Ruby on rails 如何为特定角色创建角色并运行capistrano任务？

这是我在config/deploy中的production.rb

Instance Details
server '198.61.179.237', :web, :app, :db, primary: true
server '198.61.228.160', :file_server

# Rails Environment
set :rails_env, 'production'

从deploy.rb

namespace :check do
  task :function_1, :roles => :web do
    puts 'function_1'
  end
  task :function_2, :roles => :file_server do
    puts 'filesssss'
  end
end

但是当我试着做

cap HOSTS=198.61.228.160 production check:function_2
cap HOSTS=198.61.228.160 production check:function_1

cap HOSTS=198.61.179.237 production check:function_2
cap HOSTS=198.61.179.237 production check:function_1

他们每个人都给出了各自的输出。但是根据声明

函数_1

应仅适用于

：角色=>：web

，同样地

函数_2

应仅适用于

：角色=>：文件服务器

我错在哪里？

---

正确的方法是什么？

我相信您想要的是

cap HOSTFILTER=198.61.228.160函数_2

或

cap HOSTFILTER=198.61.179.237函数_1

这是因为HOSTFILTER检查所有具有函数角色的服务器与您要查找的服务器的交集。一个很好的解释可以通过

由于手册的原因，我们也可以看到这一点：

    $ cap -H

       HOSTS
            Execute the tasks against this comma-separated list of hosts.
            Effectively, this makes the host(s) part of every roles.

       HOSTFILTER
            Execute tasks against this comma-separated list of host, 
            but only if the host has the proper role for the task.

       HOSTROLEFILTER
            Execute tasks against the hosts in this comma-separated list of roles,
            but only if the host has the proper role for the task.

       ROLES
            Execute tasks against this comma-separated list of roles.  Hosts which
            do not have the right roles will be skipped.