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< h1 id = "structured-logging" > < a class = "header" href = "#structured-logging" > Structured Logging< / a > < / h1 >
< p > A structured logging system can be useful when your logs are destined for a
machine to parse and process. By maintaining its machine-readable characteristics,
it enables more efficient searching and aggregations when consumed by software
such as the " ELK stack" .< / p >
< p > Synapse's structured logging system is configured via the file that Synapse's
< code > log_config< / code > config option points to. The file should include a formatter which
uses the < code > synapse.logging.TerseJsonFormatter< / code > class included with Synapse and a
handler which uses the above formatter.< / p >
< p > There is also a < code > synapse.logging.JsonFormatter< / code > option which does not include
a timestamp in the resulting JSON. This is useful if the log ingester adds its
own timestamp.< / p >
< p > A structured logging configuration looks similar to the following:< / p >
< pre > < code class = "language-yaml" > version: 1
formatters:
structured:
class: synapse.logging.TerseJsonFormatter
handlers:
file:
class: logging.handlers.TimedRotatingFileHandler
formatter: structured
filename: /path/to/my/logs/homeserver.log
when: midnight
backupCount: 3 # Does not include the current log file.
encoding: utf8
loggers:
synapse:
level: INFO
handlers: [remote]
synapse.storage.SQL:
level: WARNING
< / code > < / pre >
< p > The above logging config will set Synapse as 'INFO' logging level by default,
with the SQL layer at 'WARNING', and will log to a file, stored as JSON.< / p >
< p > It is also possible to configure Synapse to log to a remote endpoint by using the
< code > synapse.logging.RemoteHandler< / code > class included with Synapse. It takes the
following arguments:< / p >
< ul >
< li > < code > host< / code > : Hostname or IP address of the log aggregator.< / li >
< li > < code > port< / code > : Numerical port to contact on the host.< / li >
< li > < code > maximum_buffer< / code > : (Optional, defaults to 1000) The maximum buffer size to allow.< / li >
< / ul >
< p > A remote structured logging configuration looks similar to the following:< / p >
< pre > < code class = "language-yaml" > version: 1
formatters:
structured:
class: synapse.logging.TerseJsonFormatter
handlers:
remote:
class: synapse.logging.RemoteHandler
formatter: structured
host: 10.1.2.3
port: 9999
loggers:
synapse:
level: INFO
handlers: [remote]
synapse.storage.SQL:
level: WARNING
< / code > < / pre >
< p > The above logging config will set Synapse as 'INFO' logging level by default,
with the SQL layer at 'WARNING', and will log JSON formatted messages to a
remote endpoint at 10.1.2.3:9999.< / p >
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