, for individual domains, under any combination of these listed types of hosting, depending on who they are affiliated with as a provider. Resellers' accounts may vary tremendously in size: they may have their own virtual dedicated server to a collocated server. Many resellers provide a nearly identical service to their provider's shared hosting plan and provide the technical support themselves. Virtual Dedicated Server: also known as a Virtual Private Server (VPS), divides server resources into virtual servers, where resources can be allocated in a way that does not directly reflect the underlying hardware. VPS will often be allocated resources based on a one server to many VPSs relationship, however virtualisation may be done for a number of reasons, including the ability to move a VPS container between servers. The users may have root access to their own virtual space. Customers are sometimes responsible for patching and maintaining the server. Dedicated hosting service: the user gets his or her own Web server and gains full control over it (root access for Linux/administrator access for Windows); however, the user typically does not own the server. Another type of Dedicated hosting is Self-Managed or Unmanaged. This is usually the least expensive for Dedicated plans. The user has full administrative access to the box, which means the client is responsible for the security and maintenance of his own dedicated box. Managed hosting service: the user gets his or her own Web server but is not allowed full control over it (root access for Linux/administrator access for Windows); however, they are allowed to manage their data via FTP or other remote management tools. The user is disallowed full control so that the provider can guarantee quality of service by not allowing the user to modify the server or potentially create configuration problems. The user typically does not own the server. The server is leased to the client. Colocation web hosting service: similar to the dedicated web hosting service, but the user owns the colo server; the hosting company provides physical space that the server takes up and takes care of the server. This is the most powerful and expensive type of web hosting service. In most cases, the colocation provider may provide little to no support directly for their client's machine, providing only the electrical, Internet access, and storage facilities for the server. In most cases for colo, the client would have his own administrator visit the data center on site to do any hardware upgrades or changes. Cloud Hosting: is a new type of hosting platform that allows customers powerful, scalable and reliable hosting based on clustered load-balanced servers and utility billing. Removing single-point of failures and allowing customers to pay for only what they use versus what they could use. Clustered hosting: having multiple servers hosting the same content for better resource utilization. Clustered Servers are a perfect solution for high-availability dedicated hosting, or creating a scalable web hosting solution. A cluster may separate web serving from database hosting capability. Grid hosting: this form of distributed hosting is when a server cluster acts like a grid and is composed of multiple nodes. Home server: usually a single machine placed in a private residence can be used to host one or more web sites from a usually consumer-grade broadband connection. These can be purpose-built machines or more commonly old PCs. Some ISPs actively attempt to block home servers by disallowing incoming requests to TCP port 80 of the user's connection and by refusing to provide static IP addresses. A common way to attain a reliable DNS hostname is by creating an account with a dynamic DNS service. A dynamic DNS service will automatically change the IP address that a URL points to when the IP address changes. Some specific types of hosting provided by web host service providers:

Bandwidth and connectivity

Bandwidth refers to the data transfer rate or the amount of data that can be carried from one point to another in a given time period (usually a second) and is often represented in bits (of data) per second (bit/s). For example, visitors to your server, web site, or applications utilize bandwidth as the traffic moves from your server to the Internet and vice versa. Connectivity refers to the “access providers” that supply bandwidth, or data transfer rate, through various connection points across a network or footprint to one or multiple data centers where dedicated servers are housed.
Bandwidth measurements are defined (per telecom standards) as the following:
First – 95th (measured using average bits and speed of transfer) Second – Unmetered (measured in speed or bits) Third – Total Transfer (measured in bytes transferred) 95th Method: line speed, billed on the 95th percentile, average or peak usage, refers to the speed in which data flows from the server or device. Line speed is measured in bits per second (or kilobits per second, megabits per second or gigabits per second).
Unmetered Method: The second bandwidth measurement is unmetered service where providers cap or control the “top line” speed for a server. Top line speed in unmetered bandwidth is the total Mbit/s allocated to the server and configured on the switch level. For example, if you purchase 10 Mbit/s unmetered bandwidth, the top line speed would be 10 Mbit/s. 10 Mbit/s would result in the provider controlling the speed transfers take place while providing the ability for the dedicated server owner to not be charged with bandwidth overages. Unmetered bandwidth services usually incur an additional charge.
Total Transfer Method: Some providers will calculate the Total Transfer, the measurement of actual data leaving and arriving, measured in bytes. Measurement between providers varies, though it is either the total traffic in, the total traffic out, whichever is the greater or the sum of the two.
One of the reasons for choosing to outsource dedicated servers is the availability of high powered networks from multiple providers. As dedicated server providers utilize massive amounts of bandwidth, they are able to secure lower volume based pricing to include a multi-provider blend of bandwidth. To achieve the same type of network without a multi-provider blend of bandwidth, a large investment in core routers, long term contracts, and expensive monthly bills would need to be in place. The expenses needed to develop a network without a multi-provider blend of bandwidth does not make sense economically for hosting providers.
Many dedicated server providers include a service level agreement based on network uptime. Some dedicated server hosting providers offer a 100% uptime guarantee on their network. By securing multiple vendors for connectivity and using redundant hardware, providers are able to guarantee higher uptimes; usually between 99-100% uptime if they are a higher quality provider. One aspect of higher quality providers is they are most likely to be multi-homed across multiple quality uplink providers, which in turn, provides significant redundancy in the event one goes down in addition to potentially improved routes to destinations.
Bandwidth consumption over the last several years has shifted from a per megabit usage model to a per gigabyte usage model. Bandwidth was traditionally measured in line speed access that included the ability to purchase needed megabits at a given monthly cost. As the shared hosting model developed, the trend towards gigabyte or total bytes transferred, replaced the megabit line speed model so dedicated server providers started offering per gigabyte.
Prominent players in the dedicated server market offer large amounts of bandwidth ranging from 500 gigabytes to 3000 gigabytes using the “overselling” model. It is not uncommon for major players to provide dedicated servers with 1Terabyte (TB) of bandwidth or higher. Usage models based on the byte level measurement usually include a given amount of bandwidth with each server and a price per gigabyte after a certain threshold has been reached. Expect to pay additional fees for bandwidth overage usage. For example, if a dedicated server has been given 3000 gigabytes of bandwidth per month and the customer uses 5000 gigabytes of bandwidth within the billing period, the additional 2000 gigabytes of bandwidth will be invoiced as bandwidth overage. Each provider has a different model for billing. As of yet, no industry standards have been set.

