使用 capistrano、passenger 和 apache 部署 rails

Question

我最近设置了一个 VPS，并正在尝试部署一个 rails 应用程序。我观看了一个截屏视频：http://railscasts.com/episodes/335-deploying-to-a-vps，其中解释了如何使用 nginx 设置 capistrano 和 unicorn，但也给出了 apache 的示例。

我按照在线指南设置乘客并修改了 railscasts capistrano 食谱。当我运行cap deploy:setup 时，会在我的服务器上的应用程序根目录中创建一些目录。然后，当我运行cap deploy 时，rails 应用程序被放入发布文件夹和以时间戳命名的目录中。所以这部分似乎工作得很好。

然后有一段时间，当我导航到 http://dev.gregchapple.com/site/index 时，我收到了一些乘客错误，说某些 gem 丢失了，所以我使用 bundler 将它们安装在服务器上，然后错误就消失了。这就是当前问题出现的时候。现在，当我转到 http://dev.gregchapple.com/site/index 时，它只会说：“我们很抱歉，但出了点问题。”

apache 日志包含以下内容：

cache: [GET /site/index] miss
cache: [GET /] miss

有谁知道问题出在哪里？ 我的 apache 配置文件已更改为将文档根设置为乘客文档指定的公共目录。我不知道问题是什么，这让我发疯了！

非常感谢任何帮助:)

更新

这是 production.log 文件：

Started GET "/site/index" for 109.255.221.170 at 2012-08-06 13:26:13 -0700

Mysql2::Error (Access denied for user 'root'@'localhost' (using password: NO)):
mysql2 (0.3.11) lib/mysql2/client.rb:44:in `connect'
mysql2 (0.3.11) lib/mysql2/client.rb:44:in `initialize'
activerecord (3.2.1) lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `new'
activerecord (3.2.1) lib/active_record/connection_adapters/mysql2_adapter.rb:16:in `mysql2_connection'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:277:in `new_connection'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:287:in `checkout_new_connection'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:235:in `block (2 levels) in checkout'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:230:in `loop'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:230:in `block in checkout' /home/greg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:229:in `checkout'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:95:in `connection'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:374:in `retrieve_connection'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_specification.rb:168:in `retrieve_connection'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_specification.rb:142:in `connection'
activerecord (3.2.1) lib/active_record/query_cache.rb:67:in `rescue in call'
activerecord (3.2.1) lib/active_record/query_cache.rb:61:in `call'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:443:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.1) lib/active_support/callbacks.rb:405:in `_run__3520547282522082875__call__1971459733125288916__callbacks'
activesupport (3.2.1) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.1) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.1) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.1) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.1) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.1) lib/rack/lock.rb:15:in `call'
rack-cache (1.2) lib/rack/cache/context.rb:136:in `forward'
rack-cache (1.2) lib/rack/cache/context.rb:245:in `fetch'
rack-cache (1.2) lib/rack/cache/context.rb:185:in `lookup'
rack-cache (1.2) lib/rack/cache/context.rb:66:in `call!'
rack-cache (1.2) lib/rack/cache/context.rb:51:in `call'
railties (3.2.1) lib/rails/engine.rb:479:in `call'
railties (3.2.1) lib/rails/application.rb:220:in `call'
railties (3.2.1) lib/rails/railtie/configurable.rb:30:in `method_missing'
passenger (3.0.15) lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
passenger (3.0.15) lib/phusion_passenger/abstract_request_handler.rb:516:in `accept_and_process_next_request'
passenger (3.0.15) lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
passenger (3.0.15) lib/phusion_passenger/rack/application_spawner.rb:206:in `start_request_handler'
passenger (3.0.15) lib/phusion_passenger/rack/application_spawner.rb:171:in `block in handle_spawn_application'
passenger (3.0.15) lib/phusion_passenger/utils.rb:470:in `safe_fork'
passenger (3.0.15) lib/phusion_passenger/rack/application_spawner.rb:166:in `handle_spawn_application'
passenger (3.0.15) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
passenger (3.0.15) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
passenger (3.0.15) lib/phusion_passenger/abstract_server.rb:180:in `start'
passenger (3.0.15) lib/phusion_passenger/rack/application_spawner.rb:129:in `start'
passenger (3.0.15) lib/phusion_passenger/spawn_manager.rb:253:in `block (2 levels) in spawn_rack_application'
passenger (3.0.15) lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
passenger (3.0.15) lib/phusion_passenger/spawn_manager.rb:246:in `block in spawn_rack_application'
passenger (3.0.15) lib/phusion_passenger/abstract_server_collection.rb:82:in `block in synchronize'
<internal:prelude>:10:in `synchronize'
passenger (3.0.15) lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
passenger (3.0.15) lib/phusion_passenger/spawn_manager.rb:244:in `spawn_rack_application'
passenger (3.0.15) lib/phusion_passenger/spawn_manager.rb:137:in `spawn_application'
passenger (3.0.15) lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
passenger (3.0.15) lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
passenger (3.0.15) lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
passenger (3.0.15) helper-scripts/passenger-spawn-server:99:in `<main>'

更新 2

database.yml

development:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: gregchapple_development
  pool: 5
  host: localhost
  username: root
  password: *****
  socket: /tmp/mysql.sock

test:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: gregchapple_test
  pool: 5
  host: localhost
  username: root
  password: *****
  socket: /tmp/mysql.sock

production:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: gregchapple_production
  pool: 5
  host: localhost
  username: root
  password: *****
  socket: /tmp/mysql.sock

Answer 1

我和你有类似的问题。我在 database.yml 中更改了这些行 添加

主机：127.0.0.1

删除

套接字：/tmp/mysql.sock

然后：

cap deploy:setup
cap deploy:check
cap deploy:cold
#some updates with custom code
cap deploy:update

您必须使用 capistrano 更新代码中的所有内容，不要在 VPN 上更改代码（您只能创建 tmp 目录）。 您在 vpn 上使用 ssh 手动检查您的 sql 连接。例如

mysql -u gregchapple -p

您的虚拟主机还好吗？

Answer 2

您的应用正在寻找 mysql2 适配器，因此请确保您的 Gemfile 中有

gem 'mysql2'

你 bundle install 和你的 database.yml 文件中你正在使用 mysql2 适配器。

production:
  adapter: mysql2
  ...

别忘了从 Rails 应用的根目录重新启动Passenger - touch tmp/restart.txt。

恭喜！你快到了！

Answer 3

您的 Rails 应用程序的 database.yml 的生产部分配置不正确。

1. 在您的服务器上配置 mysql 数据库。
2. 在您的 Rails 应用程序的 database.yml 中配置生产部分，并为生产服务器提供 db 用户名和密码。
3. 再次部署。
4. 测试。