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Monitoring Service-Level Logs

The advantage of having per-service log files is that it is very easy to analyze/monitor what went wrong in this particular service (proxy service, data service etc.) by looking at the service log. Enabling this feature will not terminate the wso2carbon.log file. This file will contain the complete log with every log statement, including the service logs that you have configured to be logged into a different log file. In other words, the service log is an additional log file, which will contain a copy of the logs to that particular service.

Enabling log4j2 for a service

Follow the instructions below to enable log4j2 logs for a sample proxy service (named StockQuoteProxy).

1. Open up the log4j2.properties file (stored in the <MI_HOME>/conf directory. 

2. Let's define a new appender for the StockQuoteProxy service by adding the following section to the end of the file (starting in a new line).

   Note

   This configuration creates a log file named stock-quote-proxy-service.log in the <MI_HOME>/repository/logs folder.

   # SQ_PROXY_APPENDER is set to be a DailyRollingFileAppender using a PatternLayout.
   appender.SQ_PROXY_APPENDER.type = RollingFile
   appender.SQ_PROXY_APPENDER.name = SQ_PROXY_APPENDER
   appender.SQ_PROXY_APPENDER.fileName = ${sys:carbon.home}/repository/logs/stock-quote-proxy-service.log
   appender.SQ_PROXY_APPENDER.filePattern = ${sys:carbon.home}/repository/logs/stock-quote-proxy-service-%d{MM-dd-yyyy}.log
   appender.SQ_PROXY_APPENDER.layout.type = PatternLayout
   appender.SQ_PROXY_APPENDER.layout.pattern = TID: [%d] %5p {%c} [%logger] - %m%ex%n
   appender.SQ_PROXY_APPENDER.policies.type = Policies
   appender.SQ_PROXY_APPENDER.policies.time.type = TimeBasedTriggeringPolicy
   appender.SQ_PROXY_APPENDER.policies.time.interval = 1
   appender.SQ_PROXY_APPENDER.policies.time.modulate = true
   appender.SQ_PROXY_APPENDER.policies.size.type = SizeBasedTriggeringPolicy
   appender.SQ_PROXY_APPENDER.policies.size.size=10MB
   appender.SQ_PROXY_APPENDER.strategy.type = DefaultRolloverStrategy
   appender.SQ_PROXY_APPENDER.strategy.max = 20
   appender.SQ_PROXY_APPENDER.filter.threshold.type = ThresholdFilter
   appender.SQ_PROXY_APPENDER.filter.threshold.level = DEBUG

3. Register the appender (named SQ_PROXY_APPENDER):

   appenders = CARBON_CONSOLE, CARBON_LOGFILE, AUDIT_LOGFILE, SQ_PROXY_APPENDER, 

4. Define a new logger to filter out StockQuoteProxy related logs:

   logger.StockQuoteProxy.name = SERVICE_LOGGER.StockQuoteProxy
   logger.StockQuoteProxy.level = INFO
   logger.StockQuoteProxy.appenderRef.SQ_PROXY_APPENDER.ref = SQ_PROXY_APPENDER
   logger.StockQuoteProxy.additivity = false

   Info

   This particular logger is configured to rotate the file each minute whenever there is a log going into the service log.

5. Register the StockQuoteProxy logger:

   loggers = AUDIT_LOG, StockQuoteProxy, SERVICE_LOGGER,

6. Save the log4j2.properties file.

Configuring the proxy service

The log4j2 configurations in the log4j2.properties file does not create logs for the proxy service by default. Add a Log mediator to the proxy service's in-sequence and configure it to log messages at Full log level.

Dynamically changing log level

See the instructions on updating the log level.

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