Hello  I'm running apache zookeeper 3.8.4. File zookeeper.log does not get created. Log files are empty except the following message: SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. SLF4J: Failed to load class "org.slf4j.impl.StaticMDCBinder". SLF4J: Defaulting to no-operation MDCAdapter implementation. SLF4J: See http://www.slf4j.org/codes.html#no_static_mdc_binder for further details. How can I configure zookeeper with logs working ? According to the links, this is due to slf4j not detecting logback. The process runs with the following options in the commandline (extract) The classpath does seem to include slf4j and logback jars,  as well as the conf directory containing logback.xml /apps/dis/java/jdk/bin/java -Dzookeeper.log.dir=/apps/zookeeper/log -Dzookeeper.log.file=zookeeper.log -cp ... /apps/zookeeper/bin/zkcurrent/bin/../lib/slf4j-api-1.7.30.jar: ... /apps/zookeeper/bin/zkcurrent/bin/../lib/logback-core-1.2.13.jar: ... /apps/zookeeper/bin/zkcurrent/bin/../lib/logback-classic-1.2.13.jar: /apps/zookeeper/bin/zkcurrent/bin/../conf: ... org.apache.zookeeper.server.quorum.QuorumPeerMain /apps/zookeeper/bin/zkcurrent/bin/../conf/zoo.cfg The logback.xml file is in  /apps/zookeeper/bin/zkcurrent/bin/../conf with rollingfile and console appenders activated: <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <pattern>%d{ISO8601} [myid:%X{myid}] - %-5p [%t:%C{1}@%L] - %m%n</pattern> </encoder> <filter class="ch.qos.logback.classic.filter.ThresholdFilter"> <level>${zookeeper.console.threshold}</level> </filter> </appender> ... <appender name="ROLLINGFILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <File>${zookeeper.log.dir}/${zookeeper.log.file}</File> <encoder> <pattern>%d{ISO8601} [myid:%X{myid}] - %-5p [%t:%C{1}@%L] - %m%n</pattern> </encoder> <filter class="ch.qos.logback.classic.filter.ThresholdFilter"> <level>${zookeeper.log.threshold}</level> </filter> <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy"> <maxIndex>${zookeeper.log.maxbackupindex}</maxIndex> <FileNamePattern>${zookeeper.log.dir}/${zookeeper.log.file}.%i</FileNamePattern> </rollingPolicy> <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy"> <MaxFileSize>${zookeeper.log.maxfilesize}</MaxFileSize> </triggeringPolicy> </appender> ... <root level="INFO"> <appender-ref ref="CONSOLE" /> <appender-ref ref="ROLLINGFILE" /> </root> All suggestions welcome. Regards ... View more