호스트 이름 "postgres"를 주소로 변환 할 수 없습니다 : 이름 또는 서비스를 알 수 없음 (PG :: ConnectionBad)

Ruby 2.2.2 (우분투 16.04 실행)에서 Rails 4.2.3 프로젝트를 진행하고 있습니다. 그것은 괜찮 았지만, 잠시 후에 다시 방문한 후에는 봉사 할 수 없었습니다. 검색을 시도했지만 모든 상황이 도움이되지 않습니다. 다음은 오류 로그입니다 :호스트 이름 "postgres"를 주소로 변환 할 수 없습니다 : 이름 또는 서비스를 알 수 없음 (PG :: ConnectionBad)

[email protected]:~/Documents/projects/proj$ rs 
=> Booting Puma 
=> Rails 4.2.3 application starting in development on http://localhost:3000 
=> Run `rails server -h` for more startup options 
=> Ctrl-C to shutdown server 
Exiting 
/home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:655:in `initialize': could not translate host name "postgres" to address: Name or service not known (PG::ConnectionBad) 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:655:in `new' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:655:in `connect' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:242:in `initialize' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:44:in `new' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:44:in `postgresql_connection' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:438:in `new_connection' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:448:in `checkout_new_connection' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:422:in `acquire_connection' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:349:in `block in checkout' 
    from /home/bigzoo/.rbenv/versions/2.2.2/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:348:in `checkout' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:263:in `block in connection' 
    from /home/bigzoo/.rbenv/versions/2.2.2/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:262:in `connection' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:571:in `retrieve_connection' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_handling.rb:113:in `retrieve_connection' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_handling.rb:87:in `connection' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/querying.rb:39:in `find_by_sql' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/relation.rb:638:in `exec_queries' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/relation.rb:514:in `load' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/relation.rb:243:in `to_a' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/relation/delegation.rb:46:in `map' 
    from /home/bigzoo/Documents/projects/proj/app/admin/product.rb:62:in `block in <top (required)>' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin/dsl.rb:15:in `instance_exec' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin/dsl.rb:15:in `run_registration_block' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin/namespace.rb:223:in `parse_registration_block' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin/namespace.rb:48:in `register' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin/application.rb:154:in `register' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin.rb:75:in `register' 
    from /home/bigzoo/Documents/projects/proj/app/admin/product.rb:1:in `<top (required)>' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in `load' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in `block in load' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:in `load_dependency' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in `load' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin/application.rb:212:in `block in load' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin/error.rb:41:in `capture' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin/application.rb:212:in `load' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin/application.rb:204:in `block in load!' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin/application.rb:204:in `each' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin/application.rb:204:in `load!' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin/application.rb:226:in `routes' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/bundler/gems/activeadmin-21f76b1faf65/lib/active_admin.rb:79:in `routes' 
    from /home/bigzoo/Documents/projects/proj/config/routes.rb:20:in `block in <top (required)>' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/actionpack-4.2.3/lib/action_dispatch/routing/route_set.rb:434:in `instance_exec' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/actionpack-4.2.3/lib/action_dispatch/routing/route_set.rb:434:in `eval_block' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/actionpack-4.2.3/lib/action_dispatch/routing/route_set.rb:412:in `draw' 
    from /home/bigzoo/Documents/projects/proj/config/routes.rb:1:in `<top (required)>' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in `load' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in `block in load' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:in `load_dependency' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in `load' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application/routes_reloader.rb:40:in `block in load_paths' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application/routes_reloader.rb:40:in `each' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application/routes_reloader.rb:40:in `load_paths' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application/routes_reloader.rb:16:in `reload!' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application/routes_reloader.rb:26:in `block in updater' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/file_update_checker.rb:75:in `call' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/file_update_checker.rb:75:in `execute' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application/routes_reloader.rb:27:in `updater' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application/routes_reloader.rb:7:in `execute_if_updated' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application/finisher.rb:69:in `block in <module:Finisher>' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:30:in `instance_exec' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:30:in `run' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:55:in `block in run_initializers' 
    from /home/bigzoo/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:226:in `block in tsort_each' 
    from /home/bigzoo/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component' 
    from /home/bigzoo/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:429:in `each_strongly_connected_component_from' 
    from /home/bigzoo/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:347:in `block in each_strongly_connected_component' 
    from /home/bigzoo/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:345:in `each' 
    from /home/bigzoo/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:345:in `call' 
    from /home/bigzoo/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:345:in `each_strongly_connected_component' 
    from /home/bigzoo/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:224:in `tsort_each' 
    from /home/bigzoo/.rbenv/versions/2.2.2/lib/ruby/2.2.0/tsort.rb:203:in `tsort_each' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:54:in `run_initializers' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application.rb:352:in `initialize!' 
    from /home/bigzoo/Documents/projects/proj/config/environment.rb:5:in `<top (required)>' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `require' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `block in require' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:in `load_dependency' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `require' 
    from /home/bigzoo/Documents/projects/proj/config.ru:3:in `block in <main>' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/rack-1.6.5/lib/rack/builder.rb:55:in `instance_eval' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/rack-1.6.5/lib/rack/builder.rb:55:in `initialize' 
    from /home/bigzoo/Documents/projects/proj/config.ru:in `new' 
    from /home/bigzoo/Documents/projects/proj/config.ru:in `<main>' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/rack-1.6.5/lib/rack/builder.rb:49:in `eval' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/rack-1.6.5/lib/rack/builder.rb:49:in `new_from_string' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/rack-1.6.5/lib/rack/builder.rb:40:in `parse_file' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/rack-1.6.5/lib/rack/server.rb:299:in `build_app_and_options_from_config' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/rack-1.6.5/lib/rack/server.rb:208:in `app' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/commands/server.rb:61:in `app' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/rack-1.6.5/lib/rack/server.rb:336:in `wrapped_app' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/commands/server.rb:139:in `log_to_stdout' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/commands/server.rb:78:in `start' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:80:in `block in server' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:75:in `tap' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:75:in `server' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:39:in `run_command!' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/commands.rb:17:in `<top (required)>' 
    from /home/bigzoo/Documents/projects/proj/bin/rails:8:in `require' 
    from /home/bigzoo/Documents/projects/proj/bin/rails:8:in `<top (required)>' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/spring-1.3.6/lib/spring/client/rails.rb:28:in `load' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/spring-1.3.6/lib/spring/client/rails.rb:28:in `call' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/spring-1.3.6/lib/spring/client/command.rb:7:in `call' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/spring-1.3.6/lib/spring/client.rb:26:in `run' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/spring-1.3.6/bin/spring:48:in `<top (required)>' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/spring-1.3.6/lib/spring/binstub.rb:11:in `load' 
    from /home/bigzoo/Documents/projects/proj/.bundle/ruby/2.2.0/gems/spring-1.3.6/lib/spring/binstub.rb:11:in `<top (required)>' 
    from /home/bigzoo/.rbenv/versions/2.2.2/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require' 
    from /home/bigzoo/.rbenv/versions/2.2.2/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require' 
    from /home/bigzoo/Documents/projects/proj/bin/spring:13:in `<top (required)>' 
    from bin/rails:3:in `load' 
    from bin/rails:3:in `<main>'

