Very simple log4j2 properties configuration file using Console and Rolling File appender - log4j

Question

I'd like a log4j2 properties file configuration with a console and a rolling file appender using log4j2 that can be used different application. The log configuration should rotate the log in production environment.

Answer 1

I think there is no such industry standard for logging or log4j2 configuration. Everyone change the configuration as per the need of the application.
Below is one sample log4j2 configuration file having ConsoleAppender and RollingFileAppender -
status = warn
name= properties_configuration
# Give directory path where log files should get stored
property.basePath = ./log/
# ConsoleAppender will print logs on console
appender.console.type = Console
appender.console.name = consoleLogger
appender.console.target = SYSTEM_OUT
appender.console.layout.type = PatternLayout
# Specify the pattern of the logs
appender.console.layout.pattern = %d{yyyy-MM-dd HH:mm:ss.SSS} %level [%t] [%c] [%M] [%l] - %msg%n
# RollingFileAppender will print logs in file which can be rotated based on time or size
appender.rolling.type = RollingFile
appender.rolling.name = fileLogger
appender.rolling.fileName= ${basePath}app.log
appender.rolling.filePattern= ${basePath}app_%d{yyyyMMdd}.log.gz
appender.rolling.layout.type = PatternLayout
appender.rolling.layout.pattern = %d{yyyy-MM-dd HH:mm:ss.SSS} %level [%t] [%c] [%M] [%l] - %msg%n
appender.rolling.policies.type = Policies
# Rotate log file each day and keep 30 days worth
appender.rolling.policies.time.type = TimeBasedTriggeringPolicy
appender.rolling.policies.time.interval = 1
appender.rolling.policies.time.modulate = true
appender.rolling.strategy.type = DefaultRolloverStrategy
appender.rolling.strategy.delete.type = Delete
appender.rolling.strategy.delete.basePath = ${basePath}
appender.rolling.strategy.delete.maxDepth = 1
appender.rolling.strategy.delete.ifLastModified.type = IfLastModified
# Delete files older than 30 days
appender.rolling.strategy.delete.ifLastModified.age = 30d
# Mention package name here in place of example. Classes in this package or subpackages will use ConsoleAppender and RollingFileAppender for logging
logger.example.name = example
logger.example.level = debug
logger.example.additivity = false
logger.example.appenderRef.rolling.ref = fileLogger
logger.example.appenderRef.console.ref = consoleLogger
# Configure root logger for logging error logs in classes which are in package other than above specified package
rootLogger.level = error
rootLogger.additivity = false
rootLogger.appenderRef.rolling.ref = fileLogger
rootLogger.appenderRef.console.ref = consoleLogger

Answer 2

Try this out:
# Declare loggers
name=LoggingConfig
appenders=a_console, a_rolling
rootLogger.level=info
rootLogger.appenderRefs=ar_console,ar_rolling
rootLogger.appenderRef.ar_console.ref=StdoutAppender
rootLogger.appenderRef.ar_rolling.ref=DailyRollingAppender
# Console logger
appender.a_console.type=Console
appender.a_console.name=StdoutAppender
appender.a_console.layout.type=PatternLayout
appender.a_console.layout.pattern=%d{ISO8601} [%t] %-5p (%F\:%L) - %m%n
# File logger
appender.a_rolling.type=RollingFile
appender.a_rolling.name=DailyRollingAppender
appender.a_rolling.layout.pattern=%d{ISO8601} [%t] %-5p (%F\:%L) - %m%n
appender.a_rolling.fileName=log4j2-sample.log
appender.a_rolling.filePattern=log4j2-sample-%d{yyyy-MM-dd}.log
appender.a_rolling.layout.type=PatternLayout
appender.a_rolling.policies.type=Policies
appender.a_rolling.policies.time.type=TimeBasedTriggeringPolicy
appender.a_rolling.policies.time.interval=1

Answer 3

This is the simplest config if you just need to use console appender.
name=config
appenders=console
appender.console.type=Console
appender.console.name=STDOUT
appender.console.layout.type=PatternLayout
#appender.console.layout.pattern =%d{HH:mm:ss} [%t] %c{1} [%-5level] - %msg%n
appender.console.layout.pattern=%d{dd-MM-yyyy HH:mm:ss} [%-5p] (%F:%L) - %m%n
rootLogger.level=info
rootLogger.appenderRefs=stdout
rootLogger.appenderRef.stdout.ref=STDOUT
#if you want to make package specific configuration
#logger.org.apache=warn