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作为2012年度世界最大的贸易国，中国长期以来一直是一个劳动力和服务输出大国，即便是在信息技术领域，也和印度的差距越来越小。以亚马逊和DigitalOcean为代表的欧美云计算服务提供商的不断发展壮大，预示着云计算基础设施会成为一种商品，而那些最廉价的提供商则会逐渐受到用户的青睐。

中国网民数量在2013年6月达到了5.91亿，超越了美国和欧洲。把互联网应用和其他内容放在目标用户所在的国家可以有效缩短访问所需时间并提高访问稳定性，所以日益增加的网民数量对本国的互联网基础设施建设提出了要求。

中国云主机市场的极速发展

在过去一年，在中国大陆境内直接连接到国际互联网的Web服务器数量增长了8.3%，且绝大多数增长都来自于云主机市场。在直接连接到国际互联网的Web服务器数量方面，阿里云是目前中国最大的云主机提供商。特别值得一提的是，阿里云拥有的直接连接到国际互联网的Web服务器数量在2013年9月达到了17,934，比去年同期增长了6倍。放眼全球，其增长量仅次于云计算巨头亚马逊。

虽然中国的云计算基础设施建设尚处于起步阶段，但阿里云的未来还是很有希望的，因为它背靠着强大的阿里巴巴集团。阿里巴巴集团是中国拥有直接连接到国际互联网的Web服务器数量最多的公司，也是世界前30名之一，而且该集团旗下的淘宝网和阿里巴巴交易市场等电子商务平台早已在中国家喻户晓。在阿里巴巴集团直接连接到国际互联网的Web服务器当中，有92%来自于阿里云。

Metric	Sep 2012	Mar 2013	Jun 2013	Jul 2013	Aug 2013	Sep 2013
Hostnames	91,553	205,824	382,342	381,989	368,948	389,171
Active sites	23,596	55,654	119,089	116,835	146,310	150,089
Web-facing computers	2,670	8,038	15,931	16,846	17,670	17,934

Detailed view of Aliyun in terms of hostnames (web sites), active sites, and web-facing computers.

本土市场与中国防火长城

尽管中国云主机市场增长迅猛，但是Netcraft发现这些增长绝大多数都来自于面向中国本土市场的网站。把服务器尽可能安置在离终端用户较近的地方可以提高访问性能这一点在中国格外突出：可能是受到金盾工程（亦称中国防火长城）的影响，流入或流出中国大陆的网络数据有时候会很慢，不稳定，甚至被屏蔽。2013年9月，从阿里云连接到国际互联网的网站的域名有一半以上都在.cn顶级域下，有41%是.com，而在其他国家顶级域下的域名则非常少见。由此可推断，与亚马逊的全球化服务不同，阿里云目前还是比较局限于中国本土市场。

TLD share by domains of websites at Aliyun in September 2013

阻碍中国云服务全球的绊脚石

对于想吸引中国用户或访客的外国企业来说，使用中国境内的云主机是很有意义的，但是会遇到一些障碍。这些障碍也正解释了为什么中国云目前面向的主要还是本国用户且这种情况很可能还会持续一段时间：

• 和最廉价的外国云主机提供商相比，中国云主机提供商在价格和操作系统等配置选择的多样性上都没有优势。以阿里云为例，除非选择2核或4核的CPU，否则按量付费的云主机不支持Windows操作系统，而且其价格也不比那些更成熟的竞争对手便宜。最廉价的按量付费的阿里云主机为单核CPU，512M内存，1Mbps带宽，价格每小时0.27元（约合0.04美金），几乎是亚马逊最便宜的云主机价格的两倍，而配置相近的DigitalOcean云主机的价格仅为每小时0.007美金。但是，由于定价模式的差异，包年包月的阿里云主机在某些情况下会比包年包月的亚马逊或DigitalOcean更便宜。
• 从海外访问中国境内的网站有时不够顺畅 - 从英国发送到阿里云官方网站的数据包往返几乎要耗时半秒钟，而从美国访问的效果也没有好很多。在过去20天，有多达4%的来自荷兰的访问请求都以失败告终。



Performance of www.aliyun.com from a Netcraft performance collector located in the Netherlands



