网络运维系列：GoDaddy Shell DDNS配置

1. 引言

由于IP地址的稀缺性，日常办理的家用宽带出口IP地址都是动态变化的，为了能够动态的知道家用宽带的出口IP以便能够便捷的访问到家里的网络设备，如NAS、远程桌面等，参考通用做法采用DDNS方案，由于域名是在GoDaddy申请的，整体技术方案需要通过GoDaddy申请秘钥对，然后通过开放URL地址对域名的DNS解析指向进行修改，下面是具体的流程。

2. GoDaddy密钥申请

密钥Key申请：https://developer.godaddy.com/keys ，选择Production，名字自定义即可，生成密钥对后请记得及时保存，后续无法再次查看。

3. Shell脚本配置

#!/bin/bash

# This script is used to check and update your GoDaddy DNS server to the IP address of your current internet connection.
# Special thanks to mfox for his ps script
# https://github.com/markafox/GoDaddy_Powershell_DDNS
#
# First go to GoDaddy developer site to create a developer account and get your key and secret
#
# https://developer.godaddy.com/getstarted
# Be aware that there are 2 types of key and secret - one for the test server and one for the production server
# Get a key and secret for the production server
#
#Update the first 4 variables with your information

domain="your.domain.to.update"   # your domain
name="name_of_host"     # name of A record to update
key="key"     # key for godaddy developer API
secret="secret"   # secret for godaddy developer API

headers="Authorization: sso-key $key:$secret"

# echo $headers

result=$(curl -s -X GET -H "$headers" \ "https://api.godaddy.com/v1/domains/$domain/records/A/$name")

#echo $result;

dnsIp=$(echo $result | grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b")
#echo "dnsIp:" $dnsIp

# Get public ip address there are several websites that can do this.
ret=$(curl -s GET "http://ipinfo.io/json")
currentIp=$(echo $ret | grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b")


#echo "currentIp:" $currentIp

if [ "$dnsIp" != "$currentIp" ];
 then
# echo "Ips are not equal"
	request='[{"data":"'$currentIp'","ttl":3600}]'
# echo " request:" $request nresult=$(curl -i -s -X PUT \ -H "$headers" \ -H "Content-Type: application/json" \ -d $request "https://api.godaddy.com/v1/domains/$domain/records/A/$name") # echo "result:" $nresult
fi

4. 定时任务配置

sudo crontab -e 

*/10 * * * * sh /config/scripts/aliddns/aliddns_erx.sh

5. 参考文档

github地址：https://github.com/markafox/GoDaddy_Powershell_DDNS