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#!/bin/sh -e
#
# Copyright 2020 Samsung Electronics Co., Ltd.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
usage()
{
cat << ==usage
$0 Automatic configuration using external addresess from nodes
$0 --help This message
$0 -h This message
$0 [cluster_ip1] ... [cluster_ipn] Cluster address or ip ranges
==usage
}
find_nodes_with_external_addrs()
{
local WORKER_NODES
WORKER_NODES=$(kubectl get no -l node-role.kubernetes.io/worker=true -o jsonpath='{.items..metadata.name}')
for worker in $WORKER_NODES; do
local external_ip
external_ip=$(kubectl get no $worker -o jsonpath='{.metadata.annotations.rke\.cattle\.io/external-ip }')
local internal_ip
internal_ip=$(kubectl get no $worker -o jsonpath='{.metadata.annotations.rke\.cattle\.io/internal-ip }')
if [ $internal_ip != $external_ip ]; then
echo $external_ip
fi
done
}
generate_config_map()
{
cat <<CNFEOF | kubectl apply -f -
apiVersion: v1
kind: ConfigMap
metadata:
namespace: metallb-system
name: config
data:
config: |
address-pools:
- name: default
protocol: layer2
addresses:
$(for value in "$@"; do echo -e " - $value"; done)
CNFEOF
}
generate_config_from_single_addr() {
generate_config_map "$1 - $1"
}
install_metallb() {
kubectl apply -f https://raw.githubusercontent.com/google/metallb/v0.9.3/manifests/namespace.yaml
kubectl apply -f https://raw.githubusercontent.com/google/metallb/v0.9.3/manifests/metallb.yaml
# Only when install
kubectl create secret generic -n metallb-system memberlist --from-literal=secretkey="$(openssl rand -base64 128)"
}
automatic_configuration() {
install_metallb
generate_config_from_single_addr $(find_nodes_with_external_addrs)
}
manual_configuration() {
install_metallb
generate_config_map $@
}
if [ $# -eq 1 ] && [ "$1" = "-h" ]; then
usage
if [ $# -eq 1 ] && [ "$1" = "--help" ]; then
usage
elif [ $# -eq 0 ]; then
automatic_configuration
else
manual_configuration $@
fi
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