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It allows multiple smaller applications to run at the same time. Full Virtualization Full virtualization is a technique in which a complete installation of one machine is run on another. The result is a system in which all software running on the server is within a virtual machine. Internet Your Company Service Provider In a fully virtualized deployment, the software running on the server is displayed on the clients.
This sort of deployment allows not only unique applications to run, but also different operating systems. That is, the remote datacenter may be delivering your services in a fully virtualized format.
In order for full virtualization to be possible, it was necessary for specific hardware combinations to be used. In full virtualization, the entire system is emulated BIOS, drive, and so on , but in paravirtualization, its management module operates with an operating system that has been adjusted to work in a virtual machine.
Paravirtualization typically runs better than the full virtualization model, simply because in a fully virtualized deployment, all elements must be emulated.
Internet Service Provider Your Company In a paravirtualized deployment, many different operating systems can run simultaneously. For instance, flexibility is reduced because a particular OS or distribution may not be able to work. For example, a new Windows deployment may not be available as a guest OS for the solution. Security can be at risk because the guest OS has more control of the underlying hardware, and there is a risk of impacting the hardware and all the guest systems on the host.
Paravirtualization also allows for better scaling. For example, if a fully virtualized solution requires 10 percent of processor utilization, then five systems are about the most that could be run on a system before performance takes a hit.
Paravirtualization requires only 2 percent of processor utilization per guest instance and still leaves 10 percent of the guest OS available. This is illustrated in Table It is easier to add more processing power or hard drive capacity in a virtualized environment. The idea is that you use the software out of the box as is and do not need to make a lot of changes or require integration to other systems. Application Internet Service provider offering SaaS SaaS provides an application or piece Clients of software from the service provider.
Costs can be sort of a double-edged sword. On the one hand, costs for accessing the software can be an ongoing thing. For vendors, SaaS has the appeal of providing stronger protection of their intellectual property as well as creating a continuous stream of income.
There are many types of software that lend themselves to the SaaS model. Typically, software that performs a simple task without much need to interact with other systems makes them ideal candidates for SaaS. Customers who are not inclined to perform software development but have need of high-powered applications can also benefit from SaaS. This makes them web-native. It was also built with a multitenant back end in mind, which enables multiple customers to use an application.
SaaS provides network-based access to commercially available software. Since the software is managed at a central location, customers can access their applications wherever they have web access.
When used as a component of another application, this is known as a mashup or a plugin. Chapter 1: Cloud Computing Basics 13 Benefits One of the biggest benefits of SaaS is, of course, costing less money than buying the application outright. The service provider can offer cheaper, more reliable applications than organizations can by themselves. As such, the learning curve for using external applications can be much smaller.
The ability to farm out applications reduces the need for as much IT staff. SaaS applications are much easier to customize and can give an organization exactly what they want. However, with SaaS, the entire world is open to the providers. And while that is sporadically true, the fact of the matter is that the Web is generally quite reliable. This allows customers to reach their applications securely without having to employ complex back-end configurations, like virtual private networks VPNs.
This will allow organizations to trust that they can access their applications with low latencies and good speeds. Obstacles Like anything, SaaS faces obstacles to its implementation and use. The first is that an organization that has a very specific computational need might not be able to find the application available through SaaS. In that case, they may discover that they need to buy the software and install it on their local machines.
That said, companies with unique needs may be able to find some of the components in a SaaS. That is, the customer might pay a provider to use an application, but once they do, they may be unable to port that application to a new vendor. Or, it might be possible to move to a new vendor, but the old vendor might charge a hefty moving fee.
Finally, SaaS also faces challenges from the availability of opensource applications and cheaper hardware. If companies are so inclined, they can put their open source applications on hardware that performs better and costs less than it used to. PaaS supplies all the resources required to build applications and services completely from the Internet, without having to download or install software.
Platform Internet Service provider offering PaaS PaaS allows clients to access a computing platform over a cloud computing solution. PaaS services include application design, development, testing, deployment, and hosting.
