Welcome!

@CloudExpo Authors: Harry Trott, Yeshim Deniz, Rene Buest, Liz McMillan, Carmen Gonzalez

Related Topics: Linux Containers, Agile Computing

Linux Containers: Blog Feed Post

Dear Slashdot: You Get What You Pay For

Open Source SSL Accelerator solution not as cost effective or well-performing as you think

Open Source SSL Accelerator solution not as cost effective or well-performing as you think

o3 Magazine has a write up on building an SSL accelerator out of Open Source components. It's a compelling piece, to be sure, that was picked up by Slashdot and discussed extensively.

If o3 had stuck to its original goal - building an SSL accelerator on the cheap - it might have had better luck making its arguments. But it wanted to compare an Open Source solution to a commercial solution. That makes sense, the author was trying to show value in Open Source and that you don't need to shell out big bucks to achieve similar functionality. The problem is that there are very few - if any - commercial SSL accelerators on the market today. SSL acceleration has long been subsumed by load balancers/application delivery controllers and therefore a direct comparison between o3's Open Source solution and any commercially available solution would have been irrelevant; comparing apples to chicken is a pretty useless thing to do.

To the author's credit, he recognized this and therefore offered a complete Open Source solution that would more fairly be compared to existing commercial load balancers/application delivery controllers, specifically he chose BIG-IP 6900. The hardware platform was chosen, I assume, based on the SSL TPS rates to ensure a more fair comparison. Here's the author's description of the "full" Open Source solution:

The Open Source SSL Accelerator requires a dedicated server running Linux. Which Linux distribution does not matter, Ubuntu Server works just as well as CentOS or Fedora Core. A multi-core or multi-processor system is highly recommended, with an emphasis on processing power and to a lesser degree RAM. This would be a good opportunity to leverage new hardware options such as Solid State Drives for added performance. The only software requirement is Nginx (Engine-X) which is an Open Source web server project. Nginx is designed to handle a large number of transactions per second, and has very well designed I/O subsystem code, which is what gives it a serious advantage over other options such as Lighttpd and Apache. The solution can be extended by combining a balancer such as HAproxy and a cache solution such as Varnish. These could be placed on the Accelerator in the path between the Nginx and the back-end web servers.

o3 specs out this solution as running around $5000, which is less than 10% of the listed cost of a BIG-IP 6900. On the surface, this seems to be quite the deal. Why would you ever purchase a BIG-IP, or any other commercial load balancer/application delivery controller based on the features/price comparison offered?

Turns out there are quite a few reasons; reasons that were completely ignored by the author.

CHAINING PROXIES vs INTEGRATED SOLUTIONS
While all of the moving parts cited by the author (Nginx, Apache, HAproxy, Varnish) are all individually fine solutions, he suggests combining them to assemble a more complete application delivery solution that provides caching, Layer 7 inspection and transformation, and other advanced functionality. Indeed, combining these solutions does provide a deployment that is closer to the features offered by a commercial application delivery controller such as BIG-IP.

Unfortunately, none of these Open Source components are integrated. This necessitates an architecture based on chaining of proxies, regardless of their deployment on the same hardware (as suggested by the author) or on separate devices; in path, of course, but physically separated.

Chaining proxies incurs latency at every point in the process. If you chain proxies, you are going to incur latency in the form of:

  • TCP connection setup and teardown processing
  • Inspection of application data (layer 7 inspection is rarely computationally inexpensive)
  • Execution of functionality (caching, security, acceleration, etc...)
  • Transfer of data between proxies (when deployed on the same device this is minimized)
  • Multiple log files

This network sprawl degrades response time by adding latency at every hop and actually defeats the purposes for which they were deployed. The gains in performance achieved by offloading SSL to Nginx is almost immediately lost when multiple proxies are chained in order to provide the functionality required to match a commercial application delivery controller.

