Dnsmasq - wildcard subdomains on localhost

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I' m writing a multi-tenant web application where admin users create subdomains for each client. Subdomain is how the app knows which client to use for branding. But how the hell can I test something like this locally on a Mac?

If you’re in the same boat or just tired of polluting your /etc/hosts file, it’s time to setup Dnsmasq.

In this article, we’ll setup your Mac to answer all requests for a single top-level domain (TLD), in this case, .test.  So myproject.test and any domain ending in .test will all be directed to your local machine.

Keep in mind this process is valid as of macOS 12.0.1 Monterey.

First, make sure you have Homebrew installed.  That process is well documented so I won’t go into it here.  I will, however, remind you brew veterans to update your installation and packages.

Now, install Dnsmasq.

Now modify the config file at /usr/local/etc/dnsmasq.conf and append the following to the bottom of the file:

Now, create a /etc/resolver/ directory if it doesn’t already exist (requires sudo or root privileges). 

Next, create a file called /etc/resolver/test with the following content:

You can create additional files in this directory with file names that reflect the TLDs you want to add with the same content.

Now, start the dns service.

You’ll get a message about root taking ownership of files. That’s completely normal.

Don’t freak out, this is okay.

This only has to be done once since the service persists through reboots.

Now you can ping any domain ending in .test and it will resolve to your localhost at 127.0.0.1.

myproject.test now points to 127.0.0.1

Special Note For .local Domains

Recently, macOS is handling this TLD since it is technically supposed to refer to LAN traffic.  I stumbled across a workaround. If you need to support legacy projects with *.local domains, you’ll need one more step. In System Preferences -> Network -> Advanced -> DNS, add local to Search Domains. Now your system will handle *.local domains.

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