How to choose and buy the most suitable US VPS for yourself?

With the rapid development of the Internet, many individuals or companies need to build a website. You may choose a virtual host as the platform for your website at the beginning, but as the traffic of your website grows, or you find that the virtual space can no longer meet your performance requirements, and the independent server is still too expensive for small and medium-sized enterprises or individuals. At this time, VPS appears in front of everyone as a good choice.

1. What is VPS (Virtual Private Server)

VPS (Virtual Private Server) technology is a high-quality service that divides a server into multiple isolated virtual private servers. The operation and management of each VPS are exactly the same as those of an independent host, and can be allocated an independent public IP address, independent operating system, independent large space, independent memory, independent CPU resources, independent execution programs and independent system configuration, etc. In addition to being able to allocate multiple virtual hosts and unlimited corporate mailboxes, users also have independent server functions, can install programs by themselves, and restart the server independently. In short, VPS is a server solution with high flexibility, high quality and cost-effectiveness, and is the best choice for high-end virtual host users. You are no longer affected by other user programs, and you get a fairer resource allocation, which is much lower than the failure rate of the virtual host. (source)
To put it simply, VPS can obtain higher permissions and user experience than ordinary virtual hosts. Generally, each VPS comes with at least one independent IPv4 or IPv6. You can build a website at will, install system expansions at will, and install the software you need at will. In short, under the highly virtualized technology, VPS and independent servers are almost the same. In fact, the performance of a well-configured VPS is far superior to that of an independent server with general configuration.

2. Virtualization technologies generally used by domestic and foreign VPS merchants

With the development of technology, various virtualization technologies have emerged at this stage. Even many unscrupulous businesses at home and abroad are selling VPS under the slogan of "cloud hosting". According to statistics, the main popular VPS virtualization technologies are:

• 1. Xen
• 2. OpenVZ
• 3. Virtuozzo (OpenVZ Commercial Edition)
• 4. KVM
• 5. VMWare
• 6. Hyper-V

Most domestic and foreign Linux VPS vendors use Xen or OpenVZ, and most Windows VPS vendors use Xen or Hyper-V or VMWare EXSi (the latter two have the highest degree of Windows virtualization and performance, and the highest technical requirements, which are not within the scope of this article.)
Since this article is about how to choose and buy the most suitable VPS for yourself, I will not introduce the above virtualization technologies in detail. Based on the experience accumulated in the past few years, I will briefly introduce the advantages and disadvantages of Xen, OpenVZ and KVM:
1. Xen
Advantages: When resources are limited, overselling is basically impossible. However, many VPS vendors on the market use servers with extra-large memory to sell Xen VPS, which is the so-called disguised overselling.
Disadvantages: Because it is fully virtualized, each VPS environment and server are isolated. This is the advantage of Xen, but also a disadvantage, because the resources of the VPS are evenly distributed. If you open a Xen VPS on your own server for your own use, the performance will be affected to a certain extent. But for users, buying a Xen VPS is much more reliable than OpenVZ.
2. OpenVZ
Advantages: Paravirtualization technology, all VPS files are placed on the server where they are located. Under the same performance test, OpenVZ will have certain advantages over Xen. Disadvantages: It can be completely oversold, and you can sell as many units as you want. Because service providers need to ensure their own profits, OpenVZ will generally be much cheaper than Xen. This depends on the oversell level of the service provider, so the general public has the impression that the performance of OpenVZ cannot be compared with Xen. At the same time, since all OpenVZ VPS files are placed directly on the server, once the server system files are damaged, all OpenVZ VPS systems will be damaged. Based on this, I strongly do not recommend purchasing OpenVZ VPS.
3. KVM
Advantages: You can load iso by yourself to perform system installation and other operations, which is more suitable for users who like DIY. Disadvantages: Currently, KVM technology is very immature, both at home and abroad. When the technology of KVM VPS matures in the future, it is bound to cause a storm.
Unless you are a server administrator, you generally cannot verify what the merchant says. Therefore, in any case, I still recommend Xen VPS, which has a relatively good degree of isolation and mature technology. This is why everyone in domestic and foreign forums generally likes Xen VPS.

3. Overselling Tricks of VPS Hosting Providers

For Xen or KVM virtualization technology, there is a very simple way to oversell, which is to use super-high-configuration servers (large memory, large hard disk, advanced CPU) to sell VPS. Then, originally one server can only sell 30 VPS, but after using a high-configuration server, one server can sell hundreds of VPS. There is no doubt that for users, there will be unnecessary risks, because your neighbor may use a program that takes up a lot of CPU or hard disk I/O resources, causing damage to the performance of the overall server. To put it more seriously, if the server hardware breaks down, hundreds of customers will be affected. If it is a Xen VPS that is not oversold, then only dozens of customers may be affected, which reduces your risk.
For OpenVZ, as long as the host provider is willing and there are enough IPs, you can open as many VPSs as you want on the server until the hard disk runs out.
Because you cannot verify how many VPS a merchant sells for one server, and KVM virtualization technology is not yet fully mature, and some other virtualization technologies are mostly commercial-level rather than open source-level like Xen, so I recommend that users choose Xen VPS when purchasing.

