This guide describes how to capture logs to a file and search through the file for important events.

Log file configuration

The lotus-miner process generates Go logs and Rust logs. Both of these can be redirected to individual files.

Redirect Go logs to a file

By default, lotus-miner redirect all logs to the standard output if not running as a systemd service. To change this behavior, add the following variable to the .bashrc file and restart the Lotus miner process to start redirecting all logs to the file.

export GOLOG_OUTPUT=FILE >> ~/.bashrc
export GOLOG_FILE="$HOME/miner.log" >> ~/.bashrc && source ~/.bashrc

Redirect Rust logs to a standard output

By default the fil_logger library used by rust-fil-proof doesn’t log anything. You can change this by setting the RUST_LOG environment variable to another level. This will show log output on stderr which can be redirected to a file in the shell while launching the lotus-miner command.

export RUST_LOG=info >> ~/.bashrc && source ~/.bashrc

The log-level can be chosen between 5 options:

  • trace
  • debug
  • info
  • warn
  • error

Change logging verbosity

The verbosity of the lotus and lotus-miner logs can be changed without restarting the lotus. The following command can be used to list different subsystems within the lotus-miner process and change the verbosity of individual subsystem to get more/less detailed logs.

lotus-miner log list

To change the verbosity, please run:

lotus-miner log set-level --system chain debug

The log-level can be chosen between 4 options:

  • debug
  • info
  • warn
  • error

You can specify multiple subsystems to change the log level of multiple subsystems at once.

lotus-miner log set-level --system chain --system chainxchg debug

Searching through logs

  1. To look for logs related to mining a block, you can check with following commands.

    cat /path/to/log | grep "mined"
  2. To look for logs related to winning a block, you can check with following commands.

    cat /path/to/log | grep "isEligible"

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