https://tecoble.techcourse.co.kr/post/2021-08-07-logback-tutorial/

https://github-wiki-see.page/m/woowacourse-teams/2020-zeze/wiki/Log

https://tecoble.techcourse.co.kr/post/2020-07-30-use-logger/

https://ckddn9496.tistory.com/79

https://ckddn9496.tistory.com/81

검프의 logback https://livenow14.tistory.com/64

log4j2 https://junghyungil.tistory.com/160

logback-access

https://tlo-developer.tistory.com/323

공식문서

https://logback.qos.ch/manual/appenders.html

src/main/resources/logback-spring.xml

logback-spring.xml

<configuration>

    <appender name="Error" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <!-- 로그 파일이 저장될 경로 -->
        <file>./logs/errorLogFile.log</file>
        <!-- 롤링 정책 설정 -->
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- daily rollover -->
            <fileNamePattern>errorLogFile.%d{yyyy-MM-dd}.log</fileNamePattern>
            <!-- keep 3 days' worth of history capped at 1GB total size -->
            <maxHistory>3</maxHistory>
            <totalSizeCap>1GB</totalSizeCap>
        </rollingPolicy>

        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{35} - %msg %n</pattern>
        </encoder>
    </appender>

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{35} - %msg%n</pattern>
        </encoder>
    </appender>

    <appender name="DB" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <!-- 로그 파일이 저장될 경로 -->
        <file>./logs/dbLogFile.log</file>
        <!-- 롤링 정책 설정 -->
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- daily rollover -->
            <fileNamePattern>dbLogFile.%d{yyyy-MM-dd}.log</fileNamePattern>
            <!-- keep 3 days' worth of history capped at 1GB total size -->
            <maxHistory>3</maxHistory>
            <totalSizeCap>1GB</totalSizeCap>
        </rollingPolicy>

        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{35} - %msg %n</pattern>
        </encoder>
    </appender>

    <root level="WARN">
        <appender-ref ref="STDOUT"/>
        <appender-ref ref="Error"/>
    </root>

    <logger name="org.hibernate.SQL" level="DEBUG" additivity="false">
        <appender-ref ref="DB"/>
    </logger>

</configuration>

WARN level 로그를 RollingAppender 방식으로 ./logs 폴더에 errorLogFile.log 파일에 저장