Question

我有一个流浪文件，我想要一个变量＆＃34;服务器＆＃34;待用......

# -*- mode: ruby -*-
# vi: set ft=ruby :

NUMM = 3
IP_OFFSET = 10
setup_master = File.read("master.sh")
setup_slave = File.read("slave.sh")

def ip_from_num(i)
"172.31.16.#{100+i+IP_OFFSET}"
end

# Map of servers -> parameters. 
servers = {
0 => ["mybox","master.rhbd","ami-759dcb74","ap-northeast-1","subnet-4aa28b22","MASTER",ip_from_num(0)],
1 => ["mybox","slave1.rhbd","ami-759dcb74","ap-northeast-1","subnet-4aa28b22","SLAVE",ip_from_num(1)],
}

def getBox()
   ## this variable isnt available to vagrant...
   servers[0]
end


Vagrant.configure("2") do |config|
  (0..NUMM).each do |i|
    config.vm.define "aws#{i}" do |n|
          n.vm.box = getBox() 
          ...

但是，当调用此Vagrantfile时，vagrant会抱怨＆＃34;服务器＆＃34;变量不存在。这是有道理的：如果vagrant从另一个类调用，并从该位置读取配置，则可能无法在该范围内访问Vagrantfile中定义的类变量。

所以我的问题是：如何在我的Vagrantfile中创建外部供应商可访问的变量？它似乎与函数调用一样正常（或者因为它们在创建期间实现，或者因为vagrant可以很容易地调用函数，因为默认的作用域）。

Answer 1

另一种选择是将变量转换为函数-不好，但是如果对这种情况足够好的话：

# Map of servers -> parameters. 
def servers()
    {
        0 => ["mybox","master.rhbd","ami-759dcb74","ap-northeast-1","subnet-4aa28b22","MASTER",ip_from_num(0)],
        1 => ["mybox","slave1.rhbd","ami-759dcb74","ap-northeast-1","subnet-4aa28b22","SLAVE",ip_from_num(1)],
    }
end

def getBox()
   ## this variable isnt available to vagrant...
   servers()[0]
end

（假设在其他地方也需要servers，否则它可能只是getBox中的局部变量。）

我们应该如何在Vagrantfile中外化变量？

1 个答案: