https://blog.csdn.net/qq_41725214/article/details/95904502?utm_medium=distribute.pc_relevant.none-task-blog-searchFromBaidu-1.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-searchFromBaidu-1.control
今天启动Elasticsearch的时候，报了 如下错误（非root用户启动）：
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"
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首先想到的是，es要在在非root用户状态下启动，但是我已经是在非root用户状态下了，检查/logs/es-cluster.log的日志文件，发现都是以前的日志，没有今天启动的日志，然后查看logs目录下的文件属性，如下图所示：
这个es-cluster.log文件是属于root的呀，怪不得非root用户查看没有今天的启动日志。再回去看报错信息，最后两行说明报错就是因为es-cluster.log文件的属主为root引起的。
在root用户下把es-cluster.log文件的属主改为你要启动es的用户：
chown ywq es-cluster.log
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这时即可正常启动es。
至于es-cluster.log为什么会变成root用户下的，网上说是用root用户登录启动es之后查看日志，导致elasticsearch.log的属主变成了root。
解决方案：
root用户
chown elk:elk elk目录 -R