3

Phusion 乘客错误消息不是我希望我的访问者在我更新后端时看到他们是否登陆我的网站。

那么我该如何解决呢?我的部署过程从一开始就存在缺陷吗?还是我错过了什么?

这是我的部署过程,所以你得到了图片:

  • 将新更新提交到 git repo 并推送到远程
  • 帽部署
  • ssh [ip]
  • 耙宝石:安装
  • 耙分贝:迁移
  • 黄瓜

cap deploy 和 db:migrate 或 gems:install 之间的时间是出现错误消息或在更长的维护期间。

在我写这篇文章时,一个想法突然出现在我脑海中:我可以将这些命令放入我的部署配方中吗?

但是,如果维护需要 30 分钟或一个小时,这些命令将无法解决问题。我如何在这段时间内向访问者提供维护启动页面?

提前致谢。

4

1 回答 1

11

如果应用程序暂时不可用,您应该建立一个维护页面。我使用这个 Capistrano 任务:

namespace :deploy do
  namespace :web do
    desc <<-DESC
      Present a maintenance page to visitors. Disables your application's web \
      interface by writing a "maintenance.html" file to each web server. The \
      servers must be configured to detect the presence of this file, and if \
      it is present, always display it instead of performing the request.

      By default, the maintenance page will just say the site is down for \
      "maintenance", and will be back "shortly", but you can customize the \
      page by specifying the REASON and UNTIL environment variables:

        $ cap deploy:web:disable \\
              REASON="a hardware upgrade" \\
              UNTIL="12pm Central Time"

      Further customization will require that you write your own task.
    DESC
    task :disable, :roles => :web do
      require 'erb'
      on_rollback { run "rm #{shared_path}/system/maintenance.html" }

      reason = ENV['REASON']
      deadline = ENV['UNTIL']      
      template = File.read('app/views/admin/maintenance.html.erb')
      page = ERB.new(template).result(binding)

      put page, "#{shared_path}/system/maintenance.html", :mode => 0644
    end
  end
end

app/views/admin/maintenance.html.erb文件应包含:

<p>We’re currently offline for <%= reason ? reason : 'maintenance' %> as of <%= Time.now.utc.strftime('%H:%M %Z') %>.</p>
<p>Sorry for the inconvenience. We’ll be back <%= deadline ? "by #{deadline}" : 'shortly' %>.</p>

最后一步是使用一些指令配置 Apache 虚拟主机以查找maintenance.html文件并将所有请求重定向到它(如果存在):

<IfModule mod_rewrite.c>
  RewriteEngine On

  # Redirect all requests to the maintenance page if present
  RewriteCond %{REQUEST_URI} !\.(css|gif|jpg|png)$
  RewriteCond %{DOCUMENT_ROOT}/system/maintenance.html -f
  RewriteCond %{SCRIPT_FILENAME} !maintenance.html
  RewriteRule ^.*$ /system/maintenance.html [L]
</IfModule>

要将应用程序置于维护模式,请运行cap deploy:web:disable并使其再次运行cap deploy:web:enable

于 2010-07-29T10:49:45.560 回答