Scope

• JS7 makes use of Log4j2 for logging purposes. Log rotation is required to prevent log files from filling up disk space.
• The default configuration allows disk space consumption to be limited for each of Controller, Agent and JOC Cockpit.
• The configuration for rotating log files is similar for all JS7 components.
• Note that log output from orders and jobs in workflow is not stored with log files but is immediately added to the JS7 - Database and JS7 - History respectively.

Log4j2 Configuration

For the location of Log4j2 configuration files see JS7 - Log Files and Locations

Log Rotation Strategy

By default log files are rotated on the following events:

• if the size of a single log file exceeds 100MB or
• on day change.

If a log file is rotated then its name is appended the current date and a running number, in addition the log file is compressed, e.g. a log file controller.log becomes controller-2021-01-31-1.log.gz. The running number 1 indicates the first log file of the day being rotated.

Users are free to modify the Log4j2 configuration to apply their individual log rotation strategy, see the explanations for the examples below.

As an exception to this rule the watchdog log files for Controller and Agent are not subject to log rotation. The watchdog log file captures any output before the respective application is started, e.g. output of the Controller Windows Service, and therefore does not make use of Log4j2 for logging. The watchdog log files therefore should not grow but should report a few lines only in situations when a Controller or Agent could not be started.

Log Retention

By default the log retention period for any log files is 30 days and storage consumption of all log files is limited to 5GB. This translates to the fact that log files will be removed that are older than 30 days. If storage consumption exceeds 5GB then older log files will be removed too.

Users are free to modify the Log4j2 configuration to apply their individual log retention period, see below examples explained.

Log retention does not apply to:

• the audit.log log file, which is rotated but is not subject to log retention and therefore is not removed or truncated. For compliance reasons the audit.log remains in place for an arbitrary duration. It's the user's responsibility to purge the audit.log to their requirements.
• the watchdog.log files of Controller and Agent that hold any output created before the relevant application is started. 

Configuration Files explained

Controller and Agent Log4j2 Configuration

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN" shutdownHook="disable">
	<Properties>
		<Property name="TimeZone">${env:JS7_CONTROLLER_TZ:-Etc/UTC}</Property>
		<Property name="LogDir">${env:JS7_CONTROLLER_LOGS:-logs}</Property>
		<Property name="LogBasename">${env:JS7_CONTROLLER_APPNAME:-controller}</Property>
		
		<Property name="RetainDays">30d</Property>
		<Property name="MaxSizeOfRolledOverFiles">5GB</Property>
		<Property name="MaxSizePerFile">100MB</Property>
		
		<!-- Log level of the Root Logger. -->
		<Property name="RootLogLevel">INFO</Property>
		
		<!-- Configuration for a 2nd debug log file (OFF|DEBUG|TRACE) 
			 If this value is set to DEBUG or TRACE then the above 
			 RootLogLevel has to have the same value.
		-->
		<Property name="LogLevelOfDebugLog">OFF</Property>
		
	</Properties>
	
	<Appenders>
		<Console name="console" target="SYSTEM_ERR">
			<PatternLayout pattern="%highlight{%d{EE HH:mm:ss.SSS}{${TimeZone}} %-5level{INFO=info, DEBUG=debug, TRACE=trace} %logger - %message}{WARN=magenta}%n"/>
		</Console>
		
		<RollingRandomAccessFile name="fileInfo"
				fileName="${LogDir}/${LogBasename}.log"
				filePattern="${LogDir}/${LogBasename}-%d{yyyy-MM-dd}-%i.log.gz"
				immediateFlush="false">
			<PatternLayout pattern="%d{ISO8601}{${TimeZone}} %-5level{INFO=info, DEBUG=debug, TRACE=trace} %logger - %message%n"
					charset="UTF-8"/>
			<Policies>
				<TimeBasedTriggeringPolicy/>
				<SizeBasedTriggeringPolicy size="${MaxSizePerFile}"/>
			</Policies>
			<DefaultRolloverStrategy fileIndex="nomax">
				<Delete basePath="${LogDir}/" followLinks="true">
					<IfFileName glob="${LogBasename}-*.log.gz" >
						<IfAny>
							<IfLastModified age="${RetainDays}" />
							<IfAccumulatedFileSize exceeds="${MaxSizeOfRolledOverFiles}"/>
						</IfAny>
					</IfFileName>
				</Delete>
			</DefaultRolloverStrategy>
		</RollingRandomAccessFile>
		
		<RollingRandomAccessFile name="fileDebug"
				fileName="${LogDir}/${LogBasename}-debug.log"
				filePattern="${LogDir}/${LogBasename}-debug-%d{yyyy-MM-dd}-%i.log.gz"
				immediateFlush="false">
			<PatternLayout pattern="%d{ISO8601}{${TimeZone}} %-5level{INFO=info, DEBUG=debug, TRACE=trace} %logger - %message%n"
					charset="UTF-8"/>
			<Policies>
				<TimeBasedTriggeringPolicy/>
				<SizeBasedTriggeringPolicy size="${MaxSizePerFile}"/>
			</Policies>
			<DefaultRolloverStrategy fileIndex="nomax">
				<Delete basePath="${LogDir}/" followLinks="true">
					<IfFileName glob="${LogBasename}-*.log.gz" >
						<IfAny>
							<IfLastModified age="${RetainDays}" />
							<IfAccumulatedFileSize exceeds="${MaxSizeOfRolledOverFiles}"/>
						</IfAny>
					</IfFileName>
				</Delete>
			</DefaultRolloverStrategy>
		</RollingRandomAccessFile>
	</Appenders>
	
