Extending Kubectl.pptx

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Extending Kubectl

Agenda
What are Kubetctl plugins
Intro to Krew
Development
Publishing Plugins

Who am I
Engineer on Azure Open-Source team
sig-windows lead
Windows-debug plugin creator
Can build fire in 6 different wa...

Kubectl - Hello old friend
❯ kubectl get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-6d4b75cb6d-9...

Kubectl - Hello new friend
❯ kubectl access-matrix resource configmap
NAME KIND SA-NAMESPACE LIST CREATE UPDATE DELETE
gen...

Kubectl Plugins
Stand alone binary that begins with Kubectl-
◦ kubectl-windows-debug
◦ Kubectl-neat
Added to your PATH
Wri...

Installing and listing plugins
# install plugin
❯ cp kubetctl-capz-ssh /usr/local/bin
# List plugins installed
❯ Kubectl p...

Krew
Plugin manager for kubectl (think apt-get or npm)
200+ plugins
Helps keep thing up to date
Plugin binaries don’t need...

Installing with Krew
❯ kubectl krew search windows
NAME DESCRIPTION INSTALLED
windows-debug Windows node access via kubect...

demo

Developing plugins
KUBECTL PLUGINS
Quick
Keep right in your repo
Simple to install
KREW
Distribution
Manages multiple plat...

What language?
BASH
Easy
Simple build process
GO
Cross platform
Can use cli-runtime library
◦ Printing logic, config, etc
...

What’s in a
krew package
LICENSE FILE READ ME
BINARIES

Krew Manifest
apiVersion: krew.googlecontainertools.github.com/v1alpha2
kind: Plugin
metadata:
name: windows-debug
spec:
v...

Krew Manifest - continued
platforms:
- selector:
matchLabels:
os: darwin
arch: amd64
{{addURIAndSha "https://github.com/js...

Templates
https://github.com/replicatedhq/krew-plugin-
template
https://github.com/kubernetes/sample-cli-plugin

Automating Updates
jobs:
release:
runs-on: ubuntu-latest
- name: build package
run: |
tar -czvf kubectl-windows-debug-${GI...

Krew-release-
bot

Using go-releaser
If you go with golang can use
https://goreleaser.com/ to build all
the packages
builds:
- id: {{ .Plugin...

Lessons Learned
• Underscores - dashes are converted to underscores in Krew
• Without Krew
• Kubectl windows debug
• With ...

Thanks!
https://kubernetes.io/docs/tasks/extend-kubectl/kubectl-plugins/
https://krew.sigs.k8s.io/
https://krew.sigs.k8s.i...

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