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    Debianintro Debianintro Presentation Transcript

    • Debian Intro Introduction to the Debian Operating System Teo Romera
    • Index
      • Introduction
      • Debian Size
      • The Debian Philosophy
      • Release Strategy
      • The Advanced Packaging Tool
    • Let's start with you
      • What do you know about Debian?
      • How do you use Debian?
      • What do you like about Debian?
      • What you do not like about Debian?
      • I switched from Red Hat Linux 5.1 to Debian Slink in June 1999...
      • ... switched to Ubuntu in Nov. 2004.
    • Introduction
      • Debian GNU/Linux Operating System
      • Started in 1993
      • Founder, Ian Murdock (Debra)
      • One of the largest FLOSS projects
      • One of the most successful FLOSS projects
      • Influential: base for many other distributions
    • Introduction
      • Unique in its instance towards the philosophy of Free Software
      • The Advanced Packaging Tool
      • Strict quality control for the releases
      • Feature based release management
      • Pure FLOSS development processes
    • Debian Size
      • Probably the biggest FLOSS project
      • +26000 software packages
      • Supporting 11 different architectures
      • +1000 contributors
    • Debian Size
      • Debian size over time
    • Debian Size
      • “ Measuring Etch: The size of Debian 4.0” by Juan José Amor et alt.
      • Windows XP ~40.000.000 SLOC
      • Fedora Core 3 ~70.000.000 SLOC
      • Debian ~280.000.000 SLOC
      • ... that means 10.000.000.000 $ with COCOMO!
      • http://libresoft.dat.escet.urjc.es/debian-counting/
    • Debian Size
      • The Linux kernel size grows exponentially
    • Debian Size
      • What do you think about this growth rate?
      • Do you think this applies to Debian too?
      • “ Every year (plus a month or so) both the total number of projects and lines of code double! The interesting question is: Can Open Source sustain this exponential growth?”
      • -- Amit Deshpande
    • The Debian Philosophy
      • Debian is in the FLOSS hard wing
      • The Debian Free Software Guidelines are the foundation of the OSI's Open Source Definition
      • There is also The Debian Constitution and The Debian Social Contract
      • These documents formalize the Debian Philosophy
      • Software for the Public Interest
    • The Debian Philosophy
      • The Debian Social Contract
        • Debian will remain 100% free
        • We will give back to the free software community
        • We will not hide problems
        • Our priorities are users and free software
        • (Allow) Works that do not meet our free software standards
    • The Debian Philosophy
      • The Debian Free Software Guidelines
        • Free Redistribution
        • Source Code
        • Derived Works
        • Integrity of the Author's Source Code
        • No discrimination against persons or groups
        • No Discrimination Against Fields of Endeavor
        • Distribution of License
        • License Must Not Be Specific to Debian
        • License Must Not Contaminate Other Software
        • Example Licenses
    • The Debian Philosophy
      • All Debian packages are structured in three groups
        • Main: They follow the DFSG
        • Contrib: They follow the DFSG, but their dependencies may not do it
        • Non-Free: They do not fulfill the DFSG
        • ...
    • The Debian Philosophy
      • What do you think about the Debian Philosophy? Is it too strict?
      • What licenses do you believe to be accepted by Debian?
      • Can you find out what is happening with Debian, the GFDL and its invariant sections ? What happened back in 2005?
    • Release Strategy
      • FLOSS is characterized by a highly iterative development model
      • With frequent releases
      • But there is always problems with stable releases
      • Coordination is specially difficult in release time
    • Release Strategy
      • Types of releases in terms of the audience they are intended to
        • Development releases: for developers and experienced users
        • Major releases: for users, well tested, full of features and functionality
        • Minor releases: updates, critical defects, security bug fixes
    • Release Strategy
      • Types of releases in terms of the release strategy
        • Feature based releases: when a set of features is ready and tested. Traditional software development.
        • Time based releases: there is a planned date for the release. Features that are not ready then, are not included in the release.
    • Release Strategy
      • Debian follows feature based releases
      • The Debian branches
        • Etch (Current Stable Version): security updates
        • Lenny (Current Testing Version): stability and newer updates. Most used.
        • Unstable (sid): may not work as you expect
      • Ever used sid for a while?
    • Release Strategy
      • Very strict criteria for a package to be included in a release
        • It sits in unstable for a time
        • Less release-critical bugs than the one in testing?
        • Compiles for all the architectures?
        • The same for all its dependencies?
        • Then take it into testing
        • The package freezes when testing does
        • There is a new release
    • Well, not as simple as that... http://en.wikipedia.org/wiki/Image:Debian-package-cycle.png © Martin F. Krafft
    • Release Strategy
      • The Debian project suffers from increasingly delayed and unpredictable releases
      • Debian Sarge 3.1 planned for Dec. 2003 and finally released in June 2005
      • Software that is considered out of date
      • Did not run on modern hardware
    • Release Strategy
      • What do you think about this release strategy?
      • How would a time based release strategy affect Debian's robustness and security?
      • ... and popularity?
      • Do you think Ubuntu is more popular because it uses time based releases?
    • The Advanced Packaging Tool
      • APT has always been the killer feature of Debian (IMHO)
      • APT brought more users to Debian
      • Previously there was dselect
      • Ever used dselect ?
      • Do it now...
      • ... you will want to swallow your tongue and die in horrid pain
    • The Advanced Packaging Tool
      • “ I was attacked by dselect as a small child and have since avoided debian”
      • -- Andrew Morton
      • (Linux Kernel developer)
    • The Advanced Packaging Tool
      • Nowadays Synaptic, KPackage or aptitude are front-ends to APT
      • APT can:
        • apt-get update
        • apt-cache search for new packages
        • apt-get upgrade packages
        • apt-get install or remove packages
        • apt-get dist-upgrade distributions
    • The Advanced Packaging Tool
      • Some tips for APT
        • Try it with bash_completion
        • Install apt-file
        • Apt pinning = Lock Version in Synaptic
    • Some Links
      • The Debian Project
            • http://www.debian.org/
      • The Debian Reference
            • http://www.debian.org/doc/manuals/reference/
      • The Apt HOWTO
            • http://www.debian.org/doc/manuals/apt-howto/
      • Release Management in Free Software Projects: Practices and Problems, by Martin Michlmayr et alt.
            • http://www.cyrius.com/publications/