Transcript Document

Web Servers / Deployment
Alastair Dawes Original by Bhupinder Reehal
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What is a web server?
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Computer with a software package
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Manages and shares web based applications
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Files retrieved via a web browser
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Using HTTP protocol
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Accessed via IP address/Domain name
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Types of Servers
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Local
Service Providers
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Issues with Web Servers
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Local Server
Security
 Maintenance
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Service Providers
User Support
 Limited support of technology
 Sensitive information exposed
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Local Servers
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Testing purposes
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Windows
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Time consuming to upload to external server
IIS
Download and Install web server software
Apache Web Server
 Abyss Web Server X1
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Apache Web Server
“. . .63% of the web sites on the Internet are using
Apache, thus making it more widely used than all
other web servers combined"
Apache.org
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Install server before any other technologies
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PHP
MySQL
Configure themselves for the server
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Using Apache Web Server Software
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Database and PHP hosted on
Server
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PHP executed on Server
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Install
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Web Server Software
MySQL Database
PHP
Front end for MySQL database
(optional)
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MySQL Control Centre
MySQL Administrator
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Using Internet Information Server
(IIS)
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Installed on Windows 2000 server by
default
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Use Add/Remove to install components
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Use Inetpub root directory to store files
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To access files
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http://servername/filename
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Web Server Requirements
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Server must support
Database
 Server Side Scripting Language
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Unable to communicate without support
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If using a Service Provider
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Where will the database be stored?
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Database with a Service Provider
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Most provide a GUI
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Create database and tables online
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Update database via service provider
website
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Import and export your database
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How secure is your web server?
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Public websites are hacked on a daily basis
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Hackers may be seeking to:
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Embarrass an organisation
Placement of illegitimate material
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Can your files be easily accessed?
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How will you protect your server?
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Firewall Security
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Firewall Security
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Protect using
Software Firewalls
 Hardware Routers
 Wireless Routers
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Protects against unauthorised access and
viruses
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Windows XP in-built firewall
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Software Firewalls
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Good for single computers
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Pro’s
No requirement for additional software
 No requirement for additional computer wiring
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Cons
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Speed – uses system resources
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Hardware Routers
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Provide protection for multiple computers
 If
they have a hardware firewall
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At least 4 network ports
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Requires wiring
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Wireless Routers
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Allows wireless connection
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Excellent for laptops,
PDA’s etc
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Unauthorised access
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Encryption
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Wired Equivalent Privacy (WEP)
Wi-Fi Protected Access (WPA and
WPA2)
Neighbours
People outside home
Not always available with
built-in firewall
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Importance of a Firewall
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Hackers with malicious intent
Delete information
 Crash machine
 Steal personal information
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 Passwords
 Credit
Card Numbers
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Maintenance
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Keep software up to date
Web Server software
 Firewall security
 Virus checkers
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Regular virus checks
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Regular Back-ups
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How will your web files be
accessed?
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Client/Server Communication
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A web browser is a client
program that requests services
from a web server
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Hypertext Transport Protocol (HTTP)
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The web server responds to the
request
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File requests also made using File
Transfer Protocol (FTP)
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Client/Server Communication
Example
Client requests details from bank using HTTP
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Web page deployment
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Web files need to be:
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Stored
Retrieved
Updated
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How will files be transferred?
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Local Server
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Transfer to root folder
External Server
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FTP
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What is FTP?
File Transfer Protocol
 Transfers files between server and client
 Two Basic operations
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Downloading
 Uploading
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How to use FTP
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Requires username and password
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Easily accessible using web browser
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Different protocol identifier e.g. HTTP or FTP
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ftp://username:[email protected]
Command Line
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Anonymous – not secure
Using and ‘Get’ and ‘Put’
FTP Programs
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Provide a GUI
CuteFTP, FileZilla, SmartFTP
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Using a web browser - IE
Upload
Download
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Using Command Line
Open FTP connection
Enter username and
password
Use ‘Get’ command to
download a file
Use ‘Put’ command to
upload a file
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Using an FTP program SmartFTP
Username
Client
Files
Password
Files on
Server
Transfer
Queue
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Summary
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Web server setup
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Protecting your server
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Maintenance
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Web page deployment
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