nsupdate -k K*****.key

>server .*.*.*        #dns server ip address

>update delete yourfqdn A delete

>update add yourFQDN  A your new IP

#!/bin/bash
#########################################
##
##　　　　Author:Medici.Yan@gmail.com
#########################################

PATH=/sbin:/bin:/usr/sbin:/usr/bin

export PATH

usage(){

        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

}

((params=$#%))

if [[ $# -gt  ]]; then

        usage

#elif [ $params -eq 1 ]; then

#       usage

fi

#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=                                         # ttl

interface="eth0"                                # 对外的联机接口！

hostname=`hostname`

servername=`grep 'nameserver' /etc/resolv.conf | head -n  |awk '{print $2}'`   #dns Server IP

newip=`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.conf

if [ "$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  ]

do

        case $ in

                -i)shift;interface=$;shift;;

                -d)shift;basedir=$;shift;;

                -h)shift;hostname=$;shift;;

                -t)shift;ttl=$;shift;;

                -s)shift;servername=$;shift;;

                -k)shift;keyfile=$;shift;;

                -c)shift;newip=$;shift;;

                -m)shift;domain=$;shift;;

                *)usage;;

        esac

done

#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

fi

#检查IP合法性

checkip=`echo $newip | grep "^[0-9]"`

if [ "$checkip" == "" ]; then

        echo "$0: The interface can't connect internet...."

        exit 

fi

#检测basedir目录是否存在,不存在则创建

if !([ -d $basedir ]);then

        mkdir -p $basedir

fi

#检测keyfile存在性

if !([ -f $keyfile ]);then

        echo "Error:$keyfile does not exist!"

        exit

fi

tmpfile=$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

        fi

fi

#写入配置文件

echo "server $servername" > $tmpfile

echo "update delete $hostname A " >> $tmpfile

echo "update add $hostname $ttl A $newip" >> $tmpfile

echo "send" >> $tmpfile

#更新

nsupdate -k $keyfile -v $tmpfile