使用瘦即服务运行 Rails 应用程序答案

【问题标题】：Running Rails apps with thin as a service使用瘦即服务运行 Rails 应用程序
【发布时间】：2010-11-23 22:12:17
【问题描述】：

我正在尝试在我的 Web 服务器上作为服务运行瘦身。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

瘦服务启动后，运行如下

thin start --all /etc/thin

这将扫描所有定义如何为每个定义的应用运行瘦的 yaml 配置文件。这不起作用。

我在日志中看到：

/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，我将我的包缓存在 $APP_PATH/shared/bundle 目录中；所以，这就解释了为什么瘦服务会抱怨没有安装 gem，因为瘦服务不在 $APP_PATH/shared/bundle 中

这确实有效：

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

但这不是 /etc/init.d/thin 中的瘦服务文件的工作方式。我想我可以自己写。我只是不想解决已经解决的问题。

【问题讨论】：

请注意，该错误与未安装的 gem 无关。问题在于不同版本的 activemachine 被激活了两次，建议的解决方法是像你一样运行 bundle exec。
副总裁，是的。看起来thin start --all 并不知道每个应用程序的现有包缓存。
我有一件我不引以为豪的作品。 gist.github.com/712690

标签： ruby-on-rails bundler thin

【解决方案1】：

我想出了这个，但我不觉得它是最好的解决方案，因为它没有利用 Thin 的“--all”选项，它从目录中读取配置文件。相反，我修改了启动/停止/重新启动瘦服务的文件，因此对于每个应用程序，我给它一个特定的启动/停止/重新启动命令。我确信这个命令可以改进，但现在它可以满足我的需要。

#!/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

【讨论】：