4. How to choose a VPS that suits you

1. Clarify the purpose of using VPS <br /> If your website develops and the virtual space can no longer meet your needs, and the price of a dedicated server is too expensive, then VPS is your choice.
If your website requires special programs and ordinary virtual space cannot meet your needs, then VPS is your choice.
If you want to build some environment by yourself, or learn the technology of Linux or Windows server, then VPS is your choice.
2. Don’t exceed your budget <br /> You get what you pay for. This principle also applies to your choice of VPS. A cheap VPS can be used for training or to place a small website with low traffic. However, if it is used to place a website with large traffic, the resources may not meet your needs. The cheaper the VPS, the more oversold the server will be. In the end, businesses need to ensure their own profit margins to survive.
Shop around. From selecting a VPS to purchasing a VPS, you must compare the parameters and prices of several merchants you want to buy from, from memory, CPU, hard disk, traffic, to price, payment method, search and after-sales service, etc.
The current common prices in the market are:
512M memory, 20G hard disk, 200 to 500G traffic - 99 yuan per month. If the price is lower than this, the merchant's profit will be small or there will be serious overselling; if the price is higher than this, the merchant's profit will be slightly larger, but at the same time you also need to meet your own budget.
1G memory, 2G memory and the like only need to calculate the price of 512M memory proportionally, which is usually the normal price.
3. Don’t believe in the so-called unlimited traffic <br /> Unlimited traffic? Does this infinity mean no [limit] or no [upper limit]? 99.9% of the businesses that claim unlimited or unlimited traffic will limit your bandwidth. Traffic is generated by bandwidth, and the server has limited bandwidth. Even if it runs at full capacity 24 hours a day, it can only run this much traffic in a month. For example, if the server has 10M bandwidth, then at most it can run 3.3TB of traffic in a month. If the server has 100M bandwidth, then at most it can run about 33TB of traffic in a month.
Generally, many domestic merchants provide VPS with unlimited traffic, and some are even located in Hong Kong data centers or BGP data centers. As we all know, the bandwidth of these data centers is very expensive, and merchants do not want to lose money. If you use their VPS and you need a large amount of traffic, your bandwidth will generally be limited, causing slow access to your VPS, etc.
Therefore, I recommend purchasing a VPS with limited traffic rather than limited bandwidth. This way, traffic can be reasonably distributed to all users. You will only be allocated as much as you need without forcibly limiting your bandwidth.
4. Observe domestic and foreign forums to understand the after-sales service of VPS host providers . You can visit domestic and foreign host forums and blogs to observe. We recommend the Global Host Exchange Forum, Web Hosting Talk, etc.
5. Observe the lines of the VPS provider <br /> As we all know, in China, network lines are very complicated. Telecom, Netcom (China Unicom), Tietong, and so on are all connected. When accessing the computer room in the United States, sometimes the lines are blocked.

As for how to view the line, start >> run, enter cmd, enter tracert ip (or domain name) in the pop-up window, and you can see the line from your network to the service provider's network.

Relatively strong service providers will have direct lines to China Telecom or China Unicom. For example, XeHost.com, a subsidiary of Jiesu Network Technology Co., Ltd., recently cooperated with ChinaCache (Bluexun) to launch four direct lines to China Telecom in Los Angeles. According to insiders, there will also be direct lines to China Unicom in the near future. This is basically the most stable and highest quality line for visiting the United States from the mainland.

5. Why use a US VPS?

1. The computer rooms in the United States are the best in the world in terms of facilities, personnel, and bandwidth, which is an advantage that domestic computer rooms cannot achieve. In addition, the United States is the birthplace of the Internet, and various technologies will be first implemented in American computer rooms and will be more mature and stable.
2. The United States has sufficient bandwidth and IP resources, which is why VPS in China, Hong Kong or other Asian countries are significantly more expensive than US VPS with the same configuration.
3. If you need to build multiple websites, or you don’t like China’s filing system, then the American VPS is your best choice. In some computer rooms directly connected to China Telecom and China Unicom, except for the physical distance, the speed of accessing the website can basically be the same.

6. Recommended VPS at home and abroad

Due to language, time difference, dual-currency credit cards and other reasons, not all users are suitable to buy VPS directly from foreign merchants. In recent years, many excellent domestic Xen VPS providers have emerged, which are also worthy of your choice.
Among foreign Xen VPS providers, I recommend Linode, which has always been very stable but is a bit expensive. Unfortunately, it does not have a Windows system, and recently many Chinese people are using the Tokyo data center, resulting in poor telecommunications access speeds at the Tokyo data center at night.
Among the domestic Xen VPS providers, we recommend XeHost.com, the only one in China that cooperates with ChinaCache's Los Angeles data center. In addition to advantages such as direct connection with China Telecom (China Unicom will also have direct connection in the near future), XeHost, after years of perfecting its technology, uses the world's leading Xen + SolusVM control panel. You can directly start, shut down, restart, reinstall the system and perform other operations in the SolusVM control panel. Moreover, XeHost will never oversell. We will sell as many resources to users as the server has, and we will also reserve a portion of the hard disk space for templates or backup operations. It is trustworthy.
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