Ubuntu is one of the most popular desktop Linux distributions which also has a web server variant as well as the Kubuntu package. Overall, Ubuntu, Debian, and Red Hat Enterprise Linux (RHEL) are commonly found in web hosting and private cloud data centers in use as web servers, with Fedora and openSUSE more popular among independent web developers and PHP/Python programmers.
For outgoing mail, this automatic presentation of the correct certificate doesn't work because Postfix doesn't support it. Instead, we have to sign the Postfix certificate with one certificate that contains every domain on the server that is used for autoconfigured outgoing mail (the LetsEncrypt limit is 100 domains). This means that the main domain in Virtualmin (the parent of the server hostname that we already used to sign the server certificate, let's call it myserver.com) must be configured at Virtualmin > Server Configuration > Website Options with "Default website for IP address?" set to "Yes" and for all other domains the setting "Website matches all sub-domains?" must be set to "No".

Operating System virtualization refers primarily to Type-2 hypervisors like KVM or platforms like OpenVZ & Virtuozzo that share the Linux kernel (+ drivers) between partitions on the same web server hardware. This form of VPS is common in managed cloud plans where the web hosting company provides a custom web server stack software such as LAMP/LEMP pre-installed on a VM partition. Multiple customers can share a single dedicated or rackmount server with better security, file isolation, database, and programming language extension support than shared hosting provides, as well as having access to a higher level of web server resources when processing scripts like PHP, Python, or Node.js code. Some forms of OS virtualization will also permit Windows, Linux, & BSD to be installed on the same physical hardware.
When you create a website, you have to pay a company to host it on their server. This is a powerful computer that allows anyone on the internet to connect and access your site. The lowest level of server is a shared hosting plan where hundreds of websites (and all their data) are stored on one server with all of the server’s resources up for grabs depending on who needs them.
Think of a shared server as a large apartment complex, and all of the individual apartments are rented by other website owners. All of you need a place to live — just like your website’s files — but going out to buy a huge family home would be too expensive for your needs. Sharing common areas and utilities in an apartment block helps keep costs down. And the same is true for shared hosting.
Keep firmly in your mind the sort of assets that you require to serve your site(s) when seeking a host. Cost in a VPS is important, but not as key as you might think. VPS resource availability is scalable, so the cost that needs to be looked at is comparable cost from one host to the next. Also – as cPanel revised their pricing model recently, web hosting companies across the board will have to pass those costs on to users sooner or later. You will need to consider the cost of control panel when selecting a VPS plan. Companies like ScalaHosting has developed their own control panel to mitigate this issue – so their users would have little issues with the price hike.

RAID storage differentials are largely based on the number of disk drives and synchronized duplicate copies of data files available. SSD storage with Docker containers, Kubernetes elastic cloud networks, and isolated VPS/VM partitions are considered fundamentals in cloud data center architecture today. Many shared Linux webhosts make extensive use of SSD storage in VRAM configurations.
A great advantage of VPS, compared to both shared and dedicated solutions is snapshot technology support. A snapshot is a state of a system at a certain point in time. It works like game saves in your favorite computer game. If a game is not going well, you can exit and start from a checkpoint. A snapshot works the same way; if you need to go back in time, your system can be restored from a snapshot to its previous state. It is extremely useful in case of a system failure or simply if you run complex tests and wish to save your progress. Unlike a backup option that copies the whole system each time you run it, a snapshot contains only changes. This means that a snapshot takes less space than a backup and can be created/restored quicker. It does not mean that you do not need backups though. Backups are still life-savers in case of operating system failure. Don’t forget to store them externally.

Most SSD storage drives operate in RAID arrays in data centers including multiple copies of website files for backup purposes in case of hardware failure. SSD storage can also be used as Virtual RAM (VRAM) with much higher performance standards than HDD for caching PHP & MySQL database functions in active memory. Effective use of SSD & VRAM in web servers can save significantly money in corporate IT and has been developed by Twitter in their data centers. Generally, it would not be recommended to sign up for VPS plans implementing HDD storage over SSD options in 2017 for hosting.

 
Buying a VPS plan means that you get your very own virtual server environment. You have full control over the operating system, the extensions and apps you install, and all their settings. Each physical server will still host multiple VPS customers, but not as many as with shared hosting, and typically each VPS will be allocated a share of key resources – RAM, storage space, CPU cores – for their use alone.

A virtual private server (VPS) is ideal for those seeking scalable, reliable hosting resources at a reasonable monthly price. Recently, our team signed up for, tested, and reviewed every major VPS hosting service to find the best combination of uptime, pricing, support, and scalability of all the available VPS hosts. Below are our top recommendations for the best VPS hosting providers:
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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