A chained proxy solution adds complexity, obscures visibility (impacts ability to troubleshoot) and makes audit paths more difficult to follow. Aggregated logging never mentioned, but this is a serious consideration, especially where regulatory compliance enters the picture. The issue of multiple log files is one that has long plagued IT departments everywhere, as they often require manual aggregation and correlation - which incurs time and costs. A third party solution is often required to support troubleshooting and transactional monitoring, which incurs additional costs in the form of acquisition, maintenance, and management not considered by the author.

Soft costs, too, are ignored by the author. The configuration of the multiple Open Source intermediaries required to match a commercial solution often require manual editing of configuration files; and must be configured individually. Commercial solutions - and specifically BIG-IP - reduce the time and effort required to configure such solutions by offering myriad options for management - standards-based API, scripting, command line, GUI, application templates and wizards, central management system, and integration as part of other standard data center management systems.

COMPRESSION SHOULD NEVER BE A BINARY CONFIGURATION
The author correctly identifies that offloading compression duties from back-end servers to an intermediary can result in improved performance of the application and greater efficiencies of the servers. NGinx supports industry-standard gzip compression.

The problem with this - and there is a problem - is that it is not always beneficial to apply compression. Years of extensive experience and testing prove that the use of compression can actually degrade performance. Factors such as size of application payload, type of content, and the speed of the network on which the application data will be transferred should all be considered when making the decision to compress or not compress.

This intelligence, this context-awareness, is not offered by this Open Source solution. o3's solution is on or off, with nothing in between. In situations where images are being delivered over a LAN, for example, this will not provide any significant performance benefit and in fact will likely degrade performance. Certainly NGinx could be configured to ignore images, but this does not solve the problem of the inherent uselessness of trying to compress content traversing a LAN and/or under a specific length.

SECURITY
Another overlooked item is security. Not just application security, but full TCP/IP stack security. The Open Source solution could easily add mod_security to the list to achieve parity with the application security features available in commercial solutions. That does not address the underlying stack security. The author suggests running on any standard Linux platform. To be sure, anyone building such a solution for deployment in a production environment will harden the base OS; potentially using SELinux to further lock down the system. No need to argue about this; it's assumed good administrators will harden such solutions.

But what will not be done - and can't be done - is securing the system against network and application attacks. Simple DoS, ARP poisoning, SYN floods, cookie tampering. The potential attacks against a system designed to sit in front of web and application servers are far more lengthy than this, but even these commonly seen attacks will not be addressed by o3's Open Source solution. By comparison, these types of attacks are part and parcel of BIG-IP; no additional modules or functionality necessary.

Furthermore, the performance numbers provided by o3 for their solution seem to indicate that testing was accomplished using 512-bit key certificates.  A single Opteron core can only process around 1500 1024-bit RSA operations per second. This means an 8-core CPU could only perform approximately 12,000 1024-bit RSA ops per second - assuming that's all they were doing. 512-bit keys run around five times faster than 1024-bit. The author states: "The system had no problems handling over 26,590 TPS" which seems to indicate it was not using the industry standard 1024-bit key based on the core capabilities of the processors to process RSA operations. In fact, 512-bit key certificates are no longer supported by most CAs due to their weak key strength.

Needless to say, if the testing used to determine the SSL TPS for BIG-IP were to use 512-bit keys, you'd see a marked increase in the number of SSL TPS in the data sheet.

YOU GET WHAT YOU PAY FOR
Look, o3 has a put together a fairly cool and cheap solution that accomplishes many of the same tasks as a commercial application delivery controller. That's not the point. The point is trying to compare a robust, integrated application delivery solution with a cobbled together set of components designed to mimic similar functionality is silly.

Not only that, the logic that claims it is more cost efficient is flawed.

Is the o3 solution cheaper? Sure- as long as we look only at acquisition. If we look at cost to application performance, to maintain the solution, to troubleshoot, and to manage it then no, no it isn't. You're trading in immediate CAPEX cost savings for long-term OPEX cost outlays.

