"server-log" RollingFile Appender

This appender manages server logs with automatic file rotation.

Configuration example:

<RollingFile name="server-log" fileName="logs/server.log" filePattern="logs/server-%d{yyyy-MM-dd}.log">
    <ThresholdFilter level="INFO"/>
    <PatternLayout pattern="%d %-5p [%t][%c][%X{MDC_USER}][%X{MDC_REMOTE_IP}] - %m%n"/>
    <Policies>
        <SizeBasedTriggeringPolicy size="256MB"/>
    </Policies>
    <DefaultRolloverStrategy max="10"/>
</RollingFile>

Example Log :

2025-02-06 15:17:26,487 INFO  [qtp398547146-82][com.okiok.sfiler.servlets.v2.SFilerDownloadQServlet][Business Partners\my-user][0:0:0:0:0:0:0:1] - Download completed: 06b29f6f-1c3e-4cc4-b891-061f065f5733

Log details:

1. 2025-02-06 15:17:26,487 : Date and time of the log
2. INFO : Log level
3. [qtp398547146-82] : Thread name
4. [com.okiok.sfiler.servlets.v2.SFilerDownloadQServlet] : Class name generating the log
5. [Business Partners\my-user] : Username (from MDC)
6. [0:0:0:0:0:0:0:1] : Remote IP address (from MDC)
7. - Download completed: 06b29f6f-1c3e-4cc4-b891-061f065f5733 : Log message

Basic Configuration

• Name: server-log
• Output file: logs/server.log
• Archive file pattern: logs/server-[DATE].log

Log Format

The pattern %d %-5p [%t][%c][%X{MDC_USER}][%X{MDC_REMOTE_IP}] - %m%n defines the following format:

• %d : Log date and time
• %-5p : Log level (DEBUG, INFO, ERROR...) aligned to 5 characters
• [%t] : Thread name
• [%c] : Class name generating the log
• [%X{MDC_USER}] : Username (from MDC)
• [%X{MDC_REMOTE_IP}] : Remote IP address (from MDC)
• %m : Log message
• %n : Line break

Rotation Policy

• SizeBasedTriggeringPolicy: 256MB per file
• DefaultRolloverStrategy: Maximum 10 archive files
• Rotation creates a new file when:
  • Current file reaches 256MB
  • A new day begins (based on date pattern)

References

• Log4j2 RollingFile Appender