nsupdate -k K*****.key>server 192.*.*.*        #dns server ip address>update delete yourfqdn A delete>update add yourFQDN 600 A your new IP

#!/bin/bash
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##　　　　Author:Medici.Yan@gmail.com
#########################################PATH=/sbin:/bin:/usr/sbin:/usr/binexport PATHusage(){        echo "  Usage:$0 [-i interface] [-d basedir] [-h hostname] [-t ttl] [-s servername] [-k keyfile] [-c ClientIP] [-m testdomain]"        echo "          Default:"        echo "                   -i eth0 -d /usr/local/ddns -t 600 -k /usr/local/ddns/*.key"        echo ""        echo "  Notice:  如果你自己的主机是DNS Server,那么你不能改变你自己的 hostname 与 IP"        echo "          如果你不知道你的DNS Server是什么，就加上-m 参数，后面是测试的域名，eg:$0 -m swu.edu.cn "        echo "  Notice:  If your PC is your DNS Server, you can‘t change your hostname and IP"        echo "          If you don‘t know your DNS Server Address, you can use the param [-m TestDomain] to get the right server address，eg:$0 -m swu.edu.cn "    exit 1}((params=$#%2))if [[ $# -gt 14 ]]; then        usage#elif [ $params -eq 1 ]; then#       usagefi#设置默认参数值domain="swu.edu.cn"                             #默认测试DNS Server 地址的域名basedir="/usr/local/ddns"                       # 基本工作目录keyfile="$basedir"/"`ls $basedir|grep ‘.key$‘`" #公钥文件ttl=600                                         # ttlinterface="eth0"                                # 对外的联机接口！hostname=`hostname`servername=`grep ‘nameserver‘ /etc/resolv.conf | head -n 1 |awk ‘{print $2}‘`   #dns Server IPnewip=`ifconfig "$interface" | grep ‘inet addr‘ | awk ‘{print $2}‘ | sed -e "s/addr\://"`       #IP地址#处理NetworkManager管理DNS Server，基本上用不到，一般在启动NetworkManager后会自动修改resolv.confif [ "$servername" == "" ]; then        servername=`nslookup $domain|grep Server|awk ‘{print $2}‘`fi#获取用户输入参数，如不指定则使用默认参数while [ $# -gt 0 ]do        case $1 in                -i)shift;interface=$1;shift;;                -d)shift;basedir=$1;shift;;                -h)shift;hostname=$1;shift;;                -t)shift;ttl=$1;shift;;                -s)shift;servername=$1;shift;;                -k)shift;keyfile=$1;shift;;                -c)shift;newip=$1;shift;;                -m)shift;domain=$1;shift;;                *)usage;;        esacdone#自动查找DNS和手动都找不到DNS则退出if [ "$servername" == "" ]; then        echo "Error:Can not find the DNS Server!"        exit 1fi#检查IP合法性checkip=`echo $newip | grep "^[0-9]"`if [ "$checkip" == "" ]; then        echo "$0: The interface can‘t connect internet...."        exit 1fi#检测basedir目录是否存在,不存在则创建if !([ -d $basedir ]);then        mkdir -p $basedirfi#检测keyfile存在性if !([ -f $keyfile ]);then        echo "Error:$keyfile does not exist!"        exit 1fitmpfile=$basedir/tmp.txt#如果文件不存在,则创建if !([ -f $tmpfile ]);then        touch $tmpfile        #查看是否创建成功        if !([ -f $tmpfile ]);then                echo "Permission Denyed,Can not touch $tmpfile in $basedir"                exit 1        fifi#写入配置文件echo "server $servername" > $tmpfileecho "update delete $hostname A " >> $tmpfileecho "update add $hostname $ttl A $newip" >> $tmpfileecho "send" >> $tmpfile#更新nsupdate -k $keyfile -v $tmpfile