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Kubernetes 1.18

kubernetes.io

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Re: Kubernetes 1.18

#21

Post by jarfil »

outworlder wrote: post #8
taywrobel wrote: post #2

Reminder to everyone that unless you have a truly massive or complex system, you probably don’t need to run K8s, and will save yourself a ton of headaches avoiding it in favor of a more simple system or using a managed option.

Not sure why this disclaimer has to be posted every time there's a discussion on K8s. It is a tool, if you need to use it, do use it. If not, don't. Although I would argue that you need to know what trade offs you are making if you have the right use-case (multiple containers you need to orchestrate, preferably across multiple machines) and you are not using it or a similar tool. There are lots of best-practices and…

You can migrate docker deployments to K8s just by adding the parts you were missing, so when in doubt, it always makes sense to start with docker, docker-compose, and only consider K8s as an alternative to docker swarm.

Re: Kubernetes 1.18

#22

Post by geuis »

threatofrain wrote: post #17

Anyone have a recommended guide for Kubernetes?

I’ve been getting up to speed over the last few months.

Don’t do what I did: googling and going through random top hits. Most of these are 1-off blog articles that revolve around “install Helm and then do these 6 things” or “just kubectl apply random.link.com/some-script”.

Doing that just leads to tons of confusion and anger.

My recommendation: Suck it up and read through the official kubernetes docs. Their docs aren’t written in a way to easily explain core concepts unfortunately. However, slogging through it will give you some initial exposure to concepts and will let you know where to go back to later when your making mental connections.

Next, look for k8s tutorials from Digital Ocean and Linode. In my opinion, they’re the best written guides for demonstrating how to get from A to B.

You’ll start running through those guides and be referencing back to the official docs. Gradually bridges will form on your head and you’ll get an intermediate, functional level of competence.

Re: Kubernetes 1.18

#25

Post by thedance »

threatofrain wrote: post #17

Anyone have a recommended guide for Kubernetes?

There aren't any. Someone should write one. My beef with them all is they start from the top down, taking giant leaps of logic and assuming that everyone has the same use cases and motivations. In my personal opinion, humble though it may not be, the way to understand Kubernetes is from the bottom up. First of all, figure out how Linux starts your process. I've noticed that a lot of people who are afraid of k8s are afraid of it partly because they have no idea how a Linux machine works anyway. So start there. After you've got that figured out, learn about control groups. What kinds of resources can be controlled? How do you create and destroy control groups? How do you put processes in them? Same thing for namespaces. How do they work? What can a process see from its perspective inside a process namespace?

If you grok all that, then you are ready to grok the K8s Container Runtime Interface. And, if you really grokked it, you understand that Docker is besides the point, isolation and namespaces are optional, and so forth. All k8s demands from the "container runtime" is that a thing has a name and a defined lifecycle.

Once you understand how k8s works at the pod and node level then it should be perfectly obvious how it works at higher levels. That's why I really want to see someone write the bottom-up guide!

Re: Kubernetes 1.18

#27

Post by stevepike »

threatofrain wrote: post #17

Anyone have a recommended guide for Kubernetes?

I don't know if it's updated for more recent versions, but I read "Kubernetes: Up and running" last year and it was excellent. It covers the motivations behind some of the decisions which helped things click for me.

Re: Kubernetes 1.18

#28

Post by thedance »

gbrayut wrote: post #26
threatofrain wrote: post #17

Anyone have a recommended guide for Kubernetes?

Kubernetes Deconstructed video https://vimeo.com/245778144/4d1d597c5e

I had to ragequit in the third minute. "A container is the filesystem inside your application." Just, no.

This is exactly the kind of word salad approach to explaining k8s that I complained about in my other comment. All of the k8s tutorials are written by (or recorded by) people with no idea what they are talking about.

Re: Kubernetes 1.18

#29

Post by mstg »

alpb wrote: post #6
jjtheblunt wrote: post #4

Earlier quoted context omitted.

What are recommendable simpler system examples, or managed options you allude to?

Google Cloud Run, AWS Fargate, Google App Engine, Heroku etc. are comparable experiences to Kubernetes if you have the flexibility of (1) running on cloud (2) not having to configure host OS or rely on host GPUs etc. Disclaimer: I work at Google Cloud Run.

Hello! Cloud Run would be better if it supported Cloud IAP and wildcard managed certificates.

Overall though it is an amazing service and it is really fast and easy to use.

Re: Kubernetes 1.18

#30

Post by alpb »

yahyaheee wrote: post #16
alpb wrote: post #6

Earlier quoted context omitted.

Google Cloud Run, AWS Fargate, Google App Engine, Heroku etc. are comparable experiences to Kubernetes if you have the flexibility of (1) running on cloud (2) not having to configure host OS or rely on host GPUs etc. Disclaimer: I work at Google Cloud Run.

You have vendor lock-in with all of these though

Not really, no.

Cloud Run implements the Knative API, so you can actually take it away and run it on any Kubernetes cluster anywhere on a cloud or in your datacenter.

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