Virtualization and Linux--A Primer - page 2
Why the Hooplah?
Consolidating services onto fewer machines is appealing because they are easier to manage, and you can put that unused capacity you already paid for to work. Or, when you buy new gear, get a single high-quality machine with redundant hot-swap server-quality everything, instead of a gaggle of lesser boxes.
Virtualization isn't a new idea; IBM's VM operating system has been hanging around since the early 70s, and today a single zSeries mainframe runs thousands of concurrent Linuxes. (Remember the famous IBM commercial, "The Heist"? That's what that was about.) Of course IBM wants you to blow a million clams on their stuff, but virtualization works just fine on lower-end systems too.
The basic concept in all virtualization technologies is sandboxing. Applications and operating systems run in discrete environments, completely protected from each other, and strictly limited in how many system resources they can consume. That's the theory, anyway. It's like having a whole bunch of computers in one, and they can interact with each other just like a physical herd of computers. It's a great development and testing environment, a test-lab-in-a-box. You can test networking, cross-platform applications, multiple Web browsers, and clustering. Use it for secure shared Web hosting, provide multiple secure user environments for shared PCs, and safely give them root accounts. The latter is especially useful for companies that have continual streams of perma-temps rotating through.
Solid state disks (SSDs) made a splash in consumer technology, and now the technology has its eyes on the enterprise storage market. Download this eBook to see what SSDs can do for your infrastructure and review the pros and cons of this potentially game-changing storage technology.
- 1Linux Top 3: GNOME 3.12 and New Betas for Ubuntu 14.04 and OpenMandriva Lx 2014.0
- 2Linux Top 3: Linus Lashes out, Linux 3.14 Gets PIE and Ubuntu One is Done.
- 3Linux Top 3: Ubuntu 14.04, Debian Gives Squeeze More Life and Red Hat Goes Atomic
- 4Linux Top 3: RHEL 6.5, Debian 7.2 and EOL for Linux 3.0.x
- 5Linux Top 3: CoreOS, Oracle Enterprise Linux 7 and Ubuntu 14.10