diy_rfc2136_dyndns_with_bind

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diy_rfc2136_dyndns_with_bind [29.10.2013 13:56] – Pascal Suterdiy_rfc2136_dyndns_with_bind [25.06.2021 09:10] – Pascal Suter
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 ever since dyndns stopped to be completely free (including hassle-free) i was looking for alternatives. i recently stumbled across RFC2136 which can be used to provide dynamic dns services. since i have access to two nameservers running bind i decided to try it out.. it works pretty nicely :) ever since dyndns stopped to be completely free (including hassle-free) i was looking for alternatives. i recently stumbled across RFC2136 which can be used to provide dynamic dns services. since i have access to two nameservers running bind i decided to try it out.. it works pretty nicely :)
  
-there is a [[https://doc.pfsense.org/index.php/RFC2136_Dynamic_DNS|howto in the pfsense wiki]], however, that did not work for me. i had to use allow-update reather than update-policy.. don't know why, somehow it just seemed to have been ignored by the version of bind9 i am running on the servers. +there is a [[https://doc.pfsense.org/index.php/RFC2136_Dynamic_DNS|howto in the pfsense wiki]], however, that did not work for me. i had to use allow-update reather than update-policy.. don't know why, somehow it just seemed to have been ignored by the version of bind9 i am running on the servers. I've used in general the setup described in [[http://www.shakabuku.org/writing/dyndns.html|this very detailed webpage about dyndns with bind9]]. 
  
 this following howto will explain how i did my setup so that i could have a little bash script that would allow me to add new hosts to my dyndns with a single command. all my hosts will end with .dyn.mydomain.ch.  this following howto will explain how i did my setup so that i could have a little bash script that would allow me to add new hosts to my dyndns with a single command. all my hosts will end with .dyn.mydomain.ch. 
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  900        ; refresh (15 minutes)  900        ; refresh (15 minutes)
  600        ; retry (10 minutes)  600        ; retry (10 minutes)
- 2600       ; expire (43 minutes 20 seconds)+ 604800     ; expire (1 Week)
  30         ; minimum (30 seconds)  30         ; minimum (30 seconds)
  )  )
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 </code> **note** keep the //add_keys_here// comment exactly as it is, this is the marker for our script so it knows where to add new keys </code> **note** keep the //add_keys_here// comment exactly as it is, this is the marker for our script so it knows where to add new keys
   * edit your main named.conf file, usually in /etc/bind/named.conf and add an include line at the end of your zone definitions like so: <code>include "/etc/bind/dyn/named.conf";</code>   * edit your main named.conf file, usually in /etc/bind/named.conf and add an include line at the end of your zone definitions like so: <code>include "/etc/bind/dyn/named.conf";</code>
-  * create the "add_new_host.sh" script that will add new hosts to our setup. here are the contents of the script: <code>+  * create the "add_new_host.sh" script that will add new hosts to our setup. \\ 
 +**Note**: this script works with older versions of bind9, i.e. versions 9.14 and older i think. in version 9.16 the ''dnssec-keygen'' utility no longer produces tsig keys, so this script should be modified to use the ''tsig-keygen'' utility instead which is easier to use anyway. I just haven't had the time to do this and test it. I'll update this article as soon as i have to add the next dynamic dns host to my system ;) 
 + 
 +here are the contents of the script: <code bash add_new_host.sh>
 #!/bin/bash #!/bin/bash
 if [ -z "$1" -o "$1" == " " ]; then if [ -z "$1" -o "$1" == " " ]; then
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 -rw-r--r-- 1 root bind  322 Oct 29 13:45 named.conf -rw-r--r-- 1 root bind  322 Oct 29 13:45 named.conf
 </code> </code>
 +  * now use the script to add your first hostname. <code>./add_new_host myhost</code>if you did everything correctly (and if i described it all correctly) your client should now be able to update it's own dns entry with the key you received back from the script. 
 +===== script to remove hosts =====
 +optionally you can also create a little script to remove hosts just as easily. create a file called remove_hosts.sh with the following contents<code bash remove_hosts.sh>
 +#!/bin/bash
 +if [ -z "$1" -o "$1" == " " ]; then
 +        echo "usage: remove_host.sh <hostname>"
 +        echo "EXAMPLE: remove_host.sh myhost will remove myhost.dyn.mydomain.ch"
 +        exit 1
 +fi
 +cd /etc/bind/dyn/
 +hostname=${1}.dyn.mydomain.ch.
 +echo "old keys.conf entry: "
 +grep ${hostname} keys.conf
 +echo "remove key for ${hostname}"
 +cat named.conf | sed -e "/^\t\tkey ${hostname}.*$/d" | tee named.conf > /dev/null
 +cat keys.conf | sed -e "/^key ${hostname}.*$/d" | tee keys.conf > /dev/null
 +echo "reload bind";
 +/etc/init.d/bind9 reload
 +echo "currently active hosts:"
 +grep "key " named.conf | awk '{ print $2; }' | tr -d ";"
 +</code>
 +make it executable and run it to remove hotsts. **warning** make a backup of your keys.conf and your named.conf file before testing this :) 
 +  ./remove_host.sh myhost
 +
  • diy_rfc2136_dyndns_with_bind.txt
  • Last modified: 25.06.2021 12:39
  • by Pascal Suter