Other services include team collaboration, web service integration, database integration, security, scalability, storage, state management, and versioning. A downfall to PaaS is a lack of interoperability and portability among providers.
Also, if the provider goes out of business, your applications and your data will be lost. The company started in and by mid was out of business, causing applications and client data they hosted to be lost.
Because PaaS is expected to be used by many users simultaneously, it is designed with that sort of use in mind, and generally provides automatic facilities for concurrency management, scalability, failover, and security.
The interfaces are also able to access databases and reuse services that are within a private network. Often, PaaS developers and users are required to purchase subscriptions to the add-on SaaS application.
They do not include development, debugging, and test capabilities. Because vendors use proprietary services or development languages, some developers are afraid of being locked into a single provider. The vendor may allow the application to be brought to a different provider; however, the costs are typically higher as compared to moving applications between conventional hosts.
Hardware as a Service Hardware as a Service HaaS is the next form of service available in cloud computing. It simply offers the hardware so that your organization can put whatever they want onto it. Rather than purchase servers, software, racks, and having to pay for the datacenter space for them, the service provider rents those resources. Further, multiple tenants can be on the equipment at the same time. Resources are typically billed based on a utility computing basis, so providers charge by how many resources are consumed.
Service providers often have this set up as a grid for easier scalability. Applications So now we get to the question—what does cloud computing actually do? Well, we have applications running on our laptops, servers, phones and the like. Cloud computing either has them too or has the potential to bring them to you.
So cloud computing brings you applications, a way of viewing, manipulating, and sharing data. The most common are storage and database. Storage Somewhat similar to HaaS, one of the uses for cloud computing is simply storage. But there are different options when it comes down to cloud storage. PART I Database Databases which we will talk more about later in this chapter are repositories for information with links within the information that help make the data searchable.
But to the client, the information seems to be located in one place. For instance, if you have a spreadsheet on your computer and then upload it to the storage service, the next time you check your PDA, that file will be downloaded onto it. The idea behind DaaS is to avoid the complexity and cost of running your own database. Depending on your vendor, you can get custom data validation to ensure accurate information.
You can create and manage the database with ease. For instance, you can tie it in with calendars, email, and people to make your work more powerful. With some DaaS offerings, this management can be provided as part of the service for much less expense.
The provider will often use offshore labor pools to take advantage of lower labor costs there. It is expected to be in a public beta by spring It is also able to start small and scale larger as needed. While it looks similar to SimpleDB, it varies greatly. NET library for synchronizing dissimilar data sources.
Microsoft wants SSDS to work as a data hub, synchronizing data on multiple devices so they can be accessed offline. Microsoft built it with large-scale deployment in mind. Chapter 1: Cloud Computing Basics 19 SSDS is a bit of a twist because it backsteps from being more complex, rather being simple and flexible.
Cloud-based backups offer reliability and virtually unlimited capacity, available on demand and with no up-front capital expenditure. The Oracle Secure Backup Cloud Module also enables encrypted data backups to help ensure complete privacy in the cloud environment. For customers with an ongoing need to quickly move very large volumes of data into or out of the AWS cloud, Amazon allows the creation of network peering connections.
Intranets and the Cloud While your operation is not big as Amazon S3 cloud computing, you can use the same sorts of principles within your organization to develop your IT infrastructure.
By setting up thin clients to run applications and services on a local server, rather than on their desktops, you ease the costs of deployment and maintenance, as well as reducing power costs. Intranets are customarily used within an organization and are not accessible publicly. That is, a web server is maintained in-house and company information is maintained on it that others within the organization can access.
However, now intranets are being maintained on the cloud. The network map in Figure shows how they are deployed. The servers house the applications your organization needs to run, and the thin clients—which do not have hard drives—display the results.
