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Logging

Zeebe uses Log4j2 framework for logging. In the distribution and the docker image you can find the default log configuration file in config/log4j2.xml.

Google Stackdriver (JSON) logging​

To enable Google Stackdriver compatible JSON logging you can set the environment variable ZEEBE_LOG_APPENDER=Stackdriver before starting Zeebe.

Default logging configuration​

  • config/log4j2.xml (applied by default)
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN" shutdownHook="disable">

  <Properties>
    <Property name="log.path">${sys:app.home}/logs</Property>
    <Property name="log.pattern">%d{yyyy-MM-dd HH:mm:ss.SSS} [%X{actor-name}] [%t] %-5level %logger{36} - %msg%n</Property>
    <Property name="log.stackdriver.serviceName">${env:ZEEBE_LOG_STACKDRIVER_SERVICENAME:-}</Property>
    <Property name="log.stackdriver.serviceVersion">${env:ZEEBE_LOG_STACKDRIVER_SERVICEVERSION:-}</Property>
  </Properties>

  <Appenders>
    <Console name="Console" target="SYSTEM_OUT">
      <PatternLayout
        pattern="${log.pattern}"/>
    </Console>

    <Console name="Stackdriver" target="SYSTEM_OUT">
      <StackdriverLayout serviceName="${log.stackdriver.serviceName}"
        serviceVersion="${log.stackdriver.serviceVersion}" />
    </Console>

    <RollingFile name="RollingFile" fileName="${log.path}/zeebe.log"
      filePattern="${log.path}/zeebe-%d{yyyy-MM-dd}-%i.log.gz">
      <PatternLayout>
        <Pattern>${log.pattern}</Pattern>
      </PatternLayout>
      <Policies>
        <TimeBasedTriggeringPolicy/>
        <SizeBasedTriggeringPolicy size="250 MB"/>
      </Policies>
    </RollingFile>
  </Appenders>

  <Loggers>
    <Logger name="io.zeebe" level="${env:ZEEBE_LOG_LEVEL:-info}"/>

    <Logger name="io.atomix" level="${env:ATOMIX_LOG_LEVEL:-warn}"/>

    <Root level="info">
      <AppenderRef ref="RollingFile"/>

      <!-- remove to disable console logging -->
      <AppenderRef ref="${env:ZEEBE_LOG_APPENDER:-Console}"/>
    </Root>
  </Loggers>

</Configuration>

Change log level dynamically​

Zeebe brokers expose a Spring Boot Actuators web endpoint for configuring loggers dynamically. To change the log level of a logger make a POST request to the /actuator/loggers/{logger.name} endpoint as shown in the example below. Change io.zeebe to the required logger name and debug to required log level.

curl 'http://localhost:9600/actuator/loggers/io.zeebe' -i -X POST -H 'Content-Type: application/json' -d '{"configuredLevel":"debug"}'