Practical Exercises 


 To be completed due by 2/2/2005
  • Backup the original system configuration.
    Generate a list of installed packages on your desktop and store it in a file: 
    dpkg -l > old_system.txt
    Archive some configuration files on your system: 
    cd /etc
tar -zcvf old_system.tgz   hosts hostname resolv.conf X11
    Get a blank floppy; format it with ext2 file system; mount it; copy the both created files onto the floppy: 
    mke2fs /dev/fd0
mkdir /floppy
mount /dev/fd0 /floppy
cp /etc/old_system.tgz /floppy
cp /etc/old_system.txt /floppy
umount /floppy
    Now you should be able to restore the original system configuration after Debian re-installation.

  • Manual system installation.
    Download floppy images of the installer boot, root and network drivers:
    boot.img
    root.img
    net-drivers.img
    Create three installation floppies: 
    dd if=boot.img of=/dev/fd0 bs=1024 conv=sync ; sync
dd if=root.img of=/dev/fd0 bs=1024 conv=sync ; sync
dd if=net-drivers.img of=/dev/fd0 bs=1024 conv=sync ; sync

    Boot the system from the boot floppy and follow the installer instructions. When prompted for the installation type, choose
    http
    Edit countries list by hand
    Enter information manually
    for host type in: 192.168.5.55; for directory: /debmirror. It is obvious to choose the nearest Debian mirror. In our case, it is a server in the Unisys lab. If you live on campus and want to install Debian on your computer in the dorm, choose debian.rutgers.edu.
    For partitioning, you can choose the following layout, or stay close to it: 

      IDE1 master (hda)   
        #1 primary    256 MB     ext3       /
        #2 primary    512 MB     swap       swap
        #5 logical    512 MB     ext3       /var
        #6 logical    3.0 GB     ext3       /usr
        #7 logical    1.0 GB     ext3       /tmp
        #8 logical    leftover   ext3       /home

    In this exercise, you don't care about installing various software since the system is going to be reinstalled again in the next exercise. To save time, install only the base system. At the second installation stage after reboot, create root account, skip software installation and APT configuration. Now you should be able to login into the new system as root. proceed with "Finish configuring base system".

  • Semi-automatic installation
    Boot the system from the boot floppy. At the prompt, type the following boot parameters: 
    linux preseed/url=http://192.168.5.250/preseed/preseed.cfg debconf/priority=critical
    When prompted, chose the default language, English. Then just wait until the installer finishes the installation. At the second stage, after reboot, skip software installation and proceed with "Finish configuring base system". You should be able to login as root with password "r00tme", specified in preseed.cfg file at http://192.168.5.250/preseed/preseed.cfg. Change the root password upon the first login.

  • Restore the original configuration
    As you may have noticed, the newly installed system is not configured and lacks a lot of useful software, for example, you can not run startx since the XFree86 is not installed; the host name is the default, debian. Mount the floppy with the two files created in the first exercise and copy the one with the configuration archive: 
    mkdir /floppy
mount /dev/fd0 /floppy
cp /floppy/old_system.tgz /etc
cd /etc  	
tar -zxvf old_system.tgz
    Reboot the system. Now you see the host name shows as it was on the old system.

    Configure APT: 
    apt-setup
    Choose edit sources list by hand. It will start nano editor. In the editor, write the following entries then exit with saving (Ctrl-X): 
    deb http://192.168.5.55/debmirror sarge main contrib non-free
deb http://security.debian.org/debian-security sarge/updates main contrib non-free
    Run update for apt: 
    apt-get update

    Copy file old_system.dat from the floppy into your home directory. Generate a list of installed packages on your new ystem and store it in a file: 
    dpkg -l > new_system.txt

    Comparing files new_system.txt and old_system.txt, you can see what packages have not been installed on the new system. To compare the content of the two files, download a script, make_update_list.sh. Since you don't have a browser at this moment, install wget and fetch the file with it: 
    apt-get install wget
wget http://linuxcourse.rutgers.edu/lessons/lesson2/make_update_list.sh
    Make the script executable and run as follows: 
    chmod u+x make_update_list.sh
./make_update_list.sh old_system.txt new_system.txt
    The script will generate a new file, diff.txt, which contains the list of the packages which were installed on the old system and are not installed on the new one -- about 130 packages as shown by 
    wc -l diff.txt

    By using APT, install ssh: 
    apt-get install ssh
    Similarly install the following packages: 
    xserver-xfree86
xfonts-base
xbase-clients
fvwm
xterm
xemacs21
vim
mozilla
less
gcc  g++  g77
make  autoconf  autotools-dev  automake
    Again, check the number of the absent packages: 
    dpkg -l > new_system.txt
./make_update_list.sh old_system.txt new_system.txt
wc -l diff.txt

    Upgrade the kernel to 2.6. To check what the kernel the system is running, execute command 
    uname -r
    Find the latest available kernel package for "686" kind of system: 
    apt-cache search kernel-image-2.6 | grep 686
    As of now, the latest available kernel package is kernel-image-2.6.8-2-686. Run apt to install it: 
    apt-get install kernel-image-2.6.8-2-686
    Reboot the system and verify that it boots into the new kernel: 
    uname -r

  • Read about dpkg and APT:
    Sec. 24.2
    APT manual
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