Java服务-常用技术-logback中totalSizeCap和maxHistory无效的解决办法

最近接入的安全日志项目较多，由于数据量贼大，导致日志输出过多，然后服务器不断报警，经过排查发现logbook中配置的totalSizeCap和maxHistory均没有生效，本来配置的7天，结果发现服务器上日志文件存了60多天，导致服务器磁盘扛不住。特此记录寻找到的解决办法，如下，供同行一起学习交流；

totalSizeCap 无效 升级logbackjar包到1.1.8版本，最好升级到1.2.0版本，因为1.2.0解决了当文件总大小大于2G时不能自动删除旧文件的问题，因为源码中有个文件大小判断是错误的。

maxHistory 无效，需要增加一个设置 <cleanHistoryOnStart>true</cleanHistoryOnStart>，在只有设置为true并且 maxHistory 不为零才能起效。

所以修改后的配置应该是

<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">



<rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">

<!-- rollover daily -->

<fileNamePattern>${LOG_HOME}/consumer.%d{yyyy-MM-dd}.%i.log</fileNamePattern>

<!-- each file should be at most 100MB, keep 60 days worth of history, but at most 20GB -->
<maxFileSize>50MB</maxFileSize>
<maxHistory>30</maxHistory>
<totalSizeCap>2GB</totalSizeCap>
<cleanHistoryOnStart>true</cleanHistoryOnStart>
</rollingPolicy>

<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">

<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} -%msg%n</pattern>

</encoder>

</appender>

　

最后的

<root level="INFO">

<appender-ref ref="FILE" />

</root>

不能少了 ，根据实际配置来，appender name = 后面的参数是啥，就在<appender-ref ref="" /> 写啥

例子：

修改前：

<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

    <fileNamePattern>${log.home}/ui/${loggingUserId}/mylog_user_%d{yyyy-MM-dd}.log</fileNamePattern>

    <MaxHistory>7</MaxHistory>

</rollingPolicy>

　　

修改后（增加【<cleanHistoryOnStart>true</cleanHistoryOnStart>】这一行）：

<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

    <fileNamePattern>${log.home}/ui/${loggingUserId}/mylog_user_%d{yyyy-MM-dd}.log</fileNamePattern>

    <MaxHistory>7</MaxHistory>

    <cleanHistoryOnStart>true</cleanHistoryOnStart>

</rollingPolicy>

以下是两种常见的配置方法

将SizeAndTimeBasedRollingPolicy 改为TimeBasedRollingPolicy

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <appender name="File" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>/home/appadmin/logs/test.%i.log.zip</fileNamePattern>
            <maxHistory>365</maxHistory>
            <totalSizeCap>10GB</totalSizeCap>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>100 MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
    </appender>
</configuration>

将maxFileSize放到timeBasedFileNamingAndTriggeringPolicy 外面

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <appender name="File" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy ">
            <fileNamePattern>/home/appadmin/logs/test.%i.log.zip</fileNamePattern>
            <maxHistory>365</maxHistory>
            <totalSizeCap>10GB</totalSizeCap>
            <maxFileSize>100 MB</maxFileSize>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
    </appender>
</configuration>