Hi, I have been trying to pass multiple values in the MDC. I want to use the values to create unique paths and log file names. I'm unable to use more than one value that is passed to the MDC. How would I go about doing this? I have also tried using SiftingAppender but I was not able figure out how to use more than one discriminator. Is there a way to store the value from the pattern %X{VAR}? Thanks MDC.put("jobName", jobName); MDC.put("station", station); //logback.groovy file import ch.qos.logback.classic.encoder.PatternLayoutEncoder import ch.qos.logback.classic.PatternLayout import ch.qos.logback.classic.sift.GSiftingAppender import ch.qos.logback.classic.sift.MDCBasedDiscriminator import ch.qos.logback.core.ConsoleAppender import ch.qos.logback.core.FileAppender import ch.qos.logback.core.rolling.FixedWindowRollingPolicy import ch.qos.logback.core.rolling.RollingFileAppender import ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy import ch.qos.logback.core.spi.LifeCycle import static ch.qos.logback.classic.Level.DEBUG import static ch.qos.logback.classic.Level.INFO import static ch.qos.logback.classic.Level.OFF appender("FILE", FileAppender) { file = "logs/${station}/${jobName}.log append = true encoder( PatternLayoutEncoder ) { pattern = "[%date] %-5level: %msg [%file:%line] %n" } } //Only 1 VAR will contain a value. appender("SIFT", GSiftingAppender) { discriminator(MDCBasedDiscriminator) { key = "jobName" defaultValue = "unknown" } discriminator(MDCBasedDiscriminator) { key = "station" defaultValue = "unknown" } sift { appender("FILE-${jobName}", FileAppender) { file = "logs/${station}/${jobName}.log" append = false layout(PatternLayout) { pattern = "%d [%thread] %level %mdc %logger{35} - %msg%n" } } } } -- View this message in context: http://old.nabble.com/Multiple-MDC-variable-substitution-tp30560208p30560208... Sent from the Logback User mailing list archive at Nabble.com.