These sorts of solutions provide the tools to supply a virtualized set of hardware to the guest operating system. They also make it possible to install different operating systems on the same machine. For example, you may need Windows Vista to run one application, while another application requires Linux. Chapter 1: Cloud Computing Basics 21 Thin clients use an application program to communicate with an application server.
Most of the processing is done down on the server, and sent back to the client. There is some debate about where to draw the line when talking about thin clients. PART I Some thin clients require an application program or a web browser to communicate with the server. However, others require no add-on applications at all. This is sort of a discussion of semantics, because the real issue is whether the work is being done on the server and transmitted back to the thin client.
First Movers in the Cloud There are scores of vendors who offer cloud services. What they have to offer varies based on the vendor and their pricing models are different, as well. Cloud computing is a growing field, and there will likely be new players in the market in the foreseeable future. Amazon Amazon was one of the first companies to offer cloud services to the public, and they are very sophisticated. These services can be difficult to use, because they have to be done through the command line.
In fact, applications can be written on your own machine and then uploaded to the cloud. Amazon is the most extensive cloud service to date. Google offers online documents and spreadsheets, and encourages developers to build features for those and other online software, using its Google App Engine. Google reduced the web applications to a core set of features, and built a good framework for delivering them. Google also offers handy debugging features. Groups and individuals will likely get the most out of App Engine by writing a layer of Python that sits between the user and the database.
Look for Google to add more features to add background processing services. It can be found online at code. NET Services Provides service-based implementations of. NET Framework concepts such as workflow. Microsoft plans the next version of Office to offer a browser-based option so that users can read and edit documents online as well as offer the ability for users to collaborate using web, mobile, and client versions of Office. But for others who want to embrace it, cloud computing is a great way for IT professionals to focus less on their datacenters, and more on the work of information technology.
Just as the hardware and software configuration you use in your organization is different from that of the company down the street, your cloud computing needs will be different as well.
This chapter will help you understand how your organization can best use cloud computing, and which solutions might be most appropriate for your needs. And while we talk about what cloud computing is good for, we also talk about cloud computing limitations. But there may also be times when cloud computing is simply not a good match for your needs. Scenarios There are three different major implementations of cloud computing.
How organizations are using cloud computing is quite different at a granular level, but the uses generally fall into one of these three solutions. You could close this book right now, sign up for a cloud computing account, and get started right away. Cloud Storage One of the first cloud offerings was cloud storage and it remains a popular solution. Cloud storage is a big world. There are already in excess of vendors offering cloud storage. This is an ideal solution if you want to maintain files off-site.
Security and cost are the top issues in this field and vary greatly, depending on the vendor you choose. PART I Cloud Applications Cloud applications differ from compute clouds in that they utilize software applications that rely on cloud infrastructure. Cloud applications are versions of Software as a Service SaaS and include such things as web applications that are delivered to users via a browser or application like Microsoft Online Services. These applications offload hosting and IT management to the cloud.
Cloud applications deliver applications that depend on the infrastructure of the Internet itself. The fact of the matter is there are plenty of cases where cloud computing may not be appropriate, for any reason ranging from cost to hardware requirements to simply not needing it.
Even so, Google and Microsoft are both moving forward on health records services: Microsoft is working on its HealthVault and Google Health promises to be a huge outpouring of private health data online.
While the intent seems well-meaning—to give consumers access to their healthcare data—all it takes is one tiny breach to let sensitive data loose. If you have data that is regulated—like HIPAA or Sarbanes-Oxley—you are well advised to be very careful in your plans to place data on a cloud. Oh, and just to add some teeth to what can happen if private data gets out, consider Table Table illustrates potential penalties if the laws are violated.
Legislative Issues An issue of more concern for the sensitivity of private data is that there are laws and policy that allow the government freer access to data on a cloud than on a private server. Geopolitical Concerns It may simply be illegal to post your information on a cloud. The Canadian government has declared that government IT workers may not use network services that are operating within U. The reason is that the Canadian data stored on those servers could be negatively impacted based on the Patriot Act.
