未能打開TCP連接到本地主機：9200（連接被拒絕 - 連接（2）爲「本地主機」端口9200）（Faraday :: ConnectionFailed）

Question

我收到錯誤：Puma發現此錯誤：無法打開TCP連接到localhost：9200（Connection refused - connect（2）for「localhost」port 9200）（Faraday :: ConnectionFailed）在ubuntu 14.04的rails應用程序中。

下面

是我的彈性搜索的終端輸出：

prashanth@prashanth-OptiPlex-390:~$ sudo service elasticsearch restart 
* Starting Elasticsearch Server                            prashanth@prashanth-OptiPlex-390:~$ sudo service elasticsearch start 
* Starting Elasticsearch Server                            * Already running.                              [ OK ] 
prashanth@prashanth-OptiPlex-390:~$ curl -X GET 'http://localhost:9200' 
curl: (7) Failed to connect to localhost port 9200: Connection refused 
prashanth@prashanth-OptiPlex-390:~$ 

這裏是/etc/elasticsearch/elasticsearch.yml文件

network.host: 127.0.0.1 
transport.tcp.port: 9200 
http.port: 9200 

錯誤說明我彈的搜索設置：

Puma caught this error: Failed to open TCP connection to localhost:9200 (Connection refused - connect(2) for "localhost" port 9200) (Faraday::ConnectionFailed) 
/home/prashanth/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/net/http.rb:882:in `rescue in block in connect' 
/home/prashanth/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/net/http.rb:879:in `block in connect' 
/home/prashanth/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/timeout.rb:91:in `block in timeout' 
/home/prashanth/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/timeout.rb:101:in `timeout' 
/home/prashanth/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/net/http.rb:878:in `connect' 
/home/prashanth/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/net/http.rb:863:in `do_start' 
/home/prashanth/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/net/http.rb:852:in `start' 
/home/prashanth/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/net/http.rb:1398:in `request' 
/home/prashanth/.rvm/gems/ruby-2.3.1/gems/faraday-0.10.1/lib/faraday/adapter/net_http.rb:83:in `perform_request' 
/home/prashanth/.rvm/gems/ruby-2.3.1/gems/faraday-0.10.1/lib/faraday/adapter/net_http.rb:41:in `block in call' 
/home/prashanth/.rvm/gems/ruby-2.3.1/gems/faraday-0.10.1/lib/faraday/adapter/net_http.rb:88:in `with_net_http_connection' 
/home/prashanth/.rvm/gems/ruby-2.3.1/gems/faraday-0.10.1/lib/faraday/adapter/net_http.rb:33:in `call' 
/home/prashanth/.rvm/gems/ruby-2.3.1/gems/faraday-0.10.1/lib/faraday/rack_builder.rb:139:in `build_response' 
/home/prashanth/.rvm/gems/ruby-2.3.1/gems/faraday-0.10.1/lib/faraday/connection.rb:377:in `run_request' 
/home/prashanth/.rvm/gems/ruby-2.3.1/gems/elasticsearch-transport-5.0.0/lib/elasticsearch/transport/transport/http/faraday.rb:23:in `block in perform_request' 
/home/prashanth/.rvm/gems/ruby-2.3.1/gems/elasticsearch-transport-5.0.0/lib/elasticsearch/transport/transport/base.rb:257:in `perform_request' 
/home/prashanth/.rvm/gems/ruby-2.3.1/gems/elasticsearch-transport-5.0.0/lib/elasticsearch/transport/transport/http/faraday.rb:20:in `perform_request' 
/home/prashanth/.rvm/gems/ruby-2.3.1/gems/elasticsearch-transport-5.0.0/lib/elasticsearch/transport/client.rb:128:in `perform_request' 

Answer 1

在您發佈的設置，您的HTTP和TCP端口具有相同的端口號分配編號

network.host: 127.0.0.1 
transport.tcp.port: 9200 
http.port: 9200 

我會建議更改transport.tcp.port並再次嘗試。

嘗試使用默認值，除非你已經有9300端口在使用中：

network.host: 127.0.0.1 
transport.tcp.port: 9300 
http.port: 9200 

如果您仍然有問題，你可能需要打開的端口上的防火牆程序。在Ubuntu上，這可能是UFW。

如果您的服務腳本具有狀態功能，這可能會告訴您Elasticsearch實例是否已正確啓動。如果失敗，可以使用ps aux來確定它是否正在運行。

$ sudo service elasticsearch status 

或者

$ ps aux | grep elasticsearch 

正如類似的問題指出，捲曲可以在Elasticsearch沒有運行（：Faraday::ConnectionFailed, Connection refused - connect(2) for 「localhost」 port 9200 Error Ruby on Rails源）給予拒絕連接錯誤。