bootstrap install k3s via ssh on alpine

.env.sh

#!/bin/sh

export SERVER1="192.168.0.201"
export SERVER2="192.168.0.202"
export SERVER3="192.168.0.203"
export SERVER4="192.168.0.204"

export HOST1="g3w.dell.baza"
export HOST2="g50.dell.baza"
export HOST3="h3m.dell.baza"
export HOST3="g73.dell.baza"

before-install.alpine.sh

#!/bin/sh
# alpine
set -eu

apk update
apk add wireguard-tools
rc-update add cgroups default
rc-service cgroups start
swapoff -a

curl -sfL https://get.k3s.io | INSTALL_K3S_SKIP_ENABLE=true sh -
k3s check-config

install.sh

#!/bin/bash
set -eux
source .env.sh

# shellcheck disable=SC2029
init() {
ssh "root@${1}" "curl -sfL https://get.k3s.io | \
  INSTALL_K3S_EXEC=\"
        server
        --cluster-init
        --tls-san=${1}
        --disable=traefik
        --node-external-ip=${1}
        --flannel-backend=wireguard-native
        --flannel-external-ip
        \" \
        INSTALL_K3S_CHANNEL='stable' sh -"
}

# shellcheck disable=SC2029
join_agent() {
ssh "root@${2}" "curl -sfL https://get.k3s.io | \
  INSTALL_K3S_EXEC=\"
        server
        --server=https://${1}:6443
        --token=${TOKEN}
        --tls-san=${2}
        --disable=traefik
        --node-external-ip=${2}
        --flannel-backend=wireguard-native
        --flannel-external-ip
        \" \
        INSTALL_K3S_CHANNEL='stable' sh -"
}

init "${SERVER1}"

until TOKEN="$(ssh "root@${SERVER1}" cat /var/lib/rancher/k3s/server/node-token)"
do
  sleep 3
done

join_agent "${SERVER1}" "${SERVER2}"
join_agent "${SERVER1}" "${SERVER3}"
join_agent "${SERVER1}" "${SERVER4}"

scp root@"${SERVER1}":/etc/rancher/k3s/k3s.yaml $(pwd) && sed -i "s/127.0.0.1/${SERVER1}/g" k3s.yaml && export KUBECONFIG=$PWD/k3s.yaml

uninstall.sh

#!/bin/bash
set -e
source .env.sh

echo "Are you sure?"; read -r
delete() {
  ssh "root@${1}" "rc-service k3s stop || true && /usr/local/bin/k3s-uninstall.sh" || true
}

delete "${SERVER1}"
delete "${SERVER2}"
delete "${SERVER3}"
delete "${SERVER4}"