Sure, Canada might be the friendly neighbor of the United States to the north, but at this point in time, they have a great policy. All it would take is for the U. And the same can be said of clouds operating outside the United States. Chapter 2: Your Organization and Cloud Computing 27 Hardware Dependencies If you have an application that requires specific hardware, chips, or drivers, a cloud solution might not be a good fit for you.
First, if you have special hardware needs, the chances are lower that the service provider will have the precise hardware you need. That can significantly narrow your options when it comes to shopping around and finding a good deal. This is all blissful now, but if the provider ever changes chipsets or other critical hardware, you might be out of luck.
Server Control If your application demands complete control over everything that is running, a cloud solution may not be right for you. After all, these are all things managed by the service provider. NOTE In some clouds, you are not even allowed root access. If you require advanced levels of access, make sure you understand what your prospective provider will allow. Cost One of the big draws of cloud computing is cost. That is, it tends to be less expensive to run an application on a cloud than to invest in the infrastructure, buy the application outright, and then manage it day to day.
However, over time, it may cost more to pay the cloud subscription than to have simply bought the servers yourself, so it is important to factor in everything from facilities, staff, software, and hardware. Cost and the way clouds operate are a moving target. Another school of thought is a concept called cloud bursting. In this scenario, on-demand capacity can be provisioned to a cloud.
If your current solution is getting the job done, why tinker with it? And in those cases, by all means use it. Integration with Existing Applications If you mix oil and water, you get a lava lamp. It creates problems with security, speed, and reliability. For instance, if you have two databases—one with sensitive data housed locally, and one with nonsensitive data on a cloud—the chances that the sensitive data will find its way to the cloud are very good. Also, if you are trying to run a high-speed application in-house and you rely on data from the cloud, the application will only run as fast as the cloud will allow.
This also leads to questionable reliability. Will data be compromised or damaged from all the flying around it has to do? Latency Concerns Since your data and application are located on a series of servers geographically disparate from your own site, it is going to take some time for the data to reach you.
But if you require data instantaneously, the cloud might not be your best option. Internet Your users Latency can cause problems when using a cloud vendor. Now, it might be the case that a worker can request given data and it comes through in less than a second, and that speed is fine. However, if that same worker needs the data faster than a second, it might not be coming PART I through fast enough. Throughput Demands Since cloud computing is generally billed in a utility format, you pay for what you use.
For instance, if you are streaming high-definition video over sources, your costs are going to spike sharply. Take into account what a server, power, and all other hardware will cost. Figure in the price of management and associated IT personnel costs and then compare that with what a service provider will charge you. But even if the cost is the same, you need to ask yourself what business you want to be in. Benefits Your organization is going to have different needs from the company next door.
However, cloud computing can help you with your IT needs. Rather than having to buy, install, and configure new equipment, you can buy additional CPU cycles or storage from a third party. Internet Your users As you require more capacity, the service provider can make scalability much simpler than if you had to add the equipment on your own premises.
Simplicity Again, not having to buy and configure new equipment allows you and your IT staff to get right to your business. The cloud solution makes it possible to get your application started immediately, and it costs a fraction of what it would cost to implement an on-site solution.
Knowledgeable Vendors Typically, when new technology becomes popular, there are plenty of vendors who pop up to offer their version of that technology. By contrast, the first comers to the cloud computing party are actually very reputable companies. Chapter 2: Your Organization and Cloud Computing 31 More Internal Resources By shifting your non-mission-critical data needs to a third party, your IT department is freed up to work on important, business-related tasks.
Also, since network outages are a nightmare for the IT staff, this burden is offloaded onto the service provider. True, outages happen, but let Amazon worry about getting the service back online. Security There are plenty of security risks when using a cloud vendor, but reputable companies strive to keep you safe and secure.
Vendors have strict privacy policies and employ stringent security measures, like proven cryptographic methods to authenticate users. Limitations There are other cases when cloud computing is not the best solution for your computing needs. This section looks at why certain applications are not the best to be deployed on the cloud.
