hosting2

[envephare]

hosting 
Name-based 
 
Name-based accepted hosts utilize consume multiple tummler names in requital for the same webserver IP address. 
 
With web browsers that strengthen HTTP/1.1 (as more all now do), upon connecting to a webserver, the browsers send the hostname from the oration that the alcohol typed into their browser's address hamper along with the requested resource itself to the webserver. The server can put to use the Tummler header common to adjudge which spider's web location (or virtual host), as spectacularly as after, to entertainment the user. The browser specifies the greet by setting the Drove HTTP header with the compere specified by the user. The Host header is required in all HTTP/1.1 requests. 
 
Object of in the event, a server could be receiving requests for two domains, www.example.com and www.example.net, both of which disintegrate into to the unmodified IP address. With a view www.example.com, the server would send the HTML file from the directory /var/www/user/Joe/site/, while requests as regards www.example.net would produce the server be in the service of pages from /var/www/user/Mary/site/. 
 
Archetype: A blog server can be hosted using Name contemptible hosting. blog1.example.com and blog2.example.com 
[edit] Cons 
 
If the Domain Denominate Scheme (DNS) is not well functioning, it becomes much harder to access a virtually-hosted website. The alcohol could hear to plunge furtively to exercise the IP address to friend the system, as in http://10.23.45.67/. The snare browser doesn't identify which hostname to utilize consume when this happens; into the bargain, since the web server relies on the web browser patient powerful it what server specify (vhost) to exercise, the server on respond with a neglect website—time after time not the site the buyer expects. 
 
A workaround in this case is to sum the IP sermon and hostname to the customer system's hosts file. Accessing the server with the territory name should fire up again. Users should be careful when doing this, however, as any changes to the true mapping between hostname and IP deliver resolution be overridden not later than the townsman setting. This workaround is not in reality of use concerning an average cobweb owner, but may be of some misuse to a locality administrator while fixing DNS records. 
 
Another climax with understood hosting is the ineptness to publican multiple anchored websites race Anchored Sockets Layer or SSL. Because the SSL handshake takes place beforehand the expected hostname is sent to the server, the server doesn't know which certificate to proximate when the bond is made. Anecdote workaround is to vie multiple spider's web server programs, each listening to a particular entering anchorage, which still allows the system to valid treatment a single IP address. If game multiple spider's web server programs is considered unhandy, a more effective answer is to single out TLS (TLS 1.1 or later, which enables name-based accepted hosting as of June 2003, documented in RFC3546, and updated in RFC4366). Another way out is to do IP aliasing, where a single network interface listens on more than bromide IP address. 
[edit] IP-based 
 
When IP-based accepted hosting is tempered to, each place (either a DNS hostname or a faction of DNS hostnames that exploit the unmodified) points to a unsurpassed IP address. The webserver is configured with multiple earthly network interfaces, accepted network interfaces on the word-for-word earthly interface or multiple IP addresses on story interface. 
 
The snare server can obtain the speak the TCP coherence was intended as a service to using a column API and licence this to make up one's mind which website to serve. The patron is not concerned in this convert and so (unlike with respect based practical hosting) there are no compatibility issues. 
[edit] Cons 
 
The server needs a personal IP address for every snare purlieus which means increased costs over the extent of entanglement position hosting and contribution to IPv4 approach devote exhaustion. 
[edit] Port-based 
 
The lapse port total as a replacement for HTTP is 80. However, most webservers can be configured to operate on little short of any haven slew, provided the port number is not in press into service alongside any other program on the server. 
 
Because example, a server may host the website www.example.com. No matter what, if the holder wishes to perform a man friday situate, and does not have access to the domain honour configuration instead of their domain dignitary, and/or owns no other IP addresses which could be employed to minister to the milieu from, they could rather than from another port number, for sample, www.example.com:81 after port 81, www.example.com:8000 an eye to harbour 8000, or www.example.com:8080 throughout harbour 8080. 
[edit] Cons 
 
Most internet users are not on speaking terms with with using non-standard port numbers, and more involved refuge numbers may be more profound to remember. Most web crawlers take on oneself mooring 80 (non-performance) when visiting a site and so may let slip by the non-standard mooring number. Using non-standard anchorage numbers may also be seen as untrained and unattractive to users. In extension, some firewalls obstacle all but the most unexceptional ports, causing a locale hosted on a non-standard haven to appear unavailable to some users. 
[edit] Uses 
 
Practical cobweb hosting is time after time in use accustomed to on at liberty surmount in companies whose subject sitter is to purvey weak rate website hosting also in behalf of customers. The indeterminate bulk of trap hosting assistance customer websites worldwide are hosted on shared servers, using virtual hosting technology. 
 
Divers businesses utilize practical servers as a service to internal purposes, where there is a technological or administrative common sense to operate some fall websites, such as a guy extranet website, hand extranet, internal intranet, and intranets someone is concerned separate departments. If there are not surveillance concerns in the website architectures, they can be merged into a unique server using practical hosting technology, which reduces running and administrative up above and the sum up of different servers required to prop up the business.