Ruby on Rails MYSQL 错误用户“root@localhost”拒绝访问

Ruby on Rails MYSQL error Access denied for user 'root@localhost'

提问by user852974

I get the following error when starting rails server with a new app:

使用新应用程序启动 rails 服务器时出现以下错误：

/Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.2.6/lib/mysql2/client.rb:37:in `connect': Access denied for user 'root'@'localhost' (using password: YES) (Mysql2::Error)

/Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.2.6/lib/mysql2/client.rb:37:in `connect'：用户'root'@'拒绝访问localhost'（使用密码：YES）（Mysql2::Error）

Here is my database.yml

这是我的database.yml

# MySQL.  Versions 4.1 and 5.0 are recommended.
#
# Install the MySQL driver:
#   gem install mysql2
#
# And be sure to use new-style password hashing:
#   http://dev.mysql.com/doc/refman/5.0/en/old-client.html
development:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: group_chat_development
  pool: 5
  username: root
  password: admin
  socket: /tmp/mysql.sock

# 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:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: group_chat_test
  pool: 5
  username: root
  password: admin
  socket: /tmp/mysql.sock

production:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: group_chat_production
  pool: 5
  username: root
  password: admin
  socket: /tmp/mysql.sock

Below is the full error message

以下是完整的错误信息

MacPro:FireDemon fred$ rails s
=> Booting Mongrel
=> Rails 3.0.3 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Exiting
/Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.2.6/lib/mysql2/client.rb:37:in `connect': Access denied for user 'root'@'localhost' (using password: YES) (Mysql2::Error)
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.2.6/lib/mysql2/client.rb:37:in `initialize'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.2.6/lib/active_record/connection_adapters/mysql2_adapter.rb:14:in `new'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/mysql2-0.2.6/lib/active_record/connection_adapters/mysql2_adapter.rb:14:in `mysql2_connection'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:228:in `new_connection'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:236:in `checkout_new_connection'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in `block (2 levels) in checkout'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:186:in `loop'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:186:in `block in checkout'
    from /Users/fred/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:185:in `checkout'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:93:in `connection'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:316:in `retrieve_connection'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_specification.rb:97:in `retrieve_connection'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_specification.rb:89:in `connection'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/base.rb:1330:in `replace_bind_variables'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/base.rb:1317:in `sanitize_sql_array'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/base.rb:1224:in `sanitize_sql_for_conditions'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/relation/query_methods.rb:206:in `build_where'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/relation/query_methods.rb:77:in `where'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/base.rb:441:in `where'
    from /Users/fred/Desktop/FireDemon/app/models/user.rb:14:in `<class:User>'
    from /Users/fred/Desktop/FireDemon/app/models/user.rb:1:in `<top (required)>'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:454:in `load'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:454:in `block in load_file'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:596:in `new_constants_in'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:453:in `load_file'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:340:in `require_or_load'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:491:in `load_missing_constant'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:183:in `block in const_missing'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:181:in `each'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:181:in `const_missing'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/inflector/methods.rb:124:in `block in constantize'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/inflector/methods.rb:123:in `each'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/inflector/methods.rb:123:in `constantize'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/core_ext/string/inflections.rb:43:in `constantize'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activemodel-3.0.3/lib/active_model/observing.rb:182:in `observed_class'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activemodel-3.0.3/lib/active_model/observing.rb:175:in `observed_classes'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activemodel-3.0.3/lib/active_model/observing.rb:195:in `observed_classes'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activemodel-3.0.3/lib/active_model/observing.rb:191:in `initialize'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/observer.rb:96:in `initialize'
    from /Users/fred/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/singleton.rb:109:in `new'
    from /Users/fred/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/singleton.rb:109:in `block in instance'
    from <internal:prelude>:10:in `synchronize'
    from /Users/fred/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/singleton.rb:107:in `instance'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activemodel-3.0.3/lib/active_model/observing.rb:66:in `instantiate_observer'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activemodel-3.0.3/lib/active_model/observing.rb:39:in `block in instantiate_observers'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activemodel-3.0.3/lib/active_model/observing.rb:39:in `each'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activemodel-3.0.3/lib/active_model/observing.rb:39:in `instantiate_observers'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/railtie.rb:83:in `block (2 levels) in <class:Railtie>'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/lazy_load_hooks.rb:26:in `on_load'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.3/lib/active_record/railtie.rb:82:in `block in <class:Railtie>'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/lazy_load_hooks.rb:34:in `call'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/lazy_load_hooks.rb:34:in `execute_hook'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/lazy_load_hooks.rb:42:in `each'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/application/finisher.rb:46:in `block in <module:Finisher>'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/initializable.rb:25:in `instance_exec'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/initializable.rb:25:in `run'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/initializable.rb:50:in `block in run_initializers'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/initializable.rb:49:in `each'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/initializable.rb:49:in `run_initializers'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/application.rb:134:in `initialize!'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/application.rb:77:in `method_missing'
    from /Users/fred/Desktop/FireDemon/config/environment.rb:5:in `<top (required)>'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:239:in `require'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:239:in `block in require'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:596:in `new_constants_in'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.0.3/lib/active_support/dependencies.rb:239:in `require'
    from /Users/fred/Desktop/FireDemon/config.ru:3:in `block in <main>'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.1/lib/rack/builder.rb:46:in `instance_eval'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.1/lib/rack/builder.rb:46:in `initialize'
    from /Users/fred/Desktop/FireDemon/config.ru:1:in `new'
    from /Users/fred/Desktop/FireDemon/config.ru:1:in `<main>'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.1/lib/rack/builder.rb:35:in `eval'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.1/lib/rack/builder.rb:35:in `parse_file'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.1/lib/rack/server.rb:162:in `app'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.1/lib/rack/server.rb:248:in `wrapped_app'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/rack-1.2.1/lib/rack/server.rb:213:in `start'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/commands/server.rb:65:in `start'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/commands.rb:30:in `block in <top (required)>'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/commands.rb:27:in `tap'
    from /Users/fred/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.3/lib/rails/commands.rb:27:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'
MacPro:FireDemon fred$ 

