1、JRE的支援，必須1.8以上，1.7不行。

2、 不能以root使用者啟動。否則會報如下錯誤

[2017-09-07T19:43:10,628][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:127) ~[elasticsearch-5.5.2.jar:5.5.2]

    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:114) ~[elasticsearch-5.5.2.jar:5.5.2]

    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:67) ~[elasticsearch-5.5
 
.2.jar:5.5.2]

    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:122) ~[elasticsearch-5.5.2.jar:5.5.2]

    at org.elasticsearch.cli.Command.main(Command.java:88) ~[elasticsearch-5.5.2.jar:5.5.2]

    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:91) ~[elasticsearch-5.5
 
.2.jar:5.5.2]

    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:84) ~[elasticsearch-5.5.2.jar:5.5.2]

Caused by: java.lang.RuntimeException: can not run elasticsearch as root

    at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:106) ~[elasticsearch-5.5.2.jar:5.5.2]

    at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:194) ~[elasticsearch-5.5.2.jar:5.5.2]

    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:351) ~[elasticsearch-5.5.2.jar:5.5.2]

    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:123) ~[elasticsearch-5.5.2.jar:5.5.2]

    ... 6 more

3、新建使用者後臺執行，加上-d引數即可

useradd elastic
chown -R elastic:elastic /home/es/elasticsearch-5.5.2/
 sh /home/es/elasticsearch-5.5.2/bin/elasticsearch -d

使用ps -ef | grep elasticsearch檢視es是否啟動成功!

4、允許外網連線配置

修改/home/es/elasticsearch/config/elasticsearch.yml 檔案
把 network.host 和 http.port 前面的 備註去掉 然後Host改成你的區域網IP即可

5、防火牆的關閉

關閉firewall：
systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall開機啟動
firewall-cmd –state #檢視預設防火牆狀態（關閉後顯示notrunning，開啟後顯示running）

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