使用打包程序从列表中创建 AMI

Question

假设我有一个变量列表。如何使用它们动态创建多个图像？

variable "targets" {
  type = list(string)
  default = [
    "foo",
    "bar",
    "barz"
  ]
}

source "amazon-ebs" "ubuntu" {
    ...
}

build {
  for_each = var.targets
  name     = each.value
  source "amazon-ebs.ubuntu" {
    ami_name = "${each.value}-{{timestamp}}"
  }
  provisioner "ansible" {
    playbook_file = "playbook.yaml"
    extra_arguments = [
      "--extra-vars", "target=${each.value}",
    ]
  }
}

我收到了错误

An argument named "for_each" is not expected here.

Answer 1

没有像 for_each 这样的东西来迭代构建器。

但是，您可以通过以下方式实现所需的功能：

• 定义一个map variable，其中包含一个键/值对，其中包含源名称和相应的值
• 定义多个源，一个用于您希望构建的每个映像
• 利用only construct 运行基于源的配置器

---

完整示例：

variable "targets" {
  default = {
    values: {
      first-example: "foo",
      second-example: "bar"
    }
  }
}

source "null" "first-example" {
  communicator = "none"
}

source "null" "second-example" {
  communicator = "none"
}

build {

  source "null.first-example" {
    name = "example1"
  }
  source "null.second-example" {
    name = "example2"
  }

  sources = [
    "null.first-example",
    "null.second-example"
  ]

  provisioner "shell-local" {
    only = [ "null.first-example" ]
    inline = ["echo ${var.targets.values.first-example}"]
  }
  provisioner "shell-local" {
    only = [ "null.second-example" ]
    inline = ["echo ${var.targets.values.second-example}"]
  }
}

运行packer build .时，上面会输出：

null.first-example:
null.first-example: echo foo
null.first-example: foo
null.second-example:
null.second-example: echo bar
null.second-example: bar