编辑：通过将行host: 127.0.0.1添加到开发部分的database.yml中，我可以解决以下问题。但是，现在我被拒绝对数据库进行任何更改的权限，新错误是：
rake db:create
PG::InsufficientPrivilege: ERROR: permission denied to create database
: CREATE DATABASE "building_the_history_development" ENCODING = 'unicode'
Couldn't create database for {"host"=>"127.0.0.1", "adapter"=>"postgresql", "encoding"=>"unicode", "pool"=>5, "database"=>"building_the_history_development"}
rake aborted!
ActiveRecord::StatementInvalid: PG::InsufficientPrivilege: ERROR: permission denied to create database
: CREATE DATABASE "building_the_history_development" ENCODING = 'unicode'
Caused by:
PG::InsufficientPrivilege: ERROR: permission denied to create database
Tasks: TOP => db:create
(See full trace by running task with --trace)
我有一个Rails应用程序，该应用程序是在本地Windows C：/驱动器上创建的，但是正在通过Linux bash（Windows子系统上的Linux）对其进行操作。我已经通过Bash命令行成功下载并安装了Windows的PSQL，pg的gem和postgres。我可以正常启动Rails服务器，也可以通过sudo service postgresql start启动postgresql。我的pg_hba.conf文件已经设置为信任127.0.0.1/32上的连接。
但是，每当我尝试执行与数据库相关的任何操作时，它都会失败，并显示以下错误：
<user_profile>@HOU-850G3-18:building_the_history$ rails db:migrate --trace
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/railties-5.2.0/lib/rails/app_loader.rb:53: warning: Insecure world writable dir /home/<user_profile>/.rbenv/versions in PATH, mode 040777
** Invoke db:migrate (first_time)
** Invoke db:load_config (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:load_config
** Execute db:migrate
rails aborted!
PG::ConnectionBad: 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"?
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/pg-1.0.0/lib/pg.rb:56:in `initialize'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/pg-1.0.0/lib/pg.rb:56:in `new'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/pg-1.0.0/lib/pg.rb:56:in `connect'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/postgresql_adapter.rb:684:in `connect'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/postgresql_adapter.rb:215:in `initialize'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/postgresql_adapter.rb:40:in `new'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/postgresql_adapter.rb:40:in `postgresql_connection'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:809:in `new_connection'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:853:in `checkout_new_connection'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:832:in `try_to_checkout_new_connection'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:793:in `acquire_connection'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:521:in `checkout'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:380:in `connection'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:1008:in `retrieve_connection'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/connection_handling.rb:118:in `retrieve_connection'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/connection_handling.rb:90:in `connection'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/tasks/database_tasks.rb:172:in `migrate'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0/lib/active_record/railties/databases.rake:60:in `block (2 levels) in <main>'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rake-12.3.1/lib/rake/task.rb:271:in `block in execute'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rake-12.3.1/lib/rake/task.rb:271:in `each'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rake-12.3.1/lib/rake/task.rb:271:in `execute'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rake-12.3.1/lib/rake/task.rb:213:in `block in invoke_with_call_chain'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/2.5.0/monitor.rb:226:in `mon_synchronize'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rake-12.3.1/lib/rake/task.rb:193:in `invoke_with_call_chain'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rake-12.3.1/lib/rake/task.rb:182:in `invoke'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rake-12.3.1/lib/rake/application.rb:160:in `invoke_task'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rake-12.3.1/lib/rake/application.rb:116:in `block (2 levels) in top_level'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rake-12.3.1/lib/rake/application.rb:116:in `each'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rake-12.3.1/lib/rake/application.rb:116:in `block in top_level'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rake-12.3.1/lib/rake/application.rb:125:in `run_with_threads'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rake-12.3.1/lib/rake/application.rb:110:in `top_level'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/railties-5.2.0/lib/rails/commands/rake/rake_command.rb:23:in `block in perform'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rake-12.3.1/lib/rake/application.rb:186:in `standard_exception_handling'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/railties-5.2.0/lib/rails/commands/rake/rake_command.rb:20:in `perform'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/railties-5.2.0/lib/rails/command.rb:48:in `invoke'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/railties-5.2.0/lib/rails/commands.rb:18:in `<main>'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:283:in `block in require'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:249:in `load_dependency'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:283:in `require'
/mnt/c/Users/emikai/Dropbox/Coding/Personal Projects/building_the_history/bin/rails:9:in `<top (required)>'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `load'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `call'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.0.2/lib/spring/client/command.rb:7:in `call'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.0.2/lib/spring/client.rb:30:in `run'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.0.2/bin/spring:49:in `<top (required)>'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `load'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `<top (required)>'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:70:in `require'
/home/<user_profile>/.rbenv/versions/2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:70:in `require'
/mnt/c/Users/emikai/Dropbox/Coding/Personal Projects/building_the_history/bin/spring:15:in `<top (required)>'
bin/rails:3:in `load'
bin/rails:3:in `<main>'
Tasks: TOP => db:migrate
<user_profile>@HOU-850G3-18:building_the_history$
运行ps -ef | grep postgres可为我提供以下信息：
postgres 96 1 0 16:19 ? 00:00:01 /usr/lib/postgresql/9.5/bin/postgres -D /var/lib/postgresql/9.5/main -c config_file=/etc/postgresql/9.5/main/postgresql.conf
postgres 119 96 0 16:19 ? 00:00:00 postgres: checkpointer process
postgres 120 96 0 16:19 ? 00:00:00 postgres: writer process
postgres 121 96 0 16:19 ? 00:00:00 postgres: wal writer process
postgres 122 96 0 16:19 ? 00:00:00 postgres: autovacuum launcher process
postgres 123 96 0 16:19 ? 00:00:00 postgres: stats collector process
emikaij+ 512 166 0 16:29 tty2 00:00:00 grep --color=auto postgres