采纳答案by sameera207

Seems like your user cannot connect to the MySQL DB. Try these commands in your console:

似乎您的用户无法连接到 MySQL 数据库。在您的控制台中尝试这些命令：

mysql -u root -p

And when prompted, give the password as 'admin'

出现提示时，将密码设为“admin”

If this is possible, then you should be good to go.

如果这是可能的，那么你应该很高兴。

回答by Chris Ledet

The password is wrong for the root user in your config/database.ymlfile. You can always use the mysqladmincommand to change the root user's password if you forgot it.

config/database.yml文件中root 用户的密码错误。mysqladmin如果您忘记了 root 用户的密码，您可以随时使用该命令来更改它。

回答by lucygenik

Handy home hint - I was stuck on this too but found that loopback (127.0.0.1) != 'localhost'... I had host: 127.0.0.1 and was seeing this exact problem. A quick change to 'localhost' fixed this for me... hope it helps someone.

方便的主页提示 - 我也被困在这个问题上，但发现环回 (127.0.0.1) != 'localhost'...我有主机：127.0.0.1 并且看到了这个确切的问题。对“本地主机”的快速更改为我解决了这个问题……希望它对某人有所帮助。

development:
 adapter: mysql2
 database: mydb
 host: localhost
 username: root
 password: mypass

回答by Deepak Nagar

This is worked for me

这对我有用

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'your_password';?

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'your_password';?

mysql> FLUSH PRIVILEGES;
mysql> exit;

After the above commands try

上面的命令尝试后

mysql -u root -p

回答by Sabba Keynejad

So i was stuck with the problem for a while.

所以我被这个问题困扰了一段时间。

CHECK the file config/database.yml and check your settings.

检查文件 config/database.yml 并检查您的设置。

default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: root
  socket: ( check what your socket location is by typing mysqladmin version into termnal)

Then Go into terminal and type

然后进入终端并输入

mysql -u root -p

And FINALLY Close terminal and re open it, then

最后关闭终端并重新打开它，然后

bundle install

then

然后

rails s

It seams like you have to bundle install again for the changes to take place.

看起来您必须再次捆绑安装才能进行更改。

Hope that helps!

希望有帮助！

回答by jamesc

The answer is in your question > MYSQL error Access denied for user 'root@localhost'

答案在您的问题中 > MYSQL 错误 Access denied for user 'root@localhost'

Apply root user with admin password to your group_chat_development MySQL database

将具有管理员密码的 root 用户应用到您的 group_chat_development MySQL 数据库

updateIt occurs to me that you may not wish to be using msQL at all for your dev and test databases in which case change you database.yml file test and development settings to

更新我发现您可能根本不希望将 msQL 用于开发和测试数据库，在这种情况下，请将 database.yml 文件测试和开发设置更改为

# SQLite version 3.x
#   gem install sqlite3-ruby (not necessary on OS X Leopard)
development:
  adapter: sqlite3
  database: db/development.sqlite3
  pool: 5
  timeout: 5000

# 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:
  adapter: sqlite3
  database: db/test.sqlite3
  pool: 5
  timeout: 5000

If you do not know how to use MySQL tools then you should get used to using them very soon as you most likely will need them in your production server environment You will find links to the relevant version on MySQL that you are using here http://dev.mysql.com/doc/Use MySQL Administrator to set your user permissions.

如果您不知道如何使用 MySQL 工具，那么您应该很快习惯使用它们，因为您很可能在您的生产服务器环境中需要它们您将在此处找到您正在使用的 MySQL 相关版本的链接http:/ /dev.mysql.com/doc/使用 MySQL Administrator 设置您的用户权限。

回答by Santosh Singh-Bagadhbilla

If you are setting mysql root password for the first time then type following commands as follow:

如果您是第一次设置 mysql root 密码，请输入以下命令，如下所示：

mysqladmin password

管理员密码

You will be Prompted for new password and confirm password.

系统将提示您输入新密码和确认密码。

After confirmation try to login with user root and password which you have just set.

确认后尝试使用您刚刚设置的用户 root 和密码登录。

mysql root@'your-new-password'

mysql root@'你的新密码'

Note : You must login as a root then only you will be able to set the mysql password.

注意：您必须以 root 身份登录，然后才能设置 mysql 密码。

Thanks.

谢谢。

回答by Hussam Kurd

For me, Its resolved by defining the username, Instead of leaving it blank

对我来说，它通过定义用户名来解决，而不是将其留空

development:
    adapter: mysql2
    database: my_db
    encoding: utf8
    username: # ADD DATABASE USERNAME
    password: # ADD DATABASE PASSWORD
    host: localhost

So I just change it for all the databases to the following

所以我只是将所有数据库的它更改为以下内容

development:
    adapter: mysql2
    database: my_db
    encoding: utf8
    username: root
    password: # ADD DATABASE PASSWORD
    host: localhost

And It works fine, Hope this will helps

它工作正常，希望这会有所帮助

回答by Edmund Lee

If you installed using the oracle package, try login your mysql by

如果您使用 oracle 包安装，请尝试通过以下方式登录您的 mysql

mysql -u username

Then run

然后运行

FLUSH PRIVILEGES;

Then set your password

然后设置密码

SET PASSWORD FOR 'username'@'localhost' = PASSWORD('[password]');

回答by Ramesh

you should give the " host: " field in the devlepment in database.yml file. that host name must be " IP " address,like "127.0.0.1" or some thing.. ie " host: 127.0.0.1 " and again restart the server and type on the address like ' 127.0.0.1:3000 ' here 3000 is the port nomber...

您应该在 database.yml 文件的 devlepment 中提供“host:”字段。该主机名必须是“ IP ”地址，例如“ 127.0.0.1”或某些东西..即“主机：127.0.0.1”并再次重新启动服务器并键入地址，例如'127.0.0.1:3000'这里3000是端口号...