问题
I get the following error when starting rails server with a new app:
/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)
Here is my 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
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$
回答1:
Seems like your user cannot connect to the MySQL DB. Try these commands in your console:
mysql -u root -p
And when prompted, give the password as 'admin'
If this is possible, then you should be good to go.
回答2:
The password is wrong for the root user in your config/database.yml file. You can always use the mysqladmin command to change the root user's password if you forgot it.
回答3:
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.
development:
adapter: mysql2
database: mydb
host: localhost
username: root
password: mypass
回答4:
The answer is in your question > MYSQL error Access denied for user 'root@localhost'
Apply root user with admin password to your group_chat_development MySQL database
update It 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
# 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.
回答5:
So i was stuck with the for a while.
CHECK the file config/database.yml and check your settings.
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
mysql -u root -p
And FINALLY Close terminal and re open it, then
bundle instal
then
rails s
It seams like you have to bundle install again for the changes to take place.
Hope that helps!
回答6:
This is worked for me
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'your_password’;
mysql> FLUSH PRIVILEGES;
mysql> exit;
After the above commands try
mysql -u root -p
回答7:
If you are setting mysql root password for the first time then type following commands as follow:
mysqladmin password
You will be Prompted for new password and confirm password.
After confirmation try to login with user root and password which you have just set.
mysql root@'your-new-password'
Note : You must login as a root then only you will be able to set the mysql password.
Thanks.
回答8:
For me, Its resolved by defining the username, Instead of leaving it blank
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
development:
adapter: mysql2
database: my_db
encoding: utf8
username: root
password: # ADD DATABASE PASSWORD
host: localhost
And It works fine, Hope this will helps
回答9:
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...
回答10:
If you installed using the oracle package, try login your mysql by
mysql -u username
Then run
FLUSH PRIVILEGES;
Then set your password
SET PASSWORD FOR 'username'@'localhost' = PASSWORD('[password]');
来源：https://stackoverflow.com/questions/6886583/ruby-on-rails-mysql-error-access-denied-for-user-rootlocalhost