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在Linux上部署ElasticSearch时抛出了一个异常如下：
log4j:ERROR setFile(null,true) call failed.
java.io.FileNotFoundException: /usr/local/elasticsearch/logs/elasticsearch.log
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
at java.io.FileOutputStream.<init>(FileOutputStream.java:142)
at org.apache.log4j.FileAppender.setFile(FileAppender.java:294)
at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:165)
at org.apache.log4j.DailyRollingFileAppender.activateOptions(DailyRollingFileAppender.java:223)
at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:307)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:172)
at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:104)
at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:842)
at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:768)
at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:648)
at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:514)
at org.apache.log4j.PropertyConfigurator.configure(PropertyConfigurator.java:440)
at org.elasticsearch.common.logging.log4j.LogConfigurator.configure(LogConfigurator.java:128)
at org.elasticsearch.bootstrap.Bootstrap.setupLogging(Bootstrap.java:204)
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:258)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35)
以为自己权限不够，使用sudo运行，仍旧抛出如下错误：
Exception in thread "main" java.lang.RuntimeException: don‘t run elasticsearch as root.
at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:93)
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:144)
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:285)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35)
Refer to the log for complete error details.
将ElasticSearch的安装目录及其子目录改为另外一个非root账户，如：
sudo chown -R guest elasticsearch-2.4.0 sudo chgrp -R guest elasticsearch-2.4.0
由于ElasticSearch可以接收用户的脚本并执行，处于安全性考虑，建议创建一个单独的用户来运行ElasticSearch。
Elasticsearch部署异常Permission denied
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原文地址：http://www.cnblogs.com/krockey/p/5850141.html
