diff --git a/.gitignore b/.gitignore
index ff0bb19..03296aa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,5 @@
 /coverage
 
 /.DS_Store
+
+/Gemfile.plugins
diff --git a/Gemfile b/Gemfile
index eef1be7..6105d88 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,3 +13,5 @@ group :development, :test do
   gem "capybara", "~> 2.2.1"
   gem "simplecov", "~> 0.7.1", require: false
 end
+
+eval File.read "Gemfile.plugins" if File.exist?("Gemfile.plugins")
diff --git a/Gemfile.lock b/Gemfile.lock
index c8bb041..06aa5fe 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -46,6 +46,7 @@ GEM
       tzinfo (~> 1.1)
     arel (5.0.1.20140414130214)
     bcrypt (3.1.7)
+    bson (1.10.0)
     builder (3.2.2)
     capybara (2.2.1)
       mime-types (>= 1.16)
@@ -73,6 +74,9 @@ GEM
     factory_girl_rails (4.4.1)
       factory_girl (~> 4.4.0)
       railties (>= 3.0.0)
+    fluent-plugin-mongo (0.7.3)
+      fluentd (~> 0.10.9)
+      mongo (>= 1.8.0)
     fluentd (0.10.46)
       cool.io (>= 1.1.1, < 2.0.0, != 1.2.0)
       http_parser.rb (>= 0.5.1, < 0.7.0)
@@ -118,6 +122,8 @@ GEM
     mime-types (1.25.1)
     mini_portile (0.5.3)
     minitest (5.3.3)
+    mongo (1.10.0)
+      bson (~> 1.10.0)
     msgpack (0.5.8)
     multi_json (1.10.0)
     net-http-digest_auth (1.4)
@@ -209,6 +215,7 @@ DEPENDENCIES
   capybara (~> 2.2.1)
   database_cleaner (~> 1.2.0)
   factory_girl_rails
+  fluent-plugin-mongo (= 0.7.3)
   fluentd-ui!
   pry
   rake
diff --git a/Gemfile.production b/Gemfile.production
index fa75df1..30f7ea5 100644
--- a/Gemfile.production
+++ b/Gemfile.production
@@ -1,3 +1,5 @@
 source 'https://rubygems.org'
 
 gemspec
+
+eval File.read "Gemfile.plugins" if File.exist?("Gemfile.plugins")
diff --git a/app/controllers/plugins_controller.rb b/app/controllers/plugins_controller.rb
new file mode 100644
index 0000000..53f9b0d
--- /dev/null
+++ b/app/controllers/plugins_controller.rb
@@ -0,0 +1,32 @@
+class PluginsController < ApplicationController
+  before_action :find_plugin, except: [:index]
+
+  def index
+    @plugins = plugins
+  end
+
+  def install
+    @plugin.install!
+    redirect_to plugins_path
+  end
+
+  def uninstall
+    @plugin.uninstall!
+    redirect_to plugins_path
+  end
+
+  private
+
+  def plugins
+    # TODO
+    [
+      Plugin.new(gem_name: "fluent-plugin-mongo", version: "0.7.3")
+    ]
+  end
+
+  def find_plugin
+    @plugin ||= plugins.find do |plugin|
+      plugin.to_param == params[:plugin_id]
+    end
+  end
+end
diff --git a/app/helpers/plugins_helper.rb b/app/helpers/plugins_helper.rb
new file mode 100644
index 0000000..75f3122
--- /dev/null
+++ b/app/helpers/plugins_helper.rb
@@ -0,0 +1,2 @@
+module PluginsHelper
+end
diff --git a/app/models/plugin.rb b/app/models/plugin.rb
new file mode 100644
index 0000000..71dc29b
--- /dev/null
+++ b/app/models/plugin.rb
@@ -0,0 +1,80 @@
+require "fileutils"
+
+class Plugin
+  class GemError < StandardError; end
+
+  GEMFILE_PLUGIN = Rails.root + "Gemfile.plugins"
+  unless File.exists?(GEMFILE_PLUGIN)
+    File.open(GEMFILE_PLUGIN, "w") do |f|
+      f.write "# USED BY fluentd-ui internally"
+    end
+  end
+
+  include ActiveModel::Model
+
+  attr_accessor :gem_name, :version
+  validates :gem_name, presence: true
+  validates :version, presence: true
+
+  def to_param
+    gem_name
+  end
+
+  def install!
+    if valid? && !installed?
+      if fluent_gem("install", gem_name, "-v", version)
+        File.open(GEMFILE_PLUGIN, "a") do |f|
+          f.puts format_gemfile
+        end
+        self.class.gemfile_updated!
+      end
+    end
+  end
+
+  def uninstall!
+    if valid? && installed?
+      # NOTE: do not uninstall gem actually for now. because it is not necessary, and slow job
+      new_gemfile = ""
+      File.open(GEMFILE_PLUGIN).each_line do |line|
+        next if line.strip == format_gemfile
+        new_gemfile << line
+      end
+      File.open(GEMFILE_PLUGIN, "w"){|f| f.write new_gemfile }
+      self.class.gemfile_updated!
+    end
+  end
+
+  def upgrade!(new_version)
+    if installed?
+      upgrade = new(gem_name: self.gem_name, version: new_version)
+      if self.valid? && upgrade.valid?
+        self.uninstall!
+        upgrade.install!
+      end
+    end
+  end
+
+  def installed?
+    File.read(GEMFILE_PLUGIN).lines.map(&:strip).grep(format_gemfile).present?
+  end
+
+  def format_gemfile
+    %Q|gem "#{gem_name}", "#{version}"|
+  end
+
+  def fluent_gem(*commands)
+    unless system(*%W(bundle exec gem) + commands) # TODO: should grab stdout/stderr
+      raise GemError, "failed command #{commands}"
+    end
+    true
+  end
+
+  def self.gemfile_changed?
+    # if true, rails server needs to restart
+    @gemfile_changed
+  end
+
+  def self.gemfile_updated!
+    @gemfile_changed = true
+  end
+end
diff --git a/app/views/plugins/index.html.haml b/app/views/plugins/index.html.haml
new file mode 100644
index 0000000..a4d6873
--- /dev/null
+++ b/app/views/plugins/index.html.haml
@@ -0,0 +1,7 @@
+- @plugins.each do |plugin|
+  / TODO: 
+  = plugin.gem_name
+  = plugin.version
+  = "(#{plugin.installed? ? t("terms.installed") : t("terms.not_installed")})"
+  = link_to t("terms.install"), plugin_install_path(plugin), method: :put
+  = link_to t("terms.uninstall"), plugin_uninstall_path(plugin), method: :put
diff --git a/config/locales/translation_en.yml b/config/locales/translation_en.yml
index 0663aae..2cb5523 100644
--- a/config/locales/translation_en.yml
+++ b/config/locales/translation_en.yml
@@ -2,6 +2,11 @@ en:
   terms:
     sign_in: Sign in
     sign_out: Sign out
+    install: Install
+    uninstall: Uninstall
+    upgrade: Upgrade
+    installed: Installed
+    not_installed: Not Installed
 