Operating system support

Availability, price and employee familiarity often determines which operating systems are offered on dedicated servers. Variations of Linux and Unix (open source operating systems) are often included at no charge to the customer. Commercial operating systems include Microsoft Windows Server, provided through a special program called Microsoft SPLA. Red Hat Enterprise is a commercial version of Linux offered to hosting providers on a monthly fee basis. The monthly fee provides OS updates through the Red Hat Network using an application called yum. Other operating systems are available from the open source community at no charge. These include CentOS, Fedora Core, Debian, and many other Linux distributions or BSD systems FreeBSD, NetBSD, OpenBSD.
Support for any of these operating systems typically depends on the level of management offered with a particular dedicated server plan. Operating system support may include updates to the core system in order to acquire the latest security fixes, patches, and system-wide vulnerability resolutions. Updates to core operating systems include kernel upgrades, service packs, application updates, and security patches that keep server secure and safe. Operating system updates and support relieves the burden of server management from the dedicated server owner.

Dedicated hosting service

"Dedicated server" redirects here. For information about dedicated servers in multiplayer video gaming, see Game server#Types of game servers.
Types of Internet hosting service Full-featured hosting services Virtual private server Dedicated hosting Colocation centre Web hosting Free hosting Shared hosting Clustered hosting Reseller hosting FFmpeg hosting Application-specific Blog hosting Guild hosting Image hosting Video hosting Wiki farms Application hosting Social network hosting File hosting Remote backup service Game server hosting DNS hosting E-mail hosting

Web template

Web templates can be used to set up any type of website. In its simplest sense, a web template operates similarly to a form letter for use in setting up a website.

Content (from a database), and "presentation specifications" (in a web template), are combined (through the template engine) to mass-produce web documents.This article is part of the Web Template Systems series. Web template system Web template Template engine

Contents

1 Template Uses

1.1 Effective separation

1.2 Flexible presentation

1.3 Reusability

1.3.1 Open source templates

2 Notes and references

3 See also

3.1 Examples

4 External links

Template Uses

Web templates can be used by any individual or organization to set up their website. Once a template is purchased or downloaded, the user will replace all generic information included in the web template with their own personal, organizational or product information. Templates can be used to:

Display personal information or daily activities as in a blog. Sell products on-line. Display information about a company or organization. Display family history. Display a gallery of photos. Place music files such as mp3 on line for play through a web browser. Place videos on-line for public viewing. To setup a private login area on-line.

Reusability

Not all potential users of web templates have the willingness and ability to hire developers to design a system for their needs. Additionally, some may wish to use the web but have limited or no technical proficiency. For these reasons, a number of developers and vendors have released web templates specifically for reuse by non-technical people. Although web template reusability is also important for even highly-skilled and technically experienced developers, it is especially critical to those who rely on simplicity and "ready-made" web solutions.
Such "ready-made" web templates are sometimes free, and easily made by an individual domestically. However, specialized web templates are sometimes sold online. Although there are numerous commercial sites that offer web templates for a licensing fee, there are also free and "open-source" sources as well.

Open source templates

The rise of the open source design movement has seen a slow but steady rise in the community of open source designers. Some sites offer open source templates in addition to other content.

Flexible presentation

One major rationale behind "effective separation" is the need for maximum flexibility in the code and resources dedicated to the presentation logic. Client demands, changing customer preferences and desire to present a "fresh face" for pre-existing content often result in the need to dramatically modify the public appearance of web content while disrupting the underlying infrastructure as little as possible.
The distinction between "presentation" (front end) and "business logic" (infrastructure) is usually an important one, because:
the presentation source code language may differ from other code assets; the production process for the application may require the work to be done at separate times and locations; different workers have different skill sets, and presentation skills do not always coincide with skills for coding business logic; code assets are easier to maintain and more readable when disparate components are kept separate and loosely coupled;

Effective separation

A common goal among experienced web developers is to develop and deploy applications that are flexible and easily maintainable. An important consideration in reaching this goal is the separation of business logic from presentation logic. Developers use web template systems (with varying degrees of success) to maintain this separation.

