Unable to setup Kinetic on docker

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Hello all,

I'm working on having a docker container to use later on the robot. My approach is to have a multiple machine setup where the master is in the container and Gazebo and all sorts of other GUI intensive stuff can work from outside the container.

So I started by following the Multiple Machines tutorial inside the container (just to see how far I could get). It turns out that if I start a roscore on one bash and call rosrun from another they do not hear each other.

According to docker documentation,

you can supply -P or --publish-all=true|false to docker run which is a blanket operation that identifies every port with an EXPOSE line in the image’s Dockerfile

sudo docker run -P -it osrf/ros:kinetic-desktop-xenial Start docker container (using -P )
roscore It went straight into the container so this is already inside the container, on the first bash
docker exec -it <name> this is done in another terminal to open another bash for the same container
Here name is just a placeholder for the name of the container (like optimistic_aryabhata)
Inside this second bash, I set up for the tutorial

source /opt/ros/$ROS_DISTRO/setup.bash
apt-get update
apt-get install wget
wget http://packages.ros.org/ros.key -O - |  apt-key add -
apt-get update
apt-get install python-catkin-tools

And follow the tutorial instructions for multiple machines

export ROS_MASTER_URI=http://<name>:11311
rosrun rospy_tutorials listener.py

The last command gives me

Unable to register with master node [http://<name>:11311]: master may not be running yet. Will keep trying.

I was asked what was the ROS_HOSTNAME. I was not aware of the ROS_IP / ROS_HOSTNAME environmental variables. Neither is set. (I'm exploring this right now)

Another question was about NetworkSetup. I did not follow this tutorial yet under the assumption that first I need to be able to make roscore discoverable between terminals of the same machine to go into this part of the setup.