Lightweight, fast and reliable - these are the core tenets of CentOS. It is one of the best Enterprise-level operating systems that aims for speed and stability, without cutting out security. Inspired by Red Hat Enterprise Linux, CentOS is also a formidable option for VPS hosting. When in doubt, pick the go-to web server operating system around the world. Power, robustness, and flexibility guaranteed!

Managed VPS plans offer a managed environment similar to our shared hosting accounts, but with increased resource availability. If you are outgrowing a shared hosting environment, but are not ready yet to make the leap to a dedicated server, you should consider a managed VPS. This plan is also a good option if you need certain customizations that are not provided with shared hosting plans, but you would still like A2 Hosting to handle configuration changes, software upgrades, and other system administration tasks.

So that could be either a virtual machine - an operating system running inside another operating system, or a virtual private server - you rent a virtual server from a company, so you have your own internet-facing server running 24/7 relatively cheap (since it's not a real server, but one of many virtual server running on an actual server). I think he might have meant the later, since you'd have to run a snartnofe (btw I love that name) non stop to benefit from it.
Change is a good thing. Unfortunately, when you are making big changes to your site or application, there is always room for error. Live-state snapshots takes the idea of a "backup" and brings it forward to its next logical step. Taking a snapshot of your partition not only creates a backup of your files, but also all of the processes running in the background at that instant in time. This way, if you make an error or break something while making updates, you can revert your partition to that exact snapshot, providing a working, fail-safe rollback.
Perhaps the best way to approach the virtual server is the idea of a virtual machine. A VM allows you to run an emulation of a computer within your computer, drawing on the resources of the physical one –  disk space, RAM, CPU, etc. This tactic allows you to run an entirely separate operating system (OS) solely for the purposes of the VM, even if its type and version of OS are identical to what’s on your hardware.

In this case, providers do not offer any help in case any problems are encountered with unmanaged VPS accounts. The customers should, therefore, have a thorough knowledge of Linux operating system and understand the ways to control the VPS so as to ensure uptime, reliability, and server stability. There may be problems related to resources, software, performance, or configuration- all of them have to be handled by the clients themselves. The web host will only look into problems related to network or hardware in case of unmanaged hosting.
Launch Assist™ includes 2 hours of dedicated time with one of our T3 System Administrators and can be used upon purchase for a number of different practical applications, including site migrations, server security setup, email servers, application installation, CRON automation, hardware configurations and much more. For a limited time, all VPS Hosting customers receive Launch Assist™ as a part of their purchase.
But if you require a lot of computing power and maximum control VPS hosting is only second to a dedicated server. Intensive websites, web apps, online game servers, databases and other kinds of complex projects are perfect for a VPS hosting service. VPS hosting provides more control than any other service, as you can install your preferred OS and take advantage of root access.
If you’re searching for the flexibility of a dedicated server without the expensive drawbacks, VPS hosting may be the right solution for you and your business. At JaguarPC, we utilize state-of-the-art software and hardware, and offer VPS service plans to Windows and Linux users. With over 20 years of industry experience behind us, you can feel confident in our company’s ability to improve your business’s productivity via dependable products and support.
You can create a VPC where instances in one subnet, such as web servers, communicate with the Internet while instances in another subnet, such as application servers, communicate with databases on your corporate network. An IPsec VPN connection between your VPC and your corporate network helps secure all communication between the application servers in the cloud and databases in your data center. Web servers and application servers in your VPC can leverage Amazon EC2 elasticity and Auto Scaling features to grow and shrink as needed. You can create a VPC to support this use case by selecting "VPC with Public and Private Subnets and Hardware VPN Access" in the Amazon VPC console wizard.
Unlike managed VPS plans, unmanaged VPS plans are not actively managed by A2 Hosting. Unmanaged VPS plans are for more advanced users who are comfortable using the command-line interface and doing system administration tasks. These plans include root account access so you can customize the server as much as necessary. As a result, you are responsible for the following items:
Should you need more speed and performance you can also consider switching to an ssd-powered VPS package which has the same advantages as a VPS but offers faster performance due to the presence of SSD hard drives. VPS SSD is highly recommended for websites that use a lot of disk caching, for example WordPress websites with the w3 Total Cache plugin
There is a good chance that your company or the clients you are hosting will want to create their own custom nameservers for their properties, opting to use ns.yourdomainhere.com over a host-specific nameserver. Updating nameservers for domains is very simple within our Account Management Panel (AMP). If your domain is currently with another host/registrar, you also have the option of pointing the nameservers to ns1.inmotionhosting.com without transferring the domain to InMotion Hosting. Creating custom nameservers requires root access, which is available by request for all VPS Hosting plans.
With unmanaged cloud VPS hosting, the hosting provider is only responsible for the physical server and the availability of the server.  This means that with the exception of the initial OS installation, the user is responsible for the maintenance, upgrades, installation of software, etc.  If you choose unmanaged cloud VPS hosting, you should be familiar with the operating system and server software you choose to use.
You can use Amazon VPC to host multi-tier web applications and strictly enforce access and security restrictions between your webservers, application servers, and databases. You can launch webservers in a publicly accessible subnet and application servers and databases in non-publically accessible subnets. The application servers and databases can’t be directly accessed from the Internet, but they can still access the Internet via a NAT gateway to download patches, for example. You can control access between the servers and subnets using inbound and outbound packet filtering provided by network access control lists and security groups. To create a VPC that supports this use case, you can select "VPC with Public and Private Subnets" in the Amazon VPC console wizard.
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