利用ChangeIP.com的免费DNS服务，创建自己的动态DNS（DDNS）

动态DNS（DDNS），适用于动态VPS/独服，或自动更换IP的NAT VPS，免于自己更换IP。

一、在ChangeIP.com注册、创建DNS

打开 https://www.changeip.com/accounts/cart.php?a=add&pid=5，创建二级域名

二、在自己的VPS/独服上，使用脚本自动更新IP

1、在主机上创建ddns.sh的脚本（假设在/root目录）

nano /root/ddns.sh 或者 vi /root/ddns.sh

2、粘贴下面的内容，注意修改11、12、13行为自己的信息，并保存。

#!/bin/bash # Changeip.com Script for Linux base systems using bash # Created to suite local need in specific case. Well tested with CENTOS 6.x n UBUNTU 12.x # Syed . Jahanzaib . aacable at hotmail dot com # October , 2015 # Uncomment below to view debug log # set -x # Various variables, make sure to change the changeip.com credentials and hostname as required. CIPUSER=您在ChangeIP注册的邮箱 CIPPASS=您在ChangeIP的账号密码 CIPHOST=您在ChangeIP设置的域名 URL="https://nic.changeip.com/nic/update?ip" # Temp files and log file to record updates if required EXTIP="/tmp/externalip.txt" NEWIP="/tmp/newip.txt" LOG="/var/log/changeip.log" DATE=`date` # If external ip text file not found, then create one if [ ! -e "$EXTIP" ] ; then touch "$EXTIP" fi # Download current LIVE ip from intenret to match with old ip wget -q -O /tmp/newip.txt http://ip.changeip.com:8245 a=`cat $EXTIP` b=`cat $NEWIP | cut -f 2 -d "=" | cut -f 1 -d "-" -s | grep -m 1 ^` if [[ $a != "$b" ]] then # changeip update now curl "$URL=$b&u=$CIPUSER&p=$CIPPASS&hostname=$CIPHOST" # Update New WAN IP in OLD File echo $b > $EXTIP echo # Print OLD vs New Comparision for REVIEW echo Old IP = $a echo New IP = $b echo Update Time = $DATE echo Update Done. # Print OLD vs New Comparision for REVIEW in LOG FILE for later review echo "*********************************************" >> $LOG echo New IP FOUND > $LOG echo Old IP = $a >> $LOG echo New IP found at $DATE and IP is = $b >> $LOG # IF OLD and NEW ip are same, then no need to update, just EXIT else echo $DATE / No need to change IP. DDNS BASH Script / Powered by Syed Jahanzaib fi # END

3、修改脚本权限，并测试

chmod +x /root/ddns.sh bash /root/ddns.sh

###返回下面的信息，表示脚本正常###

200 Successful Update Old IP = 219.76.163.216 New IP = 220.246.88.57 Update Time = Sat Feb 8 22:11:04 CST 2020 Update Done.

设置定时更新，以便及时更换IP

crontab -e

粘贴下方命令并保存

*/1 * * * * /root/ddns.sh >/dev/null 2>&1 &

这样，当IP变化时，就可以在changip.com后台看到A记录的变化。也可以ping这个域名，获取变化后的IP。

转自：https://docs.anyhk.net/anyhk-nat/ddns-changeip

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