One difficulty in evaluating this separation is the lack of well-defined formalisms to measure when and how well it is actually met. There are, however, fairly standard heuristics that have been borrowed from the domain of software engineering. These include 'inheritance' (based on principles of object-oriented programming); and the 'Templating and Generative programming', (consistent with the principles of MVC separation). The precise difference between the various guidelines is subject to some debate, and some aspects of the different guidelines share a degree of similarity.

Overselling

Overselling refers to selling of a volatile good in excess of actual capacity.

Contents
1 Internet connectivity
2 Web Hosting
3 References
4 External links

edicated server hosting providers may provide the following types of server managed support:

Fully Managed - Includes monitoring, software updates, reboots, security patches and operating system upgrades. Customers are completely hands-off. Managed - Includes medium level of management, monitoring, updates, and a limited amount of support. Customers may perform specific tasks. Self Managed - Includes regular monitoring and some maintenance. Customers provide most operations and tasks on dedicated server. Unmanaged - Little to no involvement from service provider. Customers provide all maintenance, upgrades, patches, and security. Note: The provider will continue to maintain security on the network regardless of support level.

Programming consultation

Dedicated hosting server providers define their level of management based on the services they provide. In comparison, fully managed could equal self managed from provider to provider.
Administrative maintenance of the operating system, often including upgrades, security patches, and sometimes even daemon updates are included. Differing levels of management may include adding users, domains, daemon configuration, or even custom programming.

Management

Server management can include some or all of the following:

Operating system updates Application updates Server monitoring SNMP hardware monitoring Application monitoring Application management Technical support Firewall services Antivirus updates Security audits DDoS protection and mitigation Intrusion detection Backups and restoration Disaster recovery DNS hosting service Load balancing Database administration Performance tuning Software installation and configuration User management Programming consultation

Web Hosting

In the web hosting industry, the term is used to describe a situation in which a company provides hosting plans that are unsustainable if every one of its customers uses the full extent of services advertised. The term is usually referred to the web space and bandwidth transfer allowance. A hosting company may offer unlimited space and unlimited bandwidth, however, they put other restrictions in place such as CPU usage or inode limit. They may have onerous restrictions and one-sided contracts that lets them cancel the hosting of anybody that puts a strain on their system or fully uses their claimed allotments.
This practice usually incurs little ill-effect since most customers do not use any significant portion of their allocated share. If a customer has a small, low-traffic site serving static HTML pages, few resources will be used. If a customer wishes to run a high-traffic, professional, or business website an oversold hosting account can be detrimental. In these cases, a shared hosting provider that does not oversell, a virtual private server or dedicated server is a preferred option.

Internet connectivity

ISPs regularly sell more bandwidth or connectivity than they have. One of the most successful dial-up providers America Online had an extremely high subscriber-to-line ratio of 20:1. While initially relying almost solely on overselling, broadband providers have recently been pushing hard to get out of that business model. They wish to prevent commoditization as users become more elastic to available bandwidth.

Limitations

Many providers do not allow IRC (bots, clients or daemons). This is due to rogue IRC users triggering DDoS attacks against the provider, which may overwhelm their networks, lowering service quality for all customers.
Adult content is disallowed by many providers as it may either be of questionable legality or consume large amounts of bandwidth. Copyright violation Hosting copyrighted material of which you do not own the copyright to is against the terms of service of most hosting companies.

Software

Microsoft offers software licenses through a program called the Service Provider License Agreement. The SPLA model provides use of Microsoft products through a monthly user or processor based fee. SPLA software includes the Windows Operating System, Microsoft SQL Server, Microsoft Exchange Server, Microsoft SharePoint and shoutcast hosting, and many other server based products.
Dedicated Server Providers usually offer the ability to select the software you want installed on a dedicated server. Depending on the overall usage of the server, this will include your choice of operating system, database, and specific applications. Servers can be customized and tailored specific to the customer’s needs and requirements.
Other software applications available are specialized web hosting specific programs called control panels. Control panel software is an all inclusive set of software applications, server applications, and automation tools that can be installed on a dedicated server. Control panels include integration into web servers, database applications, programming languages, application deployment, server administration tasks, and include the ability to automate tasks via a web based front end.
Most dedicated servers are packaged with a control panel. Control panels are often confused with management tools, but these control panels are actually web based automation tools created to help automate the process of web site creation and server management. Control panels should not be confused with a full server management solution by a dedicated hosting provider.

Security

Dedicated hosting server providers utilize extreme security measures to ensure the safety of data stored on their network of servers. Providers will often deploy various software programs for scanning systems and networks for obtrusive invaders, spammers, hackers, and other harmful problems such as Trojans, worms, eggdrops and crashers (Sending multiple connections). Linux and Windows use different software for security protection.