Railsでredisに接続できない

前提・実現したいこと

https://yu-kyoto2720.hatenablog.com/entry/2018/10/31/165815
このサイトを参考にしてpvランキングサイトを作っています

下にスクリーンショットで貼っているエラーを解消したいです

https://qiita.com/hgsgtk/items/7e4990ad76ddaa6875e6
このサイトを参考にredisを立ち上げようとしていますが、sudo /etc/initを実行するとコマンドが見つかりませんと言われます
sudo /etc/init.d/redis start、redis-cliを実行すると下のようになります

[vagrant@localhost kadai7]$ sudo /etc/init.d/redis start
[vagrant@localhost kadai7]$ redis-cli
127.0.0.1:6379>

OSはmacで、vagrantのローカル環境です

http://0.0.0.0:3000/comments/11に接続した時のエラーです（解消したいエラー）

発生している問題・エラーメッセージ

該当のソースコード

redis.rb


require 'redis'
uri = URI.parse('localhost:6379')
REDIS = Redis.new(host: uri.host, port: uri.port)

comments_controller.rb


class CommentsController < ApplicationController

  def index
    @comments = Comment.all

  end
  def show
    @comment = Comment.find_by(id: params[:id])
    @user = User.find_by(id: @comment.user_id)
    @comment.redis_access
  end
  before_action :authenticate_user, {only: [:new, :create, :edit, :update, :destroy]}

  def new
  end

  def create
    
    Comment.create(title: comment_params[:title], content: comment_params[:content],user_id: current_user.id)  
    
    redirect_to("/comments/index")
  end

  def edit
    if Comment.find_by(id: params[:id]).user_id == current_user.id 

      @comment = Comment.find_by(id: params[:id])
    else
      flash[:notice] = "Not Yours"
      redirect_to("/comments/index")
    end
  end

  def update
    @comment = Comment.find_by(id: params[:id])
    @comment.title = comment_params[:title]
    @comment.content = comment_params[:content]
    @comment.save
    redirect_to("/comments/index")
  end

  def destroy
    if Comment.find_by(id: params[:id]).user_id == current_user.id 
      @comment = Comment.find_by(id: params[:id])
      @comment.destroy
      redirect_to("/comments/index")
    else
      flash[:notice] = "Not Yours"
      redirect_to("/comments/index")
    end
  end

  private
  def comment_params
    params.permit(:title,:content)
  end
end

comments.rb


class Comment < ApplicationRecord
    validates :user_id, {presence: true}
    def redis_access
        　　REDIS.zincrby "comments", 1, self.id
    end

    def redis_page_view
        　　REDIS.zscore("comments", self.id).floor
    end

    def Comment.most_popular(limit: 4)
        　　most_popular_ids = REDIS.zrevrangebyscore "comments", "+inf", 0, limit: [0, limit]
        　　where(id: most_popular_ids).sort_by{ |comment| most_popular_ids.index(comment.id.to_s) }
    end
end

show.html.erb

<div id="title">
    <div>
        <p><%= @comment.created_at %></p>
        <%= @user.email %>

        <h1><%= @comment.title %></h1>
    </div>
</div>
<div id="article_wrap">

    <div id="content"><%= @comment.content %>
</div>
<div class="clear"></div>
</div>

routes.rb

Rails.application.routes.draw do
  
  devise_for :users
  root 'comments#index'
  get "comments/test" => "comments#test"

  get 'comments/index'
  get "comments/new" => "comments#new"
  get "comments/:id" => "comments#show"
  post 'comments/create' => 'comments#create'
  get "comments/:id/edit" => "comments#edit"
  post "comments/:id/update" => "comments#update"
  post "comments/:id/destroy" => "comments#destroy"

  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end