The Rise of Virtual Appliances

Virtual appliances deliver focused services in a lightweight package. With all of the talk around virtualization being large system optimization, why single-purpose machines getting so much attention?

The next sound you hear will be the buzz surrounding Virtual Appliances (appliances). However, it isn’t just marketing buzz; this time it’s the real thing. Virtual Appliances are small, specially designed virtual machines that provide a single service or perform a single function. They usually have a significantly smaller operating system footprint than standard virtual machines, a single or very limited number of exposed TCP ports, and a single application. Some appliance examples are mail servers, CMS (Content Management System) servers, web database servers, groupware servers, intrusion detection systems, and dozens more. They provide these focused services in a lightweight and often free package.

So, why all the fuss over small, single-purpose virtual machines? Haven’t we been using these for years? Yes, in fact, we have been using them for years but the difference is that now there are commercial vendors who supply them, support them, and update them as they would any application or proprietary physical appliance. Virtual appliances make the vendor’s job easier in that they no longer have to support several different versions of physical systems in client data centers since virtual machines are hardware and platform independent. Keeping up with BIOS updates, firmware versions, and physical device age (product life cycle), and support issues for hundreds or thousands of client units is painful and costly. Vendor-supplied virtual appliance images available via download are ready-to-deploy and use.

Linux-based appliances have other advantages as well. The operating system is free, most of the applications are free, and it’s easy to maintain locally or remotely. Of its advantages, perhaps the most compelling of all is its customizability including the ability to install a fully functional Linux system within a very small (~500MB) footprint using a system known as JeOS (Just Enough OS)– pronounced “juice.” Most virtual appliance vendors begin with a JeOS system as a base system for a virtual appliance.

Creating a virtual appliance from a standard set of media is time-consuming and requires a high level of system knowledge to remove applications that aren’t necessary for supporting a particular application. To mitigate the need for this high competency level, some vendors (Novell and VMware) provide appliance-building software. Novell’s entry into the virtual appliance-building fray is SUSE Studio: A completely web-based, wizard-driven application (right now in alpha with limited access) that offers several options for a basic appliance (Text only, KDE3, KDE4, Minimal X, and GNOME). Currently, SUSE Studio only creates appliances for VMware or downloadable ISO or USB images but when the product moves to production, you’ll be able to create appliances in Xen, Hyper-V, VMware, OVF, and Amazon EC2 formats. VMware’s VMware Studio is a web-based application built on a virtual appliance. VMware Studio 1.0 is available as a free download from VMware. VMware Studio can be used for individual virtual appliance creation but it’s audience is ISV’s (Independent Software Vendors) or those who build appliances for public or customer consumption.

Virtual Appliance Advantages and Disadvantages


  • Downloadable Virtual Machine Images
  • Free or Low Cost — Support Fees May Apply
  • Ready-To-Use Software and Services
  • Customizable
  • Create Manually or Using Appliance Creation Tools
  • Ease of Deployment
  • Hardware and Platform Independence
  • Small Size


  • I/O Bottlenecks for Write-Intensive Data Backed Applications
  • Most Vendor-Supplied Virtual Appliances are VMware-Centric
  • High Potential for Virtual Machine Sprawl
  • Application and OS Licensing Issues

What about the downside to virtual appliances? Are there issues or concerns that would preclude one from using virtual appliances? As always, there’s a downside to any technology and virtual appliances have few but significant ones. Today, most virtual appliances are VMware only. You rarely find appliances for any other platform. This vendor lock-in may prevent some of you from embracing the idea of virtual appliances until vendor neutral or a more diverse choice for appliances hits the market. Since virtual appliances are small, easy to create, and readily available; their use may lead to virtual machine sprawl which consumes host system resources and storage.

If you’re using licensed applications or a proprietary operating system on your virtual appliances, you may run into licensing issues by deploying unlicensed appliances in your environment. Finally, virtual appliances whose applications are write-intensive, as in the case of some web databases. Disk access and I/O bottlenecks may require rethinking the decision to use virtual appliances for such an application.

Virtualization vendors are all abuzz about virtual appliances and rightly so — they are small, convenient packaged and delivered, function-focused virtual machines that provide enterprise-level service for a fraction of their value.

