A Temporary Internet Lounge

When you need an Internet access area at an event, do some advance preparation to create a custom Linux load so everything goes smoothly on the big day.

Beginning in 1939 and for most years since then, the World Science Fiction Convention has been the high point of the true Science Fiction fan's yearly calendar. In 2003, that high point was Torcon 3, the 61st World Science Fiction Convention held in Toronto, Ontario August 28–September 1. Torcon 3, like all past World Science Fiction Conventions, was run by and for fans. This meant nobody running the convention got paid for their efforts and funds were tight.

Since 1996, the conventions have featured an Internet Lounge where attendees could check their e-mail while at the convention. Given my background with Internet service providers, volunteering for the Lounge seemed the best task for me. I was working for a charity that refurbishes old corporate computers for reuse by other charities and individuals that otherwise would not be able to afford computers. Through my employer, I was able to arrange for enough computers for the convention, the only price being that they wanted their current project, torontogames.org, promoted. The only catch was that the machines would not come with any sort of operating system.

Beyond the issues of running four- to five-year-old hardware that didn't come with software, there were convention constraints, little money, little convention setup time and roughly 4,000 attendees. I looked at Microsoft Windows solutions, but we would have needed a license for each machine. When one is assessing some 28 machines at roughly $150 each, license charges would shred what budget was available. Then there were the issues of how long it would take to install the software and locking down/securing the computers so convention attendees couldn't mess things up. Microsoft wasn't a solution for this convention.

I looked at some conventional Linux distributions, including Red Hat and Debian. Although the cost and security concerns disappeared, the issue of setup time remained.

I considered the Linux Terminal Server Project, which I had used for other projects, where one master server supports a number of dumb client machines. Although the client machines could be set up quickly, there still would be a fair amount of time required to set up the servers. In addition, I wasn't sure I could get suitable server machines. Plus, the idea of possible single points of failure that could not be replaced almost instantly and cheaply made me nervous.

So I looked at Knoppix, a Debian-based Linux distribution that by default boots and runs off the CD-ROM drive, never touching the hard drive, and I realized I had the beginnings of a winner. Because of Knoppix's excellent hardware detection system, one could, in theory at least, face a dozen different makes and models of PCs with a dozen identical Knoppix disks and in five minutes have all 12 machines browsing the Internet. Knoppix, in essence, has two filesystems on the disk, a conventional ISO 9660 system used while Knoppix boots and a compressed filesystem used after the system boots. This complicates things, but it does allow Knoppix to store significantly more than 700MB of software on a conventional 700MB CD-ROM.

Still, Knoppix presented issues that needed to be addressed. First, the default screen resolution is 1024×768. Many 15" monitors do not support a resolution greater than 800×600, and I knew the majority of monitors I would be getting would have 15" screens. So, the default resolution had to change. Second, the default window manager is KDE. When planning for the convention, I did not know what sort of PCs I would be getting. If I ended up with low-end PCs, KDE would be too resource-intensive to be usable. So the default window manager had to change.

In addition, the default home page in the browsers would have to be set to the Torcon 3 site. The browser bookmarks had to be set to tourist information sites and World Science Fiction Convention-related sites. Other changes included making the startup screen and wallpaper note convention sponsors and adding Macromedia Flash support. Finally, to stay focused on the room's job, all the extras were removed.

My first step was to download and burn the latest copy of Knoppix, which at the time was Knoppix 3.4. These instructions are for Knoppix 3.4 only. Next, I assembled a development machine, a Pentium II 350MHz with 256MB of RAM, a 52x CD-ROM and a blank 6GB hard drive. I could have gone a bit lower on RAM and a bit slower on CD-ROM, but this is about as modest a machine as you would want for this sort of customization. To supplement this machine, elsewhere on my home network I had a support box that would act as an FTP server, plus a CD burner and a router was doubling as a DHCP server.

Next there was a need for artwork, namely the opening screen and the wallpaper. For the wallpaper, any 800×600 JPEG image would be fine. I saved this on the support box, as knoppix.jpg. The opening startup screen needed to be in a special 640×400, 16-color format. I got this by creating a simple under 17-color, 640×400 image and then saving it in .bmp format on the support box, as startup.bmp.

I then booted the development box under Knoppix and started a shell. The first steps were to set up a new filesystem, create the needed directories and create a file I could use later as a swap file. Some of this stuff required just over 1GB of memory (RAM + swap), so I needed to set up a swap file for a machine with 256MB of RAM. Setting up the drive for the first time, I entered:

su
mkfs.ext2 /dev/hda1
mount -o rw /dev/hda1 /mnt/hda1
mkdir /mnt/hda1/master
mkdir /mnt/hda1/source
mkdir /mnt/hda1/knx
cd /mnt/hda1/knx
dd if=/dev/zero of=swap bs=1M count=750
cd ~
umount /dev/hda1
exit

In the above code, the master directory was used to store the conventional filesystem, source was used to store what became the compressed filesystem and knx was used to store the swap file, plus the finished CD image. The above steps should need to be done only once.

