UNIX for Dummies Questions & Answers

Hi all.

I need to configure a secondary dns server to get the zones that are in the primary server.
How can I do this? It's possible to make to sync automatically?
What configuration I ahve to do? And in which files?
Thanks in advance.

If anyone could give me examples or a tutorial, that would be great.

Your question is too open. You don't look like you've done your homework which is the quickest way to not get a response on this forum. Figure some stuff out first:


The DNS server you choose and the platform it runs on will need to be determined before you can ask what configuration you need. Also, any DNS server is going to have documentation and a user community that would be your first resources for information on how to set it up.

Sorry for not specify my question. You are right.

I have two servers. One will be primary and the other secondary.
Both have installed CentOS 5.4 and Bind.
The primary is working. It respondes to queries and already have some dns zones "working on it".
So, the question I want to make in the first post was: how to configure secondary (and primary if needed) to automatically get the dns zones from the primary?
What configurations I have to make? And which servers?

I read some websites that say that allow-transfer is needed. But I'm pretty sure that this is not enough.
I already check that the rndc.key is the same in both server, too.
Many websites talk about this, but none says especifically how to implement this configuration. And because primary is already running, I don't want to make "experiences".
Maybe, I will have to try this in a VMWare.

Anyway, if someone could give me some guidance, I appreciate.

Setting up a slave (secondary) DNS server on Centos is relatively easy. allow-transfer is not needed on the slave but must be added to named.conf on the master.

Code:

option {
     .....
     allow-transfer { ip_address_of_slave_dns_server; } ;
     .....
}

You need to add a slave zone to named.conf on the slave. Here is an example of a slave zone:

Code:

zone "example.com" {
   type slave;
   // one or more master nameservers.  Reply with correct IPs.
   masters { 172.100.10.1; 172.100.10.2; };
   // file can be named anything you like but this is a common naming convention
   file "slaves/example.com.zone";
};

Here is the BIND9 Manual. They are several example configurations which should help you.

Thanks for your reply fpmurphy.

It really seems easy.
But,...
This way (as I understand) I have to create a new zone in the slave every time I create a new zone in the master. If I have thousands zones it will take me a long time.
It's possible to do it automatically? i.e., when I create a new zone in the master, the slave gets it? The bind have this option?

Thanks in advance.