遇到致命问题：使用 ruby​​ on rails 对用户“postgres”进行对等身份验证失败

Posted 2023-03-25

【中文标题】遇到致命问题：使用 ruby​​ on rails 对用户“postgres”进行对等身份验证失败

【英文标题】：Running into FATAL: Peer authentication failed for user "postgres" with ruby on rails

【发布时间】：2019-09-18 12:15:25

【问题描述】：

在尝试使其与 postgresql 11 一起使用时，我在使用 rails 5.2.3 时遇到了这个问题。

FATAL: Peer authentication failed for user "postgres"

我一直在检查1 和2

他们谈论 pg_hba.conf 以及如何将方法更改为 md5 或 trust。在我的硬盘中，没有这样的文件。这些档案可在 /var/lib/postgresql/11/ 中找到：

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

如果我尝试找到该文件，它将出现在此处：

$locate pg_hba.conf
/home/linuxbrew/.linuxbrew/var/postgres/pg_hba.conf

如果我进去的话，方法trust已经被使用了。

我已经卸载了 postgresql 并再次install。

这是我的 database.yml 文件：

# 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

如果我删除该行

  username: postgres

我明白了

FATAL: role "root" does not exist

【参考方案1】：

我昨天遇到了这个问题。试试这个 ... 应该这样做

default: &default
  adapter: postgresql
  pool: 5
  host: localhost

development:
  <<: *default
  database: prj_development
  username: pg_username
  password: pg_password

在让它工作时我注意到的唯一区别是host 键

host: localhost

为了确保我刚刚评论了密钥 host 并复制了以下错误

PG::ConnectionBad: FATAL: 用户“postgres”的对等身份验证失败

【参考方案2】：

您是否创建了名为postgres 的用户？如果是这样，您将为其设置密码。因此，您应该在您的 config/database.yml 文件中包含 password 属性：（最好将您的测试、开发和生产数据库名称命名为不同的名称）：

default: &default
  adapter: postgresql
  encoding: unicode
  pool: <%= ENV.fetch("RAILS_MAX_THREADS")  5  %>

development:
  <<: *default
  database: yourappname_dev
  username: postgres
  password: 1234
  host: localhost

test:
  <<: *default
  database: yourappname_test
  username: postgres
  password: 1234
  host: localhost

production:
  <<: *default
  host: localhost
  database: yourappname_prod
  password: 1234
  username: postgres

如果您不记得postgres 的密码，请通过以下命令创建一个新用户并为其设置密码，然后使用新的username 和password 更新上述代码：

$ sudo -u postgres createuser yournamehere -s
$ sudo -u postgres psql

postgres=# \password yournamehere
# enter your password

# now quit
\q

【讨论】：

感谢您的帮助 allenbrkn。我缺少主机：我的 database.yml 文件中默认为 localhost