罗氏file max over_fileappender rollover_appender name(7)

通过 maxFileSize 来设置单个日志文件的大小限制。注意到这里，有一个新的标识出现 %i，这是当发生滚动时，可以为同一天的日志加上不同的后缀 index。

配置示例：

<configuration>
  <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>test.log</file>

    <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
      <fileNamePattern>foo%i.log</fileNamePattern>
      <minIndex>1</minIndex>
      <maxIndex>3</maxIndex>
    </rollingPolicy>

    <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
      <maxFileSize>5MB</maxFileSize>
    </triggeringPolicy>
    <encoder>
      <pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
    </encoder>
  </appender>
        
  <root level="DEBUG">
    <appender-ref ref="FILE" />
  </root>
</configuration>

以一个例子来认识 FixedWindowRollingPolicy

Number of rolloversActive output targetActive log filesDescription

First rollover. foo.log is renamed as foo1.log. A new foo.log file is created and becomes the active output target.

Second rollover. foo1.log is renamed as foo2.log. foo.log is renamed as foo1.log. A new foo.log file is created and becomes the active output target.

foo1.log, foo2.log, foo3.log

Third rollover. foo2.log is renamed as foo3.log. foo1.log is renamed as foo2.log. foo.log is renamed as foo1.log. A new foo.log file is created and becomes the active output target.

foo1.log, foo2.log, foo3.log

In this and subsequent rounds, the rollover begins by deleting foo3.log. Other files are renamed by incrementing their index as shown in previous steps. In this and subsequent rollovers, there will be three archive logs and one active log file.

配置示例，一般配合 FixedWindowRollingPolicy：

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