And as is always the case, in every market, you get what you pay for. A $5000 car isn't going to last as long or perform as well as the $50,000 car, and it isn't going to come with warranties and support, either. It will do what you want, at least for a while, but you're on your own when you take the cheap route.

That said, you are welcome to do so. It is your data center, after all. Just be aware of what you're sacrificing and the potential issues with choosing the road less expensive.

Follow me on Twitter View Lori's profile on SlideShare friendfeedicon_facebook AddThis Feed Button Bookmark and Share

Related blogs and articles:

Technorati Tags: ,,,,,
,,,,,,,,
,,,,,
Categories:  ,  ,  

Read the original blog entry...

More Stories By 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.

@CloudExpo Stories
Addteq is one of the top 10 Platinum Atlassian Experts who specialize in DevOps, custom and continuous integration, automation, plugin development, and consulting for midsize and global firms. Addteq firmly believes that automation is essential for successful software releases. Addteq centers its products and services around this fundamentally unique approach to delivering complete software release management solutions. With a combination of Addteq's services and our extensive list of partners,...
DevOps is being widely accepted (if not fully adopted) as essential in enterprise IT. But as Enterprise DevOps gains maturity, expands scope, and increases velocity, the need for data-driven decisions across teams becomes more acute. DevOps teams in any modern business must wrangle the ‘digital exhaust’ from the delivery toolchain, "pervasive" and "cognitive" computing, APIs and services, mobile devices and applications, the Internet of Things, and now even blockchain.
In 2014, Amazon announced a new form of compute called Lambda. We didn't know it at the time, but this represented a fundamental shift in what we expect from cloud computing. Now, all of the major cloud computing vendors want to take part in this disruptive technology. In his session at 20th Cloud Expo, John Jelinek IV, a web developer at Linux Academy, will discuss why major players like AWS, Microsoft Azure, IBM Bluemix, and Google Cloud Platform are all trying to sidestep VMs and containers...
A strange thing is happening along the way to the Internet of Things, namely far too many devices to work with and manage. It has become clear that we'll need much higher efficiency user experiences that can allow us to more easily and scalably work with the thousands of devices that will soon be in each of our lives. Enter the conversational interface revolution, combining bots we can literally talk with, gesture to, and even direct with our thoughts, with embedded artificial intelligence, whic...
Wooed by the promise of faster innovation, lower TCO, and greater agility, businesses of every shape and size have embraced the cloud at every layer of the IT stack – from apps to file sharing to infrastructure. The typical organization currently uses more than a dozen sanctioned cloud apps and will shift more than half of all workloads to the cloud by 2018. Such cloud investments have delivered measurable benefits. But they’ve also resulted in some unintended side-effects: complexity and risk. ...
WebRTC is the future of browser-to-browser communications, and continues to make inroads into the traditional, difficult, plug-in web communications world. The 6th WebRTC Summit continues our tradition of delivering the latest and greatest presentations within the world of WebRTC. Topics include voice calling, video chat, P2P file sharing, and use cases that have already leveraged the power and convenience of WebRTC.
SYS-CON Events announced today that CA Technologies has been named “Platinum 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, 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. CA Technologies helps customers succeed in a future where every business – from apparel to energy – is being rewritten by software. From ...
With 10 simultaneous tracks, keynotes, general sessions and targeted breakout classes, Cloud Expo and @ThingsExpo are two of the most important technology events of the year. Since its launch over eight years ago, Cloud Expo and @ThingsExpo have presented a rock star faculty as well as showcased hundreds of sponsors and exhibitors! In this blog post, I provide 7 tips on how, as part of our world-class faculty, you can deliver one of the most popular sessions at our events. But before reading the...
"Storage is growing. All of IDC's estimates say that unstructured data is now 80% of the world's data. We provide storage systems that can actually deal with that scale of data - software-defined storage systems," stated Paul Turner, Chief Product and Marketing Officer at Cloudian, in this SYS-CON.tv interview at 17th Cloud Expo, held November 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA.
