It seems that every year is supposed to be "the year" for Linux, but nobody ever manages to define what "the year" really means. You can find statistics on Linux adoption from a variety of research firms but all seem skewed to represent whatever agenda that firm is pushing-whether that is Linux adoption rising, falling, or stagnating.
There is no centralized way of counting Linux adoption because so many stories are anecdotal and there are so many channels through which Linux can be taken up. Rather than rely on unreliable statistics to make the point that Linux for small businesses in 2008 is a more viable option than ever, we simply need to look at the continued maturation of SMB-friendly Linux offerings.
Yes, cost. Although there is a notion that "Linux" equates to "free" this is not always the case. Many Linux distributions are indeed free, but commercial solutions such as Red Hat Enterprise Linux and Novell SUSE come with a price tag. For that investment, though, you typically receive additional software with specialized functionality as well as installation and ongoing support that you might otherwise need to contract from a third-party. Shortly, we'll look at these options in more detail.
Adding to the potentially confusing cost issue is this scenario: many major Linux distributions are available in both a fee-based commercial and a free "community" or "open" version. Generally speaking, the commercial version of a Linux distribution will include the most stable (but not necessarily newest) software packages, may include extra open source or proprietary software, and will include a support contract.
Community distributions, which can be downloaded for free, offer much of the same functionality, but may include newer and less well tested versions of software packages, lack proprietary or closed source enhancements for enterprise or multimedia, and support amounts to "you're on your own." Or, if not on your own, reliant upon volunteer support from the Linux community.
The truth is, Linux on the desktop is now mature, and for most users, any of the Linux distributions we look at for small businesses would require very little adaptation. Plus, desktop Linux users are protected from the malware threats that proliferate on Windows machines. The main limitation that remains for Linux on the desktop is application availability. For a small business that relies on particular applications that are available only for Windows-such as Quicken or Outlook-it may be more difficult to justify a Linux-based desktop.
Some commercial Linux distributions are licensed in either server or desktop versions. Typically, you can use a server version as a desktop, although it may not include as many client applications, and the vendor may not support client applications you add. Likewise, many desktop distributions also include server software, particularly for common server functions such as file sharing, databases, and Web applications. In other words, the boundaries between server and desktop Linux can be blurry, and may be defined more by licensing fees and support terms than significant technical differences.
Red Hat Enterprise Linux 5
Despite having "enterprise" in its name, RHEL is popular with many small- and mid-sized businesses, as well. Red Hat is perhaps the most established name among commercial Linux vendors, having been founded in 1995.
For server use, RHEL supports a wide range of processing platforms from single CPU machines to SMP and clustered configurations. Network storage is available with support for protocols like Autofs, FS-Cache and iSCSI. And Microsoft integration is enhanced with ActiveDirectory support and Microsoft file and printer sharing.
In a desktop environment, RHEL uses Gnome, an interface that is easy to learn for both Windows and Mac users. RHEL 5's most significant new feature is its integration with Xen virtualization, meaning that it includes out-of-the-box support for running virtualized OS environments, which may include additional or earlier Red Hat releases, other Linux distributions, or even Windows.
Because the components in this commercial Linux distribution are well-tested, RHEL is certified for 600 hardware configurations, and can run over 1000 certified applications. A Basic license costs $349 per year and includes Web-based support, while a $799 Standard license buys 12x5 phone support.
In addition to their Enterprise Linux release, Red Hat also sponsors Fedora, the community edition oriented toward developers and enthusiasts. Fedora contains many of the same components as RHEL 5, but you can download and install it for free no licenses to buy.
Unlike RHEL, Fedora is developed on a more rapid timeline six-month releases versus eighteen-month releases for RHEL. This means that the software versions of Fedora components have had less time to be tested. The idea is that Fedora is a test bed for software that may eventually find its way into RHEL, should it prove useful and stable enough. Likewise, Red Hat provides no formal support for Fedora, although there are thriving Web communities you can use as a resource.
For a particular small business, there is not necessarily one right choice between RHEL and Fedora. As a general guide, a very small business with technical aptitude but a limited budget might be drawn toward Fedora, while a larger small business with a more complex operation could benefit from the proven stability and support behind RHEL.
Novell SUSE Linux 10
Red Hat's biggest competitor is Novell SUSE, a commercial/community Linux distribution that is developed according to the same model as RHEL/Fedora. Also like RHEL, SUSE is divided into a server and a desktop product, known as SLES (SUSE Linux Enterprise Server) and SLED (SUSE Linux Enterprise Desktop). Again, the server product does include a desktop environment and can be used that way, although it includes fewer client applications than the full-blown SLED.
For most practical purposes, SLES and RHEL provide very similar feature sets. SLES includes Novell's AppArmor security (application-specific permissions) and their highly praised YaST tool, a kind of all-in-one system control panel and installed software manager. Like RHEL, SLES includes integrated virtualization using Xen. On the desktop, SLED includes both Gnome and KDE interfaces. While Gnome is typically considered more accessible for the average user or Windows refugee, KDE is considered by many to be a more powerful desktop and is often preferred by enthusiasts.
To drive home the point of how closely matched these two Linux giants are, the entry-level licenses for SUSE are priced at $349/year and $799/year exactly the same as RHEL, with equivalent support terms.
Whereas RHEL has its free Fedora counterpart, SUSE has OpenSUSE. The model here is the same OpenSUSE is a Novell-sponsored community distribution. Like Fedora, it is released on a much faster cycle than its commercial counterpart, and therefore contains "bleeding edge" software that provides the latest features at the possible cost of less testing for stability and compatibility.
For example, SLED includes KDE version 3.3, an older but mature desktop. OpenSUSE includes KDE 4, a major upgrade with a much "sexier" desktop environment. But KDE 4 is still under active development and, while it will "mostly" work, issues may arise and there is no formal support to rely on.