Server Virtualisation is a technique where one physical server is partitioned into several small virtual servers running their operating systems.
These operating systems are known as guest operating systems. These operating systems are installed on another operating system known as the host operating system. Each guest operating system is unaware of other guest operating systems. Different virtualization techniques are applied to achieve this transparency between guest operating systems.
1. Full virtualization
Full virtualization makes use of a hypervisor. A hypervisor is software that sits between the hardware and operating systems. It directly talks with the physical server's storage and CPU.
It is the duty of the hypervisor to monitor the resources used by the physical server. It also relays resources from the physical server to the correct virtual server. Another critical function of a hypervisor is to keep each virtual server in dark of the operations of other virtual servers. The host operating system also runs on the hypervisor to administer the virtual machines.
But no solution is perfect. And the flaw of a hypervisor is that it needs its processing resources. This resource requirement impacts the speed and performance of servers and apps on it.
In this type of virtualization, the guest OS is modified before its installation on VM. The hypervisor works with modified OS for interrupt handling, timekeeping, and memory management.
This allows the guest OS can communicate with the hypervisor. This reduces the entire execution time to complete the operations.
3. OS Level Virtualisation
In this type of virtualization, the kernel allows the existence of various isolated user-space instances. This virtualization software is installed on the host operating systems level. Virtualization can operate and generate multiple virtual machines.
Types of Website Hosting
When it comes to website hosting, there are many options. We need to choose the hosting which is best suited for our business. The selection criteria depend upon the type of website, expected traffic, and of course, budget. Let us study different types of hosting in comparison with VPS.
1. Shared Hosting
2. Dedicated Hosting
3. Cloud Hosting
4. WordPress Hosting
5. VPS Hosting
The hosting provider will readily configure Shared Hosting services. So, the user can hardly customize. In this hosting, the account owner has to share CPU, disk space, memory, etc., with other users using the shared hosting.
The analogy can be like this. In a big house, there are numerous rooms. Each room is given to a website owner. Each owner shares a common kitchen, living area, etc., with other website owners.
Shared hosting is suitable for
· Blogs and personal sites
· Small and average size companies with medium traffic
· Low budget companies
Advantages of Shared Hosting
· Requires minimal or nil technical knowledge
· Low cost
· Ready to use and beginner-friendly
Disadvantages of Shared Hosting
· Less bandwidth
· less security
· No root access hence less customizable
One entire physical server will be dedicated to one account. Because of this isolation and single account, the server will be fast and secured. Also, since the user has complete control over the server, the scheme is highly flexible and customizable. This type of hosting is suitable for large websites with heavy traffic. Small and Medium websites usually do not need such resources.
The price of dedicated hosting will be higher than the other types of hosting as you get dedicated resources here to get similar functionality. For a lesser price, one can choose VPS.
Dedicated Hosting Is Good For
· Medium or Large size companies with 500+ employees
· Information Technology business
· Web Hosting Resellers
Advantages of Dedicated Hosting
· Safe and Secure
Disadvantages of Dedicated Hosting
· Technically Advanced
The resources are deployed on a network of virtual and physical servers. When one server is busy, the cluster redirects the users' requests to other servers. As a result, there is no downtime. This gives greater flexibility.
Cloud Hosting has a similar set-up as VPS hosting. The difference being a VPS is hosted on one single physical server, whereas a Cloud hosting server is virtually partitioned on multiple physical servers. This makes cloud server hosting more scalable and available than VPS.
Advantages of Cloud Hosting
· Beginner Friendly
· Easy Maintenance
· Reliable and Scalable
Disadvantages of Cloud Hosting
· Lack Of Scalability
This hosting is available for users having WordPress sites. This Hosting service comes with other WordPress-related features. It is a type of shared hosting.
However, it is possible to set up a WordPress website on VPS. The user needs to take care of installing WordPress on VPS. The users' responsibility is setting up the website and other configurations. In this case, the user must have some technical knowledge.
Advantages of WordPress Hosting
· High on performance
· Dedicated support by the WordPress Hosting company
· Security and Backup
Disadvantages of WordPress Hosting
· We need a lot of plugins for additional features
· Frequent theme and plugin updates
· Slow Page Speed
VPS hosting bridges the gap between dedicated and shared hosting. It provides an environment of dedicated hosting within a shared server. It is more cost-effective than dedicated hosting with better reliability, security, and performance.
Depending on the usage of the VPS Hosting service, it can be divided into two types.
Managed VPS Hosting and Unmanaged VPS Hosting
A web hosting provider manages all the server-related issues in the VPS hosting service. The user is not required to have technical knowledge about VPS. Without worrying about the underlying technology, users can focus on their business.
In Unmanaged VPS Hosting Service, managing, updating, and other severer related things must be managed by the user. The Hosting provider only takes care of the physical server. The user must take care of the operating system, server updating, and other hardware and s/w-related things.
This requires the user to have technical exposure and adequate knowledge about VPS. More prominent organizations that use unmanaged VPS Hosting will have a dedicated team to look after and manage the VPS server.
Unmanaged VPS Hosting is better if you have already established a business. For starters, it is always better to go with managed VPS Hosting to concentrate on your business without worrying about technology.
Advantages of VPS Hosting
· Faster and Reliable than shared Hosting.
· Since you own your server, there is no problem with traffic surging
· Due to root access, your server becomes highly configurable
· More security for data
· Easy to scale. You can upgrade your server's memory and CPU bandwidth when required.
Disadvantages of VPS Hosting
· Prices are higher compared to Shared Hosting
· It needs some technical knowledge compared to other types of hosting
· Incorrectly configured servers may lead to problems.