Practitioners in nearly every technology field are facing revolutionary changes in the way systems and networks are built. Change, by itself, really isn't all that interesting. Those among us who have been doing this a while will recognize that technological change is one of the few reliable constants. What is interesting, however, is how things are changing.
Architects, engineers, and the vendors that produce gear for them have simply fallen in love with the concept of abstraction. The abstraction flood gates have metaphorically flown open following the meteoric rise of the virtual machine in enterprise networks. As an industry, we have watched the abstraction of the operating system -- from the hardware it lives on -- give us an amazing amount of flexibility in the way we deploy and manage our systems. Now that the industry has fully embraced the concept of abstraction, we aim to implement it everywhere.
Breaking away from monolithic stack architecture
If we take a look at systems specifically, it used to be that the hardware, the operating system, and the application all existed as one logical entity. If it was a large application, we might have components of the application split out across multiple hardware/OS combos, but generally speaking the stack was a unit. That single unit was something we could easily recognize and monitor as a whole. SNMP, while it has its limitations, has done a decent job of allowing operators to query the state of everything in that single stack.
Virtualization changed the game a bit as we decoupled the OS/Application from the hardware. While it may not have been the most efficient way of doing it, we could still monitor the VM like we used to when it was coupled with the hardware. This is because we hadn't really changed the architecture. Abstraction gave us some significant flexibility but our applications still relied on the same components, arranged in a similar pattern to the bare-metal stacks we started with. The difference is that we now had two unique units where information collection was required, the hardware remained as it always had and the OS/Application became a secondary monitoring target. It took a little more configuration but it didn't change the nature of the way we monitored the systems.
Cloud architecture changes everything
Then came the concept of cloud infrastructure. With it, developers began embracing the elastic nature of the cloud and started building their products to take advantage of it. Rather than sizing an application stack based off of guesstimates of the anticipated peak load, it can now be sized minimally and scaled out horizontally when needed by adding additional instances. Previously, just a handful of systems would have handled peak loads. Now those numbers could be dozens, or even hundreds of dynamically built systems scaled out based on demand. As the industry moves in this direction, our traditional means of monitoring simply do not provide enough information to let us know if our application is performing as expected.
The networking story is similar in a lot of ways. While networking has generally been resistant to change over the past couple of decades, the need for dynamic/elastic infrastructure is forcing networks to take several evolutionary steps rather quickly. In order to support the cloud models that application developers have embraced, the networks of tomorrow will be built with application awareness, self-programmability, and moment-in-time best path selection as core components.
Much like in the systems world, abstraction is one of the primary keys to achieving this flexibility. Whether the new model of networks is built upon new protocols, or overlays of existing infrastructure, the traditional way of statically configuring networks is coming to an end. Rather than having statically assigned primary, secondary, and tertiary paths, networks will balance traffic based off of business policy, link performance, and application awareness. Fault awareness will be built in, and traffic flows will be dynamically routed around trouble points in the network. Knowing the status of the actual links themselves will become less important, much like physical hardware that applications use. Understanding network performance will require understanding the actual performance of the packet flows that are utilizing the infrastructure.
At the heart of the matter, the end goal appears to be ephemeral state of both network path selection as well as systems architecture.
So how does this change monitoring?
Abstraction inherently makes application and network performance harder to analyze. In the past, we could monitor hardware state, network link performance, CPU, memory, disk latency, logs, etc. and come up with a fairly accurate picture of what was going on with the applications using those resources. Distributed architectures negate the correlation between a single piece of underlying infrastructure and the applications that use it. Instead, synthetic application transactions and real-time performance data will need to be used to determine what application performance really looks like. Telemetry is a necessary component for monitoring next generation system and network architectures.
Does this mean that SNMP is going away?
While many practitioners wouldn't exactly shed a tear if they never needed to touch SNMP again, the answer is no. We still will have a need to monitor the underlying infrastructure even though it no longer gives us the holistic view that it once did. The widespread use of SNMP as the mechanism for monitoring infrastructure means it will remain a component of monitoring strategies for some time to come. Next generation monitoring systems will need to integrate the traditional SNMP methodologies with deeper levels of real-time application testing and awareness to ensure operators can remain aware of the environments they are responsible for managing.
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