Don’t know where to start with virtual appliances? Try some of these ready-made ones.

Comments on "The Rise of Virtual Appliances"


Hi Ken,

Great article! For those ISVs who are new to virtual appliances, you should also know that there are physical appliance vendors out there that can take complete responsibility for bringing your application to G.A. as a virtual appliance.

One of them happens to be NEI, (http://www.nei.com/solutiondesign); who has been deploying both physical and virtual appliances for years with JeOS, remote health monitoring, updates and image backup capabilities.

The ROI/metrics behind this is based upon keeping your engineers developing new functionality for your application, rather than diverting their attention to managing the ongoing virtualization process.

- Bill


Thanks for the great article. This is a growing trend, especially for migrating physical appliances to virtual appliances. I would like to point out that in the software world the two different approaches are custom built operating systems (like rPath) or a JeOS (Just Enough Operating Systems or “Juice”, like Unbutu JeOS, Orange JeOS or Novell Suse JeOS) – all of which are Linux-based.

While I agree with wrstetso that the ROI on the software side is in developing & delivering your own applications and not re-building the underlying appliance, with the tsunami of virtualization that we have encountered with our current and new clients, the hardware appliance is becoming the horse & buggy of the ISV industry.

Not to be too biased but VMware does have a raft of free documentation on creating virtual appliances and IBM has announced free classes and an ISV program on porting applications to software appliances.

And lastly, most server consolidation ratios are much larger when software appliances are “consolidated” on to a single server.



Great, thanks for sharing this article post.Really looking forward to read more.


I wish to show my affection for your kindness supporting individuals that must have assistance with this one study. Your personal dedication to passing the message all over appeared to be remarkably useful and have regularly enabled folks much like me to get to their ambitions. Your own insightful guide implies a great deal to me and further more to my peers. Best wishes; from each one of us.


Hello Web Admin, I noticed that your On-Page SEO is is missing a few factors, for one you do not use all three H tags in your post, also I notice that you are not using bold or italics properly in your SEO optimization. On-Page SEO means more now than ever since the new Google update: Panda. No longer are backlinks and simply pinging or sending out a RSS feed the key to getting Google PageRank or Alexa Rankings, You now NEED On-Page SEO. So what is good On-Page SEO?First your keyword must appear in the title.Then it must appear in the URL.You have to optimize your keyword and make sure that it has a nice keyword density of 3-5% in your article with relevant LSI (Latent Semantic Indexing). Then you should spread all H1,H2,H3 tags in your article.Your Keyword should appear in your first paragraph and in the last sentence of the page. You should have relevant usage of Bold and italics of your keyword.There should be one internal link to a page on your blog and you should have one image with an alt tag that has your keyword….wait there’s even more Now what if i told you there was a simple WordPress plugin that does all the On-Page SEO, and automatically for you? That’s right AUTOMATICALLY, just watch this 4minute video for more information at. Seo Plugin


Admiring the time and energy you put into your website and detailed information you present.
It’s nice to come across a blog every once in a while that isn’t the
same old rehashed information. Fantastic read! I’ve saved your site and
I’m including your RSS feeds to my Google account.

Take a look at my blog post: garcinia cambogia groupon (Earle)


Whatever it is that we are printing it is apparent that we’ll need it to be
of a top quality. Whilst this is necessary in your dwelling printing, in relation to enterprise it’s even more necessary.
Often the printing we do as a part of our enterprise is for things
which are to be despatched to customers.

Here is my page: brother toner – Isidro -


It’s a quite performer and you can be assured of quality prints and copies each time, each time.

Here is my web blog :: brother toner tn450 (Vicente)


I additionally offered t-shirts using my vinyl cutter.

Here is my web-site … brother tn450 toner (Rubin)


The letters appear like they’re made out of Swiss cheese however are still very readable.

