遇到致命故障：用户“ postgres”的对等身份验证失败在轨道上的红宝石

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问题描述

在尝试使其与Postgresql 11配合使用时，我遇到了Rails 5.2.3的问题。

  FATAL：用户 postgres的对等身份验证失败

我一直在检查和

他们谈论 pg_hba.conf ，以及如何将方法更改为md5或trust。我的硬盘上没有这样的文件。这些归档文件位于 / var / lib / postgresql / 11 / 中：

  base pg_dynshmem pg_notify pg_snapshots pg_subtrans PG_VERSION postgresql.auto.conf 
全局pg_logical pg_replslot pg_stat pg_tblspc pg_wal postmaster.opts 
 pg_commit_ts pg_multixact pg_serial pg_stat_tmp pg_twophase pg_x $$$$  
 
 如果我尝试找到该文件，它将显示在这里：
  $ locate pg_hba.conf 
 /home/linuxbrew/.linuxbrew/var/postgres/pg_hba.conf 
  
如果我走进去，则已经使用了trust方法。
 
 
 我已经卸载了postgresql和。
 
 
 这是我的database.yml文件：
 ＃PostgreSQL。支持9.1及更高版本。 
＃
＃安装pg驱动程序：
＃gem install pg 
＃在OS X上使用Homebrew：
＃gem install pg---with-pg- config = / usr / local / bin / pg_config 
＃在带有MacPorts的OS X上：
＃gem install pg---with-pg-config = / opt / local / lib / postgresql84 / bin / pg_config 
＃在Windows上：
＃gem install pg 
＃选择win32版本。 
＃安装PostgreSQL并将其/ bin目录放在您的路径上。 
＃
＃使用Gemfile配置
＃gem'pg'
＃
默认值：& default 
适配器：postgresql 
编码：unicode 
＃有关连接池的详细信息，请参见Rails配置指南
＃http://guides.rubyonrails.org/configuring.html#database-pooling 
池：<％= ENV.fetch （ RAILS_MAX_THREADS）{5}％> 
 
开发：
<< ;： *默认
数据库：postgres 
用户名：postgres 
 #host：localhost 
池：< ;％= ENV.fetch（ RAILS_MAX_THREADS）{5}％> 
＃用于连接到postgres的指定数据库角色。 
＃要在postgres中创建其他角色，请参见`$ createuser --help`。 
＃留空时，postgres将使用默认角色。这是
＃与初始化数据库的操作系统用户相同的名称。 
 
＃与postgres角色（用户名）相关的密码。 
 
＃在TCP套接字上连接。默认情况下省略，因为客户端使用不需要配置的
＃域套接字。 Windows没有
＃域套接字，因此请取消注释这些行。 
＃主机：localhost 
 
＃服务器侦听的TCP端口。默认值为5432。
＃如果您的服务器在其他端口号上运行，请进行相应的更改。 
＃端口：5432 
 
＃架构搜索路径。服务器默认为$ user，public 
 #schema_search_path：myapp，sharedapp，public 
 
＃最小日志级别，以递增顺序：
＃debug5，debug4，debug3，debug2， debug1，
＃日志，通知，警告，错误，致命和紧急
＃默认为警告。 
 #min_messages：通知
 
＃警告：当您运行 rake时，定义为 test的数据库将被删除，并从开发数据库中重新生成
＃。 
＃请勿将此数据库设置为与开发或生产相同的数据库。 
测试：
< :: *默认
数据库：postgres 
用户名：postgres 
主机：localhost 
池：5 
 
 
 
 
＃与config / secrets.yml一样，您永远都不想在源代码中存储敏感信息，例如数据库密码，
＃。如果您的源代码是任何人都曾经看过的
＃，那么他们现在就可以访问您的数据库。 
＃
＃而是在启动
＃应用程序时提供密码作为Unix环境变量。请阅读http://guides.rubyonrails.org/configuring.html#configuring-a-database 
＃，以获取有关如何在
＃生产部署中提供这些环境变量的完整摘要。 
＃
＃在Heroku和其他平台提供商上，您可能具有完整的连接URL 
＃作为环境变量。例如：
＃
＃DATABASE_URL = postgres：// myuser：mypass @ localhost / somedatabase 
＃
＃您可以使用此数据库配置：
 ＃
＃生产：
＃网址：<％= ENV ['DATABASE_URL']％> 
＃
生产：
<< ;： *默认
数据库：postgres 
用户名：postgres 
  
