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Virtual Private server

Overview:

We boot physical server normally. Then physical server run a program which boot each virtual server in a virtualization environment. It is very similar to emulator. Disk image boot virtual server. It doesn’t have any ability to interact with hardware.

There are two type of virtual server: One is software base and other is hardware base. Advantages are more in software based virtual servers. Quota limit can be change without rebooting VPS server.

Partitions are done in hardware resources for hardware based virtualization. Real time quota modification can not be done. You can change it only by restarting the server. It is more secure. Security depend on correctness of large and more complicated trusted computing base. It is generally used for commercial purpose. Most commonly used Microsoft Virtual server and VMware ESX Server.

Uses:

Virtual Private server is better than shared web hosting and cheaper than dedicated web hosting. Virtual Private Server runs on it’s copy of OS. Customer gets full access because basically she runs in own copy of OS. You can install any software that run on operating system. You can’t run all softwares in virtual environment, some s/ws might not run in VPS. Many client running on VPS has limited processing time, disk space and RAM. You can host more than one VPS in one physical system. So when you need to test or update web site, you can do it without down time.

Advantages:

Root Access: You get root access with VPS hosting. Any thing can be done with the given root access.

Unlimited Websites: Virtual Private server allow you to host and maintain unlimited websites easily and with less complication

More Services: SSH server is available with VPS. You might not get SSH access with shared hosting.

Increased Security: Chances of hacking is very less in VPS hosting.

Disadvantages:

More responsibility: You have more responsibility of software installation, site maintenance, site security and security updates

Shared Hardware: Due to data log jam you may not have all the access of ram.

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