Terraform - 具有混合实例策略的 ASG

Question

我正在使用 AWS 和 Terraform 来启动基础设施，但特别是我在使用混合实例策略启动 ASG 时遇到了问题。我正在尝试启动一个 ASG，其中一个实例始终是按需提供的，其余位置（所有类型都相同），从表面上看，这看起来很容易，但我已经尝试了一段时间并不断遇到各种错误. 这是我目前正在使用的：

 resource "aws_launch_template" "lt" {
   name_prefix            = "danny_test-"
   vpc_security_group_ids = [
     "${module.sec_groups.security_group_id_common}",
     "${module.sec_groups.security_group_id_ssh}",
     "${module.sec_groups.security_group_id_web}"
   ]
   image_id               = "${module.core_ami.core_ami_id}"
   instance_type          = "t2.small"
   key_name               = "${var.ssh_privkey_name}"
   user_data              = "${base64encode(data.template_file.common_user_data.rendered)}"

   iam_instance_profile {
     name = "${module.infradev_remote_state.iam_profile_updater_id}"
   }

   lifecycle {
     create_before_destroy = true
   }
}

resource "aws_autoscaling_group" "asg" {
  name                      = "danny_test"
  vpc_zone_identifier       = ["${split(",", module.environment.private_subnet_ids)}"]
  #launch_configuration      = "${aws_launch_configuration.lc.name}"
  min_size                  = "0"
  max_size                  = "1"
  desired_capacity          = "1"
  health_check_grace_period = "600"
  health_check_type         = "EC2"

  launch_template {
    id = "${aws_launch_template.lt.id}"
  }

  mixed_instances_policy {
    instances_distribution {
      on_demand_base_capacity = "1"
    }
  }
}

但我收到此错误：

Error: aws_autoscaling_group.asg: "mixed_instances_policy.0.launch_template": required field is not set

根据文档，launch_template是可选的。我试过设置它，但它只是陷入了一个所谓的可选设置的兔子洞，其中一些我根本不想设置（如覆盖）。

实现我所追求的正确方法是什么？无论哪种方式，基于上述内容，文档看起来至少部分错误......

Answer 1

该文档似乎是错误的，因为它被设置为Required实际代码中的字段：

        "mixed_instances_policy": {
            Type:     schema.TypeList,
            Optional: true,
            MaxItems: 1,
            Elem: &schema.Resource{
                Schema: map[string]*schema.Schema{
                    # ...
                    "launch_template": {
                        Type:     schema.TypeList,
                        Required: true,
                        MinItems: 1,
                        MaxItems: 1,

资源aws_autoscaling_group文档显示了一个有用的示例，其中包括您提到的可选覆盖：

resource "aws_launch_template" "example" {
  name_prefix   = "example"
  image_id      = "${data.aws_ami.example.id}"
  instance_type = "c5.large"
}

resource "aws_autoscaling_group" "example" {
  availability_zones = ["us-east-1a"]
  desired_capacity   = 1
  max_size           = 1
  min_size           = 1

  mixed_instances_policy {
    launch_template {
      launch_template_specification {
        launch_template_id = "${aws_launch_template.example.id}"
      }

      override {
        instance_type = "c4.large"
      }

      override {
        instance_type = "c3.large"
      }
    }
  }
}

这些覆盖实际上是可选的，如代码所示：

resource "aws_launch_template" "example" {
  name_prefix   = "example"
  image_id      = "${data.aws_ami.example.id}"
  instance_type = "c5.large"
}

resource "aws_autoscaling_group" "example" {
  availability_zones = ["us-east-1a"]
  desired_capacity   = 1
  max_size           = 1
  min_size           = 1

  mixed_instances_policy {
    launch_template {
      launch_template_specification {
        launch_template_id = "${aws_launch_template.example.id}"
      }

      override {
        instance_type = "c4.large"
      }

      override {
        instance_type = "c3.large"
      }
    }
  }
}