Question

   cluster_size = 5 
   def build_namenode_box( config )
      vmname = "namenode"
      config.vm.define vmname.to_sym do |namenode|
          namenode.vm.box = "dummy"
          namenode.vm.provision :chef_solo, preserve_order: true do |chef|
             chef.cookbooks_path = "cookbooks"
             chef.roles_path = "roles"
             chef.add_role "test"
             chef.data_bags_path = "data_bags"
             chef.add_recipe "cloudera::namenode"
             chef.add_recipe "cloudera-cluster"
           end
           namenode.vm.provision :hostmanager
           namenode.vm.provision :shell, :inline => $script
      end
    end

    def build_slaves_boxes( config, cluster_size )
      (1..cluster_size).each do |i|
        vmname = "slave#{i}"
        config.vm.define vmname.to_sym do |slave|
          slave.vm.box = "dummy"
          slave.vm.provision :chef_solo, preserve_order: true do |chef|
            chef.cookbooks_path = "cookbooks"
            chef.roles_path = "roles"
            chef.add_role "test"
            chef.data_bags_path = "data_bags"
            chef.add_recipe "cloudera::datanode"
            chef.add_recipe "cloudera-cluster"
          end
          slave.vm.provision :shell, :inline => $slavescript
        end
      end  
    end

    Vagrant.configure("2") do |config|
      config.omnibus.chef_version = :latest
      config.vm.provider :aws do |aws, override|
        config.vm.box = "dummy"
        aws.access_key_id = "myid"
        aws.secret_access_key = "my_key"
        aws.keypair_name = "my_key"
        aws.ami = "ami-7747d01e"
        aws.security_groups = ["my_group"]
        override.ssh.username = "ubuntu"
        override.ssh.private_key_path = "#{current_dir}/my_key.pem"
      end

      config.vm.provider :virtualbox do |v|
          config.vm.box = "precise64"
          config.vm.box_url =  "https://vagrantcloud.com/chef/ubuntu-12.04/version/1/provider/virtualbox.box"
          v.customize ["modifyvm", :id, "--memory", "1024"] 
      end

      #block the program until it returns. 
      build_namenode_box( config )
      # have to wait until the build_namenode_box() returns
      build_slaves_boxes( config, cluster_size )
    end

我正在构建一个Vagrantfile（在Ruby中）来创建一个Cloudera Hadoop集群。它创建的问题如下： Vagrant不执行订单（不要等到订单定义vm完成执行）。所以我需要等到namenode完成，因为从属数据节点在jobtracker之前启动。解决方案？阻止build_namenode_box()函数直到完成。我在Ruby中是非常原始的，那么如何在执行build_namenode_box()函数之前编写一个等待build_slaves_boxes()返回的函数拦截器？我如何使用yield来实现这一目标？

Answer 1

在普通的Vagrant中，这是不可能的，因为您注意到它不支持VM间依赖性。您可以使用以正确顺序调用vagrant up $name的外部脚本或使用chef-metal之类的更复杂的内容来管理配置。

阻止功能直到它完成返回。

1 个答案: