Ubuntu Server is a fast, free, no-frills Linux distribution that fills a niche between utilitarian Debian and the GUI-driven and, some would argue, over-featured Novell SUSE and Red Hat Enterprise Linux.
Ubuntu Server: OEM opportunities
These selections map to popular uses of Linux servers, and an 'OEM' installation can also be made that makes a distributable 'cut' of Ubuntu server for pre-installed application server deployments.
The OEM 'cut' can 'ask questions' of end-user installers to configure or setup the server via a text-based interface. Before this version, only UbuntuDesktop could use the OEM tools, as they were GUI only.
These considerations and options are reminiscent of far older VAR (value added redistributor/developer-sourced) versions of Xenix, UnixWare, and other i386/486 versions of Unix, and hints at the potential for this totally zero-cost Linux distribution.
In fact, the only thing you can buy is extended support, as the first 18 months of support are free. If 'free' wasn't enough, it's also possible to strip out (at installation) any installation of 'non-free' (closed source or non-GPL/Apache-licensed) software, which will make free open source software (F/OSS) purists tingle.
Ubuntu 9.0.4 is a headless server operating system that's best downloaded from one of many mirror sites and is delivered in the form of an ISO image. From there, it can be burned to media or installed by various virtual machine hypervisor installer applications. We tried both methods successfully.
At installation, the default file system used is ext3, which can be simply changed to ext4, ReiserFS, or even NTFS. A script guides installation, and defaults will install only minimal components, which we like.
However, when we wanted to make changes, we found some of the choices cryptic. Fortunately, each option permits IT managers to 'go back,' although contextual help is unavailable.
Instead, we looked up selections in Ubuntu's documentation, which is reasonable for non-civilian installers and comes either from online sources or a fat, downloadable PDF file.
There are two different mail-message transfer systems that can be installed (initially or later), industry stalwart postfix or exim4. The Ubuntu Server distribution includes Dovecot, which delivers POP3 or IMAP4 mail. Delivery of mail to users and list management is performed by the GNU mailman application, which is based on Python and works with either postfix of exim4.
Wikis are offered through the moin moin (mine mine) application, which is also Python (and Apache2)-based. Ubuntu Server also ships with OpenLDAP as a directory services source, as well as Windows-connecting SAMBA 3.3. There's also connectivity via the OpenChange library to Microsoft's Exchange Server (for versions prior to Exchange 2007), although we didn't test this.
We found some of the installation options interesting. The administrator home directory can be optionally encrypted. More interesting was the fact that the commands in the traditional /etc directory can be subject to versioning control, which ensures that contents placed there (usually utility commands and configuration files) can be rolled back, or examined for tampering.
The /etc directory uses the etckeeper package that connects to the Advanced Package Tool (apt), the Debian Linux command that manages packages, as in application dependencies and component relationships. Etckeeper automatically notes changes when a new package is installed or updated. You can also commit changes if you edit a file manually in /etc.
Ubuntu Server is no slouch, compared with other Linux server editions that use the same kernel (2.6.28). Using Java 1.6, the SPECjbb2005 result for Ubuntu 9.04 server (averaged more than three runs) was 42,288.67 bops compared with 42,581.5 bops for SLES 11 in our recent test. The SPECjbb2005 test largely tracks business transactions and exercises CPU and memory rather than disk and network I/O.
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