Running k3s on raspberry pi

May 16, 20190 likes423 views

The document discusses running k3s, a lightweight Kubernetes distribution, on a Raspberry Pi single-board computer. It begins with an introduction to k3s and its advantages for resource-constrained edge and IoT devices. Instructions are provided to install k3s on a Raspberry Pi and join it to an existing k3s cluster. An example Python program is given to blink an LED connected to the Raspberry Pi via GPIO to demonstrate controlling the device through k3s.

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Running k3s on
Raspberry Pi

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Kyohei Mizumoto(@kyohmizu)
C# Software Engineer
Interests
Docker/Kubernetes
Go
Security
whoami

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Target
People who:
haven't used k3s
haven't run k3s on Raspberry Pi
are interested in k3s cluster management

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Preferred Knowledge
The basic knowledge of:
Docker
Kubernetes
Virtual Machine(Microsoft Azure)

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Agenda
What is k3s?
Get started
Control Raspberry Pi using k3s

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What is k3s?

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kubernetes = k8s

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k3s = k(8-5)s

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Lightweight Kubernetes
Easy to install
Half the memory
Single binary less than 40MB
k3s - 5 less than k8s

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Great for
Edge
IoT
CI
ARM
k3s - 5 less than k8s

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Changes

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How It Works

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k3s Pronounce "Kubes"...?
https://github.com/rancher/k3s/issues/55

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Get started

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Download Binary
https://github.com/rancher/k3s/releases/latest

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Download Binary
DOWNLOADPATH:
https://github.com/rancher/k3s/releases/download/v0.5.0/k3s
$ wget [DOWNLOADPATH]
$ ls
k3s
$ chmod +x k3s
$ sudo mv k3s /usr/bin/

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Run Server
# Run in the background
$ sudo k3s server &
# Kubeconfig is written to /etc/rancher/k3s/k3s.yaml
$ k3s kubectl get node
NAME STATUS ROLES AGE VERSION
k3s-server Ready <none> 30s v1.14.1-k3s.4
# Run without running the agent
$ k3s server --disable-agent

$2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 18/32 Join Nodes # NODE_TOKEN comes from # /var/lib/rancher/k3s/server/node-token on the server $ sudo k3s agent --server https://myserver:6443 --token ${NODE_TOKEN} Show nodes on server: $ k3s kubectl get node NAME STATUS ROLES AGE VERSION k3s-agent Ready <none> 1h v1.14.1-k3s.4 k3s-server Ready <none> 1h v1.14.1-k3s.4$

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Control Raspberry Pi
using k3s

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Raspberry Pi
https://www.raspberrypi.org/

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Configuration

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Raspberry Pi Configuration

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Raspberry Pi Configuration
Raspberry Pi 3 B+
Breadboard
LED
Resistor
Jump wire

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Required Preparation
Create VM on Microsoft Azure
Run k3s server on the VM (with a node)
Join k3s node on Raspberry Pi
$ k3s kubectl get node
NAME STATUS ROLES AGE VERSION
k3s-server Ready <none> 19d v1.14.1-k3s.4
raspi-1 Ready <none> 16d v1.14.1-k3s.4

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Sample Program(sample.py)
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setup(2,GPIO.OUT)
while True:
GPIO.output(2,True)
time.sleep(1)
GPIO.output(2,False)
time.sleep(1)
GPIO.cleanup()

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Dockerfile
FROM python:3
ADD sample.py /
RUN pip install rpi.gpio
CMD [ "python", "./sample.py" ]

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Create Docker Image
# [NAME] is an account name of Docker Hub
$ docker build -t [NAME]/raspi-sample
# Run container
$ docker run --privileged [NAME]/raspi-sample
# Login to Docker Hub
$ docker login
$ docker push [NAME]/raspi-sample

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Manifest(sample.yaml)
apiVersion: v1
kind: Pod
metadata:
name: sample
spec:
containers:
- name: sample
image: [NAME]/raspi-sample
securityContext:
privileged: true
nodeSelector:
kubernetes.io/arch: arm

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Deploy on Raspberry Pi
$ k3s kubectl apply -f sample.yaml
pod/sample created
# The pod was deployed on Raspberry Pi
$ k3s kubectl get po -o wide
NAME READY STATUS RESTARTS AGE IP
NODE NOMINATED NODE READINESS GATES
sample 1/1 Running 0 48s 10.42.0.6
raspi-1 <none> <none>
The LED blinks!!

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Demo

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Links
https://k3s.io/
https://github.com/rancher/k3s

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Thank you!

