K3s and Kubernetes in not very many minutes
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!
K3s and Kubernetes in not very many minutes
By Sten Turpin
K3s and Kubernetes in not very many minutes
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