为Rails应用程序设置MySQL数据库时“无法通过套接字连接到本地mysql服务器”/var/run/mysqld/mysqld.sock‘“错误

Question

我一整天都在为这个工作，我需要一些帮助。

我正在尝试为我从github开发的一个RoR项目设置mysql数据库。

当我试图在终端中设置db时，会得到以下错误：

Eric-MacBook:~ eric$ cd ~/review_rocket
Eric-MacBook:review_rocket eric$ rake db:setup
Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock'

我看了20个问题，没有一个能帮我解决问题。

数据库已启动并正在运行，database.yml也已设置。

我现在有点疯狂..。请..。help...before，太晚了。

更新:我刚刚查看了我安装的宝石，由于某种原因，它显示了mysql2 (参见下面)

Eric-Reas-MacBook:~ ericrea$ gem list

*** LOCAL GEMS ***

multi_json (1.8.2)
mysql2 (0.3.13)
net-sftp (2.1.2) 

我觉得有点奇怪..。

更新:下面是我的database.yml的样子：

common: &common
  adapter: mysql2
  encoding: utf8
  reconnect: false
  pool: 5
  user_name: xxxx
  password: xxxx
  socket: /var/run/mysqld/mysqld.sock

development:
  <<: *common
  database: dev_review_rocket

# Warning: The database defined as "money_tracker_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:
  <<: *common
  database: test_review_rocket

production:
  <<: *common
  database: prod_review_rocket

更新:现在尝试用国产软件重新安装mysql时会出现奇怪的错误(请参阅下面)：

$ brew install mysql
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/mysql-5.6.1
Already downloaded: /Library/Caches/Homebrew/mysql-5.6.13.mountain_lion.bottle.1.tar.gz
==> Pouring mysql-5.6.13.mountain_lion.bottle.1.tar.gz
==> /usr/local/Cellar/mysql/5.6.13/bin/mysql_install_db --verbose --user=ericrea
2013-10-22 18:32:41 56901 [Note] InnoDB: FTS optimize thread exiting.
2013-10-22 18:32:41 56901 [Note] InnoDB: Starting shutdown...
2013-10-22 18:32:42 56901 [Note] InnoDB: Shutdown completed; log sequence number 1626067
2013-10-22 18:32:42 56901 [Note] /usr/local/Cellar/mysql/5.6.13/bin/mysqld: Shutdown complete

Warning: mysql post_install failed. Rerun with `brew postinstall mysql`.
==> Caveats
A "/etc/my.cnf" from another install may interfere with a Homebrew-built
server starting up correctly.

To connect:
    mysql -uroot

To have launchd start mysql at login:
    ln -sfv /usr/local/opt/mysql/*.plist ~/Library/LaunchAgents
Then to load mysql now:
    launchctl load ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist
Or, if you don't want/need launchctl, you can just run:
    mysql.server start
==> Summary
  /usr/local/Cellar/mysql/5.6.13: 9382 files, 354M
Eric-Reas-MacBook:~ ericrea$ brew postinstall mysql
==> /usr/local/Cellar/mysql/5.6.13/bin/mysql_install_db --verbose --user=ericrea
2013-10-22 18:33:22 57135 [Note] InnoDB: FTS optimize thread exiting.
2013-10-22 18:33:22 57135 [Note] InnoDB: Starting shutdown...
2013-10-22 18:33:23 57135 [Note] InnoDB: Shutdown completed; log sequence number 1626087
2013-10-22 18:33:23 57135 [Note] /usr/local/Cellar/mysql/5.6.13/bin/mysqld: Shutdown complete


READ THIS: https://github.com/mxcl/homebrew/wiki/troubleshooting

These open issues may also help:
    https://github.com/mxcl/homebrew/issues/22021
    https://github.com/mxcl/homebrew/pull/22480

Answer 1

最后我想出了这个问题。

我运行了以下命令：

$ mysqladmin variables | grep socket

返回：

| performance_schema_max_socket_classes                  | 12                                                                                                                                                                                                                                                                                                                                               |
| performance_schema_max_socket_instances                | 323                                                                                                                                                                                                                                                                                                                                              |
| socket                                                 | /tmp/mysql.sock

然后，我检查了我的database.yml文件中的套接字位置，这是错误的：

，这是错的。在将其更改为正确的套接字位置后，一切都像魅力一样工作。我希望这对将来的人有帮助。

Answer 2

您必须启动mysql服务器。

mysql.server start

我想你可能是在寻找

rake db:migrate

Answer 3

若要解决此错误，请先查找套接字文件，在终端中运行以下命令

mysqladmin variables | grep socket

对我来说，这意味着：

| socket              | /var/run/mysqld/mysqld.sock

然后，在config/database.yml中添加一行：

development:
adapter: mysql2
host: localhost
username: root
password: xxxx
database: xxxx
socket: /var/run/mysqld/mysqld.sock

这将解决这个问题。