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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.< / p >
< p > Note that the contents below are < em > not< / em > intended to be copied and used as the basis for
a real homeserver.yaml. Instead, if you are starting from scratch, please generate
a fresh config using Synapse by following the instructions in
< a href = "../../setup/installation.html" > Installation< / a > .< / 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
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# [2]: https://matrix-org.github.io/synapse/latest/structured_logging.html
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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
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# 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.
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buffer:
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class: synapse.logging.handlers.PeriodicallyFlushingMemoryHandler
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target: file
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# The capacity is the maximum number of log lines that are buffered
# before being written to disk. Increasing this will lead to better
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# performance, at the expensive of it taking longer for log lines to
# be written to disk.
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# This parameter is required.
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capacity: 10
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# 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
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# A handler that writes logs to stderr. Unused by default, but can be used
# instead of " buffer" and " file" 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 " buffer" logger. Use " console" 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 " buffer" with " console" 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
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