ES啟動失敗;java.lang.IllegalStateException: No factory method found for class org.apache.logging.log4j.c

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今天啟動Elasticsearch的時候，報了 如下錯誤（非root用戶啟動）：

2019-07-14 05:40:06,326 main ERROR Unable to invoke factory method in class org.apache.logging.log4j.core.appender.RollingFileAppender for element RollingFile: java.lang.IllegalStateException: No factory method found for class org.apache.logging.log4j.core.appender.RollingFileAppender java.lang.IllegalStateException: No factory method found for class org.apache.logging.log4j.core.appender.RollingFileAppender
        at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.findFactoryMethod(PluginBuilder.java:229)
        at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:134)
        at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:958)
        at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:898)
        at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:890)
        at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:513)
        at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:237)
        at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:249)
        at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:545)
        at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:261)
        at org.elasticsearch.common.logging.LogConfigurator.configure(LogConfigurator.java:166)
        at org.elasticsearch.common.logging.LogConfigurator.configure(LogConfigurator.java:122)
        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:307)
        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:132)
        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:123)
        at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:67)
        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:134)
        at org.elasticsearch.cli.Command.main(Command.java:90)
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:91)
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:84)

2019-07-14 05:40:06,445 main ERROR Null object returned for RollingFile in Appenders.
2019-07-14 05:40:06,445 main ERROR Unable to locate appender "rolling" for logger config "root"

首先想到的是，es要在在非root用戶狀態下啟動，但是我已經是在非root用戶狀態下了，檢查/logs/es-cluster.log的日志文件，發現都是以前的日志，沒有今天啟動的日志，然后查看logs目錄下的文件屬性，如下圖所示：

這個es-cluster.log文件是屬於root的呀，怪不得非root用戶查看沒有今天的啟動日志。再回去看報錯信息，最后兩行說明報錯就是因為es-cluster.log文件的屬主為root引起的。

在root用戶下把es-cluster.log文件的屬主改為你要啟動es的用戶：

 chown ywq es-cluster.log

這時即可正常啟動es。

至於es-cluster.log為什么會變成root用戶下的，網上說是用root用戶登錄啟動es之后查看日志，導致elasticsearch.log的屬主變成了root。

解決方案：

root用戶 

chown elk:elk  elk目錄 -R