在启动ElasticSearch的时候出现报错信息Permission denied

当把ElasticSearch部署好之后，然后进入到elasticsearch/bin目录下运行

./elasticsearch

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)

一开始以为是目前权限不够，在前面加上sudo 之后运行，还是报错：

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.

sudo chown -R hadoop:hadoop elasticsearch-5.5.0
sudo chgrp -R hadoop:hadoop elasticsearch-5.5.0

原因说明：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。当然，可以通过配置来实现root用户启动。

修改bin目录elasticsearch.in.sh文件中追加（不过不建议）：

JAVA_OPTS="$JAVA_OPTS -Des.insecure.allow.root=true"

最后

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