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Matt
Asked: 2016-08-12 09:12:44 +0800 CST

Is it possible to override a single domain name using dnsmasq?

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I have a server application that I'm running two instances of, production and development, namely:

prod.example.com (10.0.0.1)
dev.example.com (10.0.0.2)

A third-party has written a client application which has been hardcoded to point to prod.example.com. But, I want those requests to go to the dev.example.com server and I don't have access to the third-party source code.

I do have access (temporarily) to the LAN that the client and server are running on so I can use dnsmasq to resolve prod.example.com to 10.0.0.2, at which point my work here is done and the client application will be (unknowingly) talking to the development server (or so I thought).

I've gotten as far as adding the following config to dnsmasq.conf..

address=/prod.example.com/10.0.0.2

..which does work, but it has the side-effect of preventing all other domains from resolving.

How can I have my cake and eat it?

routing domain-name-system dnsmasq spoofing

1 Answers

  1. Add this line to /etc/dnsmasq.conf:

    addn-hosts=/etc/dnsmasq.hosts

    Then insert your domain names into /etc/dnsmasq.hosts:

    10.0.0.1  prod.example.com.
10.0.0.2  dev.example.com.

    Don't forget the period at the end of the domain name. It marks it as a TLD, not a local hostname.

    As always after configuration changes, restart dnsmasq:

    sudo service dnsmasq restart
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