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Why is Kubernetes getting so popular?

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Re: Why is Kubernetes getting so popular?

#371

Post by pnako »

jjjensen90 wrote: post #356
nihil75 wrote: post #144

Earlier quoted context omitted.

IaaS is not "the cloud". it was in 2008 when all we had was EC2 and RDS. Today Kubernetes is the antithesis of the cloud - Instead of consuming resources on demand you're launching VMs that need to run 24/7 and have specific roles and names like "master-1". Might as well rent bare-metal servers. It will cost you less.

You are completely wrong. It is trivial to have your k8s control plane and your workload cluster in something like an ASG, and basically know nothing about the nodes in either group. I'm not even using GKS or EKS, just ASGs on AWS. My servers and applications are cattle, not pets. I knew literally nothing about k8s in September and now I have multiple clusters humming along, treating the worker cluster nodes as a gen…

I don't have a horse in this nonsense but I find it hilarious that even users of Kubeanraenet have some trouble defining what it even is.

Re: Why is Kubernetes getting so popular?

#372

Post by snuxoll »

falcolas wrote: post #330
roman_sf wrote: post #327

Earlier quoted context omitted.

good thing kubernetes can restart pods fast and have persistent volumes!

Persistant volumes rely on NFS (or a flavor thereof), which is not great for database performance. But that's a moot point anyways, since Vitess doesn't use persistent volumes - it reloads the individual DBs from backups and binlogs when a pod is moved or restarted.

> Persistant volumes rely on NFS (or a flavor thereof), which is not great for database performance.

NFS is an option, but it’s not the only option. If you need locally attached storage you can use local PV’s which went GA in Kubernetes 1.14, or any of the plethora of volume plugins that exist for various network storage solutions.

Re: Why is Kubernetes getting so popular?

#373

Post by jsjohnst »

falcolas wrote: post #323
hyperbovine wrote: post #296

Earlier quoted context omitted.

> I'll never forget when I joined a hip fintech company, and the director of eng told us in orientation that we should think of their cloud of services as a thousand points of light Let's be real, if you are old enough to get that reference without Googling, you probably would not have lasted that long at a hip fintech company anyways :-P

George Sr's term wasn't that long ago. ... was it?

32 years ago, so I dunno, is that “long ago” to you?

Re: Why is Kubernetes getting so popular?

#374

Post by verdverm »

kronin wrote: post #347
yongjik wrote: post #328

Earlier quoted context omitted.

This is getting off-topic, but I didn't understand the rationale behind that. Processes running inside docker/k8s are already isolated, so unless you're running something potentially malicious, why would it matter if it's root or not? (Of course, if you're running untrusted user code, then you'll need every protection you can muster, but I'm talking about running an internally developed application. If you can't trus…

If the container is running as root, and you escape the container, you are root on the host. Containers share the kernel with the host, and are only as isolated as the uid the process in the container runs as and the privileges you grant that container.

He doesn't seem to understand the new landscape well enough to make his comparisons.

The point about AWS was not a Kubernetes comparison. It was a GCP one, because you asked what was wrong with the God aweful AWS

Re: Why is Kubernetes getting so popular?

#375

Post by snuxoll »

marktolson wrote: post #355
ransom1538 wrote: post #278

Earlier quoted context omitted.

Just running docker-compose on load balanced machines is pretty close to having all k8s features (that would give you an endpoint, scaling, running pods[containers],heartbeats and nodes[vms]). If you run Kubernetes on GCP you will see it's just a wrapper of GCP vms, load balancers, instance groups and disks. EG: GCP k8's autoscaling for the nodes isn't any better than just simple GCP load balancers and instance group…

We edit yaml files everytime we update a service version, which happens multiple times per week? Is there a better way to deal with this?

Integrate it with your CI/CD pipeline. I have a Gitlab pipeline that runs kustomize and pipes the output to kubectl for every deploy to do things like setting secrets, image tags, creating ConfigMaps from config files in the repository, etc.

Re: Why is Kubernetes getting so popular?

#376

Post by closeparen »

archsurface wrote: post #148
silviogutierrez wrote: post #4

For me, and many others: infrastructure as code. Kubernetes is very complex and took a long time to learn properly. And there have been fires among the way. I plan to write extensively on my blog about it. But at the end of the day: having my entire application stack as YAML files, fully reproducible [1] is invaluable. Even cron jobs. Note: I don't use micro services, service meshes, or any fancy stuff. Just a plain…

I'm not sure "a plain ol' Django monolith" with none of the "fancy stuff" is either what people are referring to when they say "kubernetes", or a great choice for that. I could run hello world on a Cray but that doesn't mean I can say I do supercomputing. Our team does use it for all the fancy stuff, and spends all day everyday for years now yamling, terraforming, salting, etc so theoretically our setup is "entire ap…

>but if it fell apart tomorrow, I'd run for the hills

The test is going from zero to production traffic in a new cloud region.

Re: Why is Kubernetes getting so popular?

#377

Post by verdverm »

pixelmonkey wrote: post #350
ForHackernews wrote: post #142

Earlier quoted context omitted.

That's exactly the point. You avoid lock-in to AWS or GCP by running on K8S instead. K8S becomes the "operating system": a standardized abstraction over different hardware.

Isn’t a “standardized abstraction over different hardware” just... an actual operating system? Isn’t “the operating system of the cloud” just... the actual operating system running on your cloud VMs? If you script a deployment environment atop vanilla Linux distros (e.g. ansible), you also avoid public cloud lock-in. (Side benefit: you also avoid container engine lock-in, and container layer complexity!) Containers a…

Kubernetes, when viewed as the OS for the data center, controls, manages, and allocates a pool of shared resources. When I install and run an application on my laptop, there are a ton of details I don't care about that just happen magically. Kubernetes maps this idea onto the resources and applications of the cloud.

Again, Kubernetes is far more than just deploying, running, mad scaling an application. It allows so many problems to be solved at the system level, outside of an application and developers awareness.

Take for example restricting base images at your organization. With Kubernetes, SecOps can install an application which scans all incoming jobs and either rejects them, or in more sophisticated setups, hot swaps the base image

Re: Why is Kubernetes getting so popular?

#379

Post by verdverm »

Aeolun wrote: post #321
shiftpgdn wrote: post #233

Earlier quoted context omitted.

AWS console is very carefully designed to let you create traps that result in spending huge buckets of money if you're not paying attention.

EC2 instances are fairly predictable.

And when they fail (especially when the underlying hardware fails... Does AWS live migrate your workloads with zero downtime like Google?

Re: Why is Kubernetes getting so popular?

#380

Post by verdverm »

Aeolun wrote: post #333
kelnos wrote: post #136

Earlier quoted context omitted.

I think the point is that there are people that claim that k8s adds a ton of complexity to your environment. But if you compare k8s alone with managing your infrastructure using (non-k8s) AWS or GCP primitives, you'll find that the complexity is similar.

The problem is that what the nodes in AWS are doing is fairly transparent. When my kubernetes pod does not come up, it’s always a hell of a pain figuring out why from just the events that kubernetes is giving me.

Sounds like you need better logmon or more practice. Debugging apps is so much easier on k8s.
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