As of March 4, 2018, this project is no longer actively maintained. The Docker for Mac app has made significant improvements in terms of mounted volume performance and file watching, so docker-osx-dev is no longer necessary. I tried many different solutions (see Alternatives) that didn't work until I finally stumbled across one that does: rsync. With rsync, build and compilation performance in mounted folders is on par with native OS X performance and standard file watching mechanisms work properly too. However, setting it up correctly is a painful process that involves many steps, so to make life easier, I've packaged this process up in this docker-osx-dev project.