Welcome!

Microservices Expo Authors: Liz McMillan, Elizabeth White, Pat Romanski, Automic Blog, Mamoon Yunus

Related Topics: Microservices Expo, @CloudExpo, @DevOpsSummit

Microservices Expo: Blog Feed Post

Microservices, Service Registries, and Architectural Debt | @DevOpsSummit #DevOps #Microservices

Microservices is not just a style of application development, it’s a set of design principles

Microservices is not just a style of application development, it’s a set of design principles guiding how applications are composed (or decomposed, as the case may be) with a resulting architectural shift as supporting components are added to the mix. Much in the same way SOA brought us UDDI registries and gateways, microservices is bringing service registries.

Service registries, for the uninitiated, are kind of like the internal DNS of a microservices environment. They’re needed to manage the rapid association and disassociation with IP addresses of the containers in which the microservices are typically (but not always) hosted. The average lifespan of a container is measured in minutes or hours, perhaps a day or two, but rarely weeks, months, and probably never years. That means a state of nearly constant change with respect to the infrastructure supporting those services, like the network and app services.

The service registry is responsible for managing that change; it’s where IP addresses and service instances are matched up and handed out to clients (in a client-side architectural pattern) or load balancers (in a server-side architectural pattern). It’s maintained through automation; manual methods of managing the change would simply be too slow and expensive in an environment where new mappings might occur by the minute, hour, or even on a daily basis.

It is here that we return to the imperative that is managing architectural debt. While you can’t eliminate it any more than you can eliminate the technical debt incurred by choices at the code layer, you can manage and try to minimize it. Careful attention to how these new, supporting components are selected and implemented is critical to that endeavor. Each option (client-side, server-side) brings with it a certain amount of architectural debt that will need to be paid in the future.

Introduction of an external service registry necessarily introduces a dependency that cannot be ignored. With a client-side registry, the client is tightly coupled to the registry. Code in the app is required to maintain that dependency and thus impacts the overall development lifecycle. With both patterns, the application will not be able to function without the service registry. This is because without it there’s no way to properly direct the client to an instance of the microservice for processing. Like DNS, the service registry is the glue that loosely binds clients and the “app”.

Thus additional precautions may be required to ensure availability of the service registry, such as the deployment of a high availability (HA) architecture. Because an HA architecture relies on redundancy, this means there must be at least two service registry instances running. This can further complicate the server-side architecture because both instances must be updated whenever an instance is launched or terminated.architectural debt service registries

This is architectural debt, in which choices made require specific architectures that must be maintained over time and incur operational overhead, and is often difficult to change in the future.  This is increasingly true as app-centric (affine) services like load balancing migrate into the application architecture rather than simply co-existing “nearby” in the network. As these critical services (scale is inarguably critical today) are integrated into operational systems that are code-driven, automated, and orchestrated they become as vulnerable to incurring debt as any other code-bound counterpart. Simply shifting from an external server-side service registry to the use of the load balancer’s innate ability to act as a service registry requires payment of the architectural debt incurred from the original decision and further, in an automated, software-driven environment, also requires payment of the technical debt you incurred to integrate with the external service registry. .

It’s important to remember that microservices impacts not just development, but deployment, too, and the architectures required to support delivering their services to the users (people, things, and apps). This is not as simple a change as migrating from Apache to IIS (or vice versa). It’s a disruptive change to the architecture, and that will necessitate a certain amount of architectural debt stemming from the choices you make early on in the adoption cycle.

Architectural debt can be minimized, but not mitigated entirely. Therefore it’s important to start evaluating options now, before hasty decisions are made that will later be regretted or cause unforeseen costs or complications.

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.

