Add initial setup & configure-node script

charts/

#!/bin/bash

set -eu

USAGE="Usage:

$0 [-h] [-i INTERFACE] [-d DOMAIN] [-t TOKEN] [-u <control|gateway>]

-h|--help       Show this usage and exit

-i|--interface  Use the first address of INTERFACE as a API advertisement address

-d|--domain     Use DOMAIN as the control plane nodes' shared DNS name

-t|--token      Join a cluster using TOKEN

-u|--use        Configure the node for the comma separated uses. 

                Choices out of: control, gateway

"

shopt -s lastpipe

source "${SCRIPTS:=$(dirname "$0")}/lib.bash"

declare -a packages

declare -a kubeadm_args

[[ -v USES ]] && split uses "$USES"

while let $#; do

	case $1 in

		-h|--help) echo "$USAGE"; exit 0 ;;

		-i|--interface) INTERFACE=$2; shift ;;

		-d|--domain) API_DOMAIN=$2; shift ;;

		-t|--token) TOKEN=$2; shift ;;

		-u|--use) split uses "$2"; shift ;;

	esac

	shift

done

# grep -q memory /proc/cgroups || fatal \

# 	"Memory cgroup is not enabled; either remove cgroup_disable=memory" \

# 	"or add cgroup_enable=memory to the kernel cmdline and restart."

has jq || packages+=(jq)

if ! has kubeadm || ! has kubectl; then

	"$SCRIPTS/setup" "${packages[@]}"

elif [[ -v packages[0] ]]; then

	apt-get update

	apt-get install -y "${packages[@]}"

fi

if [[ -v INTERFACE ]]; then

	ip -j -4 addr show "$INTERFACE" |

		jq -r '.[].addr_info[] | select(.scope == "global") | .local' |

		readarray -t addresses

	[[ -v addresses[0] ]] || fatal "No inet address found for $INTERFACE"

	kubeadm_args+=(--node-ip="${addresses[0]}")

fi

if [[ ! -v TOKEN ]]; then

	# --domain/API_DOMAIN provides a DNS name which resolves to all control 

	# plane nodes

	kubeadm_args+=(--control-plane-endpoint=${API_DOMAIN:=k8s.net.kodo.org.uk})

	# We will use Cilium's kube-proxy replacement...

	kubeadm_args+=(--skip-phases=addon/kube-proxy) 

fi

if [[ -v TOKEN ]]; then

	kubeadm join "${API_DOMAIN}" "$TOKEN" "${kubeadm_args[@]}"

else

	kubeadm init "${kubeadm_args[@]}"

	export KUBECONFIG=/etc/kubernetes/admin.conf

	kubectl kustomize --enable-helm . | kubectl apply -f-

	uses+=(control)

fi

namespace: kube-system

helmCharts:

- name: cilium

  repo: https://helm.cilium.io/

  version: v1.17.4

  valuesInline:

    kubeProxyReplacement: true

    k8sServiceHost: k8s.net.kodo.org.uk

    k8sServicePort: 6443