Shared Hosting

Shared hosting is an INTERNET hosting concept primarily for websites, in an environment
Technical whose main characteristic is to be shared by several users. This architecture is adapted to
the importance and low or average audience sites that do occasionally seeking the resources of the server
IT for accommodation (CPU, RAM, disk space, bandwidth). The administration of the
servers is provided by a third-party intervener (and not by the owner of the accommodation).




A private server or virtual server is a shared hosting form but stands to logic, because if the
Virtual Server is only a sub-part of a physical computer server, a logical and functional point of view it
behaves almost identically to a dedicated server, except for some specifics on the kernel .  pooling and dedicated server
is not exclusive for informatique1 decision maker.

• Architectural Principles

This is mostly for high power computer servers, including in terms of memory and disk space,
whose resources are assigned fixed or dynamically to a set of users. Generally, these can
connect via proprietary administrative tools, open-source or commercial, for direct access could
compromising the integrity of the server or make it unavailable resources.

Each user is assigned an account on a given machine. It is possible, in some architecture,
that resources are shared across multiple physical machines.

The main resources of the server are characterizing a shared hosting, as appropriate:

    Maximum RAM allocated;
    processor power, in percentage or in units;
    disk space;
    authorized web traffic ;
    maximum bandwidth;
    Shared IP address;
    operating system (Linux most often, but also Windows).

• Benefits

    The cost is directly proportional to the allocated resources, the latter is generally less than that of an accommodation
dedicated; some even offer free hosting solutions. However, when it comes to private servers or
virtual, the cost depends on additional parameters such as:
The guaranteed level of resources allocated to each client on the shared infrastructure,
 The type of tools and logical layers implemented to fragmentation of infrastructure systems for sealed
each other.
The reliability of the solution have totally administered resources and the legal responsibility of
provider.
The technical availability (through server administration by the host).

• Disadvantages

  By definition of the solution, the resources are limited
 The installation of certain components or software is not possible because the user does not have                  administrative rights.
    Using SSL is difficult because it requires a dedicated IP address to a domain name.
    The same IP address is shared by hundreds or thousands of websites. It is sufficient that one of these websites transgresses
the rules so that this IP address is put in "black list" - all other sites hosted on the same address
suffering the consequences. The "black lists" are established by independent organizations like spamhaus.org and
used by many anti-Spam software. Such software can be based on the IP addresses of websites.
An IP address remains blacklisted as the host does not intervene, which sometimes takes several months for
unwilling or overworked customer service requests.