Cloud orchestration, Container Orchestration, Kubernetes... I think I am getting old and starting to understand how my parents feel about technology. I am developer, but mostly work on desktop apps, or embedded devices or lataly on some MVC applications. But reading things like "A Container-Native Stack for Modern Applications and Operations Increase development velocity while simplifying operations." I have no idea…
So, you build a web app and it gets popular. It needs one load balancer, 5 app servers, at least two database nodes for replication, a redis cluster for caching and queuing, an elasticsearch cluster for full text search, and a cluster of job worker servers to do async stuff like processing images, etc. In the ancient past, like when I'm from, you'd write up a few different bash scripts to help you provision each serv…
Now, think about it from a reductionistic engineering perspective. What do I really want this server to do? Well, it accepts TCP connections, parses a request to figure out which file (at the time, it was all files) to server, sticks an HTTP header on the file, and shoves it down the socket.
This task is so simple that a skilled network programmer can nowadays literally bash together a 1990s-level static HTTP server in an day, with nothing but a socket library and some basic string handling. (It may not be great and it probably is insecure, but, well... see also "1990s web server"....) The code to do this is perhaps in the dozens or hundreds of kilobytes.
But that's not what I had. I have a full computer that physically needs to live somewhere. It has hardware ethernet and hardware graphics cards and a physical monitor and a power supply and RAM and, basically, hardware hardware hardware, the failure of any one of which means the system is either difficult to change or outright down. I have an entire Windows operating system, which even in the 1990s was hundreds of megabytes of code, endless code. Code for a windowing system, for pete's sake. Code for the audio subsystem. Code for accessing the hard drive. Code for access code that accesses code. Code code code code code, a bug in any one of which means the system may be down or insecure. My website, which at the time was quite likely in single-digit megabytes in size, was a tiny directory lost in a sea of files on the hard drive.
Over the past 20 years, the commodity hardware world [1] has been slicing away at the fact that several dozen kilobytes of code are being accompanied by hundreds of megabytes of support and literal pounds of physical hardware. Hardware went first with VMs. VMs got lighter and lighter. Lightweight hypervisor solutions sliced away at the heaviness of the VM. Containers slice away at the OS. Things like Kubernates slice away at the idea of a container living somewhere physically.
We're trying to free that several dozen kilobytes of code to be just several dozen kilobytes of code, as flexible and easy-to-deploy as several dozen kilobytes should be, if you weren't mired in the world of hardware and OSes and code and strong physical connections.
(Data storage is more complicated, but in a lot of ways, the same principles are in play.)
Operationally, containers are very exciting. However, in terms of "magic technologies I don't understand", I don't think they're worth stressing about "getting old" or anything. It's mostly "just" a big pile of practical considerations in trying to not just build that world, but in some sense also undo decades of grinding-in of the physical world to our operational considerations. If you want worry about getting old and out-of-date, worry about that let you do something that you couldn't before, like GPU programming or deep learning.
[1]: Which must be specified because mainframes beat us all here decades ago, in a lot of ways.