How to kill nodes in ROS2?

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Can confirm, there is no feature to kill nodes remotely. This feature was related to enforcing node name uniqueness (duplicate names would cause one of the nodes to be killed), but we haven't addressed that yet.

@gvdhoorn It does not work in my system. I do ros2 node list which gives me /pp/cam0. Then I do ros2 lifecycle set /pp/cam0 shutdown and the response is Node not found. Any idea how to fix this?

I have no idea.

I would suggest to first make sure /pp/cam0 is actually a lifecycle node. If it isn't, then ros2 lifecycle is not going to be of any help.

@gvdhoorn Thanks! Does that mean that there is no command in ROS2 foxy to shut down a node if the node does not have its lifecycle implemented? Nothing has really changed since May 2019 when you answered this question?

Nothing has really changed since May 2019 when you answered this question?

well, 'nothing' is a bit strong, but I don't believe there is a "kill node" command in ROS 2 in general, and I doubt it will ever be added.

See the rationale added by @William.

Killing nodes is process management, which is something the OS does best. ROS should not duplicate that (unloading components is something else).