Heroku，Grails：如果使用多个Web dynos，缺少资源 [英] Heroku, Grails: Missing resources if using multiple web dynos

问题描述

我创建了grails应用程序，并将它上传到了heroku中。

如果我使用了'heroku scale web = 1'，那么一切看起来都不错。但是如果我运行'heroku scale web = 2'，一些静态资源就会消失。

从日志中我可以看出，来自web.2 dyno的所有静态资源都缺失。但是这个dyno是在没有任何错误的情况下启动的。

我该如何解决这个问题？

解决方案

https://github.com/grails-plugins/grails根据资源插件的所有者Marc Palmer的说法，他们忽略了对静态资源的旧引用的检查。因此，如果您没有使用粘性负载平衡（Heroku就是这种情况），那么这将表现为您在任何系统上都会遇到的负载平衡问题。以下是Heroku案例中发生的情况：

1. 请求进入someapp.com


2. index.gsp从app server 1，web.1提供。
   index.gsp包含
   
3. 资源插件生成从/static/js/resource.js到/ js / resource的映射。 js on web.1


4. 客户端请求/static/js/resource.js


5. 请求被路由到不同的应用服务器，web.2


6. /static/js/resource.js尚未映射到web.2和404s上

从我的研究中，最好的做法是在资源文件中声明您的资源。

请参阅以下内容：

http：// grails -plugins.github.com/grails-resources/guide/3.%20Declaring%20resources.html

这会在启动时告诉应用服务器资源存在前面，avoi例如，正如在我以前的电子邮件中，MyResources.groovy看起来像：

  modules = {
 application {
 resource url：'js / application.js'
 resource url：'js / ui.geo_autocomplete.js '
} 
} 
  

所以，你可以使用两种方法 - 显式指定资源，或使用adhoc加载（将以下内容添加到您的Config.groovy中：）

pre $ grails.resources.adhoc .includes = []
grails.resources.adhoc.excludes = [*]

它基本上禁用了特别的资源处理。

I have created grails application and uploaded it in heroku.
If I use 'heroku scale web=1' everything looks OK. But if I run 'heroku scale web=2', some static resources disappear.
From logs I can figure out, that all static resources from web.2 dyno are missing. But this dyno is started without any errors.

How can I resolve this problem?

解决方案

https://github.com/grails-plugins/grails-resources/pull/11

According to the owner of the resources plugin, Marc Palmer, they're ignoring a check for old references to static resources.

So, this manifests itself as a load balancing issue that you would have on any system if you're not using sticky load balancing (which is the case with Heroku). Here's what's happening in the Heroku case:

1. Request comes into someapp.com
2. index.gsp is served from app server 1, web.1 index.gsp contains
3. The resources plugin generates a mapping from /static/js/resource.js to /js/resource.js on web.1
4. The client makes a request for /static/js/resource.js
5. The request is routed to a different app server, web.2
6. /static/js/resource.js has not been mapped on web.2 and 404s

From my research, the best practice is to declare your resources in a resources file.

See the following:

http://grails-plugins.github.com/grails-resources/guide/3.%20Declaring%20resources.html

This will tell the app server at boot time that a resource exists up front, avoiding the adhoc loading process.

For example, as in my previous email, a MyResources.groovy would look like:

modules = { 
  application { 
    resource url:'js/application.js' 
    resource url:'js/ui.geo_autocomplete.js' 
  } 
}

So, you can use either of the two methods -- explicitly specify resources, or use adhoc loading (add the following to your Config.groovy: )

grails.resources.adhoc.includes = [] 
grails.resources.adhoc.excludes = ["*"]

It essentially disables adhoc resource processing.

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