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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 images runs virutal servers. It doesn’t have any ability to interact with hardware.
Basically there are two kinds of virtual server. One is software based & other is hardware based. Advantages are more in software based virtual servers. We can increase quota incrementing and decrementing in real time without restarting node.
In hardware base virtualization, partitions done in hardware resources. You can not modify allocated quote in real time. It can only be modify with restarting machine. Security is more in it. 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 run on its own copy of operating system. Users gets higher level of access because VPS runs in it’s own environment. IT gives better flexibility to install any software. Some software can not run on virtual environment like firewall and antivirus client. 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 the website testing or updating needed, it can be easily done without down time.
Advantages:
Root Access: You get root access with VPS hosting. You get root access to you can install any thing you want.
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: You get more security with 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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