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                        <h1 id="logging-sample-configuration-file"><a class="header" href="#logging-sample-configuration-file">Logging Sample Configuration File</a></h1>
<p>Below is a sample logging configuration file. This file can be tweaked to control how your
homeserver will output logs. A restart of the server is generally required to apply any
changes made to this file. The value of the <code>log_config</code> option in your homeserver
config should be the path to this file.</p>
<p>Note that a default logging configuration (shown below) is created automatically alongside
the homeserver config when following the <a href="../../setup/installation.html">installation instructions</a>.
It should be named <code>&lt;SERVERNAME&gt;.log.config</code> by default.</p>
<pre><code class="language-yaml"># Log configuration for Synapse.
#
# This is a YAML file containing a standard Python logging configuration
# dictionary. See [1] for details on the valid settings.
#
# Synapse also supports structured logging for machine readable logs which can
# be ingested by ELK stacks. See [2] for details.
#
# [1]: https://docs.python.org/3.7/library/logging.config.html#configuration-dictionary-schema
# [2]: https://matrix-org.github.io/synapse/latest/structured_logging.html

version: 1

formatters:
    precise:
        format: '%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s - %(message)s'

handlers:
    file:
        class: logging.handlers.TimedRotatingFileHandler
        formatter: precise
        filename: /var/log/matrix-synapse/homeserver.log
        when: midnight
        backupCount: 3  # Does not include the current log file.
        encoding: utf8

    # Default to buffering writes to log file for efficiency.
    # WARNING/ERROR logs will still be flushed immediately, but there will be a
    # delay (of up to `period` seconds, or until the buffer is full with
    # `capacity` messages) before INFO/DEBUG logs get written.
    buffer:
        class: synapse.logging.handlers.PeriodicallyFlushingMemoryHandler
        target: file

        # The capacity is the maximum number of log lines that are buffered
        # before being written to disk. Increasing this will lead to better
        # performance, at the expensive of it taking longer for log lines to
        # be written to disk.
        # This parameter is required.
        capacity: 10

        # Logs with a level at or above the flush level will cause the buffer to
        # be flushed immediately.
        # Default value: 40 (ERROR)
        # Other values: 50 (CRITICAL), 30 (WARNING), 20 (INFO), 10 (DEBUG)
        flushLevel: 30  # Flush immediately for WARNING logs and higher

        # The period of time, in seconds, between forced flushes.
        # Messages will not be delayed for longer than this time.
        # Default value: 5 seconds
        period: 5

    # A handler that writes logs to stderr. Unused by default, but can be used
    # instead of &quot;buffer&quot; and &quot;file&quot; in the logger handlers.
    console:
        class: logging.StreamHandler
        formatter: precise

loggers:
    synapse.storage.SQL:
        # beware: increasing this to DEBUG will make synapse log sensitive
        # information such as access tokens.
        level: INFO

    twisted:
        # We send the twisted logging directly to the file handler,
        # to work around https://github.com/matrix-org/synapse/issues/3471
        # when using &quot;buffer&quot; logger. Use &quot;console&quot; to log to stderr instead.
        handlers: [file]
        propagate: false

root:
    level: INFO

    # Write logs to the `buffer` handler, which will buffer them together in memory,
    # then write them to a file.
    #
    # Replace &quot;buffer&quot; with &quot;console&quot; to log to stderr instead. (Note that you'll
    # also need to update the configuration for the `twisted` logger above, in
    # this case.)
    #
    handlers: [buffer]

disable_existing_loggers: false
</code></pre>

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