如何平衡 Apache 中的负载杂种应用
我想知道是否有人可以解释如何平衡 Rails 应用程序。
两个问题：
它是否有助于让单独的 Rails 应用程序从同一专用服务器中的同一数据库读取数据？
我了解 Apache 可以平衡负载安装一些额外的模块吗？我说得对吗？我们怎样才能做到这一点？ （请为傻瓜提供解释）
I was wondering if someone can explain how can a rails application be balanced.
Two questions:
Does it even help having separate rails applications reading from the same database in the same dedicated server?
I understand Apache can balance load installing some extra modules? am i right? how can we accomplish this? (please provide explanation for dummies)
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我会考虑使用 Passenger - 它在很大程度上取代了 Mongrel 并处理运行多个 Rails 实例。
Rails 是单线程的，因此在使用 Mongrel 进行部署时，在安装了 mod_proxy 的 Apache 前端的集群中运行多个 Mongrel 实例是“正常”的。这使得 Apache 可以将多个请求分派给可用的应用程序实例。
任何合理的数据库都是为高水平的并发请求而设计的，因此应该能够处理大量的应用程序实例。
根据您的服务器资源，运行多个 Mongrel 实例有很大的好处 - 它实际上是服务并发请求的唯一方法。
即使在小内存主机（例如 512mb）上，如果您的 Rails 应用程序使用 100mb 内存，您也可以轻松运行多个实例，而不会耗尽资源 - 然后您可以处理与实例一样多的并发请求。
Sliecehost 有一些很棒的文章，例如： http:// /articles.slicehost.com/2009/4/17/centos-apache-rails-and-mongrels
I would have a look at using Passenger - it has largely superseded Mongrel and handles running multiple Rails instances.
Rails is single threaded, so when deploying with Mongrel it is "normal" to run several Mongrel instances in a cluster fronted by Apache with mod_proxy installed. This lets Apache dispatch multiple requests to free application instances.
Any reasonable databases is designed for high levels of concurrent requests so should be able to handle a far number of application instances.
Depending on your server resources there is great benefit in running multiple Mongrel instances - it is actually the only way to serve concurrent requests.
Even on a small-memory host (say 512mb), if your Rails app uses 100mb of memory you would be easily able to run several instances without running out of resources - you could then serve as many concurrent requests as you have instances.
Sliecehost has some awesome articles like this one: http://articles.slicehost.com/2009/4/17/centos-apache-rails-and-mongrels