Hi fellas, Here is a ppt which helps you to have some basic idea on Web servers, Application servers, Shared and Dedicated Hosting, Back up server and SSL concepts... Technology pool is amazingly very vast. This is a drop of it.

1. Sasin Prabu
26.12.11

2. Contents
Servers
 Web server
Apache Tomcat
 Application Server
Weblogic server
Shared Hosting & Dedicated Hosting
 Admin Server
 Managed Server
Entry level configuration
Multi server configuration
Enterprise server configuration
SSL
 Back up Server

3. Web Server
 A web server is a specialized type of file server. Its job is to retrieve files
from the server’s hard drive, format the files for the Web browser, and
send them out via the network. Web servers are designed to do a great
job of sending static content out to a large number of users. The pages
delivered by the server are expected to be the same for everyone who
visits the server.
 The function of a typical Web server is shown below. The user requests
a web page. The Web Server finds the web page file in a local directory
and sends it back out to the user. When graphic files are requested, the
same thing happens. The Web Server finds the requested graphic files
and sends them back to the user.
 The Web Server standards were originally designed to publish static
documents on the Internet. There was a limited capability for accessing
dynamic content, but this was never intended to support high volume,
highly interactive Web applications.

4. How a Web Server works

5. Apache Tomcat is a Web server
 Tomcat is an open source web server developed by
Apache Group. Apache Tomcat is the servlet container
that is used in the official Reference Implementation
for the Java Servlet and Java Server Pages(JSP)
technologies. The Java Servlet and Java Server Pages
specifications are developed by Sun under the Java
Community Process. Web Servers like Apache Tomcat
support only web components.

6. Application Server
 Application servers are designed specifically to extend
web servers to support dynamic content. The
application server software “hooks in” to the web
server software and automatically intercepts any user
requests for dynamic content. The web server still
sends out static web pages and graphic files–Just like
before. But now, the application server can create
dynamic content by mixing data with templates,
running programs, or by accessing databases.

7. How an Application server works?

8. Weblogic is an Application server
 Its a Java Application server by BEA.
Unlike normal Webserver(like Apache, Tomcat..) which
just handles HTTP type request, the application server
handles business logic to application programs through
any number of protocols
 One can do much more than server static files with web
logic application server. They contain tools to deploy and
manage java programming environment including JSP,
servlets and EJB (Enterprise Java beans, creates Business
Logic). As an application server weblogic also provides you
a "managed" environment including transactions,
connection pools etc.

9. Shared Hosting and Dedicated
hosting
 Shared hosting, sometimes called shared services or virtual
hosting, is simply when multiple web sites share the same server,
thus reducing the cost for everyone. The only real problem with
shared hosting is if the host has put too many sites on one server.
 Dedicated Hosting comes in various configurations
depending on your requirement. All servers will at least
be managed at hardware layer. This allows maximum optimized
performance. This server is not shared with anybody and entire
server's resources are exclusively available to drive your business
applications.
 For instance, We will see Dedicated Hosting in WebLogic server.
In the coming slides.

10. Admin Server
Administration Server Can be only one for a Domain,
which works like a Central Configuration/Monitoring
controller for the entire domain. AdminServer helps us
to Migrate Servers and Services within the domain.
AdminServer helps us to Deploy Applications within
the domain…targeted to ManagedServers/Clusters or
targeted to AdminServer itself.

11. Managed Servers
 Managed Servers are similar to the Administration
Servers, except few differences. Like Managed Servers
will not have Administration Console Application
(consoleapp) deployed in it.
 The benefit of using Dedicated hosting is that your
website or application performance will not be effected
by high traffic websites that would have been sharing
your servers bandwidth. Moreover, it is more flexible
than shared hosting, as webmasters have full control
over the server, including choice of operating system,
hardware.

12. How Managed Servers interacts with Admin
Server?
 The Administration Server stores the master copy of the domain
configuration, which contains all the configuration for all managed
servers in the domain including other resource configurations like
DataSource, JMS resources, WLDF , mail Session…etc configurations as
part of the “config.xml” file.
 If AdminServer is already started then while startup operation of
Managed Server, it connects to the Administration Server to
synchronize the configuration and in case of any modifications in the
“config.xml” it collects those changes from the AdminServer.
 If AdminServer is not already running and if we will try to start
Managed Servers (in MSI Mode) then Managed Servers get the Cached
Configuration file which is provided by the NodeManager with the
name of “msi-config.xml”.
 The types of configurations are as follows:

13. Entry Level Configuration
 Entry Level Configuration allows a webmaster to rent an
entire server. This server is not shared with anybody. This is
more flexible than Shared hosting as webmasters have full
control over the server, including choice of operating
system, hardware, etc.
 Unlike shared hosting, a managed server's entire resources
are exclusively available to drive your business applications.
It represents the advantage of helping you manage your
costs without upfront hardware expenditure and the ability
for technological advancements as your business
requirements grow.
 Running a managed server is all about control, resources
and flexibility

14. Entry Level Configuration

15. Multiple Server Configuration
 Made up of at least 2 servers and may have as many as
several hundred servers. There are usually web servers,
application servers and middleware, and database serevrs
in high-availability configurations, together with network
and security infrastructure. Supported technologies
include the Windows, Linux and Solaris operating systems;
the MySQL, Microsoft SQL Server and Oracle databases;
common Java 2 Platform, Enterprise Edition (J2EE)
application servers, such as JBoss, WebLogic, WebSphere;
Microsoft products, such as Biztalk Server and Commerce
Server; and application servers for open-source languages,
such as Perl, PHP and Python.

16. Multiple Server Configuration

17. Enterprise Server Configuration
 This is operational support for enterprise applications,
such as customer relationship management, enterprise
resource planning (ERP) and sales-force automation.
These configurations are typically made up of at least 6
servers and may be very large. They may be managed
in conjunction with a system integrator or other
external service provider.

18. Enterprise Server Configuration

19. SSL
What is SSL?
 Secure Sockets Layer (SSL) is a global standard security technology developed
by Netscape in 1994. SSL creates an encrypted link between a web server and
a web browser to ensure that all data transmitted remains private and secure.
Millions of consumers recognize the "golden padlock" which appears in their
browser to indicate they are viewing a secure webpage.
Why do I need SSL?
 Gain competitive advantage by appearing more trusted and more legitimate.
 Provide assurance to your customers that their data cannot be tampered with
or forged.
 Ensure that your customer's data is transmitted securely.
SSL and HTTPS
 An SSL session is started by sending a request to the Web server with an
HTTPS prefix in the URL, which causes port number 443 to be placed into the
packets. Port 443 is the number assigned to the SSL application on the server

20. SSL

21. Back up Server
 This is a Hosted Continuous Data Protection solution
to backup your server contents. The solution enables
disk-based data protection, disaster recovery and bare
metal restore for servers and workstations running
Linux and Windows systems/ It is the first high
performance backup and restoration product for
MySQL and the only software to offer True Granular
Restore for MySQL.

22. Back up Server

23. Enjoy Learning the Technologies.....