I went through the following procedures several times, so I turned them into small scripts to automate parts of the disk creation task. This way I could burn a draft CD-R, show it to committee members, get feedback and adapt based on feedback. Here I erase past work, set up swap space and then copy from my current CD image to the hard drive:


su
mount -o rw /dev/hda1 /mnt/hda1
cd /mnt/hda1/source
rm -rf *
cd /mnt/hda1/master
rm -rf *
cd /mnt/hda1/knx
rm knoppix.iso
mkswap swap
swapon swap
cp -Rp /KNOPPIX/* /mnt/hda1/source
cp /cdrom/index.html /mnt/hda1/master
cd /cdrom/KNOPPIX
mkdir /mnt/hda1/master/KNOPPIX
find . -size -1000000 -type f -exec cp -p \
-- parents {} /mnt/hda1/master/KNOPPIX \;
cd ~knoppix

Now I was ready to start customizing. I started by downloading the image files from the support box and then transformed the startup image into the format I would need later:


lftp -u <<support box userid>>,<<support box
    password>> <<support box ip number>>
get startup.bmp
get knoppix.jpg
exit
bmptoppm startup.bmp | ppmtolss16 >logo.16

Next, I went to the boot filesystem to change key defaults:


mkdir ~knoppix/bootimg
chmod 664 /mnt/hda1/master/KNOPPIX/boot.img
mount -o loop /mnt/hda1/master/KNOPPIX/boot.img \
    ~knoppix/bootimg
cd ~knoppix/bootimg

From here, I edited syslinux.cfg. Within syslinux.cfg on the first and second APPEND lines, I had to change the VGA value to vga=788 and then insert the commands screen=800x600 desktop=icewm. Finally, at the end of the file I deleted a number of # signs so the final file was no larger than it was when I started. Then I saved the results.

It was time to boot the logo, so I entered:

ls -l ~knoppix/logo.16
ls -l logo.16

Space in the boot filesystem was limited; if the new logo file was the same size or smaller than the old logo, I was fine and could continue. If not, I had to go back and redo the boot logo to make it smaller:

mv ~knoppix/logo.16 .
chmod 744 logo.16

Then I had to edit the text that showed up under the logo in the file boot.msg. I ignored the first two lines, they contain the codes to load the logo image, and made sure the third line contained less than 80 characters. After saving the file and exiting, I unmounted the boot filesystem and reset the file permissions:

cd ..
umount bootimg
chmod 444 /mnt/hda1/master/KNOPPIX/boot.img

To fix the wallpaper, I used:

cd /mnt/hda1/master/KNOPPIX
mv ~knoppix/knoppix.jpg background.jpg

Had I needed to add a software package, I would have entered:


wget <<url and name of required package>>
mv <<package name>> /mnt/hda1/source

Due to the oddities of compression in Knoppix, you can have a situation where without adding or removing software you can end up with a too-large filesystem. So I removed unneeded software with:


chroot /mnt/hda1/source
dpkg -P <<name of an unneeded package>>

I got rid of games, the server and high-end office software. Whenever I added something, I had to take away something larger. Having removed these items, I was able to add the Flash plugin. License terms disallow the distribution of the plugin files with a Linux distribution, so to get around this I downloaded and installed the Flash files at bootup. To do this I edited the file /usr/bin/install_flashplugin.sh; after the first block of comments, I put in the line sleep 30 and changed the interactive line to interactive="no". I then saved the file and exited.

Next, I created the file /etc/rc5.d/S99flashplugin and added the following lines:


#!/bin/bash
su - knoppix -c /usr/bin/install_flashplugin.sh &

______________________

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I was waiting for this since long time, Need more info.

kintesh_patel's picture

I am a software developer grown in Microsoft and currently moving to Linux. I immigrated to USA from India and I see lots of Indian old aged people, who do not know how to operate computer but wants to read Online Indian Newspaper everyday on Internet to stay in touch with motherland. I was waiting for this type of (Linux based) article for them as I have lots of old computers in my basement to provide them for Internet surfing.

I gone thru this article as I received LJ, I am at beginner level, so it looked little bit tough to follow all the steps. It would be helpful if this article can expend in 2-3 part for beginner level people.

I also provide technical support to some of my relatives in Canada on phone, when their Windows gets crash. Providing this type of CD will also good for them to bring them on Internet first when their Windows has crashed.

Thanks Colin for writing this article, for which I was waiting since long long time.

Kintesh Patel
Columbus, OH

I just read your article abou

ElaineNormandy's picture

I just read your article about the Torcon Internet Lounge and wanted to let you know I was one of your users. I had been dissatisfied with Microsoft licensing trends, security issues, and business practices for some time, and using the Linux machines in the Lounge gave me a lot of confidence that a Linux desktop was feasible.

Within a month of returning home, I started running Redhat 9 on a dual boot machine, and a few months after that a local PC dealer built a white box machine for me to which I installed Fedora Core as the only operating system. We currently run three Fedora Core 3 systems, and although two of them still dual boot to Windows 98, sometimes we will go weeks without doing so.

Great article

stash420's picture

GREAT READ! This gives me hope... Linux is coming and noone can stop it!

I especially liked your workaround with the Flash plugins... brilliant!

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