In ROS 2 the parameters are implementing within the node.
Each node can have local parameters but needs a "parameter server" to allow remote nodes to modify them. We haven't propagated the parameter service to all our nodes as we expect it to be started automatically in he future.
You can see minimal example of node running the parameter service [here](
https://github.com/ros2/demos/blob/79c2f5ac6d904a8a0bb98f5fd23a210d6886682c/demo_nodes_cpp/src/parameters/parameter_node.cpp)
Hope this helps
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