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Running k3s on raspberry pi

1. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 1/32 Running k3s on Raspberry Pi

2. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 2/32 Kyohei Mizumoto(@kyohmizu) C# Software Engineer Interests Docker/Kubernetes Go Security whoami

3. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 3/32 Target People who: haven't used k3s haven't run k3s on Raspberry Pi are interested in k3s cluster management

4. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 4/32 Preferred Knowledge The basic knowledge of: Docker Kubernetes Virtual Machine(Microsoft Azure)

5. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 5/32 Agenda What is k3s? Get started Control Raspberry Pi using k3s

6. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 6/32 What is k3s?

7. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 7/32 kubernetes = k8s

8. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 8/32 k3s = k(8-5)s

9. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 9/32 Lightweight Kubernetes Easy to install Half the memory Single binary less than 40MB k3s - 5 less than k8s

10. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 10/32 Great for Edge IoT CI ARM k3s - 5 less than k8s

11. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 11/32 Changes

12. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 12/32 How It Works

13. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 13/32 k3s Pronounce "Kubes"...? https://github.com/rancher/k3s/issues/55

14. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 14/32 Get started

15. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 15/32 Download Binary https://github.com/rancher/k3s/releases/latest

16. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 16/32 Download Binary DOWNLOADPATH: https://github.com/rancher/k3s/releases/download/v0.5.0/k3s $ wget [DOWNLOADPATH] $ ls k3s $ chmod +x k3s $ sudo mv k3s /usr/bin/

17. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 17/32 Run Server # Run in the background $ sudo k3s server & # Kubeconfig is written to /etc/rancher/k3s/k3s.yaml $ k3s kubectl get node NAME STATUS ROLES AGE VERSION k3s-server Ready <none> 30s v1.14.1-k3s.4 # Run without running the agent $ k3s server --disable-agent

18. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 18/32 Join Nodes # NODE_TOKEN comes from # /var/lib/rancher/k3s/server/node-token on the server $ sudo k3s agent --server https://myserver:6443 --token ${NODE_TOKEN} Show nodes on server: $ k3s kubectl get node NAME STATUS ROLES AGE VERSION k3s-agent Ready <none> 1h v1.14.1-k3s.4 k3s-server Ready <none> 1h v1.14.1-k3s.4

19. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 19/32 Control Raspberry Pi using k3s

20. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 20/32 Raspberry Pi https://www.raspberrypi.org/

21. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 21/32 Configuration

22. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 22/32 Raspberry Pi Configuration

23. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 23/32 Raspberry Pi Configuration Raspberry Pi 3 B+ Breadboard LED Resistor Jump wire

24. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 24/32 Required Preparation Create VM on Microsoft Azure Run k3s server on the VM (with a node) Join k3s node on Raspberry Pi $ k3s kubectl get node NAME STATUS ROLES AGE VERSION k3s-server Ready <none> 19d v1.14.1-k3s.4 raspi-1 Ready <none> 16d v1.14.1-k3s.4

25. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 25/32 Sample Program(sample.py) import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) GPIO.setup(2,GPIO.OUT) while True: GPIO.output(2,True) time.sleep(1) GPIO.output(2,False) time.sleep(1) GPIO.cleanup()

26. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 26/32 Dockerfile FROM python:3 ADD sample.py / RUN pip install rpi.gpio CMD [ "python", "./sample.py" ]

27. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 27/32 Create Docker Image # [NAME] is an account name of Docker Hub $ docker build -t [NAME]/raspi-sample # Run container $ docker run --privileged [NAME]/raspi-sample # Login to Docker Hub $ docker login $ docker push [NAME]/raspi-sample

28. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 28/32 Manifest(sample.yaml) apiVersion: v1 kind: Pod metadata: name: sample spec: containers: - name: sample image: [NAME]/raspi-sample securityContext: privileged: true nodeSelector: kubernetes.io/arch: arm

29. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 29/32 Deploy on Raspberry Pi $ k3s kubectl apply -f sample.yaml pod/sample created # The pod was deployed on Raspberry Pi $ k3s kubectl get po -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES sample 1/1 Running 0 48s 10.42.0.6 raspi-1 <none> <none> The LED blinks!!

30. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 30/32 Demo

31. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 31/32 Links https://k3s.io/ https://github.com/rancher/k3s

32. 2019/5/16 Running k3s on Raspberry Pi 127.0.0.1:5500/#1 32/32 Thank you!

Running k3s on raspberry pi

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