client-go
cobra
Our great sponsors
client-go | cobra | |
---|---|---|
38 | 129 | |
8,586 | 35,827 | |
1.5% | - | |
9.3 | 7.8 | |
7 days ago | 9 days ago | |
Go | Go | |
Apache License 2.0 | Apache License 2.0 |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
client-go
-
The Inner Workings of Kubernetes Management Frontends — A Software Engineer’s Perspective
The Kubernetes clients (e.g., Go client) support developers with both methods to connect to a cluster, as we can see in the following examples.
-
Has anyone ever tried to learn how k8s works?
My suggestion would be to start looking at things like https://github.com/kubernetes/client-go first in order to get a feel for the API and how data plane k8s components interact with the apiserver (it's the same thing that kubelet uses). Then move on to trying to build your own k8s operator to get a feel for how people expand and customize k8s functionality without having to modify upstream at all. IMO the codebase itself is too messy and in constant flux to make too much sense of it unless you are planning to contribute to upstream.
-
Can't override Kubernetes config in Kubernetes Go client
GitHub related issue https://github.com/kubernetes/client-go/issues/735
-
CUE compared to helm/kustomize...
CUE is cool and all but as soon as I start writing real code structures I want to reach for client-go.
-
Go 1.21 will (probably) download newer toolchains on demand by default
I'm... really not sure I agree with this, from a philosophical point of view. It feels like this is making "eh, we'll just upgrade our Go version next quarter" too easy; ultimately some responsibility toward updating your application's Go version to work with what new dependencies require should fall on Us, the application developers. Sure, we're bad at it. Everyone's lived through running years-old versions of some toolchain. But I think this just makes the problem worse, not better.
Its compounded by the problem that, when you're setting up a new library, the `go` directive in the mod file defaults to your current toolchain; most likely a very current one. It would take a not-insignificant effort on the library author's part to change that to assert the true-minimum version of Go required, based on libraries and language features and such. That's an effort most devs won't take on.
I'd also guess that many developers, up-to this point if not indefinitely because education is hard, interpreted that `go` directive to mean more-of "the version of go this was built with"; not necessarily "the version of go minimally required". There are really major libraries (kubernetes/client-go [1]) which assert a minimum go version of 1.20; the latest version (see, for comparison, the aws-sdk, which specifies a more reasonable go1.11 [2]). I haven't, you know, fully audited these libraries, but 1.20 wasn't exactly a major release with huge language and library changes; do they really need 1.20? If devs haven't traditionally operated in this world where keeping this value super-current results in actually significant downstream costs in network bandwidth (go1.20 is 100mb!) and CI runtime, do we have confidence that the community will adapt? There's millions of Go packages out there.
Or, will a future version of Go patch a security update, not backport it more than one version or so, and libraries have to specify the newest `go` directive version, because manifest security scanning and policy and whatever? Like, yeah, I get the rosy worldview of "your minimum version encodes required language and library features", but its not obvious to me that this is how this field is, or even will be, used.
Just a LOT of tertiary costs to this change which I hope the team has thought through.
[1] https://github.com/kubernetes/client-go/blob/master/go.mod#L...
-
How to list all kubernetes objects with specific label using client-go
I looked at dynamic package, but it seems like it needs GroupVersionResource, which is different for, say, Service objects and Deployment objects. Also when I pass schema.GroupVersionResource{Group: "apps", Version: "v1"} it doesn't find anything, when I pass schema.GroupVersionResource{Version: "v1"} it finds only namespace object and also doesn't looks for labels, though I provided label options:
-
What's the best way to get notified when kubernetes Deployments change using the k8s.io/client-go library?
I'm writing a script that uses the k8s.io/client-go library (godocs here) to manipulate Deployments. In particular, I want to add a label selector to every Deployment in my cluster. Deployment label selectors are immutable. So my approach is to:
- K8S Get deployment liveness probe status
-
Learning kubebuilder - good examples of Golang watching/manipulating k8s objects?
Actually, kubebuilder is not using the standard Go libraries, but one using reflection to dynamically resolve the client based on the type you hand it (which is arguably better). The "official" client is k8s.io/client-go.
-
My LFX Mentorship experience with OpenELB
Then on June 18th, 2022, I got a chance to meet our mentors and the other mentee of OpenELB (the mentee and the mentors of OpenFunction were also there). There I was informed about how to start working on the project, so I started learning about using the Kubernetes API client. After experimenting with the official Kubernetes Client, I learned that it's not very feasible to use that for dealing with CRDs (custom resource definitions), so I explored the controller-runtime client as per what I found in many sources, and found that it was a great fit for the backend of our project. During that time, I also built a simple project to see if everything would work as expected or not (as this was the first time I dealt with a Kubernetes client, I considered that debugging would be easier in a smaller project).
cobra
-
The power of the CLI with Golang and Cobra CLI
We can use the flag with --date or -date, Go already does the automatic check. We can make our entire boilerplate with this approach, but let's make it a little easier and use the Cobra CLI package.
-
Build your own curl in Golang
In this tutorial, we'll walk through the process of creating a simple command-line tool similar to curl using Go and Cobra, a CLI library for Go.
-
Scripts should be written using the project main language
I use https://github.com/spf13/cobra religiously for this kind of thing - it handles all the annoying corner cases of parsing flags, and also has an intuitive notion of subcommands (with basic usage/help text generated) for picking which task you want to run with positional arguments.
-
Command Line Interface Guidelines
We recently chose cobra[1] to create a cli application. It comes with so many best practices already packaged like autocompletions, help texts etc. etc.
-
What 3rd-party libraries do you use often/all the time?
github.com/spf13/cobra
- O poder do CLI com Golang e Cobra CLI
-
How to read Cobra command line flag
I looked at the docs: https://cobra.dev/ ... and there are only examples on how to add new flags.
-
Dockerizing Golang CLI Tool - A Step-by-Step Guide
For installing Cobra-CLI you can go to Cobraor run go install github.com/spf13/cobra-cli@latest in the terminal.
-
Packaging Go for Arch Linux Tutorial
In my build phase, I compile the source to create a k3sup binary and I also run the binary to generate shell script completions. Give kudos to this functionality which comes from spf13/cobra Go library for CLIs.
-
Add License Headers to Your Code Files
NWA is a command-line tool built on cobra. Here's an overview of NWA's commands:
What are some alternatives?
kubebuilder - Kubebuilder - SDK for building Kubernetes APIs using CRDs
urfave/cli - A simple, fast, and fun package for building command line apps in Go
controller-runtime - Repo for the controller-runtime subproject of kubebuilder (sig-apimachinery)
cli - CLI - A package for building command line app with go
kustomize - Customization of kubernetes YAML configurations
kingpin - CONTRIBUTIONS ONLY: A Go (golang) command line and flag parser
celery - Distributed Task Queue (development branch)
kong - Kong is a command-line parser for Go
apimachinery
go-flags - go command line option parser
k3s - Lightweight Kubernetes
mitchellh/cli - A Go library for implementing command-line interfaces.