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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 2013 East Opening Keynote by IBM
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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.

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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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Cloud Expo was a fantastic event for CSS Corp - we easily exceeded our objectives for engaging with clients and prospects."
AHMAR ABBAS
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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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@CloudExpo Blogs
It seems today we are in a constant state of business and technology disruption. The convergence of the social, mobile, analytics, and cloud (SMAC) disruptions have both forced and enabled organizations to move at breakneck speeds addressing the needs and expectations of the lines of business/end users. This speed requires the development teams to be agile. They must be able to respond quickly to changing needs and demands of the organization. The quality assurance (QA) team still needs to ensure a quality product is being sent into production. Finally, the operations team needs to be able to ...
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OmniTI has expanded its services to help customers automate their processes to deliver high quality applications to market faster. Consistent with its focus on IT agility and quality, OmniTI operates under DevOps principles, exploring the flow of value through the IT delivery process, identifying opportunities to eliminate waste, realign misaligned incentives, and open bottlenecks. OmniTI takes a unique, value-centric approach by plotting each opportunity in an effort-payoff quadrant, then working with customers to focus on initiatives with high payoff and low effort – using its deep bench of...
DevOps is all the rage these days and with good reason as it promises to reduce the time-to-market for new applications. It also promises to improve change management, allowing teams to deploy changes to their applications quickly and efficiently. However, DevOps isn’t something you buy, install, or implement; rather it is the symptom of an appropriate organizational system. In his session at DevOps Summit, Mark Thiele, EVP, Data Center Technologies at SUPERNAP International, will discuss how to get to the right organizational model that will allow DevOps practices to flourish.
In recent years, we’ve watched mobile, cloud technologies and Internet of Things (IoT) enable increased connectivity for every network and every industry, ranging from connected cars to commercial vehicles and fleet management to smart cities to data centers. At MWC, it was clear that professionals in these areas are continuing to make strides in their fields. Below are a few of the major developments we noticed and look forward to hearing more as 2015 progresses.
When it comes to microservices there are myths and uncertainty about the journey ahead. Deploying a “Hello World” app on Docker is a long way from making microservices work in real enterprises with large applications, complex environments and existing organizational structures. February 19, 2015 10:00am PT / 1:00pm ET → 45 Minutes Join our four experts: Special host Gene Kim, Gary Gruver, Randy Shoup and XebiaLabs’ Andrew Phillips as they explore the realities of microservices in today’s IT world:
You deployed an app. Nothing has changed in three days, but it suddenly crashes. Why? Memory leak. You deployed an app. Nothing has changed in three weeks, but it suddenly stops working. Why? A database query came back empty and the web application freaked out trying manipulate a null value, deciding instead to just stop in its track and return nothing. You deployed a load balancing service. Nothing has changed in three months, but it suddenly stopped load balancing your app. Why? One of the ports on an intermediate switch decided to fry. Literally. It's a black hole and the load balancer ...
This month I want to revisit supporting infrastructure and datacenter environments. I have touched (some would say rant) upon this topic since my post in April 2014 called "Take a Holistic View of Support". My thoughts and views on this topic have not changed at all: it's critical for any organization to have a holistic, comprehensive strategy and view of how they support their IT infrastructure and datacenter environments. In fact, I believe it's even more critical today then it was a year ago when I wrote that blog post. We work with many different organizations in many different types of i...
It's spring in the Northeast, and this week we're launching a new blog post series, "Everything You Want to Know about Windows Server 2003 Migration." Why a series of posts on WS2003? Even as summer and EOS is just months away, our "State of Readiness for Windows Server 2003 End of Support" survey reveals the shocking truth: most of you haven't done anything about remediation yet, and most will not complete your upgrades before the deadline.
Microservice architectures are the new hotness, even though they aren't really all that different (in principle) from the paradigm described by SOA (which is dead, or not dead, depending on whom you ask). One of the things this decompositional approach to application architecture does is encourage developers and operations (some might even say DevOps) to re-evaluate scaling strategies. In particular, the notion is forwarded that an application should be built to scale and then infrastructure should assist where necessary.
Keeping data from getting out into the wild or being damaged by cyber attackers is what keeps CISOs, the executive team and boards of directors up at night. To protect organizations, cybersecurity needs to be automated and real-time, it needs to learn contextually like we do and it needs to monitor every corner of the network in a way that organizations can afford without sacrificing coverage.
Even though it’s now Microservices Journal, long-time fans of SOA World Magazine can take comfort in the fact that the URL – soa.sys-con.com – remains unchanged. And that’s no mistake, as microservices are really nothing more than a new and improved take on the Service-Oriented Architecture (SOA) best practices we struggled to hammer out over the last decade. Skeptics, however, might say that this change is nothing more than an exercise in buzzword-hopping. SOA is passé, and now that people are talking about microservices instead, let’s switch out the terminology.
SYS-CON Events announced today the IoT Bootcamp – Jumpstart Your IoT Strategy, being held June 9–10, 2015, in conjunction with 16th Cloud Expo and Internet of @ThingsExpo at the Javits Center in New York City. This is your chance to jumpstart your IoT strategy. Combined with real-world scenarios and use cases, the IoT Bootcamp is not just based on presentations but includes hands-on demos and walkthroughs. We will introduce you to a variety of Do-It-Yourself IoT platforms including Arduino, Raspberry Pi, BeagleBone, Spark and Intel Edison. You will also get an overview of cloud technologies s...
While recently attending a Dynatrace User Group in Hartford, I had the opportunity to sit in on a great presentation from a leading US insurance company as they explained their three-year APM journey. I see a lot of these success stories, but this one was especially impressive. To see how they have refined their internal processes, successes and performance best practices to ensure delivery of high quality, high performing and highly scalable applications over these years. The performance engineering group within the large US insurance company was the one that started adopting application per...
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Past SYS-CON Events
    Cloud Expo West
cloudcomputingexpo
2011west.sys-con.com

 
    Cloud Expo East
cloudcexpo
2011east.sys-con.com

 
    Cloud Expo West
cloudcomputingexpo
2010west.sys-con.com

 
    Virtualization Expo West
virtualization
2010west.sys-con.com
    Cloud Expo Europe
cloudexpoeurope2010.
sys-con.com

 
    Cloud Expo East
cloudcomputingexpo
2010east.sys-con.com

 
    Virtualization Expo East
virtualizationconference
2010east.sys-con.com
    Cloud Expo West
cloudcomputingexpo
2009west.sys-con.com

 
    Virtualization Expo West
virtualizationconference
2009west.sys-con.com
    GovIT Expo
govitexpo.com
 
    Cloud Expo Europe
cloudexpoeurope2009.sys-con.com
 

Cloud Expo 2011 Allstar Conference Faculty

S.F.S.
Dell

Singer
NRO

Pereyra
Oracle

Ryan
OpSource

Butte
PwC

Leone
Oracle

Riley
AWS

Varia
AWS

Lye
Oracle

O'Connor
AppZero

Crandell
RightScale

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