<machine> in launch file does not work?

Question

I'm trying to launch the turtlebot_rviz_navigation from a launch file using the machine tag. The launch file exists on the robot and rviz will be run on a remote computer. Both have ROS installed and both can ssh into the other without any problems.
Here is my definition of the machine and the node:

<machine name="comp" address="[email protected]" user="comp" env-loader="/opt/ros/indigo/env.sh" />
          <node machine="comp" name="view_navigation" pkg="turtlebot_rviz_launchers" type="view_navigation.launch" output="screen" launch-prefix="xterm -e" />

/opt/ros/indigo/env.sh in the remote computer has the contents:

#!/usr/bin/env sh
. /opt/ros/indigo/setup.sh
exec "$@"

When I run the launch file I get the error: "cannot resolve host address for machine [[email protected] The traceback for the exception was written to the log file"

Any ideas?

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Originally posted by pgigioli on ROS Answers with karma: 354 on 2016-03-15

Post score: 0

Answer 1

Address should just be your IP address, no need for the username.

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Originally posted by alee with karma: 194 on 2016-03-15

This answer was ACCEPTED on the original site

Post score: 1

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Original comments

Comment by pgigioli on 2016-03-15:
I get the error: remote[192.168.1.11-0]: failed to launch on comp: 192.168.1.11 is not in your SSH known_hosts file. Please manually: ssh [email protected] then try roslaunching again.

Comment by alee on 2016-03-15:
Do as the error message says. After you ssh in the first time, it'll get added to your .ssh/known_hosts file. You can also manually add it yourself.

Comment by pgigioli on 2016-03-15:
I ssh'ed into [email protected] then exited and relaunched and got the same error. I have ssh'ed into my remote computer before. How do I manually add the IP to the known hosts file? "nano ~/.ssh/known_hosts" shows two illegible lines.

Comment by pgigioli on 2016-03-15:
Okay, I successfully added the address to my known_hosts file but now I get the error "error launching on [192.168.1.11-0, uri http://comp:57183/]: Name or service not known" for the node that I am trying to run through the ssh.

Comment by alee on 2016-03-15:
Hm. That doesn't seem right. It should look like ["username"-0, uri http://"ip":11311/]. Are you sure you put everything in the right order?

Comment by pgigioli on 2016-03-15:
Ah, I was trying to launch a launch file as a node instead of as an include. However, now I am getting the problem that I can't launch a launch file from a remote computer. The include argument only looks for files locally. Is there anyway to include a file from a remote computer?

Comment by alee on 2016-03-15:
I don't think so. However, you can launch nodes on a remote computer so you can launch a file locally that launches remote nodes. An example would be here: https://github.com/PR2/pr2_robot/blob/indigo-devel/pr2_bringup/config/kinect2_bridge.launch

Comment by pgigioli on 2016-03-15:
I tried to create a similar workaround by writing a .py node on the remote computer that will execute the desired file. Then I try to launch that .py node from the launch file using the declaration include the machine tag but I get the "Name or service not known" error