유일한 문제는 포스트 그레스에 연결하는 것으로 보인다.

추신. 나는 누군가가 그것을 강요한다고 느끼면 이미 unset DATABASE_URL을 실행 해 보았습니다.

추가 정보 :

[email protected]:~/Documents/projects/proj$ sudo netstat -atpn | grep 5432 
[sudo] password for bigzoo: 
tcp  0  0 127.0.0.1:5432   0.0.0.0:*    LISTEN  1744/postgres

출처

2017-10-25 bigzoo

당신의 프로젝트 오류 스택은 당신이 루비 2.2.0을 사용하고 있다고 말했을 뿐이지 만 당신이 2.2.2라고 말한 질문에서 내가 틀렸다면 수정하십시오. –

'/ etc/hosts' 파일에'127.0.0.1 postgres' 줄을 추가하는 것 (또는'127.0.0.1'로 시작하는 줄에'postgres'를 추가하는 것)이 도움이 될 것입니다. – mudasobwa

설정 파일에있는 DB의 호스트 이름이'127.0.0.1' 또는'localhost' 대신'postgres' 인 것 같습니다 – spuyet

/etc/hosts 파일에 아래 라인을 추가 트릭을했다.

127.0.0.1 postgres

트릭을 수행했습니다.

레일즈는 호스트 이름 인 postgres를 사용하고 포스트 그레스를 시스템에 연결하여 필요에 따라 포스트그레스를 호스트와 포트에 연결합니다. 위의 행은 어떤 이유로 작동하지 않으면 매핑을 수행합니다.

크레디트 @mudasobwa.

추신. 새와는 곳/등은/호스트 그냥

sudo nano /etc/hosts

을 열고 라인을 추가하려면 (bash는) 유형입니다 모르는 경우.

출처

2017-10-25 18:00:38 bigzoo

호스트 이름 "postgres"를 주소로 변환 할 수 없습니다 : 이름 또는 서비스를 알 수 없음 (PG :: ConnectionBad)

답변

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