Kubernetes is a system that manages the lifecycle of containers

K3s is a distribution of Kubernetes

K3s distinguishing features:
- single binary
- small (<50MB)

-Supports ARM (v7, v8, not v6, also x86_64)

Demo!

Install k3s (server)

# generate a token

export K3S_TOKEN=$(openssl rand -base64 32)

# install k3s

curl -Lo /usr/local/bin/k3s https://github.com/rancher/k3s/releases/download/v1.17.4%2Bk3s1/k3s-arm64 && chmod a+x /usr/local/bin/k3s

# start k3s

k3s server

Looking around....

# Create a symlink or alias

alias k='sudo k3s kubectl'

# /etc/rancher/k3s/k3s.yaml

k get nodes

k describe node <some node>

k get pods --all-namespaces

k describe pod -n kube-system <some pod>

Install k3s (worker)

export K3S_TOKEN=<your token>

export K3S_URL=https://<server ip>:6443

# install k3s

curl -Lo /usr/local/bin/k3s https://github.com/rancher/k3s/releases/download/v1.17.4%2Bk3s1/k3s-arm64 && chmod a+x /usr/local/bin/k3s

# start k3s

k3s agent

k3s kubectl get nodes -w 

Deploy a workload

k create namespace nextcloud

k config set-context --current --namespace nextcloud

k create deploy --image=nextcloud nextcloud

k get pods -w 

k get deploy nextcloud -o yaml

k port-forward <pod name> 8080:80

# browse to http://localhost:8080

Break stuff!

k delete pods --all

k get pods -w

k port-forward <pod name> 8080:80

k describe pod <pod name>

Further down the rabbit hole:

Data storage:

- persistent volumes

- host paths

Secrets

Configmaps

Ingress

Daemonsets

Jobs, CronJobs

RBAC

NodePorts

Operators

Questions?

Thanks!

https://k3s.io

https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/

https://www.katacoda.com/ben_hall/scenarios/k3s​

https://medium.com/@cfatechblog/bare-metal-k8s-clustering-at-chick-fil-a-scale-7b0607bd3541

https://rancher.com/blog/2018/2018-12-17-kubernetes-powers-windmills-rancher-ceo-interview/