Have a look at my webpage: brother tn420 (Eulah)


Fixed Payment Plan.Representative instance: Spend £450, make 36 monthly funds of £18.25, total repayable £656.91, 29.9% APR mounted.Interest
Free Credit available if shown. Representative example: 4 years Interest Free

Here is my blog post brother toner tn450 (Inge)


Ink from the nozzle in the type of tiny droplets is used to create textual content and pictures on the

Here is my site … tn-450 (Wilfredo)


Parabens (found in moisturizers & shampoos) are a preservative, an endocrine disruptor, banned in sections of the EU, present proof of cancer, and are in further than 25,
000 merchandise inside the Skin Deep database.

Here is my site :: tn-450 (http://www.sabalanseir.com)


It is straightforward to operate, and likewise best to do issues like
change the toner.

Here is my web page brother mfc-7860dw toner cartridge


Inkredibleinks is offering the newest range of Inkjet Cartridges
, Toner Cartridges, ink and print cartridge , design to work fantastically.
With out any waste of ink with the help of newest printers with the inexpensive extra data please go to

my blog – brother tn450 toner (Ashley)


There’s plenty of work occurring in there!

My blog post brother tn450 compatible



Here is my blog: brother toner tn450 [Geraldine]


This HP compatible toner by Office Team is designed with an equivalent fit to
the unique Hewlett Packard print cartridges.

My page brother tn450 – Kraig -


The hp Deskjet 1056 is a printer, copier and scanner.

Visit my blog :: brother tn420 (Earnestine)


Refilling a laser cartridge isn’t that tough. First you need to achieve
entry to the toner hopper.

Feel free to visit my weblog tn450 (Cyril)


Use pre-folded notice cards for the bottom, or print
on any shade card stock that you’ve minimize all the way down to the scale you want.

Here is my web-site brother mfc toner


They truly work sooner than the usual inkjet cartridges.

Visit my web blog … brother tn450 – Michell,


Use a day by day facial toner.

My homepage … tn450 toner (Mildred)


During this stage the canister is agitated for 15 to 30 seconds.

Also visit my blog … brother hl-2270dw toner (wiki.umiz.at)


Please do not ask that the printer discover and pick up
graphics or photographs from one other job or a earlier job.

Also visit my homepage brother tn420 (Eliza)


For the very best, least costly laserjet m1536dnf on the net, take a look at our website.
For the most affordable prices on laserjet p1606dn toner find them right here.

My blog; brother tn420 (http://www.socialisttimes.com)


By setting them up appropriately, you may improve your panorama well being and infrequently lower the water payments too.

Feel free to visit my site: brother toner tn450 (http://democraticcity.org/index.php?title=A_Review_Of_The_HP_LaserJet_P1006_Printer)


Use the sting of your folding instrument to smooth web site at every
exit hole along the backbone. Ta da!

my website: brother toner tn450 (Dorie)


Buying solely Processed Chlorine Free (PCF)
paper can guarantee that you are not polluting your personal space with dioxins by means of
your paper provides. Your workers, your family, and even your personal physique will thank you for it later.

My web blog – tn450 toner (Melaine)


It even has a toner conserving mode and refillable cartridges.

My web page: tn-450 – Gidget,


I’d need to review 5 myths or misconceptions folks may
have on compatible laser toner cartridges.

my website – tn450 – Virgil,


Maintenance of printer density: Canon toner cartridges launch free toner into the machine.

my web blog … brother hl-2270dw toner, Rosaura,


The yield is the quantity of pages the cartridge produces before operating
out of toner.

Here is my site brother hl-2270dw toner (Tam)


Plug your laptop or battery charger in at my home and also you’re using solar
power. Actually, many factors have an effect on the amount of time that a laptop battery
can deliver energy earlier than it have to be recharged.

Also visit my page; tn-450, Thalia,


Thirty-9-yr-outdated Adrian Rodriguez pleaded guilty to second-degree grand larceny for his thefts from the agency of Fried, Frank, Harris, Shriver &
Jacobson LLP.

Feel free to visit my page: brother tn-450 (Novella)


The first and the foremost important reason of recycling
cartridges is that the recycled ink cartridges can be become one thing helpful rather
than simply throwing them into waste.

Here is my site – brother tn450 toner


I use them on a regular basis. It simply takes a minute or two to
set up index dividers and tabs, but that point is price its weight in gold once I want to find info quickly.