• 很多中国主机服务提供商只支持中文。以阿里云为例，无论是官方网站、控制面板还是技术支持，中文都是其唯一的语言。不过，亚马逊云对中文的支持也几乎一样有限 - 只有首页有中文版。
• 有些中国主机服务提供商只面向中国客户。例如：申请使用阿里云服务的用户必须要有一个中国的手机号来接收验证码以完成注册。按量付费的用户必须通过身份验证，而只有中国或个别亚太地区国家的公民或者中国的企业可以做这样的验证。想使用阿里云服务的客户还必须有一张与支付宝兼容的中国的银行卡。如果服务器需要通过域名访问，那么还必须在工信部备案，而这样的备案并不向外国企业开放。

这些障碍意味着中国的云主机服务目前还不太可能冲出中国，面向世界。但是，伴随着来自阿里云这样的本地提供商和微软、亚马逊这样的海外提供商之间的竞争，中国的云服务器数量很有可能会继续增长，来满足国内日益增多的需求。微软为了将其云主机服务打入中国市场，已经开始与中国的一家名为世纪互联的基础设施服务提供商进行合作，并且正在为中国市场定制极具竞争力的价格计划。也许通过这样的模式，其他外国企业（比如亚马逊）也可以将其云主机服务打入中国市场，不仅提供本地的数据中心，同时也争取在严格的监管环境下为中国客户提供支持。同样的，如果上述这些障碍能够在一定程度上得到解决，相信阿里云和其他中国云主机提供商也能够在国际大舞台上获得更多的市场份额。

Netcraft提供国际互联网基础设施方面的信息，包括主机服务提供商、网页技术等等。想了解更多关于云计算行业的信息，请访问 http://www.netcraft.com/internet-data-mining/。

[中文版]

China, the world's largest trading nation in 2012, has long been a desirable location for outsourcing labour and services, even within the technology and IT sector where it is not far behind India. The growth of cloud computing providers in Europe and the United States — particularly Amazon and DigitalOcean — may foretell cloud computing infrastructure becoming a commodity and outsourced to the cheapest provider.

The ever-increasing number of internet users in China (591 million at the end of June 2013) requires the development of home-grown internet infrastructure: hosting web applications and other content within a target user's own country typically speeds up requests and improves reliability. The number of internet users in China is greater than either the United States or Europe.

Stratospheric growth in Chinese cloud hosting

Although the number of web-facing computers in China has grown by 8.3% over the last year — the majority of this growth has occurred within the cloud hosting market. Aliyun (云, pronounced 'yun', is the Chinese word for cloud) is the largest cloud computing provider in China in terms of the number of web-facing computers, and remarkably, Aliyun now has six times more web-facing computers than it did a year ago, reaching a total of 17,934 in September 2013. Worldwide, only the cloud computing giant Amazon gained a greater number of web-facing computers.

Although China's cloud computing infrastructure is still in its infancy, Aliyun's future looks particularly promising, as it is owned by the Alibaba Group. This group is the largest hosting provider in China, features within the top 30 hosting providers worldwide, and has already established a strong internet presence with its better known e-commerce platforms, Taobao and Alibaba.com. Aliyun now makes up almost 92% of the web-facing computers at Alibaba Group.

Metric	Sep 2012	Mar 2013	Jun 2013	Jul 2013	Aug 2013	Sep 2013
Hostnames	91,553	205,824	382,342	381,989	368,948	389,171
Active sites	23,596	55,654	119,089	116,835	146,310	150,089
Web-facing computers	2,670	8,038	15,931	16,846	17,670	17,934

Detailed view of Aliyun in terms of hostnames (web sites), active sites, and web-facing computers.

Indigenous market and the Great Firewall of China

Despite the strong growth of the Chinese cloud hosting market, most of the growth seen by Netcraft is hosting sites aimed at the Chinese market. Hosting content as close to the end-users as possible increases the performance of the web site, and this effect is particularly prominent in China: internet traffic crossing the border can sometimes appear to be slow, unstable, or even blocked, perhaps as a side-effect of blocks enforced by the Golden Shield Project (also known as the Great Firewall of China). In September 2013, more than half of the domains of websites hosted at Aliyun were in the .cn TLD, around 41% in .com, whilst domains in other ccTLDs appeared to be very rare. Unlike Amazon's global reach, Aliyun's reach appears to be limited to the local market — at least for the time being.

