使用thin作为服务运行Rails应用程序

Question

我正在尝试在我的Web服务器上将Thin作为服务运行。在运行“sudo thin install”后，Thin在/etc/init.d/thin中创建了以下文件。

#!/bin/sh
DAEMON=/usr/local/lib/ruby/gems/1.9.1/bin/thin
SCRIPT_NAME=/etc/init.d/thin
CONFIG_PATH=/etc/thin

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

case "$1" in
  start)
        $DAEMON start --all $CONFIG_PATH
        ;;
  stop)
        $DAEMON stop --all $CONFIG_PATH
        ;;
  restart)
        $DAEMON restart --all $CONFIG_PATH
        ;;
  *)
        echo "Usage: $SCRIPT_NAME {start|stop|restart}" >&2
        exit 3
        ;;
esac

当thin服务启动时，会运行以下命令：

thin start --all /etc/thin

该命令将扫描所有定义如何运行thin的yaml配置文件。然而，这种方法并不起作用。

我在日志中看到了以下内容：

/usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.0/lib/bundler/runtime.rb:27:in `block in setup': You have already activated eventmachine 0.12.6, but your Gemfile requires eventmachine 0.12.11. Consider using bundle exec. (Gem::LoadError)
  from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.0/lib/bundler/spec_set.rb:12:in `block in each'
  from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.0/lib/bundler/spec_set.rb:12:in `each'
  from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.0/lib/bundler/spec_set.rb:12:in `each'
  from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.0/lib/bundler/runtime.rb:17:in `setup'
  from /usr/local/lib/ruby/gems/1.9.1/gems/bundler-1.0.0/lib/bundler.rb:100:in `setup'
  from /srv/app/current/config/boot.rb:8:in `<top (required)>'
  from <internal:lib/rubygems/custom_require>:29:in `require'
  from <internal:lib/rubygems/custom_require>:29:in `require'
  from /srv/app/current/config/application.rb:1:in `<top (required)>'
  from <internal:lib/rubygems/custom_require>:29:in `require'
  from <internal:lib/rubygems/custom_require>:29:in `require'
  from /srv/app/current/config/environment.rb:2:in `<top (required)>'
  from <internal:lib/rubygems/custom_require>:29:in `require'
  from <internal:lib/rubygems/custom_require>:29:in `require'
  from /srv/app/current/config.ru:3:in `block in <main>'
  from /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.2.1/lib/rack/builder.rb:46:in `instance_eval'
  from /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.2.1/lib/rack/builder.rb:46:in `initialize'
  from /srv/app/current/config.ru:1:in `new'
  from /srv/app/current/config.ru:1:in `<main>'
  from /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.7/lib/rack/adapter/loader.rb:36:in `eval'
  from /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.7/lib/rack/adapter/loader.rb:36:in `load'
  from /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.7/lib/rack/adapter/loader.rb:45:in `for'
  from /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.7/lib/thin/controllers/controller.rb:163:in `load_adapter'
  from /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.7/lib/thin/controllers/controller.rb:67:in `start'
  from /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.7/lib/thin/runner.rb:177:in `run_command'
  from /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.7/lib/thin/runner.rb:143:in `run!'
  from /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.7/bin/thin:6:in `<top (required)>'
  from /usr/local/lib/ruby/gems/1.9.1/bin/thin:19:in `load'
  from /usr/local/lib/ruby/gems/1.9.1/bin/thin:19:in `<main>'

当Capistrano部署时，我将bundle缓存在$APP_PATH/shared/bundle目录中; 所以，这就解释了为什么thin抱怨没有安装gems，因为thin服务不会查找$APP_PATH/shared/bundle。

这样做是可以的:

cd $APP_PATH/current; bundle exec thin start -d -C /etc/thin/app_x.yml

但是这不是位于 /etc/init.d/thin 的薄服务文件的工作方式。我猜我可以自己编写，只是我不想解决已经解决过的问题。

- Sean McCleary

---

请注意，错误不是关于未安装的 gem。问题是 activemachine 被激活了两次以用于不同的版本，并且建议的修复方法是像您正在做的那样运行 bundle exec。 - VP.

VP，是的。似乎thin start --all不知道每个应用程序现有的bundle缓存。 - Sean McCleary

我有一些能够工作但并不引以为豪的东西。https://gist.github.com/712690 - Sean McCleary

Answer 1

我想出了这个方法，但我觉得它不是最好的解决方案，因为它没有利用thin的“--all”选项，该选项从目录中读取配置文件。相反，我修改了启动/停止/重启thin服务的文件，因此对于每个应用程序，我都为其提供了特定的启动/停止/重启命令。我确信这个命令可以改进，但现在它满足了我的需求。

#!/bin/sh

# This is a pretty bad, but effective workaround for starting thin as a service per application.

DAEMON=/usr/local/lib/ruby/gems/1.9.1/bin/thin
# DAEMON=/usr/local/bin/bundler thin
SCRIPT_NAME=/etc/init.d/thin
CONFIG_PATH=/etc/thin

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

case "$1" in
  start)
  cd /srv/hub/current && bundle exec thin start -d -C /etc/thin/hub.yml
  ;;
  stop)
  cd /srv/hub/current && bundle exec thin stop -d -C /etc/thin/hub.yml
  ;;
  restart)
  cd /srv/hub/current && bundle exec thin restart -d -C /etc/thin/hub.yml
  ;;
  *)
  echo "Usage: $SCRIPT_NAME {start|stop|restart}" >&2
  exit 3
  ;;
esac

- Sean McCleary