pi cluster

NFS

Client

sudo apt update
sudo apt install nfs-common

Server

sudo apt update
sudo apt install nfs-kernel-server
sudo mkdir /nfs
sudo chown -R nobody:nogroup /nfs

NFS export config

sudo vim /etc/exports
/nfs 192.168.1.0/24(rw,sync,no_subtree_check)

NFS client mount

sudo mkdir /mnt/nfs
sudo mount <HOST_IP>:/nfs /mnt/nfs

k3s.io

Enabling cgroups

• append cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory to /boot/cmdline.txt
• optional: append arm_64bit=1 to /boot/config.txt under [all] on 32-bit Raspberry Pi OS (arm_64bit)

Disable swap

sudo swapoff -a
sudo sed -i 's/CONF_SWAPSIZE=100/CONF_SWAPSIZE=0/' /etc/dphys-swapfile

Master installation/upgrade

ctrl+x ctrl+e

export K3S_KUBECONFIG_MODE="644"
export INSTALL_K3S_EXEC="--disable servicelb --disable traefik"
export INSTALL_K3S_VERSION=$(curl -sL https://api.github.com/repos/k3s-io/k3s/releases/latest | grep -Po '"tag_name": "\K.*?(?=")')
curl -sfL https://get.k3s.io | sh - 

Node installation/upgrade

On master sudo cat /var/lib/rancher/k3s/server/node-token

export K3S_KUBECONFIG_MODE="644"
export INSTALL_K3S_VERSION=$(curl -sL https://api.github.com/repos/k3s-io/k3s/releases/latest | grep -Po '"tag_name": "\K.*?(?=")')
export K3S_URL="https://192.168.1.4:6443"
export K3S_TOKEN="XXXX"
curl -sfL https://get.k3s.io | sh -

High availibility cluster installation

export K3S_KUBECONFIG_MODE="644"
export INSTALL_K3S_EXEC="--disable servicelb --disable traefik"
export INSTALL_K3S_VERSION=$(curl -sL https://api.github.com/repos/k3s-io/k3s/releases/latest | grep -Po '"tag_name": "\K.*?(?=")')
curl -sfL https://get.k3s.io | sh -s server --cluster-init --token 'secret'

HA node installation

export K3S_KUBECONFIG_MODE="644"
export INSTALL_K3S_EXEC="--disable servicelb --disable traefik"
export INSTALL_K3S_VERSION=$(curl -sL https://api.github.com/repos/k3s-io/k3s/releases/latest | grep -Po '"tag_name": "\K.*?(?=")')
export K3S_TOKEN="secret"
curl -sfL https://get.k3s.io | sh -s server --server https://192.168.1.4:6443

Helm installation

curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash

Helm configuration

mkdir -p ~/.kube
kubectl config view --raw > ~/.kube/config
sudo chmod go-r ~/.kube/config

k9s installation

K9S_VERSION=$(curl -sL https://api.github.com/repos/derailed/k9s/releases/latest | grep -Po '"tag_name": "\K.*?(?=")')
curl -sLO "https://github.com/derailed/k9s/releases/download/$K9S_VERSION/k9s_linux_arm.deb"
sudo dpkg -i k9s_linux_arm.deb
rm k9s_linux_arm.deb