TLD share by domains of websites at Aliyun in September 2013

Obstacles holding back the Chinese cloud

Using cloud hosting in China could make sense for non-Chinese companies looking to increase their presence in China; however, a number of obstacles remain. These explain why the Chinese cloud is still mostly indigenous, and is likely to remain so for some time:

• Neither the pricing models nor the variety or operating systems are as attractive as those offered by the cheapest non-Chinese cloud hosting companies. Taking Aliyun as an example, its on-demand instances do not support Windows operating systems unless you opt for a 2-core or 4-core CPU, and they are not significantly cheaper than its more established competitors. The cheapest on-demand option at Aliyun is ¥0.27 ($0.04) per hour which buys you a single core, 512MB of RAM, and a 1Mbps internet connection. This is almost twice the price of Amazon's cheapest option and a comparable DigitalOcean instance can be had for just $0.007 per hour. However, as pricing models vary, reserved instances at Aliyun can be cheaper in some circumstances.
• Internet connectivity from outside China can be patchy — packets sent to www.aliyun.com from the United Kingdom take almost half a second to make the journey and back again, and the performance in the United States is not much better. More than 4% of requests to www.aliyun.com from the Netherlands failed during the past 20 days.



Performance of www.aliyun.com from a Netcraft performance collector located in the Netherlands



• Many Chinese hosting services are only available in the Chinese language. This is the only language available for Aliyun's brochure website, control panel, and technical support. However, Amazon's support for the Chinese language is almost as limited — a single marketing site appears to be the sole Chinese-language site for AWS.
• Some Chinese hosting companies only accept business from Chinese customers. For example, Aliyun's customers are required to have a Chinese mobile phone number in order to receive a verification code to complete the signup process. Customers wishing to buy an on-demand instance at Aliyun must go through an identity verification process, which requires the registrant to be a national of China or one of a few other Asia-Pacific countries, or to represent a Chinese company. Customers must also hold a credit or debit card issued by a Chinese bank compatible with Alipay. Customers must also register with the Chinese Ministry of Industry and Information Technology if they wish to associate a domain name with an Aliyun cloud server, but such registration is currently unavailable to foreign enterprises.

The current obstacles suggest that the cloud is unlikely to be outsourced to China yet. However, the availability of cloud computers in China is likely to increase to match its rapidly increasing local demand with competition both from local providers like Aliyun and overseas players like Microsoft and Amazon. Microsoft has collaborated with a partner company in China, 21Vianet, in order to bring its Cloud to China, and is making competitive price plans customised for the Chinese market. Perhaps by following this model, other non-Chinese companies such as Amazon could enter the Chinese market, providing local data centres and support to Chinese-speaking customers within the stricter regulatory environment. Equally, if some red tape were cut and network connectivity improved, Aliyun and other Chinese cloud providers could be poised to take a larger share of the global cloud computing market.

Netcraft provides information on the internet's infrastructure, including the hosting industry and web content technologies. For information on the cloud computing industry, please see http://www.netcraft.com/internet-data-mining/.

In September 2012 Netcraft reported that Amazon had become the largest hosting company in the world based on the number of web-facing computers. In the last eight months, the e-commerce company's tally of web-facing computers has grown by more than a third, reaching 158k. The number of websites hosted on these computers has also increased, from 6.8M in September 2012 to 11.6M in May 2013, a 71% increase.

Although Amazon’s main business is still online retail, Amazon Web Services (AWS), its cloud computing division, has been growing in significance. In Amazon's first quarter of 2013 the Other category (which still includes AWS along with other non-retail activity) was just under 5.0% of its revenue, up from 3.2% at the same point in 2011. The first publicly available AWS service was launched in 2004, but it was not until 2006 that Amazon launched its two core services S3 (data storage) and EC2 (per-hour rental of virtual computer instances). Since then, Amazon has been increasing the number of services provided: in 2012 alone, 159 new services and features were released.

