.bashrc: https://gist.github.com/tik0/0c6d1598...

Errata:

1. local writable folder can be mounted under '/media/localdisk/data' instead of '/media/localdisk/userdata'

2. environment variables in .bashrc needs to be exported by writing 'export' in front of it

2.1 e.g. 'export GAZEBO_MASTER_URI="http://127.0.0.1:11345"' instead of GAZEBO_MASTER_URI=http://127.0.0.1:11345'

2.2. e.g. 'export ROS_MASTER_URI="http://$(hostname):11311"' instead of 'ROS_MASTER_URI="http://$(hostname):11311"'