terraform - 在 Terraform 中将两个列表组合成一个格式化字符串

Question

我需要创建一个字符串参数以通过 local-exec 传递给 aws-cli，因此需要将远程状态的两个列表组合成所需的格式，想不出使用内置插值函数的好方法。

必需的字符串格式

"SubnetId=subnet-x,Ip=ip_x SubnetId=subnet--y,Ip=ip_y SubnetId=subnet-z,Ip=ip_z"

我们在两个单独的列表中有子网和相应的 cidr。

["subnet-x","subnet-y","subnet-z"]
["cidr-x","cidr-y","cidr-z"]

正在考虑我可以使用 cidrhost 函数来获取 IP，但看不到将两个列表格式化为一个字符串的方法。

标签： terraform

Answer 1

尝试使用formatlist后跟join。

locals {
   # this should give you 
   formatted_list = "${formatlist("SubnetId=%s,Ip=%s", var.subnet_list, var.cidrs_list}"

   # combine the formatted list of parameter together using join
   cli_parameter = "${join(" ", locals.formatted_list)}"
}

编辑：您将需要使用 anull_resource将 CIDR 转换为 IP 地址，就像在另一个答案中一样。然后你可以像以前一样构建formatted_list和cli_parameter。

locals {
   subnet_list = ["subnet-x","subnet-y","subnet-z"]
   cidr_list = ["cidr-x","cidr-y","cidr-z"]

   # this should give you 
   formatted_list = "${formatlist("SubnetId=%s,Ip=%s", var.subnet_list, null_resource.cidr_host_convert.*.triggers.value)}"

   # combine the formatted list of parameter together using join
   cli_parameter = "${join(" ", locals.formatted_list)}"
}

resource "null_resource" "cidr_host_convert" {
   count = "${length(locals.cidr_list}"

   trigger = {
      # for each CIDR, get the first IP Address in it. You may need to manage
      # the index value to prevent overlap
      desired_ips = "${cidrhost(locals.cidr_list[count.index], 1)}"
   }
}