Including its retail infrastructure, the number of web-facing computers at Amazon has grown more than thirty-fold in four years: in May 2009, Netcraft found 4,600 Amazon-controlled web-facing computers; in May 2013, Netcraft found 158k web-facing computers on 164k IP addresses. Netcraft estimates the number of computers behind a group of IP addresses by using a variety of heuristics based on the TCP/IP characteristics seen in the HTTP responses gathered. Hosted on those computers, there are more than 11.6M websites (or hostnames) which corresponds to 2.1M websites with unique content (active sites). Despite being the largest hosting provider by number of web-facing computers, it is dwarfed by Go Daddy, the largest hosting provider when considering the number of websites hosted. Go Daddy has 37M websites on just 23k web-facing computers: the high ratio of websites to web-facing computers may be indicative of Go Daddy's role as a registrar, for which it has a large network of holding pages, and its inexpensive shared hosting platform.

EC2 - Elastic Compute Cloud

EC2, provides on-demand virtual-computer instances billed per hour and is currently available from all nine AWS regions. Each region may correspond to multiple physical data centres which are structured into "Availability Zones". The two largest regions, US East (Northern Virginia) and EU West (Ireland), account for more than three-quarters of all EC2 usage as measured by Netcraft. Sydney, the newest AWS region, now accounts for just under 1% of all measured web-facing computers using AWS, having almost tripled in size in the past four months. In total, more than 156k instances power at least one hostname on 3M domains across the internet.

Launched in 2011, the GovCloud (US) region is specifically intended for more sensitive applications that require additional security and compliance with US regulations. As of May 2013, Netcraft found just 27 web-facing computers within the government cloud, some of which power www.grdregistry.org and www.govdashboard.com. Given its intended role, it would not be surprising if a large proportion of the computers used in the region are not web-facing.

Notable EC2 users include Netflix, a DVD rental and video streaming service, Instagram, a photo sharing application now owned by Facebook, and DuckDuckGo, a search engine.

Metric (EC2 Total)	February 2013	March 2013	April 2013	May 2013	Growth (4 month)
Web-facing Computers/Instances	141,960	145,648	152,041	156,225	10%
IP Addresses	144,625	148,837	155,712	160,884	11.2%
Domains	2,788,685	2,810,906	2,996,147	3,061,178	9.8%
Hostnames	9,489,496	9,938,480	10,649,545	10,925,661	15.1%

Many uses of EC2 such as batch data-processing will not be directly measurably over the internet: Netcraft measures publicly visible computers with corresponding DNS entries and which respond to HTTP requests. Netcraft's Web Server Survey is run at Amazon from the Northern Virginia region, so the region may be over-reported due to services like latency based multi region routing which provide differing responses depending on topological location.

Geographic distribution of computers per EC2 region in May 2013

Data Centre (EC2 - Web Facing Computers)	February 2013	March 2013	April 2013	May 2013	Growth (4 month)
Asia Pacific (Singapore)	6,576	6,805	6,998	7,290	10.9%
Asia Pacific (Sydney)	499	739	1,129	1,427	186%
Asia Pacific (Tokyo)	7,342	7,595	8,065	8,601	17.1%
EU West (Ireland)	23,778	24,635	25,326	25,942	9.1%
South America (Sao Paulo)	2,115	2,263	2,396	2,655	25.6%
US East (Northern Virginia)	87,094	88,543	92,426	93,537	7.4%
US West (Northern California)	9,325	9,478	9,715	9,695	4%
US West (Oregon)	5,217	5,573	5,965	7,051	35.2%
GovCloud (Oregon)	14	17	21	27	92.9%

S3 - Simple Storage Service

S3 provides an online file storage service which can be managed programmatically via Amazon's API. Files are logically grouped into containers called buckets which can be made public and accessible over HTTP but default to being private. As with EC2, Netcraft cannot track private use of S3 but is able to survey websites using S3 publicly to serve static files and even entire websites.

Metric (S3 Total)	February 2013	March 2013	April 2013	May 2013	Growth (4 month)
Domains	41,782	42,561	45,721	48,636	16.4%
Hostnames	124,454	127,370	132,962	138,588	11.4%

In May 2013, a total of 139k hostnames were found to be hosted directly on S3, either using a subdomain of s3.amazonaws.com or using a custom CNAME pointing to S3. Of these, 24.7k hostnames, or over 18.5k domains, point to an S3 bucket configured to serve an entire website, as does mediahackers.org. Many more websites are not hosted entirely on S3, but make use of the service to serve static files such as images, stylesheets, or file downloads.

