kubectl
cobra
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kubectl | cobra | |
---|---|---|
13 | 129 | |
2,684 | 35,985 | |
1.8% | - | |
9.2 | 7.8 | |
1 day ago | 2 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.
kubectl
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What are these orphaned PVC objects?
Check https://github.com/kubernetes/kubectl/issues/151
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Setting kubectl context via env var
I have read this issue, and up to now it seems not possible to change the kubectl context via an env var: https://github.com/kubernetes/kubectl/issues/1154
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Deciding between Rust or Go for desktop applications
However, I would encourage people to take a look at what the code looks like before assuming the Go developer experience on this was positive. Bear in mind that's just the top level kubectl command and some helper functions, the subcommand definitions take up a several more files split into a few more packages. Then you're still not even done, because code that uses the parsed flags still has to redundantly check things that couldn't be enforced at the type level, something Go folks like to pretend is a good thing for some reason.
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Recommendations on file/dir/module structure, common dependencies, and/or anti-patterns for writing CLI tool in Rust
kubectl is for sure battle tested, but it involves very Kubernetes specific implementations and is going to be too complicated for the first pointer
- Recommendations on building a simple DSL REPL?
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Why Go and Not Rust?
> context.Background() is typically only used when one doesn’t care about the result. If you did care about the result, you should be passing the parent context to preserve the circuit breaker timeout in case the operation takes too long.
Not necessarily. You would use context.Background in a test situation. It's also commonly used for short-lived applications like a CLI invocation. You can see kubectl uses context.Background quite a lot: https://github.com/kubernetes/kubectl/search?q=context.backg...
> I think the level of pain you experience from mutable references in Rust depends on if you’re coming from an OOP or FP background. I have a FP background and so the patterns I use to build code already greatly restrict mutation. You can usually change code that updates data immutably (creating a new copy of it) with mutable code in rust because the control flow of your program already involves passing that new version back to the caller which also satisfies the borrow checker in most situations.
There has to be a better solution to needlessly copying data.
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kubectl - Create PV/PVC
This is particularly useful for academic purposes, and makes somehow convinient to get the yaml template of k8s objects. I was looking for this as well due to an upcoming ckad test i have. Unfourtunately due to not being considered best practice the request for it was dismissed. https://github.com/kubernetes/kubectl/issues/1073
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Must `kubectl apply` twice to allow CRD usage?
I see, apologies, I did misunderstand. This is actually a known race condition between kubectl (or even helm, or any Kube API client) issuing the requests to deploy CRs that depend on CRDs while those CRDs are still being installed on the API server. Simply put, kubectl makes these requests too quickly. There is no solution to this currently aside from deploying CRDs separately from the resources they expose. See this kubectl issue: https://github.com/kubernetes/kubectl/issues/1117, and there are some links in the comments to other issues echoing the same problem in helm and elsewhere.
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What's the number one annoyance that drives you crazy about Kubernetes?
Go add --no-really-all if you really want it: https://github.com/kubernetes/kubectl
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How to change a POD label via client-go?
You could take a look at how kubectl actually does it: https://github.com/kubernetes/kubectl/blob/master/pkg/cmd/label/label.go
cobra
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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.
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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.
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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.
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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.
[1]: https://github.com/spf13/cobra
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What 3rd-party libraries do you use often/all the time?
github.com/spf13/cobra
- O poder do CLI com Golang e Cobra CLI
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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.
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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.
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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.
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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?
helm - The Kubernetes Package Manager
urfave/cli - A simple, fast, and fun package for building command line apps in Go
robusta - Kubernetes observability and automation, with an awesome Prometheus integration
cli - CLI - A package for building command line app with go
kubernetes - Production-Grade Container Scheduling and Management
kingpin - CONTRIBUTIONS ONLY: A Go (golang) command line and flag parser
client-go - Go client for Kubernetes.
kong - Kong is a command-line parser for Go
cli - GitHub’s official command line tool
go-flags - go command line option parser
Mattermost - Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
mitchellh/cli - A Go library for implementing command-line interfaces.