	<Loggers>
		<Logger name="spray" level="INFO"/>
		<Logger name="akka" level="INFO"/>
		<Logger name="akka.event.slf4j.Slf4jLogger" level="WARN"/>
		<Logger name="js7.common.akkahttp.web.auth.GateKeeper" level="ERROR"/>
		<Root level="${RootLogLevel}">
			<!--AppenderRef ref="console" level="ERROR"/-->
			<AppenderRef ref="fileInfo" level="INFO"/>
			<AppenderRef ref="fileDebug" level="${LogLevelOfDebugLog}"/>
		</Root>
	</Loggers>
</Configuration>

Explanation:

• The Log4j2 configuration file is the same for Controllers and Agents except for the fact that environment variables in lines 4-6 for Agents use:
  • <Property name="TimeZone">${env:JS7_AGENT_TZ:-Etc/UTC}</Property>
<Property name="LogDir">${env:JS7_AGENT_LOGS:-logs}</Property>
<Property name="LogBasename">${env:JS7_AGENT_APPNAME:-agent}</Property>
• To modify the time zone that is applied to log entries and to the point in time of log rotation modify <Property name="TimeZone">Etc/UTC</Property>. The time zone is specified by the Controller and Agent start scripts that set the environment variables JS7_CONTROLLER_TZ and JS7_AGENT_TZ respectively from the time zone reported by the operating system.
• To enable debug mode modify <property name="RootLogLevel">INFO</property> and <property name="LogLevelOfDebugLog">OFF</property> to DEBUG.
• To change the log retention period modify <Property name="RetainDays">30d</Property> to some other value. Note the use of the suffixes d(ays), w(eeks), m(onths).
• To limit the max. size of individual log files modify <Property name="MaxSizePerFile">100MB</Property> to some other value. Note the use of the units MB, GB.
• To limit storage consumption of all log files modify <Property name="MaxSizeOfRolledOverFiles">5GB</Property> to some other value. Note the use of the units MB, GB.

JOC Cockpit Log4j2 Configuration

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
	<Properties>
		<Property name="TimeZone">Etc/UTC</Property>
		<Property name="RetainDays">30d</Property>
		<Property name="MaxSizeOfRolledOverFiles">5 GB</Property>
		<Property name="MaxSizePerFile">100 MB</Property>
		
		<!-- Log level of the Root Logger. -->
		<Property name="RootLogLevel">INFO</Property>
		<!-- Configurations for 2nd debug log files (OFF|DEBUG|TRACE) 
			 If one of these values is set to DEBUG or TRACE then the above 
			 RootLogLevel has to have the same value.
		-->
		<Property name="JocLogLevel">OFF</Property>
		<Property name="ServiceClusterLogLevel">OFF</Property>
		<Property name="ServiceHistoryLogLevel">OFF</Property>
		<Property name="ServiceDailyPlanLogLevel">OFF</Property>
		<Property name="ServiceCleanupLogLevel">OFF</Property>
        <Property name="ServiceMonitorLogLevel">DEBUG</Property>
		<Property name="AuthLogLevel">OFF</Property>
		<Property name="ConnectionPoolLogLevel">OFF</Property>
	</Properties>
    <Appenders>
		<!-- Appender for audit log -->
		<RollingFile name="AuditLogAppender" 
			fileName="${sys:user.dir}/logs/audit.log" 
			filePattern="${sys:user.dir}/logs/audit-%d{yyyy-MM}-%i.log.gz"
			createOnDemand="true">
			<PatternLayout 
				pattern="%d{ISO8601}{${TimeZone}} %-5p %m%throwable{short}%n" 
				charset="UTF-8"/>
			<Policies>
				<TimeBasedTriggeringPolicy/>
				<SizeBasedTriggeringPolicy size="${MaxSizePerFile}"/>
			</Policies>
			<DefaultRolloverStrategy fileIndex="nomax"/>
		</RollingFile>

        <!-- Appender for connection pool log -->
            ...
    </Appenders>
        ...
<Configuration>

Explanation:

• To change the time zone that is applied to log entries and to the point in time of log rotation modify <Property name="TimeZone">Etc/UTC</Property>. The time zone is determined by the operating system during installation.
• To change the log retention period modify <Property name="RetainDays">30d</Property> to some other value. Note the use of the suffixes d(ays), w(eeks), m(onths).
• To limit storage consumption of all log files modify <Property name="MaxSizeOfRolledOverFiles">5 GB</Property> to some other value. Note the use of the units MB, GB.
• To limit the max. size of individual log files modify <Property name="MaxSizePerFile">100 MB</Property> to some other value. Note the use of the units MB, GB.
• To enable debug mode modify <property name="RootLogLevel">INFO</property> to DEBUG. In addition modify the value of one or more of the following properties to enable debug output with the respective debug log file: 

  
  

  Debug Log File	Property
  joc-debug.log	<Property name="JocLogLevel">DEBUG</Property>
  service-cluster-debug.log	<Property name="ServieClusterLogLevel">DEBUG</Property>
  service-history-debug.log	<Property name="ServieHistoryLogLevel">DEBUG</Property>
  service-dailyplan-debug.log	<Property name="ServiceDailyPlanLogLevel">DEBUG</Property>
  service-cleanup-debug.log	<Property name="ServiceCleanupLogLevel">DEBUG</Property>
  service-monitor-debug.log	<Property name="ServiceMonitorLogLevel">DEBUG</Property>
  authentication-debug.log	<Property name="AuthLogLevel">DEBUG</Property>
  connection-pool-debug.log	<Property name="ConnectionPoolLogLevel">DEBUG</Property>