Parameters Still Exists After Shutting Down All Nodes In Docker?

Question

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It does make sense to me that the built-in parameter server should not persist after shutting down the ROS Master.

However, I am only using the built-in ROS parameter server, and I can still see parameters and their values after I shut down all nodes launched by a single launch file (by Ctrl-C).

Then, to see if the ROS Master has really been shut down, I used $rostopic list and saw \rosout and several other topics. However I could not get anything from \rosout when I tried to echo it. Therefore, I am not sure if the ROS Master has really been shut down.

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Originally posted by RicoJ on ROS Answers with karma: 41 on 2020-09-11

Post score: 0

Answer 1

Parameters Still Exists After Shutting Down All Nodes In Docker?

if your question is Do parameters still exist after shutting down all nodes?, then the answer would be: yes.

The parameter server is part of the Master, so it doesn't matter whether you have nodes running or not.

Docker does not change anything here (unless you have your Master running inside a container and you've shut down that container).

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Originally posted by gvdhoorn with karma: 86574 on 2020-09-11

This answer was ACCEPTED on the original site

Post score: 2

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Original comments

Comment by RicoJ on 2020-09-12:
Nice! Now the question is if Master has really been shutdown by hitting CTRL-C or not. Please see here