[ros-users] [Discourse.ros.org] [Packaging and Release Management/Indigo] Docker : Error : Unable to communicate with master!

[Dhawal Parkar]

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 at 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 at dupin:~$ docker run -it ros
root at a245a8c57fbe:/# docker ps -l
bash: docker: command not found
root at a245a8c57fbe:/# source /opt/ros/melodic/setup.bash
root at a245a8c57fbe:/# rostopic list
ERROR: Unable to communicate with master!
root at a245a8c57fbe:/# 

Appreciate any pointers.





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