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Jul 6, 2020
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Update for supporting multiple logging level settings #290

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Update for supporting multiple logging level settings
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15 changes: 12 additions & 3 deletions articles/150_ros_command_line_arguments.md
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Expand Up @@ -167,16 +167,25 @@ another_node:
string_param: bar
```

#### Logging level
#### Logging level assignments

Minimum logging level can be externally set using the `--log-level` option.
Minimum logging level can be externally set either globally or per logger using the `--log-level` option.

As an example, to set logging level to `DEBUG` for `some_ros_executable`, one may execute:
As an example, to set a global logging level to `DEBUG` for `some_ros_executable`, one may execute:

```sh
ros2 run some_package some_ros_executable --ros-args --log-level DEBUG
```

Loggers can be set using the `--log-level` option as well:

```sh
ros2 run some_package some_ros_executable --ros-args --log-level talker1:=DEBUG --log-level talker2:=WARN --log-level rclcpp:=DEBUG
```

The minimum logging level of a specific logger will override the globally specified minimum logger level.
If a logging level is specified more than once in the passed command line arguments, the last one prevails.

See `rcutils` and `rcl` logging documentation for reference on existing logging levels.

#### External logging configuration
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