Logs

Logging with the spatial command-line tool

spatial outputs information to two places: to the console and to spatial.log (in the current working directory).

The console

By default, the console shows information messages, warnings and errors. You can increase or decrease the amount of information shown in the console by adding the --log_level option.

For example, use --log_level=warn to show only warnings and errors in the console.

The log files

The log files (for example logs/spatial_<date_time>.log) show information messages, warnings, errors, and additional debugging information. They always contain all this information, regardless of the --log_level value you use in the console. Each file contains all the logs for a given spatial invocation. We keep the 20 most recent log files.

If you ask on the forums about a problem, make sure you send your log file along with your question.

Changing log file location

You can change the location of the log files using the --log_directory command line option. Set the value to be the path to the directory you want to use. For example:

spatial worker build --log_directory=./temp

Cloud deployments

For cloud deployments, SpatialOS outputs all logs to a web-based logging interface available from each deployment’s overview page:

This interface provides an easy way to explore logs:

To filter by time, select part of the timeline:

Or click on the start or end date to open a more detailed time period picker:

Drag a section of the timeline to filter by time, and use the sidebar to filter by:

• Message contents
• Log level: INFO, WARN, ERROR
• node_name
• logger_name

Each log can then be expanded and its contents copied.

Finally, note the nifty Gmail-like keyboard shortcuts!

Launcher logs

Logs for the Launcher can be found at:

• Windows - C:\Users{username}\AppData\Roaming\SpatialOS\Launch\logs
• Mac - /Users/{username}/Library/Application Support/SpatialOS/Launch/logs

Interpreting logs

The logs have entries of levels Info, Warning, and Error. Roughly, these mean:

• Error

  These always indicate something going wrong. A single log entry of this type should be grounds for concern and should be investigated and resolved.

• Warning

  These indicate that, possibly temporarily, the application was in an unexpected state. However, the application is intended to recover from these states autonomously. As such, warnings are only cause for concern if they are sustained over time, or if they occur together with errors.

• Info

  These don’t indicate that anything is going wrong and shouldn’t be cause for concern. By default, these aren’t shown when running locally. You can turn the log level up or down by passing -DFABRIC_LOG_LEVEL=<level> as a JVM argument when running locally, where <level> is one of DEBUG, INFO, WARN, or ERROR.

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