elasticsearch不能使用root啟動問題解決

問題：

　　es安裝好之后，使用root啟動會報錯：can not run elasticsearch as root

[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 root
    at 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 root
    at 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

原因：

　　為了安全不允許使用root用戶啟動

解決：

　　es5之后的都不能使用添加啟動參數或者修改配置文件等方法啟動了，必須要創建用戶

 

　　1、創建用戶：elasticsearch

[root@iZbp1bb2egi7w0ueys548pZ bin]# adduser elasticsearch

　　2、創建用戶密碼，需要輸入兩次

[root@iZbp1bb2egi7w0ueys548pZ bin]# passwd elasticsearch

　　3、將對應的文件夾權限賦給該用戶

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

　　4、切換至elasticsearch用戶

[root@iZbp1bb2egi7w0ueys548pZ etc]# su elasticsearch

　　5、進入啟動目錄啟動 /usr/local/elasticsearch-6.0.0/bin  使用后台啟動方式：./elasticsearch -d

[elasticsearch@vmt10003 bin]$ ./elasticsearch -d

　　6、啟動后測試

　　輸入curl ip:9200,如果返回一個json數據說明啟動成功

 

 

可能遇到的問題

　　1、啟動后訪問ip:9200沒有顯示json

　　

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

 

　　解決：

　　修改elasticsearch.yml文件，添加

　　network.host: 0.0.0.0

　　再次啟動就可以了

[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"
}