Red Hat Enterprise Linux 7 - Docker Overview
In this demo, Scott Collier shows how to use Docker containers (the contents of an image and its features) to cat out contents of /etc/host, launch a web server, and bindmounting log files to see activity on host machines.

Comments
What's journalctl ? I was expecting you to show some logs under /var/log/
Hi Cameron and welcome to Red Hat Enterprise Linux 7. ;-)
The journalctl command is part of the systemd-journald service that handles how system log messages are gathered and stored for RHEL 7. Before RHEL 7, log message were sent directly to the rsyslog services which, by default, copied those messages into files in the /var/log directory.
In the video you just saw, the /dev/log device file on the host is bind mounted to that same device inside the container. So, when log messages are generated inside the container, they are picked up by the host systems's journal, from which they can be displayed by the journalctl command. As it turns out, however, the rsyslog service is running on RHEL 7 systems by default as well. So those same messages will be copied to files in that directory (in this case, in the /var/log/messages file).
The journalctl command is just the preferred way to view system log messages in RHEL 7. In fact, rsyslog does not run by default in Fedora at all and can, I believe, be disabled in RHEL without losing messages.