One of the most widely referenced S3 hostnames is used for twitter badges bucket, which was once a common method to display twitter icons on a third-party website. Tumblr, a popular blogging platform recently acquired by Yahoo!, also makes use of S3 to host static media.

CloudFront

CloudFront is a Content Delivery Network which can be used to serve both dynamic and static content from 28 edge locations which are topologically closer to a site's visitors. Caching content reduces the bandwidth and performance requirements on the website's own servers and, by being topologically close to visitors, the latency associated with each HTTP request can be improved.

In the May 2013 survey, more than 63k hostnames were served via CloudFront, more than 60% of which point to an S3 bucket. Amazon uses CloudFront on its own websites, including imdb.com, and also uses it for serving images on Amazon.com. Other than Amazon itself, CloudFront users include: the Toronto Star, a Canadian newspaper, and Pirifrom, the makers of utility program CCleaner, are two of the most visited sites using CloudFront amongst users of the Netcraft Toolbar.

Metric (CloudFront Total)	February 2013	March 2013	April 2013	May 2013	Growth (4 month)
Domains	22,920	24,079	25,264	26,221	14.4%
Hostnames	55,578	57,817	60,475	63,203	13.7%

The number of CloudFront-dedicated IP addresses and computers cannot be easily measured as different results are obtained depending on the location of the request.

Route 53

Route 53, is a managed Domain Name System (DNS) hosting service. Route 53, named for the TCP and UDP port used for the protocol, hosts DNS records which map from human-readable hostnames to IP addresses. Integrated with the rest of AWS, it allows programmatic access to change DNS records in response to changes elsewhere in a customer's infrastructure. As with CloudFront, Amazon have servers providing this service in edge locations outside of its 9 EC2 regions; Route 53 is available from 28 separate locations.

Metric (Route 53 Total)	February 2013	March 2013	April 2013	May 2013	Growth (4 month)
Domains	136,698	146,635	161,619	169,111	23.7%
Hostnames	3,493,986	3,662,195	3,831,910	4,068,053	16.4%

Over the past four months there has been a steady growth in the number of websites using Route 53 to host their DNS records: it now serves DNS records for 169k domains. Busy sites making use of this service include pinterest.com, a social photo-sharing website which is a heavy user of Amazon's infrastructure; MediaFire, a file uploading and sharing service; and ow.ly a URL shortener.

Heroku

Heroku is Platform as a Service (PaaS) provider owned by Salesforce. Whilst not operated by Amazon, it makes heavy use of AWS services, especially EC2. Heroku provides an abstracted managed environment for web developers to deploy applications in a number of different languages. In May 2013, Heroku was serving 70K domains directly (not behind a CDN) across 4,786 computers.

Popular sites using Heroku include www.upworthy.com, a curated news website; help.github.com, a knowledge base for the popular git-based project hosting service; and Absolventa, a German job market.

Metric (Heroku total)	April 2013	May 2013	Growth (2 month)
Computers	4,293	4,786	11.5%
IP Addresses	4,408	4,972	12.8%
Domains	65,821	69,781	6%
Hostnames	1,094,578	1,102,663	0.7%

Heroku, as demonstrated in the results from Netcraft's survey, has been available almost exclusively from the Northern Virginia EC2 region. In April, Heroku announced availability of its service in Europe from the AWS EU West region based in Ireland. Only a limited number of Heroku customers have had access to this region during a private beta phase which explains the currently low uptake: only 1% of the computers attributed to Heroku were in the region.

IP Addresses	April 2013	May 2013
US East (Northern Virginia)	4,374	4,915
EU West (Ireland)	33	56

Summary

The launch of the new AWS region, hundreds of new services, new partnerships, and multiple price reductions, are a clear indicator of the relentless growth of Amazon Web Services.

Netcraft provides information on the Internet infrastructure, including the hosting industry, and web content technologies. For information on the cloud computing industry including Microsoft Azure, Rackspace Cloud, and Google App Engine, please contact sales@netcraft.com.