#!/bin/bash
# 主机名格式为 k8s.node.1-1-1-1.xxx.com，即主机名中包含IP地址
# 如果主机名不是这种方式，需要执行kubectl describe node nodeName来获取IP地址

function dns() {
        nodes=`kubectl get node |awk 'NR>1{print $1}'`
        for node in $nodes;do
                ip=`echo $node |cut -f3 -d'.' |sed 's/-/./g'`
                echo "address=/$node/$ip"
        done
}

dns >/tmp/k8snode.conf
diff -q /tmp/k8snode.conf /etc/dnsmasq.d/k8snode.conf
if [ $? -ne 0 ];then
        echo "update dnsmasq..."
        dns > /etc/dnsmasq.d/k8snode.conf
        systemctl restart dnsmasq.service
fi