logback.xml 설정

<configuration>
    <conversionRule conversionWord="clr" converterClass="org.springframework.boot.logging.logback.ColorConverter" />

    <property name="LOG_PATTERN" value="%clr(%d{yyyyMMdd HH:mm:ss.SSS}){magenta} %clr([%thread]){blue} %clr(%-5level){} %clr([%logger{0}:%line]){cyan} : %msg %n" />

    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>${LOG_PATTERN}</pattern>
        </encoder>
    </appender>

    <appender name="file" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>./application_log/application.log</file>

        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>error</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>

        <encoder>
            <pattern>%d{yyyyMMdd HH:mm:ss.SSS} [%thread] %-5level [%logger{0}:%line] : %msg %n</pattern>
        </encoder>

        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>application.log.%d{yyyy-MM-dd}.log</fileNamePattern>
            <maxHistory>30</maxHistory>
            <totalSizeCap>5GB</totalSizeCap>
        </rollingPolicy>
    </appender>

    <root level="info">
        <appender-ref ref="CONSOLE" />
        <appender-ref ref="file" />
    </root>
</configuration>

https://frozenpond.tistory.com/87?category=1175501
https://frozenpond.tistory.com/88
https://frozenpond.tistory.com/89?category=1175501

위 링크가 너무 잘 설명해줌

로그 파일을 저장할때 색상값을 넣으면 not recognize (깨짐현상) 이 발생한다.