logs.md

Log submission

For B1+B2/B3/B4 challenges, proof of runtime via logs is required.

There is fairly verbose logging enabled by default for the node software in Testnets, so we've created a small tool retrieve_minified_logs to sample your full set of log files and output a summary that is acceptable for submission.

• Download retrieve_minified_logs for Linux
• Download retrieve_minified_logs for OS X
• Download retrieve_minified_logs for Windows

Simply run the relevant binary on your system where the Concordium Node has been running. The tool will output two files in the folder it is run.

⚠️ These files must be submitted without modifications. Tampering with the summary log will be detected and result in disqualification from all challenges.

Log sizes & rotation

After running the node for a significant time you may find that you are running out of disk space on your node.

You can find your log file location by running:

docker inspect --format='{{.LogPath}}' <container_name_or_id>

Where the <container_name_or_id> is found by running docker ps -a.

⚠️ Make sure you generate log summaries for submission before clearing any logs!

You can then clear out your current logs via the command line:

# On OSX / Linux
truncate -s 0 <log_path>

# On Windows
echo.> <log_path>

Repeat this process if the log size gets too large again.

Make sure to submit all your log summaries if you're doing any of the B* challenges.