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Logging Configuration


There are two ways in which you can configure logging for Galaxy servers:

  1. Basic/automatic configuration with control over log level and log destination (standard output or a named log file).

  2. More complex configuration using the Python logging module’s logging.config.dictConfig() or logging.config.fileConfig().

By default, Galaxy logs all messages to standard output at the DEBUG logging level, unless the --daemon argument is passed to run.sh, in which case, output is logged to a location configured in `gravity`_.

Gravity and related terminology are explained in detail in the Scaling and Load Balancing documentation.

Basic Configuration

Basic logging configuration can be used to modify the level of log messages and the file to which Galaxy logs. The level is controlled by the log_level configuration option.

If not set, Galaxy logs all messages at the DEBUG level (versions prior to 18.01 defaulted to INFO if unset, but the default config file shipped with log_level explicitly set to DEBUG for development purposes).

Galaxy logs all messages to standard output by default if running in the foreground. If running in the background, the log is written to a location configured in `gravity`_.

Setting the log level:

In galaxy.yml, set log_level:

    log_level: LEVEL

Where LEVEL is one of the logging levels documented in the logging module.

Logging to a file:

To change the log file name or location, use the $GALAXY_LOG environment variable like so:

$ GALAXY_LOG=/path/to/galaxy/logfile sh run.sh --daemon

Advanced Configuration

For more useful and manageable logging when running Galaxy with forking application stacks where multiple Galaxy server processes are forked after the Galaxy application is loaded, a custom filename_template config option is available to logging.FileHandler (or derivative class) log handler definitions so that multiple file logging is possible. Without this custom option, all forked Galaxy server processes would only be able to log to a single combined log file, which can be very difficult to work with.


Advanced logging configuration is performed under the logging key in the galaxy section of galaxy.yml. The syntax is a YAML dictionary in the syntax of Python’s logging.config.dictConfig(). This section covers a few of the most common configurations as well as Galaxy’s customizations. Consult the logging.config.dictConfig() documentation for a complete explanation of the syntax and possibilities.


The default as of this Galaxy release can be found (in Python syntax) in the galaxy.config.LOGGING_CONFIG_DEFAULT constant and (in YAML) below:

    disable_existing_loggers: false
        (): galaxy.web_stack.application_stack_log_filter
        (): galaxy.web_stack.application_stack_log_formatter
        class: logging.StreamHandler
        - stack
        formatter: stack
        level: DEBUG
        stream: ext://sys.stderr
        level: INFO
        qualname: amqp
        level: INFO
        qualname: botocore
        level: WARN
        qualname: paste.httpserver.ThreadPool
        level: WARN
        qualname: routes.middleware
        level: WARN
        qualname: sqlalchemy_json.track
        level: WARN
        qualname: urllib3.connectionpool
      - console
      level: DEBUG
    version: 1