I am following the simple [Docker tutorial](http://wiki.ros.org/docker/Tutorials/Docker) and coming across "ERROR: Unable to communicate with master!". Here's the output : dparkar@dupin:~$ docker pull ros Using default tag: latest latest: Pulling from library/ros 6b98dfc16071: Pull complete 4001a1209541: Pull complete 6319fc68c576: Pull complete b24603670dc3: Pull complete 97f170c87c6f: Pull complete 979f74553e2f: Pull complete 2413da49cb9d: Pull complete 652985201ab5: Pull complete e828be34f7aa: Pull complete 308b41b91982: Pull complete f2de7c187505: Pull complete 76d678fbdf1b: Pull complete 8a4ec92e7e79: Pull complete 25e2b1ab5d6f: Pull complete Digest: sha256:842160e6c266f3853b190d7f10e223fcaf4f1ead1852976aa529082d0b0bbcb6 Status: Downloaded newer image for ros:latest dparkar@dupin:~$ docker run -it ros root@a245a8c57fbe:/# docker ps -l bash: docker: command not found root@a245a8c57fbe:/# source /opt/ros/melodic/setup.bash root@a245a8c57fbe:/# rostopic list ERROR: Unable to communicate with master! root@a245a8c57fbe:/# Appreciate any pointers. --- [Visit Topic](https://discourse.ros.org/t/docker-error-unable-to-communicate-with-master/5407/1) or reply to this email to respond. If you do not want to receive messages from ros-users please use the unsubscribe link below. If you use the one above, you will stop all of ros-users from receiving updates. ______________________________________________________________________________ ros-users mailing list ros-users@lists.ros.org http://lists.ros.org/mailman/listinfo/ros-users Unsubscribe: