Faraday::ConnectionFailed, Connection denied - connect(2) for “localhost” port 9200 Error Ruby on Ra

Posted 2023-03-22

【中文标题】Faraday::ConnectionFailed, Connection denied - connect(2) for “localhost” port 9200 Error Ruby on Rails

【英文标题】：Faraday::ConnectionFailed, Connection refused - connect(2) for “localhost” port 9200 Error Ruby on Rails

【发布时间】：2016-01-27 07:14:16

【问题描述】：

我正在尝试使用 Ruby on Rails 在我的应用程序中添加 Searchkick gem，但是当我在搜索框中输入单词时，我的应用程序中出现此错误。我已经根据需要安装了elasticsearch和最新版本的java，但错误仍然是一样的。这是我得到的错误：

Faraday::ConnectionFailed in PostsController#search

连接被拒绝 - “localhost”端口 9200 的连接（2）

这是我的代码：

终端显示安装了弹性搜索：

终端

Warning: elasticsearch-1.7.3 already installed

posts_controller.rb

class PostsController < ApplicationController
  before_action :set_post, only: [:show, :edit, :update, :destroy]


def search
  if params[:search].present?
    @posts = Post.search(params[:search])
  else
    @posts = Post.all
  end
end
  # GET /posts
  # GET /posts.json
  def index
    @posts = Post.all
  end

  # GET /posts/1
  # GET /posts/1.json
  def show
  end

  # GET /posts/new
  def new
    @post = Post.new
  end

  # GET /posts/1/edit
  def edit
  end

  # POST /posts
  # POST /posts.json
  def create
    @post = Post.new(post_params)

    respond_to do |format|
      if @post.save
        format.html  redirect_to @post, notice: 'Post was successfully created.' 
        format.json  render :show, status: :created, location: @post 
      else
        format.html  render :new 
        format.json  render json: @post.errors, status: :unprocessable_entity 
      end
    end
  end

  # PATCH/PUT /posts/1
  # PATCH/PUT /posts/1.json
  def update
    respond_to do |format|
      if @post.update(post_params)
        format.html  redirect_to @post, notice: 'Post was successfully updated.' 
        format.json  render :show, status: :ok, location: @post 
      else
        format.html  render :edit 
        format.json  render json: @post.errors, status: :unprocessable_entity 
      end
    end
  end

  # DELETE /posts/1
  # DELETE /posts/1.json
  def destroy
    @post.destroy
    respond_to do |format|
      format.html  redirect_to posts_url, notice: 'Post was successfully destroyed.' 
      format.json  head :no_content 
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_post
      @post = Post.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def post_params
      params.require(:post).permit(:name)
    end
end

model/post.rb

class Post < ActiveRecord::Base
  searchkick
end

views/post/index.html.erb

<p id="notice"><%= notice %></p>

<%= form_tag search_posts_path, method: :get, class: "navbar-form navbar-right", role: "search" do %>
        <p>
          <%= text_field_tag :search, params[:search], class: "form-control" %>
          <%= submit_tag "Search", name: nil, class: "btn btn-default" %>
        </p>
      <% end %>

<h1>Listing Posts</h1>

<table>
  <thead>
    <tr>
      <th>Name</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @posts.each do |post| %>
      <tr>
        <td><%= post.name %></td>
        <td><%= link_to 'Show', post %></td>
        <td><%= link_to 'Edit', edit_post_path(post) %></td>
        <td><%= link_to 'Destroy', post, method: :delete, data:  confirm: 'Are you sure?'  %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>

<%= link_to 'New Post', new_post_path %>

views/search.html.erb

<table>
  <thead>
    <tr>
      <th>Search Result</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @posts.each do |post| %>
      <tr>
        <td><%= post.name %></td>
        <td><%= link_to 'Show', post %></td>
        <td><%= link_to 'Edit', edit_post_path(post) %></td>
        <td><%= link_to 'Destroy', post, method: :delete, data:  confirm: 'Are you sure?'  %></td>
      </tr>
    <% end %>
  </tbody>
</table>

config/routes.rb

Rails.application.routes.draw do
  resources :posts do
  collection do
    get 'search'
  end
end
end

这是显示错误的屏幕：

【参考方案1】：

Connection refused - connect(2) for "localhost" port 9200

您的弹性搜索服务似乎没有运行。您必须确保它正在运行。

要查看您的弹性搜索服务是否正在运行，请运行：

curl localhost:9200

如果它正在运行，那么它应该返回一个像这样的哈希：

  "status" : 200,
  "name" : "Buzz",
  "cluster_name" : "your_cluster_name",
  "version" : 
    "number" : "1.4.5",
    "build_hash" : "...",
    "build_timestamp" : "2015-04-27T08:06:06Z",
    "build_snapshot" : false,
    "lucene_version" : "4.10.4"
  ,
  "tagline" : "You Know, for Search"

如果弹性搜索没有运行，这很可能是您的情况，请使用以下命令启动它：

sudo service elasticsearch start

这应该可以解决您的问题。

【讨论】：

sudo service elasticsearch start 给我消息“sudo: service: command not found”

@Dan 如果您使用的是 Mac，那么您应该尝试使用 brew services start elasticsearch