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问题：

主日志保留了好几十G，虽然归档日志每天都有按日期/按大小归档到指定路径，并进行压缩，这样的情况还是得到期清理日志

解决方案：

有人建议写cron脚本，定期清除，不是我想要的，因为类似的服务有好几套/每套7-8个，我希望logback内部完全搞定。

原始配置：

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="60 seconds" debug="false"><include resource="org/springframework/boot/logging/logback/defaults.xml"/><include resource="org/springframework/boot/logging/logback/console-appender.xml"/><springProperty scope="context" name="logging.path"  source="logging.path" defaultValue="${user.dir}/logs"/><springProperty scope="context" name="spring.application.name"  source="spring.application.name"/><appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"><encoder><pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern></encoder></appender><appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"><!-- 指定日志文件的名称 --><file>${logging.path}/${spring.application.name}.log</file><rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"><fileNamePattern>${logging.path}/backup/${spring.application.name}-%d{yyyy-MM-dd}-%i.log.gz</fileNamePattern><MaxHistory>30</MaxHistory><timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"><maxFileSize>100MB</maxFileSize></timeBasedFileNamingAndTriggeringPolicy></rollingPolicy><encoder><pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern></encoder></appender><root level="INFO"><appender-ref ref="FILE"/></root><root level="DEBUG"><appender-ref ref="STDOUT"/></root>
</configuration>

优化后：

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="60 seconds" debug="false"><!-- 引入 Spring Boot 默认日志变量 --><include resource="org/springframework/boot/logging/logback/defaults.xml"/><include resource="org/springframework/boot/logging/logback/console-appender.xml"/><!-- 注入 Spring 属性 --><springProperty scope="context" name="logging.path" source="logging.path" defaultValue="${user.dir}/logs"/><springProperty scope="context" name="spring.application.name" source="spring.application.name"/><!-- 控制台输出器 --><appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"><encoder><pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern></encoder></appender><!-- 实时日志输出器（保留3天） --><appender name="REALTIME_LOG" class="ch.qos.logback.core.rolling.RollingFileAppender"><file>${logging.path}/${spring.application.name}.log</file><rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"><!-- 每天滚动一次 --><fileNamePattern>${logging.path}/${spring.application.name}-%d{yyyy-MM-dd}.log</fileNamePattern><!-- 只保留最近3天的日志 --><MaxHistory>3</MaxHistory></rollingPolicy><encoder><pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern></encoder></appender><!-- 归档日志输出器（保留7天，按大小压缩） --><appender name="ARCHIVE_LOG" class="ch.qos.logback.core.rolling.RollingFileAppender"><file>${logging.path}/archive-temp.log</file><rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"><!-- 每天滚动 + 按大小切分 --><fileNamePattern>${logging.path}/backup/${spring.application.name}-%d{yyyy-MM-dd}-%i.log.gz</fileNamePattern><!-- 保留7天 --><MaxHistory>7</MaxHistory><timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"><maxFileSize>100MB</maxFileSize></timeBasedFileNamingAndTriggeringPolicy></rollingPolicy><encoder><pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern></encoder></appender><!-- 设置根日志级别和输出位置 --><root level="INFO"><appender-ref ref="STDOUT"/><appender-ref ref="REALTIME_LOG"/><appender-ref ref="ARCHIVE_LOG"/></root></configuration>

这样主日志保留3天，方便查看，归档日志保留7-15天，达到了预期效果！