Welcome!

Cloud Security Authors: Elizabeth White, Jim Hansen, Allwyn Sequeira, Shelly Palmer, Liz McMillan

Related Topics: Microsoft Cloud, Silverlight, Agile Computing, @CloudExpo, Cloud Security

Microsoft Cloud: Article

Wildcard Subdomains in Windows Azure

Want to support my.fancy.app.can.serve.up.anything.mybrand.com in your Windows Azure application?

Now, once you do this, all traffic for all subdomains of adamhoffman.net is routed to wildcardsubdomain.cloudapp.net. This is true not only of 3rd level subdomains, but also of 4th level (hello.world.adamhoffman.net) and all levels beyond it (this.is.really.cool.adamhoffman.net). Once we have this, it's really just a matter of inspecting the request to make multi-tenant decisions in our application code using Request.Url.Host which will contain the full domain name that was originally asked for in the request (not the cloudapp.net name), like this:

protected void Page_Load(object sender, EventArgs e)
{
	string[] domainparts = Request.Url.Host.Split(new char[] { '.' });
	if (domainparts.Length > 2)
	{
		// there must be a subdomain in front of the two last parts 
		// (i.e. xxx.adamhoffman.net or xxx.yyy.adamhoffman.net, etc.)
		System.Text.StringBuilder sbOut = new System.Text.StringBuilder("Subdomain Segments: <br/>");
		for (int i = 0; i < domainparts.Length - 2; i++)
		{
			sbOut.Append(domainparts[i] + "<br/>");
		}

		this.output.Text = sbOut.ToString();
	}
}

Now, some of you are saying, hey, can't I use the page routing features of ASP.NET or the MVC framework to add routes to this party as well? Again, yes and no. The out of the box routing functionality does not appear to support subdomain routing, but Maarten Balliauw has done some work to extend it and make this possible. While this is a potential nicety, it's not actually necessary to figure out what subdomain was the source of an original request, and therefore we won't cover that here.

To be sure, there are many DNS providers out there that support wildcard CNAMEs. Route 53 is one of them, and Go Daddy is not. If you've successfully done this with a different DNS provider, drop me a line and I'll add the details here.

Source code is here.

Interesting side note - it appears that you can actually use A records and rely on the IP of an Azure deployment as long as you don't delete and redeploy your, um, deployment... I still wouldn't recommend it, since you'll undoubtedly forget to update your DNS servers the one time you do actually delete and redeploy. Nonetheless, good reading on the subject is here.

Ready to try this yourself? Get a FREE 90 Day trial of Windows Azure here.

More Stories By Adam Hoffman

Adam is an technical evangelist working for Microsoft. By day, you can likely find him somewhere in the Midwest, driving to somewhere, ready to figure out how the cloud can save your family from certain doom, and make you rich and successful in the process. Before he started evangelizing, Adam was a Senior Developer Lead for Microsoft in Redmond, working on Office 365, BPOS, and Office Live. He misses Redmond, and the excitement of the mother ship, but the call of bitter cold and lots of snow in Chicago was too much for him, and he had to return.

Prior that that he developed software and ran teams for Thomson Reuters, Method Engine (which he co-founded), VSA Partners, Navigant Consulting, Andersen Consulting, and a couple of CASE tool companies way back in the day. His favorite possession is a clone of the original Altair computer, running BillG's 8K BASIC, which he's still intending to hook up to the cloud, someday, somehow.

You can read his Windows Azure Blog at http://stratospher.es, and tweeter-er him at http://twitter.com/stratospher_es.

Additionally, if you'd like to keep track of his cloud connected car, you can follow it on Twitter at http://twitter.com/cloudcar1.

