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Service Chaining and Unintended Consequences
Service chaining in a nutshell is basically orchestration of network services

Service chaining is a popular term today to describe a process in the network that's been done in the land of application integration for a long time. Service chaining in a nutshell is basically orchestration of network services. This concept is being put forth as the way future data center networks will be designed and execute in the future.

Its unintended consequence is, of course, that chaining can have a profound impact on performance, particularly when (or if) those chains extend across providers.

Let's consider an existing service chaining example that's challenging for SSL in terms of performance.

The Rest of the "SSL Performance" Story

Now, we're all aware that SSL handshaking introduces latency. It has to because in addition to the already time-consuming process of performing cryptographic functions, it requires additional round trips between the client (browser) and server (or intermediate network proxy acting as the endpoint, such as a load balancer or ADC) to exchange the information needed to encrypt and decrypt subsequent communication.

But that's not all it needs to do. The certificate offered up by the server-side device is increasingly suspect thanks to a variety of incidents in which basically forged certificates were used to impersonate a site and trick the user into believing the site was safe. As the SSL Everywhere movement continues to grow, so has the decision by browsers to properly validate certificates by querying an OCSP (Online Certificate Status Protocol) responder as to the status of the certificate (this is increasingly favored over the use of CRL (Certificate Revocation Lists) to address certain shortcomings of the technology).

What this means is that during the SSL handshake, the client makes a request to an OCSP responder. It's an additional service in the connection chain that adds time to the "load" process. Thus, it needs to be as fast as possible because it's counted in the "load time" for a page, if not technically then from the perspective of the user which, as we all know, is what really counts.

So the browser makes a request to the responder. It does this by choosing a responder from a list of those that support the CA (Certificate Authority, the issuer of the certificate in question). While there are a large number of global CAs, the actual number of global CAs for SSL is fairly small. Thus the responder is almost certainly very large and likely to see billions of requests a day, from around the globe. This "link in the chain" is increasingly important to the overall performance experienced by the end-user. Its impact on mobile users, in particular, is worthy of note given the impact of mobile networks and constrained device capabilities, as noted by Mike Belshe, one of the folks who helped create the SPDY protocol (emphasis mine):

But this process is pretty costly, especially on mobile networks. For my own service, I just did a quick trace over 3G:

  • DNS (1334ms)
  • TCP handshake (240ms)
  • SSL handshake (376ms)
  • Follow certificate chain (1011ms) — server should have bundled this.
  • DNS to CA (300ms)
  • TCP to CA (407ms)
  • OCSP to CA #1 (598ms) — StartSSL CA uses connection close on each!
  • TCP to CA #2 (317ms)
  • OCSP to CA #2 (444ms)
  • Finish SSL handshake (1270ms)

-- Rethinking SSL for Mobile Apps

The emphasized portions of the transaction indicate those related to the certificate verification process being carried out by the browser as a security precaution. Over a non-mobile network, one would expect the performance to improve, but the impact on "regular" browsers should not be underestimated, either. Early last year Adam Langley noted this and proposed to disable OSCP validation in Chrome: .

The median time for a successful OCSP check is ~300ms and the mean is nearly a second. This delays page loading and discourages sites from using HTTPS. They are also a privacy concern because the CA learns the IP address of users and which sites they're visiting.

On this basis, we're currently planning on disabling online revocation checks in a future version of Chrome.

http://www.imperialviolet.org/2012/02/05/crlsets.html

I'll save the security-related arguments for another time, but suffice to say that the impact of service chaining on performance in the case of SSL and certificate validation is significant enough at times to be noticed.

Key Takeaway

Now certainly service chaining in other contexts, say in the data center network, would not experience the same magnitude of delay based purely on the fact that we're talking about LAN speeds rather than what often end up being inter- or cross-continental communications. Still, the very real impact of service chaining, particularly when such chains are comprised of a long string of services, should not be ignored or underestimated. Such chains introduce  additional latency, often in the form of unnecessary, duplicated functions as well as the possibility of failure. Load and utilization monitoring and scaling strategies of individual (dependent) services is a vital to the overall success of any architecture which employs an orchestrated (chained) services strategy.

And while technologies like SDN and cloud offer corrective action in the face of failure, it should be noted that such corrections tend to be reactions to failure. That means at least one user experiences a failure before a correction is made. In some cases that failure will go unnoticed except for a lengthier response time, but the key takeaway there is that it is noticeable.

And when it comes to web application performance, noticeable degradations are not something the business or operations, for that matter, likes to see. Not even for a single user.

Read the original blog entry...

About Lori MacVittie
Lori MacVittie is responsible for education and evangelism of application services available across F5’s entire product suite. Her role includes authorship of technical materials and participation in a number of community-based forums and industry standards organizations, among other efforts. MacVittie has extensive programming experience as an application architect, as well as network and systems development and administration expertise. Prior to joining F5, MacVittie was an award-winning Senior Technology Editor at Network Computing Magazine, where she conducted product research and evaluation focused on integration with application and network architectures, and authored articles on a variety of topics aimed at IT professionals. Her most recent area of focus included SOA-related products and architectures. She holds a B.S. in Information and Computing Science from the University of Wisconsin at Green Bay, and an M.S. in Computer Science from Nova Southeastern University.

