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synapse/docs/sample_log_config.yaml
Erik Johnston 0304ad0c3d Move setting of Filter into code.
We do this to prevent foot guns. The default config uses a MemoryFilter,
but users are free to change to logging to files directly. If they do
then they have to ensure to set the `filters: [context]` on the right
handler, otherwise records get written with the wrong context.

Instead we move the logic to happen when we generate a record, which is
when we *log* rather than *handle*.

(It's possible to add filters to loggers in the config, however they
don't apply to descendant loggers and so they have to be manually set on
*every* logger used in the code base)
2020-08-11 18:10:46 +01:00

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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.
#
# [1]: https://docs.python.org/3.7/library/logging.config.html#configuration-dictionary-schema
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. This means that
# will be a delay for INFO/DEBUG logs to get written, but WARNING/ERROR
# logs will still be flushed immediately.
buffer:
class: logging.handlers.MemoryHandler
target: file
# The capacity is the 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.
capacity: 10
flushLevel: 30 # Flush for WARNING logs as well
# 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 configuation for the `twisted` logger above, in
# this case.)
#
handlers: [buffer]
disable_existing_loggers: false