Linux setup DDNS server automatic Update script

Problem Description: The client is a dynamic IP, after each network to Nsupdate to the client's hostname and IP map to update to the DNS server

The command is as follows:

Nsupdate-k k*****.key>server 192.*.*.*        #dns server IP address>update Delete yourfqdn A delete>update add you Rfqdn A your new IP

This kind of efficiency is a little low, so I wrote a script to update. Paste my script directly. Script: Http://pan.baidu.com/s/1lhlAu

#!/bin/bash############################################# author:[email protected]######################### ############### #PATH =/sbin:/bin:/usr/sbin:/usr/binexport pathusage () {echo "usage:$0 [-I interface] [-D basedir] [-H ho Stname] [-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: If your own host is DNS Server, then you cannot change your own hostname with IP "Ech O "If you do not know what your DNS server is, add-m parameter, followed by the test domain name, eg:$0-m swu.edu.cn" echo "Notice:if your PC is your DNS server, you CA  N ' 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# Set default parameter value domain= "swu.edu.cn" #默认测试DNS the domain name of the Server address basedir= "/usr/local/ddns" # Basic working directory Keyfile= "$ Basedir "/" ' LS $basEdir|grep '. key$ ' "#公钥文件ttl =600 # ttlinterface=" eth0 "# External online interface! Hostname= ' hostname ' servername= ' grep ' nameserver '/etc/resolv.conf | Head-n 1 |awk ' {print $} ' #dns Server ipnewip= ' ifconfig $interface ' | grep ' inet addr ' | awk ' {print $} ' | Sed-e "s/addr\://" ' #IP地址 # handles NetworkManager management of DNS Server, which is basically not used, generally after the boot NetworkManager will automatically modify RESOLV.CONFIF ["$servername " == "" ];    Then Servername= ' nslookup $domain |grep Server|awk ' {print $} ' fi# get user input parameters, use default parameters if not specified while [$#-gt 0]do case $ 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=$1;shift;;  *) usage;; esacdone# automatically find DNS and manually cannot find DNS then exit if ["$servername" = = ""];  Then echo "Error:can not find the DNS server!" Exit 1fi# Check IP legitimacy checkip= ' echo $newip | grep "^[0-9" "If [" $checkip "= =" "]; Then echo "$0:the interface can ' t connect Internet ...."Exit 1fi# detects if the Basedir directory exists, does not exist then creates if!" ([-D $basedir]); then mkdir-p $basedirfi # Detect keyfile Presence if!  ([-F $keyfile]); then echo "Error: $keyfile does not exist!" Exit 1fitmpfile= $basedir/tmp.txt# If the file does not exist, create 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# write config file echo "server $ ServerName "> $tmpfileecho" update delete $hostname a ">> $tmpfileecho" update add $hostname $ttl A $newip "> > $tmpfileecho "Send" >> $tmpfile # Update nsupdate-k $keyfile-V $tmpfile

The test is as follows:

This efficiency has indeed improved a lot.

• This article from: Hobby Linux Technology Network
• This article link: http://www.ahlinux.com/shell/7971.html

Linux setup DDNS server automatic Update script