However, Google may absolve itself of responsibility in its agreement with you. Also, the door is wide open for government investigators to subpoena that information. It has become much easier for the government to get information from third parties than from a privately owned server.
And other providers may, by way of their agreement with you, be allowed to access and catalog your information and use it in ways you never intended. Again, be absolutely certain you understand fully your agreement with any service provider and that you approve and accept the terms of the agreement. Private data has certainly been released. In , AOL released search terms of , users to researchers on a public web page.
In , Microsoft and Yahoo! Department of Justice as part of a child pornography case. Obviously, no one wants predators to get away with their crimes, but consider the implication if your data was innocently mixed in with the data that Yahoo! And in the media we regularly hear about retailers and others losing credit card numbers. In , the British government even misplaced 25 million taxpayer records.
The point is, if you have sensitive or proprietary data, the cloud might not be the safest place for it. The best way is to encrypt your data before you send it to a third party. Programs like PGP www. Encrypting your data before sending it out protects it. If someone does get your data, they need the proper credentials or all they get is gibberish.
Chapter 2: Your Organization and Cloud Computing 33 Of course, that just applies to data you manipulate in-house and then send to the cloud. If you use word-processing files or spreadsheets that are edited online rather than just stored on the Web, then the data, when saved to the cloud, may not be encrypted. Those are most likely to rummage through your data looking to assemble user profiles that can be used for marketing or other purposes.
No company can provide you with free tangible goods or services and stay in business for long. They have to make money somehow, right? When in doubt, always keep your data where you can be most certain it is secure, even if that means keeping it in your own server room until you can develop an alternate solution you know you can trust. Applications Not Ready In some cases the applications themselves are not ready to be used on the cloud.
They may have little quirks that prevent them from being used to their fullest abilities, or they may not work whatsoever. First, the application might require a lot of bandwidth to communicate with users. Remember, since cloud computing is paid based on how much you use, it might turn out to be less expensive in the long run to simply house the application locally until it can be rewritten or otherwise modified to operate more efficiently.
The application might also take a lot of effort to integrate with your other applications. If you try to relocate it to a cloud, you may find that the savings are erased by the additional effort required to maintain the integration. In this case it may end up being more cost- effective to continue to host it locally. If the application has to talk with a database that you have onsite, it may be better to also have the application hosted locally until you can move the entire infrastructure to the cloud.
Again, this helps you avoid the service cost of having to transfer to and from the cloud. Some applications may not be able to communicate securely across the Internet.
If they cannot communicate securely or through a tunnel, then your data is at risk. In the event the application cannot communicate securely, you will need to host it locally where you can have other means of security to protect data as it is transported across networks. Also, since you are displaying the application results on an interface like a web browser, you need to ensure that your application is compatible with a variety of browsers and will operate properly using encryption, like SSL, for some or all of the interaction your user has within the application.
If you are relying on applications to be available on the cloud, that may or may not be the case. It depends on whether the developer has created a cloud-friendly version of the application you want. In the event that your application is not ready, you might be out of luck. It is still possible to write your own application. However, it may be the case that you need a very specific application.
This is sort of a minor concern, because chances are good that you have programmers on staff who can pound out what you need in no time. Failing that, you can always hire a firm or a programmer to do it for you. But There Are Benefits The fact of the matter is that putting your database needs on a cloud can be very beneficial, in terms of scalability.
At some point, your servers are going to have issues if there are too many users trying to access them, and the inherent scalability of cloud-based resources can mitigate that risk. It is often said that this generation of web services got its start from LAMP.
LAMP is a stack of simple, powerful web technologies that power a lot of popular, smaller web sites. Because of its ease of use, you can get an application up and running very quickly.
The first problem is one of scalability. Scalability issues come from the number of threads and socket connections in the Apache web server. If the server is not properly tuned and a load increases, it can cause problems. A larger scalability problem comes from MySQL. Relational databases have a hard time growing beyond a certain capacity due to the way they represent information.
