Linux系统下elasticseach安装及使用遇到的问题

1、启动时报如下错误，是因为elasticseach不能在root用户名下启动，要更换个用户名

[2018-06-15T04:42:40,140][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [node-1] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root
        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:125) ~[elasticsearch-6.2.3.jar:6.2.3]
        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) ~[elasticsearch-6.2.3.jar:6.2.3]
        at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.2.3.jar:6.2.3]
        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.2.3.jar:6.2.3]
        at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-6.2.3.jar:6.2.3]
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-6.2.3.jar:6.2.3]
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) ~[elasticsearch-6.2.3.jar:6.2.3]
Caused by: java.lang.RuntimeException: can not run elasticsearch as root
        at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:105) ~[elasticsearch-6.2.3.jar:6.2.3]
        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:172) ~[elasticsearch-6.2.3.jar:6.2.3]
        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:323) ~[elasticsearch-6.2.3.jar:6.2.3]

        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-6.2.3.jar:6.2.3]

2、用户启动elasticsearch时操作文件权限不足报错

[2018-06-15T06:07:20,499][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [node-1] uncaught exception in thread [main]

org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root
        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:125) ~[elasticsearch-6.2.3.jar:6.2.3]
        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) ~[elasticsearch-6.2.3.jar:6.2.3]
        at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.2.3.jar:6.2.3]
        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.2.3.jar:6.2.3]
        at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-6.2.3.jar:6.2.3]
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-6.2.3.jar:6.2.3]
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) ~[elasticsearch-6.2.3.jar:6.2.3]
Caused by: java.lang.RuntimeException: can not run elasticsearch as root
        at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:105) ~[elasticsearch-6.2.3.jar:6.2.3]
        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:172) ~[elasticsearch-6.2.3.jar:6.2.3]
        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:323) ~[elasticsearch-6.2.3.jar:6.2.3]

        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-6.2.3.jar:6.2.3]

解决方法：切换为root用户回到elasticsearch安装文件夹父级目录执行命令： chown 用户名(username) elasticsearch-6.2.3 -R

3、进入elasticsearch安装目录，执行 ./bin/elasticsearch 启动elasticsearch服务

4、安装好elasticsearch-head后进入elasticsearch-head-master目录执行grunt server命令启动elasticsearch-head服务

5、elasticsearch的安装参考地址：https://blog.csdn.net/qq_21383435/article/details/79367457