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很遗憾 terraform 不向后兼容。

 data "aws_security_group" "security_groupdev" {
        filter {
        name   = "group-name"
        values = ["SecurityGroupdev"]
      }
    }

    resource "aws_instance" "ec2_instance" {
      count                = "${var.ec2_instance_count}"
    ...
    }


    resource "aws_network_interface_sg_attachment" "sg_attachment" {
      security_group_id    = "${data.aws_security_group.security_groupdev.id}"
      network_interface_id = "${aws_instance.ec2_instance.primary_network_interface_id}"
    }

但是在将其升级到 Terraform 0.12 后,我开始遇到问题,并且无法获得 TF0.12 的语法。

错误:缺少资源实例键

  on ..\resources\ec2_instance\main.tf line 101, in resource "aws_network_interface_sg_attachment" "sg_attachment":
 101:   network_interface_id = "${aws_instance.ec2_instance.primary_network_interface_id}"

由于 aws_instance.ec2_instance 设置了“计数”,因此必须在特定实例上访问其属性。

我试过“${aws_instance.ec2_instance[count.index].primary_network_interface_id}”但没有运气。

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