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Mastering Ubuntu Server

You're reading from   Mastering Ubuntu Server Upgrade your Ubuntu skills

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Product type Paperback
Published in Jul 2016
Publisher
ISBN-13 9781785284526
Length 430 pages
Edition 1st Edition
Concepts
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Author (1):
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Jay LaCroix Jay LaCroix
Author Profile Icon Jay LaCroix
Jay LaCroix
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Toc

Table of Contents (16) Chapters Close

Preface 1. Deploying Ubuntu Server FREE CHAPTER 2. Managing Users 3. Managing Storage Volumes 4. Connecting to Networks 5. Managing Software Packages 6. Controlling and Monitoring Processes 7. Managing Your Ubuntu Server Network 8. Accessing and Sharing Files 9. Managing Databases 10. Serving Web Content 11. Virtualizing Hosts and Applications 12. Securing Your Server 13. Troubleshooting Ubuntu Servers 14. Preventing and Recovering from Disasters Index

Creating a secondary DNS server


Depending on just one server to provide a resource to your network is almost never a good idea. If our DNS server has a problem and fails, our network users will be unable to resolve any names, internal or external. To rectify this, we can actually set up a slave DNS server that will cache zone records from the master, and allow name resolution to work in case the primary fails. This is not required, but redundancy is always a good thing.

To set up a secondary DNS server, we first need to configure our primary server to allow it to transfer zone records to a slave server. To do so, we'll need to edit the /etc/bind/named.conf.options file, which currently looks similar to the following:

options {
        directory "/var/cache/bind";
        forwarders {
                8.8.8.8;
                8.8.4.4;
        };
        dnssec-validation auto;

        auth-nxdomain no;
        listen-on-v6 { any; };
};

I've omitted some redundant lines from the file (such as...

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