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Cloud Expo - Cloud Looms Large on SYS-CON.TV


Cloud Expo 2013 East Opening Keynote by IBM
In this Cloud Expo Keynote, Danny Sabbah, CTO & General Manager, Next Generation Platform, will detail the critical architectural considerations and success factors organizations must internalize to successfully implement, optimize and innovate using next generation architectures.
Lisa Larson, Vice President of Enterprise Cloud Solutions of Rackspace Hosting Live From New York City
In the old world of IT, if you didn't have hardware capacity or the budget to buy more, your project was dead in the water. Budget constraints can leave some of the best, most creative and most ingenious innovations on the cutting room floor. It's a true dilemma for developers and innovators – why spend the time creating, when a project could be abandoned in a blink? That was the old world. In the new world of IT, developers rule. They have access to resources they can spin up instantly. A hybrid cloud ignites innovation and empowers developers to focus on what they need. A hybrid cloud blends the best of all worlds, public cloud, private cloud and dedicated servers to fit the needs of developers and offer the ideal environment for each app and workload without the constraints of a one-size-fits-all cloud.

Keynote: Driving Cloud Innovation: SSDs Change Cloud Storage Paradigm
Cloud is a transformational shift in computing that can have a powerful effect on enterprise IT when designed correctly and used to its full potential. Join Citrix in a discussion that centers on building, connecting and empowering users with cloud services and hear examples of how enterprises are solving real-world business challenges with an architecture and solution purpose-built for the cloud.

Go Beyond IaaS to Deliver "Anything As a Service"
Many organizations want to expand upon the IaaS foundation to deliver cloud services in all forms—software, mobility, infrastructure and IT. Understanding the strategy, planning process and tools for this transformation will help catalyze changes in the way the business operates and deliver real value. Join us to learn about the new ITaaS model and how to begin the transformation.


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Digital Transformation is the ultimate goal of cloud computing and related initiatives. The phrase is certainly not a precise one, and as subject to hand-waving and distortion as any high-falutin' terminology in the world of information technology. Yet it is an excellent choice of words to describe what enterprise IT—and by extension, organizations in general—should be working to achieve. Digital Transformation means: handling all the data types being found and created in the organizat...
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The Internet of Everything (IoE) brings together people, process, data and things to make networked connections more relevant and valuable than ever before – transforming information into knowledge and knowledge into wisdom. IoE creates new capabilities, richer experiences, and unprecedented opportunities to improve business and government operations, decision making and mission support capabilities.
Growth hacking is common for startups to make unheard-of progress in building their business. Career Hacks can help Geek Girls and those who support them (yes, that's you too, Dad!) to excel in this typically male-dominated world. Get ready to learn the facts: Is there a bias against women in the tech / developer communities? Why are women 50% of the workforce, but hold only 24% of the STEM or IT positions? Some beginnings of what to do about it! In her Opening Keynote at 16th Cloud Expo, S...
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Top Stories for Cloud Expo 2012 East

... (more)

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There is little doubt that Big Data solutions will have an increasing role in the Enterprise IT mainstream over time. Get a jump on that rapidly evolving trend at Big Data Expo, which we are introducing in June at
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Testimonials
Cloud Expo was a fantastic event for CSS Corp - we easily exceeded our objectives for engaging with clients and prospects."
AHMAR ABBAS
SVP, Global Infrastructure Management, CSS Corp.
 
With our launch at Cloud Expo, we successfully transformed the company from a relatively unknown European player into the dominant player in the market. Our competitors were taken by surprise and just blown away. We got a huge number of really high quality leads..."
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CEO, Abiquo
 
