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How can I configure Logback to log different levels for a logger to different destinations?
(12 answers)
Closed 6 years ago.
I'd like to define a logback configuration file that will be able to :
log DEBUG (and higher) things in debug.log
log INFO (and higher) things in info.log
That is to say, when I call :
logger.warn("blah"); // Logs to both info.log and debug.log
logger.debug("bleh"); // Logs to debug.log only
Is it possible ?
I tried something like this, but it seems like when logback encounters multiple <root> tags, it only takes the last one :
<appender name="infoFile" class="ch.qos.logback.core.rolling.RollingFileAppender">
<File>${LOGS_FOLDER}/info.log</File>
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<appender name="debugFile" class="ch.qos.logback.core.rolling.RollingFileAppender">
<File>${LOGS_FOLDER}/debug.log</File>
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="infoFile" />
</root>
<root level="DEBUG">
<appender-ref ref="debugFile" />
</root>
Here, info.log contains debug-level logs :(
Note that I want to apply this behaviour on every of my packages.
Using a levelFilter solved the problem
Example :
<appender name="infoFile" class="ch.qos.logback.core.rolling.RollingFileAppender">
<File>${LOGS_FOLDER}/info.log</File>
<filter class="ch.qos.logback.classic.filter.LevelFilter">
<level>INFO</level>
<onMatch>ACCEPT</onMatch>
<onMismatch>DENY</onMismatch>
</filter>
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<appender name="debugFile" class="ch.qos.logback.core.rolling.RollingFileAppender">
<File>${LOGS_FOLDER}/debug.log</File>
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<root level="DEBUG"><!-- Using the lowest level here -->
<appender-ref ref="debugFile" />
<appender-ref ref="infoFile" />
</root>
Related
I have really basic logback configuration:
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>
%date %-5level [%thread] - [%logger] - [someArg:%X{someArg}] - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="CONSOLE"/>
</root>
I don't want to paste someArg from MDC for each application logs, how can I omit it if someArgs not exists?
You can use replace omit it if someArgs not exists.
like this:
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>
%date %-5level [%thread] - [%logger] %replace(- [someArg:%X{someArg}] ){'- \[someArg:\] ',''}- %msg%n
</pattern>
</encoder>
</appender>
I am working on a project in which I am logging bunch of stuff in a file and I want to make sure my log file is getting rolled as soon as a fixed limit for file is reached. I have a below logback.xml file but it looks like file size is not working. I see my file size as 793M but limit I have is 100M
<configuration>
<appender name="FILE" class="ch.qos.logback.core.FileAppender">
<file>process.log</file>
<triggeringPolicy
class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<maxFileSize>100MB</maxFileSize>
</triggeringPolicy>
<rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
<fileNamePattern>process%i.log</fileNamePattern>
<minIndex>1</minIndex>
<maxIndex>9</maxIndex>
</rollingPolicy>
<encoder>
<pattern>%date %level [%thread] %msg%n</pattern>
<!-- this improves logging throughput -->
<immediateFlush>true</immediateFlush>
</encoder>
</appender>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<!-- encoders are assigned the type ch.qos.logback.classic.encoder.PatternLayoutEncoder
by default -->
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="FILE" />
<appender-ref ref="STDOUT" />
</root>
</configuration>
What wrong I am doing here? And also what is the best policy we should follow in production in terms of logging? We are logging bunch of stuff in a file and we don't want to fill up the disk with this log file.
Instead of FileAppender, you should be using a RollingFileAppender.
See: http://logback.qos.ch/manual/appenders.html
You are specifying settings/properties that are intended to be used by the RollingFileAppender and are ignored by FileAppender.
