Rails rake db:在只读mysql数据库上中止迁移

我在使用Rails时遇到了一个问题，

rakedb:migrate

。我希望连接到现有的外部MySQL数据库，并已将我的

database.yml

配置为：

default: &default
  adapter: mysql
  pool: 5
  timeout: 5000

development:
  adapter: mysql
  host: [my_host]
  username: [my_user]
  password: [my_pass]
  database: [my_db]

test:
  <<: *default
  database: db/test.sqlite3

production:
  <<: *default
  database: db/production.sqlite3

我担心的是，当外部数据库为只读时，该命令将执行一些创建表的操作。有人知道如何通过或跳过

db:migrate

？无论如何，我不会更新数据库中的任何东西

---

非常感谢您的回复。谢谢

在这里查看其中一个答案好的，非常感谢@jvnill的链接！我会深入探讨这个问题。嘿@jvnill，似乎其中一个答案对我来说是一种魔力。如果你愿意，请写下你的答案作为评论，我会接受并投票给你：）没有必要，我真的认为这是我链接的问题的重复，所以这个问题应该真的被关闭。可能的重复

Mac-User:rails-test user$ bin/rake db:migrate RAILS_ENV=development
rake aborted!
ActiveRecord::StatementInvalid: Mysql::Error: The MySQL server is running with the --read-only option so it cannot execute this statement: CREATE TABLE `schema_migrations` (`version` varchar(255) NOT NULL) ENGINE=InnoDB
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `query'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `block in execute'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract_adapter.rb:373:in `block in log'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activesupport-4.1.6/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract_adapter.rb:367:in `log'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `execute'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract/schema_statements.rb:205:in `create_table'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:460:in `create_table'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/schema_migration.rb:29:in `create_table'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract/schema_statements.rb:656:in `initialize_schema_migrations_table'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/migration.rb:918:in `initialize'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/migration.rb:807:in `new'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/migration.rb:807:in `up'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/migration.rb:785:in `migrate'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/railties/databases.rake:34:in `block (2 levels) in <top (required)>'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:241:in `load'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:241:in `block in load'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:232:in `load_dependency'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:241:in `load'
-e:1:in `<main>'
Mysql::Error: The MySQL server is running with the --read-only option so it cannot execute this statement
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `query'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `block in execute'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract_adapter.rb:373:in `block in log'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activesupport-4.1.6/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract_adapter.rb:367:in `log'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `execute'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract/schema_statements.rb:205:in `create_table'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:460:in `create_table'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/schema_migration.rb:29:in `create_table'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/connection_adapters/abstract/schema_statements.rb:656:in `initialize_schema_migrations_table'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/migration.rb:918:in `initialize'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/migration.rb:807:in `new'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/migration.rb:807:in `up'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/migration.rb:785:in `migrate'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activerecord-4.1.6/lib/active_record/railties/databases.rake:34:in `block (2 levels) in <top (required)>'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:241:in `load'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:241:in `block in load'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:232:in `load_dependency'
/Users/ruma/.rvm/gems/ruby-2.1.3/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:241:in `load'
-e:1:in `<main>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)