title: Rails - Postgres - could not connect to server: Connection refused (PG::ConnectionBad)
body: <p>Yesterday I've install Postgres and pgAdminIII, all worked correctly, but after reload it stopped working. After <code>rails server</code> I've got error message:</p>
  
  <pre><code>=&gt; Booting Thin
  =&gt; Rails 3.2.13 application starting in development on http://0.0.0.0:3000
  =&gt; Call with -d to detach
  =&gt; Ctrl-C to shutdown server
  Exiting
  /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1216:in `initialize': could not connect to server: Connection refused (PG::ConnectionBad)
          Is the server running on host "localhost" (127.0.0.1) and accepting
          TCP/IP connections on port 5432?
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1216:in `new'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1216:in `connect'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:324:in `initialize'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:28:in `new'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:28:in `postgresql_connection'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:315:in `new_connection'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:325:in `checkout_new_connection'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:247:in `block (2 levels) in checkout'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `loop'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `block in checkout'
          from /home/home/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:239:in `checkout'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:102:in `block in connection'
          from /home/home/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:101:in `connection'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:410:in `retrieve_connection'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:171:in `retrieve_connection'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:145:in `connection'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/railtie.rb:88:in `block in &lt;class:Railtie&gt;'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `instance_exec'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `run'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/railties-3.2.13/lib/rails/initializable.rb:55:in `block in run_initializers'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `each'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `run_initializers'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/railties-3.2.13/lib/rails/application.rb:136:in `initialize!'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/railties-3.2.13/lib/rails/railtie/configurable.rb:30:in `method_missing'
          from /home/home/Projects/mostdance/config/environment.rb:5:in `&lt;top (required)&gt;'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
          from /home/home/Projects/mostdance/config.ru:3:in `block in &lt;main&gt;'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/rack-1.4.5/lib/rack/builder.rb:51:in `instance_eval'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/rack-1.4.5/lib/rack/builder.rb:51:in `initialize'
          from /home/home/Projects/mostdance/config.ru:in `new'
          from /home/home/Projects/mostdance/config.ru:in `&lt;main&gt;'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/rack-1.4.5/lib/rack/builder.rb:40:in `eval'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/rack-1.4.5/lib/rack/builder.rb:40:in `parse_file'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/rack-1.4.5/lib/rack/server.rb:200:in `app'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/railties-3.2.13/lib/rails/commands/server.rb:46:in `app'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/rack-1.4.5/lib/rack/server.rb:304:in `wrapped_app'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/rack-1.4.5/lib/rack/server.rb:254:in `start'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/railties-3.2.13/lib/rails/commands/server.rb:70:in `start'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in &lt;top (required)&gt;'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
          from /home/home/.rvm/gems/ruby-1.9.3-p448/gems/railties-3.2.13/lib/rails/commands.rb:50:in `&lt;top (required)&gt;'
          from script/rails:6:in `require'
          from script/rails:6:in `&lt;main&gt;'
  </code></pre>
  
  <p>This is my <code>database.yml</code> file:</p>
  
  <pre><code>development:
    host: localhost
    adapter: postgresql
    encoding: unicode
    database: mydb
    pool: 5
    timeout: 5000
    username: postgres
    password: password
    min_messages: WARNING
  
  test:
    host: localhost
    adapter: sqlite3
    database: db/test.sqlite3
    pool: 5
    timeout: 5000
  
  production:
    adapter: postgresql
    encoding: unicode
    database: mydb
    pool: 5
    timeout: 5000
    username: postgres
    password: password
    host: 127.0.0.1
    port: 5432
    min_messages: WARNING
  </code></pre>
  
  <p>Also I try to run server Postgres:</p>
  
  <pre><code>su postgres /etc/init.d/postgresql start
  
  Password: 
   * Starting PostgreSQL 9.1 database server                                                                                                                                                       * Use of uninitialized value $info{"pgdata"} in -d at /usr/bin/pg_ctlcluster line 331.
  Use of uninitialized value $info{"pgdata"} in concatenation (.) or string at /usr/bin/pg_ctlcluster line 332.
  Error:  is not accessible or does not exist
  </code></pre>
  
  <p>Also I don't know why, but now <code>rails server</code> put this error:</p>
  
  <pre><code>=&gt; Booting Thin
  =&gt; Rails 3.2.13 application starting in development on http://0.0.0.0:3000
  =&gt; Call with -d to detach
  =&gt; Ctrl-C to shutdown server
  Exiting
  /home/home/.rvm/gems/ruby-1.9.3-p448/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1216:in `initialize': FATAL:  Peer authentication failed for user "postgres" (PG::ConnectionBad)
  </code></pre>
  
  <p>Please, help me! If you need more information - write into comments and I will update my question</p>