我收到此错误，我一直在尝试从sqlite3切换到postgres。这个错误一直是我身上的一根刺。我不太清楚如何解决它。
无法为{“adapter”=＆gt;“postgresql”，“pool”=＆gt; 5，“timeout”=＆gt; 5000，“database”=＆gt;“abc”}创建数据库 无法连接到服务器：没有这样的文件或目录 服务器是在本地运行还是接受 Unix域套接字“/var/run/postgresql/.s.PGSQL.5432”上的连接？
我认为我的问题可能出在我的database.yml文件中：
default: &default
adapter: postgresql
pool: 5
timeout: 5000
development:
<<: *default
database: abc
# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
<<: *default
database: asa
production:
<<: *default
database: cba
如果您需要查看其他任何文件的外观，请参阅以下内容：https://github.com/AceConcept/Todo-App
我尝试打开应用时会发生什么情况的屏幕截图 ！http://i.imgur.com/Lxujhyt.jpg
当我使用'rake db：create'
时会发生什么
bundle exec rake db:create
(in /home/ubuntu/workspace/todo)
could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/postgresql_adapter.rb:888:in `initialize'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/postgresql_adapter.rb:888:in `new'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/postgresql_adapter.rb:888:in `connect'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/postgresql_adapter.rb:568:in `initialize'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/postgresql_adapter.rb:41:in `new'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/postgresql_adapter.rb:41:in `postgresql_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:435:in `new_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:445:in `checkout_new_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:416:in `acquire_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:351:in `block in checkout'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:350:in `checkout'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block in connection'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:541:in `retrieve_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_handling.rb:113:in `retrieve_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_handling.rb:87:in `connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/postgresql_database_tasks.rb:8:in `connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/postgresql_database_tasks.rb:17:in `create'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/database_tasks.rb:88:in `create'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/database_tasks.rb:102:in `block in create_current'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/database_tasks.rb:209:in `block in each_current_configuration'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/database_tasks.rb:208:in `each'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/database_tasks.rb:208:in `each_current_configuration'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/database_tasks.rb:101:in `create_current'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/railties/databases.rake:17:in `block (2 levels) in <top (required)>'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:240:in `call'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:240:in `block in execute'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:235:in `each'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:235:in `execute'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:179:in `block in invoke_with_call_chain'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:172:in `invoke_with_call_chain'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:165:in `invoke'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:150:in `invoke_task'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:106:in `block (2 levels) in top_level'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:106:in `each'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:106:in `block in top_level'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:115:in `run_with_threads'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:100:in `top_level'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:78:in `block in run'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:176:in `standard_exception_handling'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:75:in `run'
/usr/local/rvm/rubies/ruby-2.2.1/bin/rake:33:in `<main>'
Couldn't create database for {"adapter"=>"postgresql", "pool"=>5, "timeout"=>5000, "database"=>"abc"}
could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/postgresql_adapter.rb:888:in `initialize'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/postgresql_adapter.rb:888:in `new'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/postgresql_adapter.rb:888:in `connect'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/postgresql_adapter.rb:568:in `initialize'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/postgresql_adapter.rb:41:in `new'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/postgresql_adapter.rb:41:in `postgresql_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:435:in `new_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:445:in `checkout_new_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:416:in `acquire_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:351:in `block in checkout'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:350:in `checkout'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block in connection'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/connection_pool.rb:541:in `retrieve_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_handling.rb:113:in `retrieve_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/connection_handling.rb:87:in `connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/postgresql_database_tasks.rb:8:in `connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/postgresql_database_tasks.rb:17:in `create'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/database_tasks.rb:88:in `create'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/database_tasks.rb:102:in `block in create_current'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/database_tasks.rb:209:in `block in each_current_configuration'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/database_tasks.rb:208:in `each'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/database_tasks.rb:208:in `each_current_configuration'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/tasks/database_tasks.rb:101:in `create_current'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.5/lib/active_record/railties/databases.rake:17:in `block (2 levels) in <top (required)>'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:240:in `call'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:240:in `block in execute'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:235:in `each'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:235:in `execute'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:179:in `block in invoke_with_call_chain'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:172:in `invoke_with_call_chain'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/task.rb:165:in `invoke'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:150:in `invoke_task'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:106:in `block (2 levels) in top_level'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:106:in `each'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:106:in `block in top_level'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:115:in `run_with_threads'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:100:in `top_level'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:78:in `block in run'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:176:in `standard_exception_handling'
/usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/rake/application.rb:75:in `run'
/usr/local/rvm/rubies/ruby-2.2.1/bin/rake:33:in `<main>'
Couldn't create database for {"adapter"=>"postgresql", "pool"=>5, "timeout"=>5000, "database"=>"asasasasas"}