Choosing the type of VPS

Basically, there is 2 type of VPS whether it is a VM, virtual machine or a VPS, they are virtualized. But if you are examing carefully, they could be different. The VPS is either virtualized by OpenVZ or the commercial licensed Virtuozzo, or Hypervisor like KVM. OpenVZ and Virtuozzo are the same types of virtualization. They are known as OS level virtualization while Hypervisor like KVM is a hardware level virtualization. In terms of usage, they are little differences but there are some restriction on an OS level virtualized environment as well as a con in like KVM full virtualization.

Let us begin,  the OpenVZ virtualization is like sharing CPU, memory and disk space dynamically. Although you are still catered to the resources you have purchased. Another word, you might use more if the server allowed but on other hands, you can be slower if your server has a lot of guest machines.  Many circumstances, an OS or a control panel files are shared using the template system. This is an advantage to the hoster, as this has greatly reduced the disk space used. And it has helped to speed up the deployment process if they are universal. You are not likely to customize it

OpenVZ uses host kernel. It’s not possible to install applications require kernel existence like Anti-Virus or Backup agent etc. However, the guest machines create instructions and make a call to the hardware directly, thus the overhead is lower and it is faster. Kernel updates might be an issue to address OS vulnerability if you do not use 3rd party solution like Kenerlcare on the host server. To take effect the changes, a reboot is required.

I prefer Hypervisor like KVM for these reasons; In a KVM guest OS is independent so the kernel. You can have a mix of OS guest machines not limited to the kind of OS installed on the host server. You can install any application, there is no such restriction like an OpenVZ VPS. No doubt KVM Full virtualization has higher overhead as their hardware is emulated and virtualization, however, these years there are improvements like ballooning and paravirtualization has improved a KVM guest machines.

If you are looking for better isolation and security. A hypervisor will do better in this area. This is one of the major reason why Vastspace has chosen KVM for our VPS plans.

Why is Shared hosting cheaper?

Have you wonder and asked yourselves in web hosting, why a shared hosting is cheaper? Many customers have thought they are the same. Basically, I need a website and a few email accounts. Well, you are not wrong. But a shared hosting vs a VPS there is differences. These reasons that I’m highlighting might affect you and your organization. So, it is good to read and to find out the differences.

Shared hosting or a VPS are still sharing a server. However, the shared methods are different. You put all the users into a server, they share mail service, web server, database server, Despite you can still restrict resources like memory to the budget buyers and hosting a website using an IP address. Actually, you are using the same IP address as the rest in the server. What’s wrong? That’s nothing wrong until someone email account is compromised and send spam emails. Ok, he is sending spam email, it has nothing to with me. Here comes the problem. Email servers have this basic anti-spam thingy known as RBL. RBLs are maintained by different agencies. The popular one like Spamhaus, SpamCop, Barracuda etc.  These RBLs maintain a list of spammer through their system that detects spammer almost in real-time. So, if your email server IP is in the blacklist. Your recipient email will be rejected by their mail server. So, you are too affected because the RBLs blocked emails from your email servers IP address. Right, assign a dedicated IP will solve this problem. Yes, if the price has remained competitive. If the total price is the same as the entry VPS, it will not make sense. This is why;

VPS has allocated CPU units and RAM, unlike Shared Hosting. Even you said yes, my shared hosting plan has RAM. Yes, you are not wrong but it made a difference. Restricted and allocated has a different meaning here. Shared Hosting can use that amount of RAM but VPS is guaranteed which is the minimum memory you can consume. If there is memory available but not allocated you, in some virtualization you are allowed to burst and use more than what you have been allocated.

VPS is independent and unique, has its own operating and services. Others have difficulty with their web server for example. it will not affect you like the shared Hosting. Basically, those important services like web, email, database etc are isolated from one to another. Those reasons, you can accommodate more users in  Shared Hosting solutions whereas VPS has a lower density in this area. Thus, Shared Hosting is cheaper for those reasons. Not forgetting, the control panel is shared by many in a shared server. It’s cheaper in control panel license as it is shared, whereas VPS control panel is per instance basis.

When you will need a VPS?

Many have asked the question, do I need a VPS? If you found yourselves in these situations, very likely you will need a VPS, a KVM VPS in specific.

  • I want to update my server OS kernel and reboot based on my schedule.
  • I do not want to share my services. I can restart if they are dead.
  • I want better isolation/ privacy. I do not wish to share my web content in the same environment.
  • I need one or more dedicated IP.
  • I need to root SSH to my server.