|By Lori MacVittie||
|April 3, 2013 10:00 AM EDT||
If you're immersed in the world of service providers (sometimes called carriers, telecoms, or carrier service providers) then you've probably heard the term "traffic steering."
Trafﬁc steering is the ability to control and direct data and voice trafﬁc to the best suitable cell layer and radio technology within any network. It becomes a key feature in LTE networks deployed over multiple layers, such as frequency layers and/or hierarchy layers as macro, pico or femtocells.Those networks make available resources from multiple layers to an end-user in a certain geographical area. Therefore, trafﬁc steering could optimise network capacity and user experience via an efﬁcient utilisation of the whole pool of available resources (e.g. radio,transport, backhaul).
A similar concept, HTTP Message Steering, is used in data center networks to provide this same type of capabilities with respect to routing HTTP requests and responses to services as determined to be appropriate based on operational and business requirements.
Now, more astute readers will immediately ask the question, "How is this different from content switching (or content steering, if we want to adopt modern nomenclature)?"
It's a good question, and one that deserves an answer. Content steering executes very similar logic in that it is able to determine how to route or handle HTTP requests based on the context of the request.
The thing with content steering (or page routing or whatever the nom de jour might be this year) is that it's self-contained. Whatever variables are used to determine how to route the request had better be either in the content, on the system, or able to be deduced from the connections between client and intermediary, intermediary and client.
HTTP Message Steering, like it's cousin traffic steering, implies the use of an external, off-the-box service to augment the data upon which the routing decision is made. If we take (again, because I like this use case) API metering, it is fairly obvious that the intermediate proxy is not going to be storing the data necessary to determine whether a given request will exceed a user's quota. Proxies store session-related data, but do not weight themselves down with the mechanisms and memory needed to store long term data. A failure, remember, means anything in memory necessarily disappears, and something like API usage metrics is not something you want lost. It's longer term, it exists outside any given session. It's persistent, in developer-speak, and thus requires a more permanent means of storage to ensure it continues to exist across sessions.
Thus, if an intermediate proxy requires persistent data to make a routing decision, we call it message steering to differentiate it from the more near-term, session-constrained content steering. The differentiation is necessary because it has architectural ramifications that need to be considered. If you want to be able to execute HTTP message steering then you are going to need a proxy. Period.
That's because only a true (full) proxy terminates (acts as the client destination) the underlying TCP connection. Because there is a clear separation between client-side and server-side, a proxy can steer a message in any direction - including to a third-party persistent data service. A solution that is not a true proxy can only perform content steering, because it doesn't have the mechanisms required to initiate a connection on its own; it's purely a seamstress, stitching up a connection between the client and the application service and maintaining the flow between them. A proxy intercedes, it intercepts, it inspects and redirects if necessary. It can take other action because technically it is the destination end-point.
HTTP Message Steering is a component of an application layer SDN; programmatically enabling the routing of requests and responses to services in the data center fabric based on policy. It is one of the core technologies comprising an application layer SDN and the underlying nature of a proxy-based application network service is the foundation upon which such solutions are built.
Sharding has become a popular means of achieving scalability in application architectures in which read/write data separation is not only possible, but desirable to achieve new heights of concurrency. The premise is that by splitting up read and write duties, it is possible to get better overall performance at the cost of a slight delay in consistency. That is, it takes a bit of time to replicate changes initiated by a "write" to the read-only master database. It's eventually consistent, and it'...
Jul. 27, 2016 08:15 PM EDT Reads: 2,110
There's a lot of things we do to improve the performance of web and mobile applications. We use caching. We use compression. We offload security (SSL and TLS) to a proxy with greater compute capacity. We apply image optimization and minification to content. We do all that because performance is king. Failure to perform can be, for many businesses, equivalent to an outage with increased abandonment rates and angry customers taking to the Internet to express their extreme displeasure.
Jul. 27, 2016 03:30 PM EDT Reads: 1,578
Right off the bat, Newman advises that we should "think of microservices as a specific approach for SOA in the same way that XP or Scrum are specific approaches for Agile Software development". These analogies are very interesting because my expectation was that microservices is a pattern. So I might infer that microservices is a set of process techniques as opposed to an architectural approach. Yet in the book, Newman clearly includes some elements of concept model and architecture as well as p...
Jul. 27, 2016 02:30 PM EDT Reads: 9,715
No matter how well-built your applications are, countless issues can cause performance problems, putting the platforms they are running on under scrutiny. If you've moved to Node.js to power your applications, you may be at risk of these issues calling your choice into question. How do you identify vulnerabilities and mitigate risk to take the focus off troubleshooting the technology and back where it belongs, on innovation? There is no doubt that Node.js is one of today's leading platforms of ...
Jul. 27, 2016 11:15 AM EDT Reads: 264
SYS-CON Events announced today that LeaseWeb USA, a cloud Infrastructure-as-a-Service (IaaS) provider, will exhibit at the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. LeaseWeb is one of the world's largest hosting brands. The company helps customers define, develop and deploy IT infrastructure tailored to their exact business needs, by combining various kinds cloud solutions.
Jul. 27, 2016 10:30 AM EDT Reads: 1,227
Adding public cloud resources to an existing application can be a daunting process. The tools that you currently use to manage the software and hardware outside the cloud aren’t always the best tools to efficiently grow into the cloud. All of the major configuration management tools have cloud orchestration plugins that can be leveraged, but there are also cloud-native tools that can dramatically improve the efficiency of managing your application lifecycle. In his session at 18th Cloud Expo, ...