My blog post :: brother tn450 [Ulrich]


If you are absolutely up-to-date with the newest know-how and
have your whole gadgets connected either by means of a wireless network
or through a cloud such as Google’s Print Cloud, then you should have merely selected each and
every picture that you just wanted printing and
despatched them to print from your printer, multi function go
on the click of a button on your smartphone, tablet or desktop laptop.

Here is my blog post … tn450 (Laurel)


They take the empty cores and professionally refill and sell them back to users at
a lower cost than OEM.

Also visit my weblog :: brother tn450 (Soon)


So all you would want to do is a google image search of the
design you wish to cut.

Also visit my blog – brother toner tn450 – Junior


Machine price, provide value, binding options, binding velocity, and look of finished product are perhaps a very powerful components to consider.

My weblog – brother toner (Chase)


Print from copy machines and laser printers is especially problematic as a
result of it’s not really ink but somewhat a plastic polymer that the printer or
copier burns onto the paper.

Feel free to surf to my webpage … brother tn-450 (Torsten)


Estimates show that t the quantity of digital,
electrical and chemical waste produced in a lifetime per person within the western world is about three.3 tonnes.

Have a look at my web blog :: tn-450 (Sharron)


I loved that wheelie bin, and not in a healthy approach.

I used to have carnal ideas about it. And now it is run off to be with any previous

Also visit my blog; tn-450 (Serena)


When choosing printer supplies, at all times make certain to check the manuals for figuring
out the printer model and its corresponding ink.

Here is my web page … brother tn450 (Jamel)


Read product labels and opinions when purchasing for
biodegradable gadgets so as to add to your home, workplace or yard.

Here is my website brother tn420 (Julienne)


I nonetheless contemplate movies state-of-the-art and haven‘t
fairly bought over the demise of Betamax but.

My website :: brother tn-450 (James)


Perfect Green cartridges are manufactured to fulfill or exceed OEM requirements.
The production website is likely one of the most trendy in Europe and rigorous high quality management ensures that
the product meets or exceeds the best industry
benchmarks for remanufactured products.

Also visit my weblog … tn450 toner (Hazel)


They can ship you freepost envelopes or packing containers for your

Feel free to surf to my web blog: tn-450 (Chelsey)


If it value you $one hundred eighty to print 1040 pages and the printer costs $50, you may pay $230 for your one-12 months printer price.
That involves 22.1 cents per page. Now do the identical factor for a distinct printer and evaluate.
You just might be stunned.

Feel free to visit my site; brother tn450; Tera,


The company began as a Sole Proprietorship in 2006 with the vision of offering unmatched customer support whereas utilizing bleeding-edge net
technologies for an unprecedented customer experience. Years of onerous work and an unwavering
commitment to customer service laid the muse for what has become a multi-million dollar firm.
Beyond a meticulous approach to customer satisfaction, Mono Machines LLC has continued to
develop and broaden into new markets and continues to hunt out new alternatives.

Feel free to visit my web blog … brother mfc-7860dw toner


They present each OEM model and suitable cartridges for over 10,000 printer makes and models.
Visit if you are looking to buy a Brother MFC
toner or a Brother Toner TN at greatest price.

Here is my homepage :: brother toner cartridge


The Alienware M9750 has twin Nvidia 7950GTX graphics playing
cards, similar to the Sager NP9260 does, so you’re going to obtain extreme gaming efficiency.
With the potential of configuring twin Nvidia graphics playing cards, it’s able to dealing with quite a bit.
The graphics playing cards are admirable selections for avid gamers
and those who work with 3D apps.

Here is my weblog brother tn-450 (Aundrea)


A zendala is a mix of a mandala and a zendoodle.

Here is my webpage; brother toner – http://russiangoldcoast.com.au/?p=247881


The availability of a lot recycled paper is the explanation uncooked products
do not make up a bigger percentage of the uncooked products in paper production. Reducing the need for fresh timber in making paper
is thus an vital advantage of paper recycling.

Review my weblog brother toner tn450 (Isobel)


In a couple of week the finished cartridge is returned
to the client at an enormous savings over buying a new cartridge.

