Java Util Logging JSON encoder for Logstash

Include as a dependency

First, add it to your project as a dependency.

Maven style:

<dependency>
  <groupId>net.logstash.logging</groupId>
  <artifactId>logstash-util-formatter</artifactId>
  <version>1.0</version>
</dependency>

Use it in your logging.properties like this:

handlers=java.util.logging.ConsoleHandler
java.util.logging.ConsoleHandler.formatter=net.logstash.logging.formatter.LogstashUtilFormatter

Use it in your logstash configuration like this:

input {
  file {
    type => "your-log-type"
    path => "/some/path/to/your/file.log"
    format => "json_event"
  }
}

Example usage in Jenkins on Debian

• Create a directory in JENKINS_HOME: mkdir /var/lib/jenkins/lib
• Copy the shaded jar to this directory.
• Create a logging.properties in /var/lib/jenkins/lib:

handlers= java.util.logging.ConsoleHandler,java.util.logging.FileHandler
.level= INFO

java.util.logging.FileHandler.level = INFO
java.util.logging.FileHandler.formatter = net.logstash.logging.formatter.LogstashUtilFormatter
java.util.logging.FileHandler.pattern = /var/log/jenkins/logstash.log
java.util.logging.FileHandler.limit = 5000000
java.util.logging.FileHandler.count = 1

java.util.logging.ConsoleHandler.level = INFO
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter

• Extend JAVA_ARGS in /etc/default/jenkins:

JAVA_ARGS="$JAVA_ARGS -Djava.endorsed.dirs=$JENKINS_HOME/lib -Djava.util.logging.config.file=$JENKINS_HOME/lib/logging.properties"
JAVA_ARGS="$JAVA_ARGS -Dnet.logstash.logging.formatter.LogstashUtilFormatter.tags=master,mailer"

• Use it in your logstash configuration like this:

input {
  file {
    type => "jenkins-server"
    path => "/var/log/jenkins/logstash.log"
    format => "json_event"
  }
}

• By setting the system propery net.logstash.logging.formatter.LogstashUtilFormatter.tags you may easily add tags, which let you differentiate between multiple instances running on the same host.