@MicroservicesExpo Stories
@DevOpsSummit at Cloud Expo taking place Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center, Santa Clara, CA, is co-located with the 21st 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 ...
With Cloud Foundry you can easily deploy and use apps utilizing websocket technology, but not everybody realizes that scaling them out is not that trivial. In his session at 21st Cloud Expo, Roman Swoszowski, CTO and VP, Cloud Foundry Services, at Grape Up, will show you an example of how to deal with this issue. He will demonstrate a cloud-native Spring Boot app running in Cloud Foundry and communicating with clients over websocket protocol that can be easily scaled horizontally and coordinate...
Docker is on a roll. In the last few years, this container management service has become immensely popular in development, especially given the great fit with agile-based projects and continuous delivery. In this article, I want to take a brief look at how you can use Docker to accelerate and streamline the software development lifecycle (SDLC) process.
DevOps at Cloud Expo, taking place October 31 - November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 21st 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 w...
In his session at 20th Cloud Expo, Scott Davis, CTO of Embotics, discussed how automation can provide the dynamic management required to cost-effectively deliver microservices and container solutions at scale. He also discussed how flexible automation is the key to effectively bridging and seamlessly coordinating both IT and developer needs for component orchestration across disparate clouds – an increasingly important requirement at today’s multi-cloud enterprise.
IT organizations are moving to the cloud in hopes to approve efficiency, increase agility and save money. Migrating workloads might seem like a simple task, but what many businesses don’t realize is that application migration criteria differs across organizations, making it difficult for architects to arrive at an accurate TCO number. In his session at 21st Cloud Expo, Joe Kinsella, CTO of CloudHealth Technologies, will offer a systematic approach to understanding the TCO of a cloud application...
API Security has finally entered our security zeitgeist. OWASP Top 10 2017 - RC1 recognized API Security as a first class citizen by adding it as number 10, or A-10 on its list of web application vulnerabilities. We believe this is just the start. The attack surface area offered by API is orders or magnitude larger than any other attack surface area. Consider the fact the APIs expose cloud services, internal databases, application and even legacy mainframes over the internet. What could go wrong...
The goal of Continuous Testing is to shift testing left to find defects earlier and release software faster. This can be achieved by integrating a set of open source functional and performance testing tools in the early stages of your software delivery lifecycle. There is one process that binds all application delivery stages together into one well-orchestrated machine: Continuous Testing. Continuous Testing is the conveyer belt between the Software Factory and production stages. Artifacts are m...
In IT, we sometimes coin terms for things before we know exactly what they are and how they’ll be used. The resulting terms may capture a common set of aspirations and goals – as “cloud” did broadly for on-demand, self-service, and flexible computing. But such a term can also lump together diverse and even competing practices, technologies, and priorities to the point where important distinctions are glossed over and lost.
In his session at @DevOpsSummit at 20th Cloud Expo, Kelly Looney, director of DevOps consulting for Skytap, showed how an incremental approach to introducing containers into complex, distributed applications results in modernization with less risk and more reward. He also shared the story of how Skytap used Docker to get out of the business of managing infrastructure, and into the business of delivering innovation and business value. Attendees learned how up-front planning allows for a clean sep...
Most companies are adopting or evaluating container technology - Docker in particular - to speed up application deployment, drive down cost, ease management and make application delivery more flexible overall. As with most new architectures, this dream takes a lot of work to become a reality. Even when you do get your application componentized enough and packaged properly, there are still challenges for DevOps teams to making the shift to continuous delivery and achieving that reduction in cost ...
Enterprise architects are increasingly adopting multi-cloud strategies as they seek to utilize existing data center assets, leverage the advantages of cloud computing and avoid cloud vendor lock-in. This requires a globally aware traffic management strategy that can monitor infrastructure health across data centers and end-user experience globally, while responding to control changes and system specification at the speed of today’s DevOps teams. In his session at 20th Cloud Expo, Josh Gray, Chie...
"At the keynote this morning we spoke about the value proposition of Nutanix, of having a DevOps culture and a mindset, and the business outcomes of achieving agility and scale, which everybody here is trying to accomplish," noted Mark Lavi, DevOps Solution Architect at Nutanix, in this SYS-CON.tv interview at @DevOpsSummit at 20th Cloud Expo, held June 6-8, 2017, at the Javits Center in New York City, NY.
We have already established the importance of APIs in today’s digital world (read about it here). With APIs playing such an important role in keeping us connected, it’s necessary to maintain the API’s performance as well as availability. There are multiple aspects to consider when monitoring APIs, from integration to performance issues, therefore a general monitoring strategy that only accounts for up-time is not ideal.
Web services have taken the development world by storm, especially in recent years as they've become more and more widely adopted. There are naturally many reasons for this, but first, let's understand what exactly a web service is. The World Wide Web Consortium (W3C) defines "web of services" as "message-based design frequently found on the Web and in enterprise software". Basically, a web service is a method of sending a message between two devices through a network. In practical terms, this ...
In his session at 20th Cloud Expo, Mike Johnston, an infrastructure engineer at Supergiant.io, discussed how to use Kubernetes to set up a SaaS infrastructure for your business. Mike Johnston is an infrastructure engineer at Supergiant.io with over 12 years of experience designing, deploying, and maintaining server and workstation infrastructure at all scales. He has experience with brick and mortar data centers as well as cloud providers like Digital Ocean, Amazon Web Services, and Rackspace. H...
All organizations that did not originate this moment have a pre-existing culture as well as legacy technology and processes that can be more or less amenable to DevOps implementation. That organizational culture is influenced by the personalities and management styles of Executive Management, the wider culture in which the organization is situated, and the personalities of key team members at all levels of the organization. This culture and entrenched interests usually throw a wrench in the work...
When you focus on a journey from up-close, you look at your own technical and cultural history and how you changed it for the benefit of the customer. This was our starting point: too many integration issues, 13 SWP days and very long cycles. It was evident that in this fast-paced industry we could no longer afford this reality. We needed something that would take us beyond reducing the development lifecycles, CI and Agile methodologies. We made a fundamental difference, even changed our culture...
As many know, the first generation of Cloud Management Platform (CMP) solutions were designed for managing virtual infrastructure (IaaS) and traditional applications. But that’s no longer enough to satisfy evolving and complex business requirements. In his session at 21st Cloud Expo, Scott Davis, Embotics CTO, will explore how next-generation CMPs ensure organizations can manage cloud-native and microservice-based application architectures, while also facilitating agile DevOps methodology. He wi...
We have Continuous Integration and we have Continuous Deployment, but what’s continuous across all of what we do is people. Even when tasks are automated, someone wrote the automation. So, Jayne Groll evangelizes about Continuous Everyone. Jayne is the CEO of the DevOps Institute and the author of Agile Service Management Guide. She talked about Continuous Everyone at the 2016 All Day DevOps conference. She describes it as "about people, culture, and collaboration mapped into your value streams....