   error:
     login_failed: Login failed.
diff --git a/config/locales/translation_ja.yml b/config/locales/translation_ja.yml
index 81cc318..47fd109 100644
--- a/config/locales/translation_ja.yml
+++ b/config/locales/translation_ja.yml
@@ -2,6 +2,11 @@ ja:
   terms:
     sign_in: ログイン
     sign_out: ログアウト
+    install: インストール
+    uninstall: アンインストール
+    upgrade: アップグレード
+    installed: インストール済み
+    not_installed: 未インストール
 
   error:
     login_failed: ログインに失敗しました。
diff --git a/config/routes.rb b/config/routes.rb
index a1e7b36..2314209 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -16,6 +16,12 @@ Rails.application.routes.draw do
   resources :users
   resource :sessions
 
+  resources :plugins do
+    put :install
+    put :uninstall
+  end
+
+
   resources :misc, only: [] do
   end
   # The priority is based upon order of creation: first created -> highest priority.
diff --git a/spec/controllers/plugins_controller_spec.rb b/spec/controllers/plugins_controller_spec.rb
new file mode 100644
index 0000000..0ec233a
--- /dev/null
+++ b/spec/controllers/plugins_controller_spec.rb
@@ -0,0 +1,5 @@
+require 'spec_helper'
+
+describe PluginsController do
+
+end
diff --git a/spec/factories/plugins.rb b/spec/factories/plugins.rb
new file mode 100644
index 0000000..a0bb630
--- /dev/null
+++ b/spec/factories/plugins.rb
@@ -0,0 +1,6 @@
+# Read about factories at https://github.com/thoughtbot/factory_girl
+
+FactoryGirl.define do
+  factory :plugin do
+  end
+end
diff --git a/spec/helpers/plugins_helper_spec.rb b/spec/helpers/plugins_helper_spec.rb
new file mode 100644
index 0000000..82c1c7c
--- /dev/null
+++ b/spec/helpers/plugins_helper_spec.rb
@@ -0,0 +1,15 @@
+require 'spec_helper'
+
+# Specs in this file have access to a helper object that includes
+# the PluginsHelper. For example:
+#
+# describe PluginsHelper do
+#   describe "string concat" do
+#     it "concats two strings with spaces" do
+#       expect(helper.concat_strings("this","that")).to eq("this that")
+#     end
+#   end
+# end
+describe PluginsHelper do
+  pending "add some examples to (or delete) #{__FILE__}"
+end
diff --git a/spec/models/plugin_spec.rb b/spec/models/plugin_spec.rb
new file mode 100644
index 0000000..546d7fb
--- /dev/null
+++ b/spec/models/plugin_spec.rb
@@ -0,0 +1,5 @@
+require 'spec_helper'
+
+describe Plugin do
+  pending "add some examples to (or delete) #{__FILE__}"
+end