For a good example usage and configuration, refer to this link:
http://examples.javacodegeeks.com/enterprise-java/logback/logback-rollingfileappender-example/
Sample logback.xml using a RollingFileAppender and ConsoleAppender. The RollingFileAppender is both size and time based:
<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true">
<appender name="consoleAppender" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<charset>UTF-8</charset>
<Pattern>%d %-4relative [%thread] %-5level %logger{35} - %msg%n</Pattern>
</encoder>
</appender>
<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>/srv/logs/application.log</file>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>logFile.%d{yyyy-MM-dd}.log</fileNamePattern>
<maxHistory>30</maxHistory>
</rollingPolicy>
<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<maxFileSize>5MB</maxFileSize>
</triggeringPolicy>
<encoder>
<charset>UTF-8</charset>
<pattern>%d %-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
</encoder>
</appender>
<root level="DEBUG">
<appender-ref ref="consoleAppender" />
<appender-ref ref="FILE"/>
</root>
</configuration>
I want to customize my logback.xml file for 3 levels (error,debug,info) .I do like this :
<configuration>
<appender name="FILE-ERROR" class="ch.qos.logback.core.FileAppender">
<file>logs/ApplicationLogs.log</file>
<append>true</append>
<encoder>
<pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
</encoder>
</appender>
<appender name="FILE-DEBUG" class="ch.qos.logback.core.FileAppender">
<file>logs/ApplicationLogs.log</file>
<append>true</append>
<encoder>
<pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
</encoder>
</appender>
<appender name="FILE-INFO" class="ch.qos.logback.core.FileAppender">
<file>logs/ApplicationLogs.log</file>
<append>true</append>
<encoder>
<pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="FILE-ERROR" />
</root>
<root level="DEBUG">
<appender-ref ref="FILE-DEBUG" />
</root>
<root level="ERROR">
<appender-ref ref="FILE-INFO" />
</root>
</configuration>
But I didn't get the correct loges information .Do logback.xml in wrong format?
If I understood correctly, you want to log the Levels ERROR, INFO and DEBUG to one file.
Please change your config as so:
<appender name="FILE" class="ch.qos.logback.core.FileAppender">
<file>logs/ApplicationLogs.log</file>
<encoder>
<pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
</encoder>
</appender>
<root level="DEBUG">
<appender-ref ref="FILE" />
</root>
Logback will then log all events of levels DEBUG and higher. That means it will log DEBUG, INFO, WARN, ERROR.
You can leave out <append>true</append> it is the default.
Recently added some println output to my program...
and now dont want logback INFO messages merging with them.
How can I get all messages to stderr ?
Create appender and attach all logs for it:
<appender name="STDERR" class="ch.qos.logback.core.ConsoleAppender">
<target>System.err</target>
<encoder>
<pattern>%date [%thread] - 5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<logger name="org.apache" level="INFO ">
<appender-ref ref="STDERR"/>
</logger>
All org.apache class logs(that uses slf4j) will be directed to System.err
Use a ConsoleAppender with the target attribute set to System.err. See http://logback.qos.ch/manual/appenders.html#ConsoleAppender for details.
Something like this in your logback.xml should work:
<configuration>
<appender name="STDERR" class="ch.qos.logback.core.ConsoleAppender">
<!-- encoders are assigned the type
ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
<target>System.err</target>
<encoder>
<pattern>%-4relative [%thread] %-5level %logger{35} - %msg %n</pattern>
</encoder>
</appender>
<root level="DEBUG">
<appender-ref ref="STDERR" />
</root>
</configuration>
I'm running a Java servlet inside Tomcat 7.0.52.
This is my logback.xml file
<configuration debug="true">
<appender name="FILE" class="ch.qos.logback.core.FileAppender">
<file>/home/my-user/my-log.log</file>
<append>true</append>
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<root level="DEBUG">
<appender-ref ref="FILE" />
</root>
</configuration>
Unfortunately I'm nowhere seeing Logback's debug output. Neither in catalina.out, nor in my-log.log or on the console. Where is it?
Just to add: Changes in logback.xml are reflected in the logging output.
In your logback configuration, you define a file appender. What you do not do is define a ConsoleAppender, which will log to stdout/stderr.
catalina.out being the redirection of stdout/stderr used by the Tomcat init script, adding this to your configuration should solve your problem.
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<target>System.out</target>
<filter class="ch.qos.logback.classic.filter.ThresholdFilter">
<level>debug</level>
</filter>
<encoder>
<pattern><![CDATA[
%-20(%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread]) %-5level %logger{80}[%L] - %msg%n
]]></pattern>
</encoder>
</appender>
<appender name="FILE" class="ch.qos.logback.core.FileAppender">
<file>/home/my-user/my-log.log</file>
<append>true</append>
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<root level="DEBUG">
<appender-ref ref="STDOUT"/>
<appender-ref ref="FILE" />
</root>