When you reach that limit, database management becomes more difficult. Chapter 2: Your Organization and Cloud Computing 35 You can work around this through a procedure called data partitioning.
Using this method, you split your data into independent sets, and you can scale indefinitely. This is beneficial because the cloud allows you to scale indefinitely; it just means that more servers need to be added. Essentially, you can scale from 1, users to 1,, by just adding more servers.
Security Concerns As with so many other technical choices, security is a two-sided coin in the world of cloud computing—there are pros and there are cons. IDC conducted a survey of IT executives about cloud services. As Figure shows, security led the pack of cloud concerns with In order to be successful, vendors will have to take data like this into consideration as they offer up their clouds.
Privacy Concerns with a Third Party The first and most obvious concern is for privacy considerations. As a starting point, assume that anything you put on the cloud can be accessed by anyone. But in reality, even if providers are doing their best to secure data, it can still be hacked, and then your sensitive information is at the mercy of whoever broke in. The best plan of attack is to not perform mission-critical work or work that is highly sensitive on a cloud platform without extensive security controls managed by your organization.
Before signing on with a reputable vendor, keep in mind, also, that they are doing all they can to protect your data. Now, there is a school of thought that says, in fact, that vendors will be going above and beyond to ensure that your data is secure. This is a simple matter of doing business. There are a lot of ways that their cloud and your data can be compromised. They want something. It ranges from selling your proprietary information to your competition to surreptitiously encrypting your storage until you pay them off.
Or they may just erase everything to damage your business and justify the action based on their ideological beliefs. It can and does happen. Either way, hackers are a real concern for your data managed on a cloud. Bot Attackers In a commonly recognized worst-case scenario, attackers use botnets to perform distributed denial of service DDOS attacks. In order to get the hackers to stop attacking your network, you face blackmail. Hackers set up systems to send out distributed denial of service attacks, bringing the service provider to its knees.
One major Tokyo firm had to pay 3 million yen about U. Because the attack was so dispersed, police have been unable to track down the attackers. In the world of cloud computing, this is clearly a huge concern.
If your data is on the cloud being attacked, who will the ransomers come to for money? Will it be you? Will it be the vendor? And will the ransom even be paid? Security Benefits This is not to suggest that your data is unsecure on the cloud. Providers do endeavor to ensure security. Otherwise, word of mouth and repeat business will shrivel up. But the very nature of the cloud lends it to needing some very strong security practices. However, there are some good security traits that come with centralizing your data.
Just in practice, you make your system more inherently secure. Also, how many laptops employ really strong security measures, like whole-disk data encryption? If the laptop can be effectively compromised, the information will be in the hands of the thief. By maintaining data on the cloud, employing strong access control, and limiting employee downloading to only what they need to perform a task, cloud computing can limit the amount of information that could potentially be lost.
Monitoring If your data is maintained on a cloud, it is easier to monitor security than have to worry about the security of numerous servers and clients. Of course, the chance that the cloud would be breached puts all the data at risk, but if you are mindful of security and keep up on it, you only have to worry about one location, rather than several. Instant Swapover If your data is compromised, while you are conducting your investigation to find the culprits, you can instantly move your data to another machine.
Abstracting the hardware allows you to do it instantly. Logging In the cloud, logging is improved. Logging is usually thought of late in the game, and issues develop with storage space. Also, you can use more advanced logging techniques. For instance, a C2 audit trail can be employed. This is generally rarely used because of the performance hit your network would take. However, in the cloud, you can reach that level of granularity.
Secure Builds When you developed your own network, you had to buy third-party security software to get the level of protection you want. With a cloud solution, those tools can be bundled in and available to you and you can develop your system with whatever level of security you desire. Also, you can perform your patches and upgrades offline. As you patch a server image, you can keep it safe offline, and when you are ready to put the virtual machine online, you can conveniently do that.
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