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Afaik, the implementation of the default logger (spdlog) does not currently support custom log configuration: https://github.com/ros2/rcl_logging/blob/galactic/rcl_logging_spdlog/src/rcl_logging_spdlog.cpp#L73

If you compile ROS2 from source, you can use log4cxx instead, which does support external configuration. There are however a number of other issues with that (which is why the default logging system was changed to spdlog).

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