DNS on the Android Emulator

The last few days I have been struggling to get the Android Emulator to connect to certain domains through a proxy we have at my job.  Because of this, I started messing with my OS X DNS configuration and got myself in a DNS mess.  I finally figured my way out, so I wanted to share with you how DNS works with the Android Emulator, and hopefully avoid the troubles I ran into.

Android Documentation:

Screen Shot 2016-05-03 at 7.44.53 PM

The Android Emulator uses the DNS settings of your OS X machine from/etc/resolv.conf as mentioned above.  The file looks something like:

# Mac OS X Notice
# This file is not used by the host name and address resolution
# or the DNS query routing mechanisms used by most processes on
# this Mac OS X system.
# This file is automatically generated.
search fios-router.home

This file is re-generated by OS X as you connect to different networks (different WiFi hotspots or ethernet connections) to properly resolve DNS entries while connected to that network.

The thing I didn’t know is that /etc/resolv.conf is by default a symbolic link to /var/run/resolv.conf.  So, if you ever mess with /etc/resolv.conf and want to put back the original, you’ll have to re-create the symbolic link on your system, so that your global overrides are no longer in place.  Create the symbolic link using the following command:

sudo ln -s /var/run/resolv.conf /etc/resolv.conf

Anyways, you can override your DNS entries for the Android Emulator via the command line using the “-dns-server” option, or you can edit /etc/resolv.conf and override it globally.  Just realize that you need to create a symbolic link to /var/run/resolv.conf in order to “revert” changes if you mess with /etc/resolv.conf.

Happy DNS’ing with the Android Emulator and I hope for your case you don’t ever have to deal with it!