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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 can’t directly interact with hardware.

Two types of Virtual Servers are available in market: Software based & Hard ware based. Advantages are more in software based virtual servers. We can modify quota limit in real time without restarting VPS server.

In hardware base virtualization, partitions done in hardware resources. In real environment, you can’t modify quota. It can only be modify with restarting machine. It is much 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. VPS has it’s own operating system. Customers gets full access because VPS runs in it’s own copy of OS. Customer can install any software that run on OS. 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.

Security: Since VPS runs in it’s own environment, you get more security.

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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