如果我删除行
 用户名：postgres 
  
我得到
 致命：角色根不存在
  
 
 
解决方案
我昨天遇到了这个问题。试试这个... 
这应该做
 默认值：& default 
适配器：postgresql 
池：5 
主机：localhost 
 
开发：
<< ;: *默认
数据库：prj_development 
用户名：pg_username 
密码：pg_password 
  
我在使它起作用时唯一注意到的区别是主机键
 主机：localhost 
  
为了确保我只注释了键 host 并重现了以下错误
 
I am running into this problem with rails 5.2.3 when trying to make it work with postgresql 11.
FATAL: Peer authentication failed for user "postgres"
I have been checking 1 and 2
They talk about pg_hba.conf and how the methods should be changed to md5 or trust. In my hard disk, there is no such file. These archives are found within /var/lib/postgresql/11/ :
base          pg_dynshmem   pg_notify    pg_snapshots  pg_subtrans  PG_VERSION  postgresql.auto.conf
global        pg_logical    pg_replslot  pg_stat       pg_tblspc    pg_wal  postmaster.opts
pg_commit_ts  pg_multixact  pg_serial    pg_stat_tmp   pg_twophase  pg_xact postmaster.pid
If I try to locate the file it will appear here:
$locate pg_hba.conf
/home/linuxbrew/.linuxbrew/var/postgres/pg_hba.conf
If I go inside, the method trust is already used.
I have already uninstalled postgresql and install it again.
This is my database.yml file:
# PostgreSQL. Versions 9.1 and up are supported.
#
# Install the pg driver:
#   gem install pg
# On OS X with Homebrew:
#   gem install pg -- --with-pg-config=/usr/local/bin/pg_config
# On OS X with MacPorts:
#   gem install pg -- --with-pg-config=/opt/local/lib/postgresql84/bin/pg_config
# On Windows:
#   gem install pg
#       Choose the win32 build.
#       Install PostgreSQL and put its /bin directory on your path.
#
# Configure Using Gemfile
# gem 'pg'
#
default: &default
  adapter: postgresql
  encoding: unicode
  # For details on connection pooling, see Rails configuration guide
  # http://guides.rubyonrails.org/configuring.html#database-pooling
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>

development:
  <<: *default
  database: postgres
  username: postgres
  #host: localhost
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  # The specified database role being used to connect to postgres.
  # To create additional roles in postgres see `$ createuser --help`.
  # When left blank, postgres will use the default role. This is
  # the same name as the operating system user that initialized the database.

  # The password associated with the postgres role (username).

  # Connect on a TCP socket. Omitted by default since the client uses a
  # domain socket that doesn't need configuration. Windows does not have
  # domain sockets, so uncomment these lines.
  #host: localhost

  # The TCP port the server listens on. Defaults to 5432.
  # If your server runs on a different port number, change accordingly.
   # port: 5432

  # Schema search path. The server defaults to $user,public
  #schema_search_path: myapp,sharedapp,public

  # Minimum log levels, in increasing order:
  #   debug5, debug4, debug3, debug2, debug1,
  #   log, notice, warning, error, fatal, and panic
  # Defaults to warning.
  #min_messages: notice

# 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: postgres
  username: postgres
  host: localhost
  pool: 5




# As with config/secrets.yml, you never want to store sensitive information,
# like your database password, in your source code. If your source code is
# ever seen by anyone, they now have access to your database.
#
# Instead, provide the password as a unix environment variable when you boot
# the app. Read http://guides.rubyonrails.org/configuring.html#configuring-a-database
# for a full rundown on how to provide these environment variables in a
# production deployment.
#
# On Heroku and other platform providers, you may have a full connection URL
# available as an environment variable. For example:
#
#   DATABASE_URL="postgres://myuser:mypass@localhost/somedatabase"
#
# You can use this database configuration with:
#
#   production:
#     url: <%= ENV['DATABASE_URL'] %>
#
production:
  <<: *default
  database: postgres
  username: postgres
If I remove the line 
  username: postgres
I get 
FATAL: role "root" does not exist
 解决方案 
I had faced this issue yesterday. Try this ...This should do
default: &default
  adapter: postgresql
  pool: 5
  host: localhost

development:
  <<: *default
  database: prj_development
  username: pg_username
  password: pg_password
The only difference I noticed while making it work was the host key
host: localhost
To make sure I just commented the key host and reproduced the following error
                        
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