The best way to leverage your Cloud Expo presence as a sponsor and exhibitor is to plan your news announcements around our events. The press covering Cloud Expo and @ThingsExpo will have access to these releases and will amplify your news announcements. More than two dozen Cloud companies either set deals at our shows or have announced their mergers and acquisitions at Cloud Expo. Product announcements during our show provide your company with the most reach through our targeted audiences.
20th Cloud Expo, taking place June 6-8, 2017, at the Javits Center in New York City, NY, will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud strategy.
Bert Loomis was a visionary. This general session will highlight how Bert Loomis and people like him inspire us to build great things with small inventions. In their general session at 19th Cloud Expo, Harold Hannon, Architect at IBM Bluemix, and Michael O'Neill, Strategic Business Development at Nvidia, discussed the accelerating pace of AI development and how IBM Cloud and NVIDIA are partnering to bring AI capabilities to "every day," on-demand. They also reviewed two "free infrastructure" pr...
Cloud Expo, Inc. has announced today that Aruna Ravichandran, vice president of DevOps Product and Solutions Marketing at CA Technologies, has been named co-conference chair of DevOps at Cloud Expo 2017. The @DevOpsSummit at Cloud Expo New York will take place on June 6-8, 2017, at the Javits Center in New York City, New York, and @DevOpsSummit at Cloud Expo Silicon Valley will take place Oct. 31-Nov. 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
Have you ever noticed how some IT people seem to lead successful, rewarding, and satisfying lives and careers, while others struggle? IT author and speaker Don Crawley uncovered the five principles that successful IT people use to build satisfying lives and careers and he shares them in this fast-paced, thought-provoking webinar. You'll learn the importance of striking a balance with technical skills and people skills, challenge your pre-existing ideas about IT customer service, and gain new in...
In his general session at 18th Cloud Expo, Lee Atchison, Principal Cloud Architect and Advocate at New Relic, discussed cloud as a ‘better data center’ and how it adds new capacity (faster) and improves application availability (redundancy). The cloud is a ‘Dynamic Tool for Dynamic Apps’ and resource allocation is an integral part of your application architecture, so use only the resources you need and allocate /de-allocate resources on the fly.
SYS-CON Events announced today that Hitrons Solutions 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. Hitrons Solutions Inc. is distributor in the North American market for unique products and services of small and medium-size businesses, including cloud services and solutions, SEO marketing platforms, and mobile applications.
@DevOpsSummit at Cloud taking place June 6-8, 2017, at Javits Center, New York City, is co-located with the 20th International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait for long developm...
Almost two-thirds of companies either have or soon will have IoT as the backbone of their business. Though, IoT is far more complex than most firms expected with a majority of IoT projects having failed. How can you not get trapped in the pitfalls? In his session at @ThingsExpo, Tony Shan, Chief IoTologist at Wipro, will introduce a holistic method of IoTification, which is the process of IoTifying the existing technology portfolios and business models to adopt and leverage IoT. He will delve in...
In his session at @ThingsExpo, Steve Wilkes, CTO and founder of Striim, will delve into four enterprise-scale, business-critical case studies where streaming analytics serves as the key to enabling real-time data integration and right-time insights in hybrid cloud, IoT, and fog computing environments. As part of this discussion, he will also present a demo based on its partnership with Fujitsu, highlighting their technologies in a healthcare IoT use-case. The demo showcases the tracking of patie...
DevOps and microservices are permeating software engineering teams broadly, whether these teams are in pure software shops but happen to run a business, such Uber and Airbnb, or in companies that rely heavily on software to run more traditional business, such as financial firms or high-end manufacturers. Microservices and DevOps have created software development and therefore business speed and agility benefits, but they have also created problems; specifically, they have created software securi...