@ThingsExpo Stories
SYS-CON Events announced today that Infranics will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Since 2000, Infranics has developed SysMaster Suite, which is required for the stable and efficient management of ICT infrastructure. The ICT management solution developed and provided by Infranics continues to add intelligence to the ICT infrastructure through the IMC (Infra Management Cycle) based on mathemat...
SYS-CON Events announced today that SD Times | BZ Media has been named “Media Sponsor” of SYS-CON's 20th International Cloud Expo, which will take place on June 6–8, 2017, at the Javits Center in New York City, NY. BZ Media LLC is a high-tech media company that produces technical conferences and expositions, and publishes a magazine, newsletters and websites in the software development, SharePoint, mobile development and commercial UAV markets.
SYS-CON Events announced today that Cloudistics, an on-premises cloud computing company, has been named “Bronze Sponsor” of SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Cloudistics delivers a complete public cloud experience with composable on-premises infrastructures to medium and large enterprises. Its software-defined technology natively converges network, storage, compute, virtualization, and management into a ...
Now that the world has connected “things,” we need to build these devices as truly intelligent in order to create instantaneous and precise results. This means you have to do as much of the processing at the point of entry as you can: at the edge. The killer use cases for IoT are becoming manifest through AI engines on edge devices. An autonomous car has this dual edge/cloud analytics model, producing precise, real-time results. In his session at @ThingsExpo, John Crupi, Vice President and Eng...
SYS-CON Events announced today that Loom Systems will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Founded in 2015, Loom Systems delivers an advanced AI solution to predict and prevent problems in the digital business. Loom stands alone in the industry as an AI analysis platform requiring no prior math knowledge from operators, leveraging the existing staff to succeed in the digital era. With offices in S...
SYS-CON Events announced today that HTBase will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. HTBase (Gartner 2016 Cool Vendor) delivers a Composable IT infrastructure solution architected for agility and increased efficiency. It turns compute, storage, and fabric into fluid pools of resources that are easily composed and re-composed to meet each application’s needs. With HTBase, companies can quickly prov...
There are 66 million network cameras capturing terabytes of data. How did factories in Japan improve physical security at the facilities and improve employee productivity? Edge Computing reduces possible kilobytes of data collected per second to only a few kilobytes of data transmitted to the public cloud every day. Data is aggregated and analyzed close to sensors so only intelligent results need to be transmitted to the cloud. Non-essential data is recycled to optimize storage.
"I think that everyone recognizes that for IoT to really realize its full potential and value that it is about creating ecosystems and marketplaces and that no single vendor is able to support what is required," explained Esmeralda Swartz, VP, Marketing Enterprise and Cloud at Ericsson, in this SYS-CON.tv interview at @ThingsExpo, held June 7-9, 2016, at the Javits Center in New York City, NY.
SYS-CON Events announced today that SoftLayer, an IBM Company, has been named “Gold Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2016, at the Javits Center in New York, New York. SoftLayer, an IBM Company, provides cloud infrastructure as a service from a growing number of data centers and network points of presence around the world. SoftLayer’s customers range from Web startups to global enterprises.
SYS-CON Events announced today that IoT Now has been named “Media Sponsor” of SYS-CON's 20th International Cloud Expo, which will take place on June 6–8, 2017, at the Javits Center in New York City, NY. IoT Now explores the evolving opportunities and challenges facing CSPs, and it passes on some lessons learned from those who have taken the first steps in next-gen IoT services.
SYS-CON Events announced today that Interoute, owner-operator of one of Europe's largest networks and a global cloud services platform, has been named “Bronze Sponsor” of SYS-CON's 20th Cloud Expo, which will take place on June 6-8, 2017 at the Javits Center in New York, New York. Interoute is the owner-operator of one of Europe's largest networks and a global cloud services platform which encompasses 12 data centers, 14 virtual data centers and 31 colocation centers, with connections to 195 add...
SYS-CON Events announced today that MobiDev, a client-oriented software development company, will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place June 6-8, 2017, at the Javits Center in New York City, NY, and the 21st International Cloud Expo®, which will take place October 31-November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. MobiDev is a software company that develops and delivers turn-key mobile apps, websites, web services, and complex softw...
DevOps is often described as a combination of technology and culture. Without both, DevOps isn't complete. However, applying the culture to outdated technology is a recipe for disaster; as response times grow and connections between teams are delayed by technology, the culture will die. A Nutanix Enterprise Cloud has many benefits that provide the needed base for a true DevOps paradigm.
What sort of WebRTC based applications can we expect to see over the next year and beyond? One way to predict development trends is to see what sorts of applications startups are building. In his session at @ThingsExpo, Arin Sime, founder of WebRTC.ventures, will discuss the current and likely future trends in WebRTC application development based on real requests for custom applications from real customers, as well as other public sources of information,
Keeping pace with advancements in software delivery processes and tooling is taxing even for the most proficient organizations. Point tools, platforms, open source and the increasing adoption of private and public cloud services requires strong engineering rigor - all in the face of developer demands to use the tools of choice. As Agile has settled in as a mainstream practice, now DevOps has emerged as the next wave to improve software delivery speed and output. To make DevOps work, organization...
As businesses adopt functionalities in cloud computing, it’s imperative that IT operations consistently ensure cloud systems work correctly – all of the time, and to their best capabilities. In his session at @BigDataExpo, Bernd Harzog, CEO and founder of OpsDataStore, will present an industry answer to the common question, “Are you running IT operations as efficiently and as cost effectively as you need to?” He will expound on the industry issues he frequently came up against as an analyst, and...
Apache Hadoop is emerging as a distributed platform for handling large and fast incoming streams of data. Predictive maintenance, supply chain optimization, and Internet-of-Things analysis are examples where Hadoop provides the scalable storage, processing, and analytics platform to gain meaningful insights from granular data that is typically only valuable from a large-scale, aggregate view. One architecture useful for capturing and analyzing streaming data is the Lambda Architecture, represent...
My team embarked on building a data lake for our sales and marketing data to better understand customer journeys. This required building a hybrid data pipeline to connect our cloud CRM with the new Hadoop Data Lake. One challenge is that IT was not in a position to provide support until we proved value and marketing did not have the experience, so we embarked on the journey ourselves within the product marketing team for our line of business within Progress. In his session at @BigDataExpo, Sum...
Things are changing so quickly in IoT that it would take a wizard to predict which ecosystem will gain the most traction. In order for IoT to reach its potential, smart devices must be able to work together. Today, there are a slew of interoperability standards being promoted by big names to make this happen: HomeKit, Brillo and Alljoyn. In his session at @ThingsExpo, Adam Justice, vice president and general manager of Grid Connect, will review what happens when smart devices don’t work togethe...
SYS-CON Events announced today that Ocean9will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Ocean9 provides cloud services for Backup, Disaster Recovery (DRaaS) and instant Innovation, and redefines enterprise infrastructure with its cloud native subscription offerings for mission critical SAP workloads.