#cloud-config
runcmd:
 - |
   # change here
   NET=10.0.0 # internal subnet of virtual machines
   PASS="super-secret-password" # a secret password to generate tokens
   # end changes
   IP="$(hostname | sed -e 's/[^0-9]*//')"
   IF="$(ip -o -4 route show to default | awk '{print $5}')"
   OUT="$(ip -o -4 route show to default | awk '{print $9}')"
   # configure static ip - comment this if aassigned automatically
   printf "network:\n version: 2\n renderer: networkd\n ethernets:\n  $IF:\n    addresses:\n     - $NET.$IP/24" | tee /etc/netplan/90-static.yaml
   netplan apply
   # install and start microk8s
   snap install microk8s --classic
   ufw allow in on cni0 && sudo ufw allow out on cni0
   ufw default allow routed
   microk8s start
   microk8s status  
   if test "$IP" = "1"
   then microk8s enable dns storage ingress        
        for I in $(seq 1 9)
        do TOKEN=$(echo "$I$PASS" | sha1sum | awk '{ print $1}')
           microk8s add-node -t $TOKEN           
        done 
        microk8s config | sed -e "s|server: https://$NET.1:16443|server: https://$OUT:16443|" >/etc/kubeconfig
   else 
        TOKEN="$(echo "$IP$PASS" | sha1sum | awk '{ print $1}')"        
        while ! microk8s join "$NET.1:25000/$TOKEN"
        do echo retrying to join... ; sleep 10
        done
   fi
apt_update: true
apt_upgrade: true
package_update: true
package_upgrade: true
package_reboot_if_required: false