[root@iZbp1bb2egi7w0ueys548pZ bin]# ./elasticsearch
[2019-01-21T09:50:59,387][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as rootat org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:134) ~[elasticsearch-6.0.0.jar:6.0.0]at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:121) ~[elasticsearch-6.0.0.jar:6.0.0]at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:69) ~[elasticsearch-6.0.0.jar:6.0.0]at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:134) ~[elasticsearch-6.0.0.jar:6.0.0]at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-6.0.0.jar:6.0.0]at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-6.0.0.jar:6.0.0]at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) ~[elasticsearch-6.0.0.jar:6.0.0]
Caused by: java.lang.RuntimeException: can not run elasticsearch as rootat org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:104) ~[elasticsearch-6.0.0.jar:6.0.0]at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:171) ~[elasticsearch-6.0.0.jar:6.0.0]at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:322) ~[elasticsearch-6.0.0.jar:6.0.0]at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:130) ~[elasticsearch-6.0.0.jar:6.0.0]... 6 more

[root@iZbp1bb2egi7w0ueys548pZ bin]# adduser elasticsearch

[root@iZbp1bb2egi7w0ueys548pZ bin]# passwd elasticsearch

[root@iZbp1bb2egi7w0ueys548pZ local]# chown -R elasticsearch-6.0.0 elasticsearch

[root@iZbp1bb2egi7w0ueys548pZ etc]# su elasticsearch

bash-4.2$ ./elasticsearch

[root@iZbp1bb2egi7w0ueys548qZ ~]# curl 10.132.131.51:9200
curl: (7) Failed connect to 10.132.131.51:9200; Connection refused

[root@iZbp1bb2egi7w0ueys548qZ ~]# curl 10.132.131.51:9200
{"name" : "dMD7fZd","cluster_name" : "elasticsearch","cluster_uuid" : "Cy4a99t2Sw2_hnJ_jtdRgA","version" : {"number" : "6.0.0","build_hash" : "8f0685b","build_date" : "2017-11-10T18:41:22.859Z","build_snapshot" : false,"lucene_version" : "7.0.1","minimum_wire_compatibility_version" : "5.6.0","minimum_index_compatibility_version" : "5.0.0"},"tagline" : "You Know, for Search"
}