docker mapping volume directory not showing up [closed] - docker

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When I map a directory it doesn't show up in my docker container.
I am on docker 1.11.2 on Mac using toolbox.
calloway$ docker -v
Docker version 1.11.2, build b9f10c9
calloway$ ls -ltr /tmp/foo/
total 0
-rw-r--r-- 1 calloway wheel 0 Jun 8 09:21 regularfile.txt
calloway$ docker run -it -v /tmp/foo:/mytmp -w /mytmp ubuntu bash
root#26fc182f7964:/mytmp# ls
root#26fc182f7964:/mytmp# exit
More exploration: /tmp mapped is /tmp on "default" Virtual Machine.
Joshuas-MBP:~ joshuacalloway$ docker-machine ssh default
## .
## ## ## ==
## ## ## ## ## ===
/"""""""""""""""""\___/ ===
~~~ {~~ ~~~~ ~~~ ~~~~ ~~~ ~ / ===- ~~~
\______ o __/
\ \ __/
\____\_______/
_ _ ____ _ _
| |__ ___ ___ | |_|___ \ __| | ___ ___| | _____ _ __
| '_ \ / _ \ / _ \| __| __) / _` |/ _ \ / __| |/ / _ \ '__|
| |_) | (_) | (_) | |_ / __/ (_| | (_) | (__| < __/ |
|_.__/ \___/ \___/ \__|_____\__,_|\___/ \___|_|\_\___|_|
Boot2Docker version 1.10.3, build master : 625117e - Thu Mar 10 22:09:02 UTC 2016
Docker version 1.10.3, build 20f81dd
docker#default:~$ mkdir /tmp/OnDefaultVM
docker#default:~$ touch /tmp/OnDefaultVM/myfile.txt
docker#default:~$ exit
Joshuas-MBP:~ joshuacalloway$ docker run -it -v /tmp/OnDefaultVM:/mytmp -w /mytmp ubuntu bash
root#1184ff43dc88:/mytmp# ls
myfile.txt