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logging-configuration.md

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Logging Configuration

Log config file location

Logging in Nethermind is done via NLog library that can be configured by editing the NLog.config file.

Environment Type NLog.config location
built from src - Debug mode src\Nethermind\Nethermind.Runner\bin\Debug\netcoreapp3.1\NLog.config
built from src - Release mode src\Nethermind\Nethermind.Runner\bin\Release\netcoreapp3.1\NLog.config
Docker /nethermind/NLog.config
from downloads page top level directory after unzipping the package
from GitHub releases page top level directory after unzipping the package
dAppNode ? [to be documented]

Log config file syntax

Detailed NLog configuration options can be found here: https://nlog-project.org/config/

Global logging override

Additionally there are global logging override that you can use temporarily:

Command line override Log level
./Nethermind.Runner --config mainnet --log TRACE TRACE
./Nethermind.Runner --config mainnet --log DEBUG DEBUG
./Nethermind.Runner --config mainnet --log INFO INFO
./Nethermind.Runner --config mainnet --log WARN WARN
./Nethermind.Runner --config mainnet --log ERROR ERROR

JSON RPC logging level

This can be done by including these lines in the logging configuration file:

<logger name="JsonRpc.*" minlevel="Error" writeTo="file-async"/>
<logger name="JsonRpc.*" minlevel="Error" writeTo="auto-colored-console-async" final="true"/>
<logger name="JsonRpc.*" final="true"/>

Enterprise Logging

See how to configure Seq here