We were extremely pleased with Cloud Expo this year - I’d say it exceeded expectations all around. This is the same info we got from partners who attended as well. Nice job!"
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@CloudExpo Blogs
Cloud Migration Management (CMM) refers to the best practices for planning and managing migration of IT systems from a legacy platform to a Cloud Provider through a combination professional services consulting and software tools. A Cloud migration project can be a relatively simple exercise, where applications are migrated ‘as is’, to gain benefits such as elastic capacity and utility pricing, but without making any changes to the application architecture, software development methods or business processes it is used for.
National Savings Bank in Malaysia has implemented a sweeping enterprise content management system project and slashed paper use, increased productivity, rationalized storage and documents, and cut security risks, while adhering to compliance requirements.
Microsoft has announced the long-awaited launch of Windows 10, scheduled to be the iconic platform’s last numbered version. By all estimations, Windows 10 will give modern IT users everything they want, wherever and whenever they need it. The one operating system, on the surface at least, addresses all kinds of devices – from PCs and smartphones to even game consoles. For Microsoft, Windows 10 is not just another update; it promises a wholly new user experience. Seamlessness is an important theme to recognize, a vital force in an era when employees demand more flexibility in working environme...
It’s time to talk more vociferously about open data. A better headline for this piece would be: why open data is not an overnight sensation or indeed a turn of a dial or a flick of a switch, i.e., it is not something automatically achieved without some kind of longer term strategic drive, which, in itself, typically needs to be driven by a defined longer term strategic need.
We Need a Holistic Network Infrastructure: Why Controllers Are Not Cutting It For years, we've relied too heavily on individual network functions or simplistic cloud controllers. However, they are no longer enough for today's modern cloud data center. Businesses need a comprehensive platform architecture in order to deliver a complete networking suite for IoT environment based on OpenStack. In his session at @ThingsExpo, Dhiraj Sehgal from PLUMgrid discussed what a holistic networking solution should really entail, and how to build a complete platform that is scalable, secure, agile and auto...
With worldwide spending on cloud services and infrastructure growing by 23% in 2015 to $118B, it is clear that cloud services are here to stay. Yet, the rate of cloud adoption varies by companies and markets around the world. With thousands of outages and hijacks across the Internet every day, one reason for hesitation is the faith in quality Internet performance. In his session at 16th Cloud Expo, Michael Kane, Senior Manager at Dyn, explored how Internet performance affects your end-user’s experience and how you can make variations in the Internet work to your competitive advantage.
It’s not hard to feel sorry for Chief Information Officers (CIOs) – the levels at which they need to operate change all the time… and depth and granularity of the dataflows that present themselves change all the time. Just when we thought we had the whole client-server model worked out, along came the Internet and cloud and the data center.
Unless you fully automate infrastructure and platform provisioning, application build, test and deployment phases and have them working together in sequence, you can’t realize the ideal of continuous delivery. These ‘automation tool chains’ are a mandatory element of each DevOps environment. The number of manual activities in the application test and release processes can cause a downstream bottleneck. Changes pile up at the end of development and unit test activities in agile development environments like SCRUM or Kanban, therefore rendering them less effective. Automation tool chains signif...
User expectations and rethinking of business productivity are having a profound impact on how business applications are used, designed, and leveraged to help buyers, sellers, and employees do their jobs better.
What if, during a snow emergency, an on-the-ground sensor could automatically trigger a relevant emergency notification related to snowfall and road impact. And then, after it’s triggered, that notification is delivered intelligently to individuals based on an extensive set of rules designed to alert the most available and capable responders. This “what if” question about “smart highways” is short-sighted. We are already there, and we are only getting started. While mainstream attention is paid to machine-to-machine communications, new technologies are being developed to make these communica...
"PLUMgrid is a software defined networking company - we provide virtual network infrastructure which plugs into any framework you're using," explained Dhiraj Sehgal of PLUMgrid in this SYS-CON.tv interview at Cloud Expo (http://www.CloudComputingExpo.com), held June 9-11, 2015, at the Javits Center in New York City.
As organizations realize the scope of the Internet of Things, gaining key insights from Big Data, through the use of advanced analytics, becomes crucial. However, IoT also creates the need for petabyte scale storage of data from millions of devices. A new type of Storage is required which seamlessly integrates robust data analytics with massive scale. These storage systems will act as “smart systems” provide in-place analytics that speed discovery and enable businesses to quickly derive meaningful and actionable insights. In his session at @ThingsExpo, Paul Turner, Chief Marketing Officer at...
Full 360 uses big data and analytics to improve their applications support services for the financial industry -- and beyond.
When moving towards a cloud environment, organizations – both large and small – have a lot of choices to make. There are a lot of vendors out there who are “capable” of hosting information, websites or other workloads directly in the cloud. However, remember that not all cloud providers are created equally. Cloud providers are able to offer more and more services as they grow their own underlying infrastructure. As an organization, you have the option of selecting the right partner with the right set of tools to support your business and its growth.
You often hear the two titles of "DevOps" and "Immutable Infrastructure" used independently. In his session at DevOps Summit, John Willis, Technical Evangelist for Docker, covered the union between the two topics and why this is important. He provided an overview of Immutable Infrastructure then showed how an Immutable Continuous Delivery pipeline can be applied as a best practice for "DevOps." He ended the session with some interesting case study examples.
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Nucci
Dell Boomi

Hillier
CiRBA

Morrison
Layer 7 Tech

Robbins
NYT

Schwarz
Oracle

What The Enterprise IT World Says About Cloud Expo
 
"We had extremely positive feedback from both customers and prospects that attended the show and saw live demos of NaviSite's enterprise cloud based services."
  –William Toll
Sr. Director, Marketing & Strategic Alliances
Navisite
 


 
"More and better leads than ever expected! I have 4-6 follow ups personally."
  –Richard Wellner
Chief Scientist
Univa UD
 


 
"Good crowd, good questions. The event looked very successful."
  –Simon Crosby
CTO
Citrix Systems
 


 
"It's the largest cloud computing conference I've ever seen."
  –David Linthicum
CTO
Brick Group