free and open source software (foss) · expert meeting on free and open source software: policy and...
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ehesham.cu.edu.egehesham@cu.edu.eg
Free and Open Source Software (FOSS)
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Agenda• Introduction.• FOSS World Wide.• Indicators.• Apache• PHP (What/Why/How)• MYSQL (What/Why/How)• FOSS for Africa
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UNCTAD Expert Meeting on Free and Open Source Software:
Policy and Development Implications
Session 3: Government Usage and Policy23 September 2004
“Technological Neutrality in Software Procurement: The Soundest IT and Procurement Policy”
Robert Kramer, VP of Public PolicyComputing Technology Industry Association
Executive Director, Initiative for Software Choice
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• Global ReachØ 16,000 Corporate Members in 102 countries, Ø Over 4,000 institutional members and 8,000 IT professional
(individual) membersØ 85%+ of our corporate members are SMEs
• InclusiveØ Members from major industry markets, representing all in the IT
industry; Hardware; Software; Telecommunications; IT Services; IT training;
Ø Corporations and not-for-profit organizations/ Schools, Community Colleges and Universities/government partnerships
• EffectiveØ Largest vendor-neutral provider of IT training certifications,
including Linux+Ø Successful track record of collaboration and facilitation of global
standardsØ Industry driven through members ‘cornerstone’ process
CompTIA: A Global ITC Trade Association
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London
Amsterdam Düsseldorf
Tokyo
Singapore
JohannesburgSydney
Toronto
International Offices
Chicago, HQWashington DC
Sao Paulo
Hong Kong
BrusselsOttawa
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FOSS on the Internet• In use on over 5.5 million domains
• Market share of Internet webservers– Apache : 60%– IIS servers (ASP) : 30%
(from http://www.netcraft.com/survey/)
F:\courses2004-2005\InternetTech\webpage\h.htm
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Apache
Apache: “Industrial strength” HTTP/1.1 compliant web server
• Highly configurable• Implements many features in addition to its core
functionality (e.g., security/access control, virtual hosting, CGI script execution, …)
• Extensible with third-party modules (e.g., servlet engine, security, WebDAV, …)
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Modules for Apache• mod-ssl (secure HTTP communication
between a browser and a web server): – Provides strong cryptography for privacy– Provides use of digital signatures for data integrity– Allows server and/or client authentication– Integrates SSL/TLS protocols w/ Apache (via
OpenSSL)• mod-dav (publishing into the web
environment):– Provides server support for WebDAV (web-based
distributed authoring and versioning)– Implements WebDAV extensions to HTTP 1.1
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APACHE
bin conf libexeclogs
htdocs securedocs
(more)
Apache is:•Full-featured and extensible•Efficient•Robust•Secure (at least, more secure than other servers)•Up to date with current standards•Open source•Free
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Why PHP ?• FOSS technology (Low cost)• High performance• Interfaces to many different database
systems• Built-in libraries for many common Web
tasks• Ease of learning and use• Portability• Availability of source code
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• Netcraft Statistics– 11,869,645 Domains, 1,316,288 IP Addresses
(Hosting + domain name) cost about 110$/year
About 1.3 G$ …
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CLIENT
WEB SERVER
HTTP Request(url)
<HTML><?php PHP code ?></HTML>
Gets Page
<HTML><B>Hello</B></HTML>
Interprets the PHP codeServer response
Browser createsthe web page
Hello
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What is a PHP script ?• Code embedded within tags : jumping
between HTML and PHP (like ASP and Cold Fusion)
• No heavy code to output HTML (as needed in Perl or C)
• PHP code is enclosed in special start and end tags
<html><head><title>Example</title></head><body><?php
echo "Starting to write a PHP script"; ?></body></html>
HTML tags
PHP code
HTML tags
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PHP is server-sideWhat the web server sees (and executes on-the-fly)<H1>Greetings</H1><P ALIGN="center"><?phpprint ”Hello GEN!";?></P><HR>
What the web browser receives (it never sees PHP code)<H1>Greetings</H1><P ALIGN="center">Hello GEN!</P><HR>
=> it is not possible to copy the source code from the web browser
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Three-tier architecture
Web brow
ser
Presentation tier
Database server
Data storage tier
Web server
API
CG
IPH
PJSP
Business Logic tier
ASP
CFThin client
Thick server
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System requirements• Operating systems :Linux, many Unix
variants (HP-UX, Solaris and OpenBSD, ...), Microsoft Windows, Mac OS X, RISC OS, …
• Web servers : Apache, Microsoft Internet Information Server, Personal Web Server, Netscape, iPlanet, Oreilly Website Pro server, Caudium, Xitami, OmniHTTPd, Zeus, ...
• Databases : Oracle, Informix, Sybase, InterBase, PostgreSQL, MySQL, ODBC, ...
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Get the software FOSS⇒http://www.h-elmahdy.net/graphics/htools.htm 14.3MB⇒http://www.h-elmahdy.net/graphics/books.htmOr from the CD distributed
• After uploading and unzipping you get:
• Double click on this file• It takes about five minutes.• You will get this:
How to install PHPTraid ? (1/4)
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How to install PHPTraid ? (2/4)• Get the clean run of the Apache, like this
Not like this:
• Your folders in the C:\ drive will have:• Getting your IP address, from DOS
Command Prompt, type ipconfig /allif you are using the free Internet
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How to install PHPTraid ? (3/4)Or use the TCP/IP properties
Now, you are ready to use your computer as a web server:
In the Internet Explorer, in the address bar, you can use
Server is a process, Client is another process. Both of them can be run on the same computer
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How to install PHPTraid ? (4/4)Now, everybody can see you in the internet at your IP address
All accounts to be put under this folder
You have to name the first file index.html of the main account and for each account
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First PHP (to pass parameters)
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First PHP (to get parameters)
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Second PHP (Write to a file)
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Third PHP (Content of a file)
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Advantages of PHP• Easy to learn… availability of source• Free and open development
(independence, security, community)• Native database connectivity (mysql,
ODBC, …)• Availability for a variety of platforms
(Windows, UNIX, Linux, Mac OS, RISC)• Simple but powerful, thin client• Many functions (databases, mail server,
PDF, …)
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Disadvantages of PHP• Immature language
• Mixing of HTML and program code : disorganization (application and layout not always well separated), bug prone
• Going to the server every time
• PHP programs are compiled at execution time, and they are distributed in clear text, so it needs more time and effort to be protected
• Can not be integrated with non-based applications
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MySQL• MySQL is a very popular, open source
database.• Officially pronounced “my Ess Que Ell” (not my
sequel).• Handles very large databases; very fast
performance.• Why are we using MySQL?
– Free (much cheaper than Oracle!)– Each one can install MySQL locally.– Easy to use Shell for creating tables,
querying tables, etc.– Easy to use with Java JDBC
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§ SQL provides a structured language for querying/updating multiple databases.
§ The more you know SQL, the better.§ The most important part of SQL is learning to
retrieve data.§ selecting rows, columns, boolean operators, pattern
matching, etc.
§ Keep playing around in the MySQL Shell.
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Adjusting MySQL shell path
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Running MySQL shellRunning the MySQL
Run Command Prompt,
then type mysql
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MySQL line commandsList all databases on the sql server:
To delete a db:
Create a db:
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MySQL line commandsUse a db:
Create a table:
Loading data from a file:
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PHP program uses MySQL
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PHP program uses MySQL
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PHP program uses MySQL
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PHP program uses MySQL
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