Note that I have included tests from some reputable DNS blacklists - these can make a big difference to server load. Barracuda requires you to register your IP address. Note also that I have enabled memcached to avoid a problem with "unable to get exclusive lock" errors in the mail log. Memcache is also useful for caching plugins like W3 Total Cache in WordPress. You can install it with a simple APT command:
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In a shared space, like VPS, it’s hard to imagine how multiple servers operate independently. And yet this is completely possible thanks to virtualization software, known as the hypervisor. This software segments a single physical server into multiple virtual servers and keeps each of them separated from the rest. As a result, you now have access to what is, called a Virtual Machine (VM). Each of these virtual machines runs a complete OS and is restricted to a portion of the physical server. While multiple tenants share VMs on the same server, they are restricted from interacting with each other. This allows for perfect privacy, even with multiple users.


While VPS hosting allows you to choose and configure your operating system and server applications, dedicated hosting goes one step further. It doesn’t only let you configure the software but also the hardware, as the entire server is yours and no one has any say in the setup. You can also run a dedicated server on-site (for instance, in your office), however you lose the support of a professional hosting team in that case.
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The most obvious and popular reason for a VPS is to run a single website, or multiple websites. However, you can use them for pretty much anything that requires access to the internet – such as a web application like Nextcloud to run your own Dropbox alternative – or to create your own virtual private network to better secure the internet connection of your PCs and mobile devices.
Yuriy Gandyak:

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In fact, most webhosts will offer the same LAMP web server stack software on their managed VPS plans as their shared hosting accounts. The main difference is the level of dedicated system resource allocation, such as RAM, CPU cores, bandwidth, or storage options. VPS plans also offer far more configuration options for web server customization with the command line than shared Linux or Windows hosting plans.
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There are numerous open source Linux virtualization platforms based on KVM, while Microsoft has Hyper-V with Windows cloud servers, Citrix maintains the Xen server framework, and VMware has a number of different hypervisor frameworks such as ESXi. Hypervisors permit the managing of multiple web servers independently on shared hardware each with isolated databases, file storage, and I/O request processing.

The most obvious and popular reason for a VPS is to run a single website, or multiple websites. However, you can use them for pretty much anything that requires access to the internet – such as a web application like Nextcloud to run your own Dropbox alternative – or to create your own virtual private network to better secure the internet connection of your PCs and mobile devices.

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