Visit my page … tn-450; http://www.lpstraining.it,


Having a sign made in your building is also necessary for your corporation.

Look at my weblog – tn450 (Evie)


Needless to say some persons are skeptic in regards
to the functionality of automatic duplex printing and in case you are considered one of them this can be a handy various.
The reminiscence of this printer is a bit boring: eight MB.
But I personally don’t imagine it’s going to wreck your printing operation.

my web blog – brother tn-450 (Gordon)


Vert Beauty also supplies: on location bridal get together make-up, engagement
picture makeup, and make-up for teenagers.

Orders over R800 get free supply to your door in South Africa.

Review my blog post :: tn-450 (Ronnie)


Enjoyed this hub when it first came out and glad to see it has been awarded Hub of the Day!

Here is my website; brother tn450, Ted,


Only one wheelie bin, hmm?

Also visit my site; brother tn450 toner


When you need to ensure that your prototypes meet your specs, you examine them.

Also visit my webpage … dcp-7065dn toner



My website – tn450 – Bernadette,


An common sized ink cartridge uses round 3.5 oz. of oil to create.

Look at my blog: brother tn450 (Uwe)


Toner refill kits such as the Brother TN-350 toner refill
package are retailed by as a lot as 80% beneath its OEM cartridge counterpart.

Feel free to visit my site brother tn-450 (http://www.etfcoveredcalls.com)


B. Make positive you are paying a good value for any prints over your base.

Also visit my web site; brother tn450 (Jayme)


You might have seen the advert.

Here is my blog post … brother tn420, http://www.vstars.tv/members/profile/3222473/CornellBene,


Thomas Scott invitations you to check out Cipher Electronics.

Here is my page :: brother toner tn450; http://videos.lolfreechampions.com/profile.php?u=JillMccain,


Yes, 3D printers can print human organs.

My blog post :: tn-450 – Linette,


This toner is heated by the printer fuser earlier than being utilized to the
web page by way of an optical drum.

My web-site … brother tn450 toner [Roy]


These cartridges are mostly used by laser printers (Example:
Canon 2617B001AA, Canon 7833A001AA), photocopiers and a few fax machines.While
printing with a toner cartridge, the picture is usually turned into
bitmapped charges of the opposite polarity of the toner, on the drum.

My web-site: brother toner tn450 (Eden)


You will find some options of tangles to use and resources to other sites.
I have also included some accomplished examples, that you are welcome to print
out and shade in.

Here is my webpage :: tn450 toner (Neva)


There are so many potentialities for this concept.

Also visit my homepage; brother hl2270dw toner


You can rest assured that any laser toner cartridge your buy
from Cartridge Save will provide prime quality prints.

Take a look at my webpage – brother tn450 (Jamila)


Multiple customers will be tagged on to a single printer as
it is high capacity. If you want to quickly scan, it takes 2 seconds per page.

It has over 500 pages of fax memory. You can even copy and multi copy.

Here is my web blog; brother tn450 toner (hiddengift.co.kr)


Another disadvantage is normally the superb
of ink.

Feel free to surf to my weblog – brother toner tn450 (Brock)


We work with a European community of service providers to course
of, resell, and recycle returned Ricoh products.

Here is my web blog – tn-450 (Twila)


When the fuser wears on any copier they replace certain parts a few of which are,
the higher heat curler, decrease heat roller, bearings, picker fingers, thermistors,
drive gears and more. The printer industry has a distinct strategy
in that they replace every little thing as an assembly. People are accustomed to this and when they want a replacement fuser they opt for a brand new one many times.
I consider it’s a mind set.

Review my blog post … brother toner (Judson)


So on the premise of these two elements (use of the printer
and the price of using it), I go for buying a monochrome laser printer.

Also visit my blog post: brother tn450 (http://parczoologiquedeparis.info/2016/03/28/essay-to-the-upthrust-necktie/)


It can be smart to shop solely with vendors who can present a superb refund coverage and extended warranty.

Here is my page … tn-450 toner


One of our visitors recently recommended the following website.


Leave a Reply

Your email address will not be published. Required fields are marked *


You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>