kubernetes/contrib/dns-server-for-vhost-ingress-testing/deploy_dns.sh

#!/bin/bash -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.
#
DNS_PORT=31555
CLUSTER_CONTROL=$( kubectl get no -l node-role.kubernetes.io/controlplane=true -o jsonpath='{.items..metadata.name}')
CLUSTER_IP=$(kubectl get no $CLUSTER_CONTROL  -o jsonpath='{.metadata.annotations.rke\.cattle\.io/external-ip }')
SPATH="$( dirname "$( which "$0" )" )"



usage() {
cat << ==usage
$0 [cluster_domain] [lb_ip] [helm_chart_args] ...
	[cluster_domain] Default value simpledemo.onap.org
	[lb_ip] Default value LoadBalancer IP
	[helm_chart_args] ... Optional arguments passed to helm install command
$0 --help This message
$0 --info Display howto configure target machine
==usage
}


target_machine_notice_info() {
cat << ==infodeploy
Extra DNS server already deployed:
1. You can add the DNS server to the target machine using following commands:
	sudo iptables -t nat -A OUTPUT -p tcp -d 192.168.211.211 --dport 53 -j DNAT --to-destination $CLUSTER_IP:$DNS_PORT
	sudo iptables -t nat -A OUTPUT -p udp -d 192.168.211.211 --dport 53 -j DNAT --to-destination $CLUSTER_IP:$DNS_PORT
	sudo sysctl -w net.ipv4.conf.all.route_localnet=1
	sudo sysctl -w net.ipv4.ip_forward=1
2. Update /etc/resolv.conf file with nameserver 192.168.211.211 entry on your target machine
==infodeploy
}


list_node_with_external_addrs()
{
	local WORKER_NODES=$(kubectl get no -l node-role.kubernetes.io/worker=true -o jsonpath='{.items..metadata.name}')
	for worker in $WORKER_NODES; do
		local external_ip=$(kubectl get no $worker  -o jsonpath='{.metadata.annotations.rke\.cattle\.io/external-ip }')
		local internal_ip=$(kubectl get no $worker  -o jsonpath='{.metadata.annotations.rke\.cattle\.io/internal-ip }')
		if [ $internal_ip != $external_ip ]; then
			echo $external_ip
			break
		fi
	done
}

ingress_controller_ip() {
	local metal_ns=$(kubectl get ns --no-headers --output=custom-columns=NAME:metadata.name |grep metallb-system)
	if [ -z $metal_ns ]; then
		echo $CLUSTER_IP
	else
		list_node_with_external_addrs
	fi
}

deploy() {
	local ingress_ip=$(ingress_controller_ip)
	pushd "$SPATH/bind9dns" > /dev/null
	if [ $# -eq 0 ]; then
		local cl_domain="simpledemo.onap.org"
	else
		local cl_domain=$1
		shift
	fi
	if [ $# -ne 0 ]; then
		ingress_ip=$1
		shift
	fi
	helm install . --set dnsconf.wildcard="$cl_domain=$ingress_ip" $@
	popd > /dev/null
	target_machine_notice_info
}

if [[ $# -eq 1 ]] && [[ $1 = "-h" || $1 = "--help" ]]; then
	usage
elif [[ $# -eq 1 ]] && [[ $1 = "--info" ]]; then
       target_machine_notice_info
else
	deploy $@
fi