Logging

Para uses SLF4J as a logging abstraction framework, meaning you can plug in any logging implementation like Logback, Log4j2, etc. By default Para uses Logback. To use another implementation, exclude all Logback packages from pom.xml like this:

<dependency>
  <groupId>com.erudika</groupId>
  <artifactId>para-core</artifactId>
  <version>${para.version}</version>
  <exclusions>
    <exclusion>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-core</artifactId>
    </exclusion>
    <exclusion>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
    </exclusion>
    <exclusion>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-access</artifactId>
    </exclusion>
  </exclusions>
</dependency>

Logs are stored in 3 files, located in the same directory from which Para is started:

• para.log - main log file, also written to syslog
• para-metrics.log - contains all the metrics
• para-access.log - contains a history of requests

To change the directory where logs are stored, set the system property para.logs_dir to a folder of your choice (should not end with ”/”):

$ java -jar -Dpara.logs_dir=/var/logs/para para.jar