如何使用 PostgreSQL 解决 Rails 中的错误 'fe_sendauth: no password supplied'？
How to resolve the error 'fe_sendauth: no password supplied' in Rails using PostgreSQL?
我尝试使用 postgresql 数据库创建我的 Rails 应用程序，但是当我开始 rails server 时，我收到了这个错误：
fe_sendauth: no password supplied
以下是我的操作步骤：
$ sudo apt-get install postgresql postgresql-contrib
$ gem install pg
$ rails new timetracker --database=postgresql --skip-unit-test
我的 database.yml 文件如下所示：
default: &default
adapter: postgresql
encoding: unicode
pool: 5
host: localhost
username: postgres
password:
development:
<<: *default
database: timetracker_development
test:
<<: *default
database: timetracker_test
production:
<<: *default
database: timetracker_production
这是我的 pg_hba.conf 文件：
# Database administrative login by Unix domain socket
local all postgres peer
# TYPE DATABASE USER ADDRESS METHOD
# "local" is for Unix domain socket connections only
local all all peer
# IPv4 local connections:
host all all 127.0.0.1/32 md5
# IPv6 local connections:
host all all ::1/128 md5
# modified by me.
host all all 127.0.0.1/32 trust
host all all 127.0.0.1/32 trust
host all all ::1/128 trust
所以，当我这样做时 rails server 我得到了错误，然后这是我这样做的结果：
$ rails c
$ ActiveRecord::Base.connection.instance_variable_get(:@config)
2.1.5 :001 > ActiveRecord::Base.connection.instance_variable_get(:@config)
PG::ConnectionBad: fe_sendauth: no password supplied
from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:655:in initialize' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:655:innew' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:655:in connect' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:242:ininitialize' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:44:in
new' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:44:in
postgresql_connection' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:438:in
new_connection' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:448:in
checkout_new_connection' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:422:in
acquire_connection' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:349:in
block in checkout' from
/home/denis/.rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/monitor.rb:211:in
mon_synchronize' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:348:in
checkout' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:263:in
block in connection' from
/home/denis/.rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/monitor.rb:211:in
mon_synchronize' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:262:in
connection' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:571:in
retrieve_connection' ... 4 levels... from
/home/denis/.rvm/gems/ruby-2.1.5/gems/railties-4.2.3/lib/rails/commands/console.rb:9:in
start' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:68:in
console' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:39:in
run_command!' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/railties-4.2.3/lib/rails/commands.rb:17:in
' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in require' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:inblock in require' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:in load_dependency' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:inrequire' from /home/denis/WEB/Rails/timetracker/bin/rails:8:in <top
(required)>' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:inload' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in block in load' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:inload_dependency' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in load' from
/home/denis/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:54:inrequire' from
/home/denis/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:54:in require' from -e:1:in'2.1.5 :002 >
我是第一次使用 postgresql，我想我只是做错了什么。
你能帮我吗？
PostgreSQL 按照指定的顺序匹配 pg_hba.conf 个条目，因此它使用预先指定的 host all all 127.0.0.1/32 md5 条目而不是您指定的 trust 条目进行身份验证。
将您的自定义 trust 条目移至预先指定的条目上方（并可选择注释掉旧条目），然后按 运行 sudo service postgresql reload（在 Ubuntu) 或重新启动。
我对这个问题的解决方案是从 default: 组中删除 host: localhost。
不知道为什么，对我来说，这条线并没有解决问题
host mydb myuser 127.0.0.1/32 trust
而这个是：
host mydb myuser localhost trust
我尝试使用 postgresql 数据库创建我的 Rails 应用程序，但是当我开始 rails server 时，我收到了这个错误：
fe_sendauth: no password supplied
以下是我的操作步骤：
$ sudo apt-get install postgresql postgresql-contrib
$ gem install pg
$ rails new timetracker --database=postgresql --skip-unit-test
我的 database.yml 文件如下所示：
default: &default
adapter: postgresql
encoding: unicode
pool: 5
host: localhost
username: postgres
password:
development:
<<: *default
database: timetracker_development
test:
<<: *default
database: timetracker_test
production:
<<: *default
database: timetracker_production
这是我的 pg_hba.conf 文件：
# Database administrative login by Unix domain socket
local all postgres peer
# TYPE DATABASE USER ADDRESS METHOD
# "local" is for Unix domain socket connections only
local all all peer
# IPv4 local connections:
host all all 127.0.0.1/32 md5
# IPv6 local connections:
host all all ::1/128 md5
# modified by me.
host all all 127.0.0.1/32 trust
host all all 127.0.0.1/32 trust
host all all ::1/128 trust
所以，当我这样做时 rails server 我得到了错误，然后这是我这样做的结果：
$ rails c
$ ActiveRecord::Base.connection.instance_variable_get(:@config)
2.1.5 :001 > ActiveRecord::Base.connection.instance_variable_get(:@config) PG::ConnectionBad: fe_sendauth: no password supplied
from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:655:in
initialize' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:655:innew' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:655:inconnect' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:242:ininitialize' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:44:innew' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:44:inpostgresql_connection' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:438:innew_connection' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:448:incheckout_new_connection' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:422:inacquire_connection' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:349:inblock in checkout' from /home/denis/.rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/monitor.rb:211:inmon_synchronize' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:348:incheckout' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:263:inblock in connection' from /home/denis/.rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/monitor.rb:211:inmon_synchronize' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:262:inconnection' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:571:inretrieve_connection' ... 4 levels... from /home/denis/.rvm/gems/ruby-2.1.5/gems/railties-4.2.3/lib/rails/commands/console.rb:9:instart' from /home/denis/.rvm/gems/ruby-2.1.5/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:68:inconsole' from /home/denis/.rvm/gems/ruby-2.1.5/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:39:inrun_command!' from /home/denis/.rvm/gems/ruby-2.1.5/gems/railties-4.2.3/lib/rails/commands.rb:17:in' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:inrequire' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:inblock in require' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:inload_dependency' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:inrequire' from /home/denis/WEB/Rails/timetracker/bin/rails:8:in<top (required)>' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:inload' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:inblock in load' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:inload_dependency' from /home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:inload' from /home/denis/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:54:inrequire' from /home/denis/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:54:inrequire' from -e:1:in'2.1.5 :002 >
我是第一次使用 postgresql，我想我只是做错了什么。
你能帮我吗？
PostgreSQL 按照指定的顺序匹配 pg_hba.conf 个条目，因此它使用预先指定的 host all all 127.0.0.1/32 md5 条目而不是您指定的 trust 条目进行身份验证。
将您的自定义 trust 条目移至预先指定的条目上方（并可选择注释掉旧条目），然后按 运行 sudo service postgresql reload（在 Ubuntu) 或重新启动。
我对这个问题的解决方案是从 default: 组中删除 host: localhost。
不知道为什么，对我来说，这条线并没有解决问题
host mydb myuser 127.0.0.1/32 trust
而这个是：
host mydb myuser localhost trust