If you're using Docker on OSX, then you'll be using a VM to run your Docker service on, as it needs Linux, not Unix. The most popular of these seems to be boot2docker, though dvm also seems to be quite popular. Other solutions are available.
I have a problem where sometimes boot2docker's DNS just doesn't seem to work.
I found some instructions on how to fix it though:
$ boot2docker ssh
$ sudo udhcpc
udhcpc (v1.22.1) started
Sending discover...
Sending select for 10.0.2.15...
Lease of 10.0.2.15 obtained, lease time 86400
deleting routers
route: SIOCDELRT: No such process
adding dns 192.168.1.1
$ sudo /etc/init.d/docker restart
$ exit
Now if you attempt to ping Google, it should work!
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