很长一段时间后我回到了Rails，现在我正在开发一个用于学习的演示项目，并希望用Postgresql生成应用程序，它给了我一个错误。我使用postgresql适配器生成了一个新的Rails 5应用程序，但是当我尝试使用rails db:create创建数据库时，它给了我以下错误：
FATAL: Peer authentication failed for user "postgres"
Couldn't create database for {"adapter"=>"postgresql", "encoding"=>"unicode", "pool"=>5, "database"=>"myapp_development", "username"=>"postgres", "password"=>"mypassword"}
rails aborted!
PG::ConnectionBad: FATAL: Peer authentication failed for user "postgres"
/home/indu/.rvm/gems/ruby-2.5.0/gems/pg-0.21.0/lib/pg.rb:56:in `initialize'
/home/indu/.rvm/gems/ruby-2.5.0/gems/pg-0.21.0/lib/pg.rb:56:in `new'
/home/indu/.rvm/gems/ruby-2.5.0/gems/pg-0.21.0/lib/pg.rb:56:in `connect'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/connection_adapters/postgresql_adapter.rb:671:in `connect'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/connection_adapters/postgresql_adapter.rb:217:in `initialize'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/connection_adapters/postgresql_adapter.rb:37:in `new'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/connection_adapters/postgresql_adapter.rb:37:in `postgresql_connection'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:729:in `new_connection'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:773:in `checkout_new_connection'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:752:in `try_to_checkout_new_connection'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:713:in `acquire_connection'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:490:in `checkout'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:364:in `connection'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/connection_adapters/abstract/connection_pool.rb:883:in `retrieve_connection'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/connection_handling.rb:128:in `retrieve_connection'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/connection_handling.rb:91:in `connection'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/tasks/postgresql_database_tasks.rb:6:in `connection'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/tasks/postgresql_database_tasks.rb:15:in `create'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/tasks/database_tasks.rb:109:in `create'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/tasks/database_tasks.rb:129:in `block in create_current'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/tasks/database_tasks.rb:294:in `block in each_current_configuration'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/tasks/database_tasks.rb:293:in `each'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/tasks/database_tasks.rb:293:in `each_current_configuration'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/tasks/database_tasks.rb:128:in `create_current'
/home/indu/.rvm/gems/ruby-2.5.0/gems/activerecord-5.0.6/lib/active_record/railties/databases.rake:27:in `block (2 levels) in <top (required)>'
/home/indu/.rvm/gems/ruby-2.5.0/gems/railties-5.0.6/lib/rails/commands/rake_proxy.rb:14:in `block in run_rake_task'
/home/indu/.rvm/gems/ruby-2.5.0/gems/railties-5.0.6/lib/rails/commands/rake_proxy.rb:11:in `run_rake_task'
/home/indu/.rvm/gems/ruby-2.5.0/gems/railties-5.0.6/lib/rails/commands/commands_tasks.rb:51:in `run_command!'
/home/indu/.rvm/gems/ruby-2.5.0/gems/railties-5.0.6/lib/rails/commands.rb:18:in `<top (required)>'
/home/indu/Projects/myapp/bin/rails:9:in `require'
/home/indu/Projects/myapp/bin/rails:9:in `<top (required)>'
/home/indu/.rvm/gems/ruby-2.5.0/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `load'
/home/indu/.rvm/gems/ruby-2.5.0/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `call'
/home/indu/.rvm/gems/ruby-2.5.0/gems/spring-2.0.2/lib/spring/client/command.rb:7:in `call'
/home/indu/.rvm/gems/ruby-2.5.0/gems/spring-2.0.2/lib/spring/client.rb:30:in `run'
/home/indu/.rvm/gems/ruby-2.5.0/gems/spring-2.0.2/bin/spring:49:in `<top (required)>'
/home/indu/.rvm/gems/ruby-2.5.0/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `load'
/home/indu/.rvm/gems/ruby-2.5.0/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `<top (required)>'
/home/indu/Projects/myapp/bin/spring:15:in `require'
/home/indu/Projects/myapp/bin/spring:15:in `<top (required)>'
bin/rails:3:in `load'
bin/rails:3:in `<main>'
Tasks: TOP => db:create
(See full trace by running task with --trace)
以下是我的database.yml文件。
default: &default
adapter: postgresql
encoding: unicode
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
development:
<<: *default
database: myapp_development
username: postgres
password: mypassword
test:
<<: *default
database: myapp_test
username: postgres
password: mypassword
production:
<<: *default
database: myapp_production
username: myapp
password: <%= ENV['MYAPP_DATABASE_PASSWORD'] %>
先感谢您！