Jul. 27, 2016 10:30 AM EDT Reads: 1,085
Ovum, a leading technology analyst firm, has published an in-depth report, Ovum Decision Matrix: Selecting a DevOps Release Management Solution, 2016–17. The report focuses on the automation aspects of DevOps, Release Management and compares solutions from the leading vendors.
Jul. 27, 2016 10:00 AM EDT Reads: 1,748
SYS-CON Events announced today that Venafi, the Immune System for the Internet™ and the leading provider of Next Generation Trust Protection, will exhibit at @DevOpsSummit at 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Venafi is the Immune System for the Internet™ that protects the foundation of all cybersecurity – cryptographic keys and digital certificates – so they can’t be misused by bad guys in attacks...
Jul. 27, 2016 09:15 AM EDT Reads: 1,376
Let's just nip the conflation of these terms in the bud, shall we?
"MIcro" is big these days. Both microservices and microsegmentation are having and will continue to have an impact on data center architecture, but not necessarily for the same reasons. There's a growing trend in which folks - particularly those with a network background - conflate the two and use them to mean the same thing.
They are not.
One is about the application. The other, the network. T...
Jul. 27, 2016 04:30 AM EDT Reads: 3,585
This is a no-hype, pragmatic post about why I think you should consider architecting your next project the way SOA and/or microservices suggest. No matter if it’s a greenfield approach or if you’re in dire need of refactoring. Please note: considering still keeps open the option of not taking that approach. After reading this, you will have a better idea about whether building multiple small components instead of a single, large component makes sense for your project. This post assumes that you...
Jul. 27, 2016 03:45 AM EDT Reads: 4,200
DevOps at Cloud Expo – being held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA – announces that its Call for Papers is open. Born out of proven success in agile development, cloud computing, and process automation, DevOps is a macro trend you cannot afford to miss. From showcase success stories from early adopters and web-scale businesses, DevOps is expanding to organizations of all sizes, including the world's largest enterprises – and delivering real results. Am...
Jul. 27, 2016 02:45 AM EDT Reads: 2,305
The 19th International Cloud Expo has announced that its Call for Papers is open. Cloud Expo, to be held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, brings together Cloud Computing, Big Data, Internet of Things, DevOps, Digital Transformation, Microservices and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding business opportuni...
Jul. 27, 2016 02:15 AM EDT Reads: 2,619
If you are within a stones throw of the DevOps marketplace you have undoubtably noticed the growing trend in Microservices. Whether you have been staying up to date with the latest articles and blogs or you just read the definition for the first time, these 5 Microservices Resources You Need In Your Life will guide you through the ins and outs of Microservices in today’s world.
Jul. 27, 2016 01:15 AM EDT Reads: 4,071
Before becoming a developer, I was in the high school band. I played several brass instruments - including French horn and cornet - as well as keyboards in the jazz stage band. A musician and a nerd, what can I say? I even dabbled in writing music for the band. Okay, mostly I wrote arrangements of pop music, so the band could keep the crowd entertained during Friday night football games. What struck me then was that, to write parts for all the instruments - brass, woodwind, percussion, even k...
Jul. 27, 2016 12:45 AM EDT Reads: 2,247
Internet of @ThingsExpo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with the 19th International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world and ThingsExpo Silicon Valley Call for Papers is now open.
Jul. 26, 2016 11:00 PM EDT Reads: 2,642
SYS-CON Events announced today that Isomorphic Software will exhibit at DevOps Summit at 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Isomorphic Software provides the SmartClient HTML5/AJAX platform, the most advanced technology for building rich, cutting-edge enterprise web applications for desktop and mobile. SmartClient combines the productivity and performance of traditional desktop software with the simp...
Jul. 26, 2016 10:45 PM EDT Reads: 1,130
In his session at @DevOpsSummit at 19th Cloud Expo, Yoseph Reuveni, Director of Software Engineering at Jet.com, will discuss Jet.com's journey into containerizing Microsoft-based technologies like C# and F# into Docker. He will talk about lessons learned and challenges faced, the Mono framework tryout and how they deployed everything into Azure cloud. Yoseph Reuveni is a technology leader with unique experience developing and running high throughput (over 1M tps) distributed systems with extre...
Jul. 26, 2016 08:30 PM EDT Reads: 2,158
Jul. 26, 2016 06:45 PM EDT Reads: 3,907
SYS-CON Events has announced today that Roger Strukhoff has been named conference chair of Cloud Expo and @ThingsExpo 2016 Silicon Valley. The 19th Cloud Expo and 6th @ThingsExpo will take place on November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. "The Internet of Things brings trillions of dollars of opportunity to developers and enterprise IT, no matter how you measure it," stated Roger Strukhoff. "More importantly, it leverages the power of devices and the Interne...
Jul. 26, 2016 05:15 AM EDT Reads: 2,159
This digest provides an overview of good resources that are well worth reading. We’ll be updating this page as new content becomes available, so I suggest you bookmark it. Also, expect more digests to come on different topics that make all of our IT-hearts go boom!
Jul. 26, 2016 12:15 AM EDT Reads: 3,669