A Linux Journal Review: This article appeared in the August issue of Linux Journal.
Any current Linux distribution most likely contains the software needed to do your job, including kernel and drivers, libraries, utilities and applications programs. Still, one of the most common questions I hear is ``which distribution should I get?'' This question is answered by an assortment of people, each proclaiming their favorite distribution is better than all the rest.
My new theory is that most people favor the first distribution they successfully installed. Or, if they had problems with the first, they favor the next distribution they install which addresses the problems of the first.
Let's use me as an example. SLS was my first Linux installation. Unfortunately, SLS had a few bugs--in both the installation and the running system. This, of course, isn't a surprise since this installation took place five years ago.
Now, about this time, Patrick Volkerding came along and created Slackware. Pat took the SLS distribution and fixed some problems. The result looked the same as SLS and worked the same, but without bugs. To this day, I find Slackware the easiest distribution to install.
I have, however, progressed beyond installation problems and found some serious shortcomings in Slackware which have been addressed by other distributions. Before I get into specifics, here is a rough estimate of the number of times I have installed various distributions, in order of first installation. I give you this information to help you understand the basis of my opinions.
That said, here is my blow-by-blow analysis of what is right and wrong with each distribution. Note that this is my personal opinion--your mileage will vary.
All these distributions are easy to install and understand. They were all designed to install from floppy disk, and packages were in floppy-sized chunks. At one time, I could successfully install Slackware without even having a monitor on the computer.
There are, however, costs associated with this simplicity. Software is saved in compressed tar files. There is no information within the distribution that shows how files interrelate, no dependencies and no good path for upgrades. Not a problem if you just want to try something, but for a multi-computer shop with long-term plans, this initial simplicity can have unforeseen costs in the long run.
Yggdrasil offered the most promise with a GUI-based configuration. Unfortunately, development stopped (or at least vanished from the public eye), and it no longer offers anything vaguely current.
When I first looked at Marc Ewing's creation, I was impressed. It had some GUI-based configuration tools and showed a lot of promise. Over the years, Red Hat has continued to evolve and is easy to install and configure. Red Hat introduced the RPM packaging system that offers dependencies to help ensure loaded applications work with each other and updating is easy. RPMs also offer pre- and post-install and remove scripts which appear to be underutilized.
Version 4.2 has proven to be quite stable. The current release is 5.0, and a 5.1 release with bug fixes is expected to again produce a stable product.
The install sequence is streamlined to make it easy to do a standard install. I see two things missing that, while making the install appear easier, detract from what is actually needed:
Red Hat has evolved into the most ``retailed'' distribution. First it was in books by O'Reilly, then MacMillan and now IDG Books Worldwide. It also appears to have a large retail shrink-wrap distribution in the U.S.
Versions of Red Hat are available for Digital Alpha and SunSPARC, as well as Intel.
The Caldera distribution was assembled by the Linux Support Team (LST) in Germany--now a part of Caldera. Caldera, like Red Hat, uses the RPM package format. Installation is similar to Red Hat with the addition of the configuration save/restore option.
Caldera is different from other distributions at this time in that it offers a series of systems including various commercial packages such as a secure web server and an office suite. Caldera is also the most ``commercial feeling'' as far as packaging and presentation.
One complaint I received from a reviewer of my original version of this article is that you cannot perform an upgrade. That is, you must save your configuration files and then re-install.
Debian is one of the oldest distributions, but because development is strictly by a team of volunteers, it has tended to evolve more slowly. Since development is performed by a geographically diverse group, the ability to manage and integrate upgrades is of primary importance. To that end, you can always upgrade a system by pointing it at an FTP site and instructing it to get the latest versions of all the packages currently installed. In some cases, a service needs to be stopped. (For example, to upgrade sendmail, you would need to stop it, replace the program and then restart it.) This is all done automatically.
Debian deviates from the common RPM packaging format (although it can install RPMs) by using its own .deb format. The .deb format is the most versatile and includes dependency checking as well as pre- and post-install and remove scripts. This is why the sendmail example in the previous paragraph can be handled automatically.
The most difficult thing about Debian is the initial installation. Or, put another way, fear of dselect, the installer program. The design of dselect is old, and while it made sense when there were only 50-100 packages in a Linux install, it is out of control now that there are around 1000. A replacement for dselect is being developed and will be available in Debian 2.1.
Versions of Debian (with limited applications/utilities) are available for Digital Alpha and M68k.
S.u.S.E. is a German distribution with an installation ``look and feel'' similar to Caldera. It also uses the RPM package format and offers a save/restore configuration option during installation.
Two things make S.u.S.E. stand out from the others. First, XFree86 support tends to be better than other distributions because S.u.S.E. works closely with the XFree86 team. Second, there are more applications and utility programs in this distribution. A full installation takes over 2GB of disk space.
YAST, the install/administration tool, can handle .deb and .tgz packages as well as RPMs. Also, upgrades are quite easy and can be performed by putting in a new CD or pointing YAST at the files and telling it to perform the upgrade.
It depends. I have one system running Caldera, three running Red Hat (a PC, a Digital Alpha and a SunSPARC), two running Slackware, one running S.u.S.E. (a laptop) and quite a few running Debian. (Yes, I personally own too many computers.)
Further, there are problems with all the distributions--not the same problems, but problems nevertheless. As a result, I don't see a perfect answer--yet. This is not to say they don't work--just that each has its inconsistencies and limitations. They all suffer from the lack of a common administration tool.
At USENIX in 1997, Caldera announced a project called COAS (Caldera Open Administration System). The discussion at the conference showed there were more concepts to consider and a lot of implementation work before COAS could offer a uniform installation system that would meet the needs of the majority of Linux users.
Today, for a general-purpose system I tend to install Debian. I do, however, install other systems for other purposes. For example, I have S.u.S.E. on a new laptop because the volume of software included makes a more impressive demo system.
A better question is, ``which one should you choose?'' The answer is still, ``it depends.'' Here are some hints to help you along the way:
There is my input. Ask any other Linux user, and you will probably get a different opinion from mine. If you are not sure you have the right answer, there are some things you can do to make it possible to change distributions in the future with minimal impact.
Good luck and happy Linuxing.