ssh rviz: cannot connect to X server

rivz

asked 2016-06-13 05:09:39 -0600

yongqi
37 ●4 ●8 ●10

updated 2016-06-13 05:12:58 -0600

hi, I am using indigo in ubuntu14.04.2. I am trying to connect my desktop computer(zyq.local) and another computer(thinker.local). I can ping them from each one, and I have set the hostname and host_master_uri like this: in my desktop computer:

export ROS_HOSTNAME=zyq.local
export ROS_MASTER_URI=http://thinker.local:11311

in another:

export ROS_HOSTNAME=thinker.local

then I login the robot computer through ssh

ssh thinker.local -l think
roscore &
roslaunch rbx1_bringup fake_pi_robot.launch

after this I open another terminal in my desktop computer an connect robot computer again

ssh thinker.local -l think
rosrun rviz rviz -d `rospack find rbx1_nav`/sim.rviz

now error occurs:rviz: cannot connect to X server I do not why, two computers can ping each other. Thanks.

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answered 2016-06-13 07:20:17 -0600

Mario Garzon

802 ●9 ●24 ●26 https://sites.google.c...

By default a ssh connection does not allow any graphical interface to be displayed. To allow this you have to add the -X argument to the connection.

It should be something like

ssh -X thinker.local -l think

Then you will be able to open any GUI.

Regards,

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thanks, it works.I have another question.When I control the robot through desktop computer without ssh like thiszyq@zyq:~$ rosrun rviz rviz -drospack find rbx1_nav/sim.rviz, it told me [rospack] Error: package 'rbx1_nav' not found. But I have set the HOSTNAME and URI, what should I do thanks

yongqi ( 2016-06-13 09:42:33 -0600 )edit

This is because probably you don't have the rbx1_nav package on your desktop computer. Maybe just run rviz rosrun rviz rviz and then add the displays manually

Mario Garzon ( 2016-06-13 12:16:01 -0600 )edit

no, I don't have this package. But I have it in my robot computer, I want to add the displays manually on my desktop computer while don't use ssh. Can this be achieved? If not, I don't know what is the HOST_MASTER_URI used for(I have set it http://thinker.local:11311 ). Thanks very much.

yongqi ( 2016-06-13 18:45:47 -0600 )edit

Yes, you can manually add the displays in your desktop computer. The ROS_MASTER_URI variable is used to tell ROS that the roscore is running on your robot computer, and therefore being able to read the topics on that computer.

Mario Garzon ( 2016-06-14 06:45:02 -0600 )edit

Thanks a lot

yongqi ( 2016-06-14 19:03:36 -0600 )edit

hello，I have got the same issue, and after I used the command 'ssh -X .....', the issue was still here. What could be the issue ? Can you please help me?

Dhuzi ( 2023-03-29 02:15:13 -0600 )edit

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answered 2016-06-13 07:18:33 -0600

JohnDoe2991
305 ●3 ●5 ●15

You forgot to enable X11 Forwarding. Try to use

ssh -X thinker.local -l think
rosrun rviz rviz -d `rospack find rbx1_nav`/sim.rviz

Note: -X (upper case) enables X11 Forwarding whereas -x (lower case) disables it.

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