k3s

curl -sfL https://get.k3s.io | sh -
# kubeconfig at /etc/rancher/k3s/k3s.yaml
# systemd service: k3s.service

curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="--disable traefik --disable servicelb" sh -
# disable built-in ingress/LB when using alternatives

mkdir -p ~/.kube
sudo cp /etc/rancher/k3s/k3s.yaml ~/.kube/config
sudo chown "$(id -u)":"$(id -g)" ~/.kube/config
chmod 600 ~/.kube/config

sudo systemctl status k3s
sudo systemctl restart k3s
sudo systemctl stop k3s
journalctl -u k3s -f                   # follow k3s logs
journalctl -u k3s --since "10 minutes ago"

kubectl get nodes -o wide
kubectl get pods -A                     # all pods in all namespaces
kubectl cluster-info
k3s check-config                        # validate system prerequisites

kubectl get pods -n kube-system         # coredns, metrics-server, local-path
kubectl get svc -n kube-system          # cluster services

sudo k3s crictl ps                      # list running containers
sudo k3s crictl images                  # list cached images
sudo k3s crictl pull docker.io/library/nginx:1.25-alpine
sudo k3s crictl logs <container-id>

kubectl get storageclass
# local-path is the default StorageClass
# PVs created at /var/lib/rancher/k3s/storage/ on the node

# k3s watches /var/lib/rancher/k3s/server/manifests/
# Any YAML placed here is automatically applied
sudo cp my-deployment.yaml /var/lib/rancher/k3s/server/manifests/

/usr/local/bin/k3s-uninstall.sh         # server uninstall
/usr/local/bin/k3s-agent-uninstall.sh   # agent uninstall (if joined to cluster)