如何立即使用EIP启动实例？

Question

在将eip附加到ec2实例时遇到问题。我只能这样做，就是分配公共ip，然后在构建实例之后附加eip。我想在实例生成之前添加EIP。

resource "aws_instance" "third-WG" {
    provider                    = aws.third
    ami                         = data.aws_ami.ubuntu3.id
    instance_type               = "t2.micro"
    key_name                    = aws_key_pair.third_WGkey.key_name
    associate_public_ip_address = true
    private_ip                  = "10.3.0.10"
    subnet_id                   = aws_subnet.third-WG-Subnet.id
    vpc_security_group_ids      = [aws_security_group.third-SG.id]
    depends_on                  = [aws_instance.WG_DL_SRV]
}

   resource "aws_eip" "third_WG_EIP" {
   provider                  = aws.third
   vpc                       = true
   instance                  = aws_instance.third-WG.id
   depends_on                = [aws_internet_gateway.third-IGW]
   provisioner "local-exec" {
      command = "echo ${aws_eip.third_WG_EIP.public_ip} > ~/Desktop/whole- 
       wash/var/3rd_PUB_IP.txt"
   }
     tags = {
        Name = "third_WG_EIP"
    }
 }

Answer 1

您可以创建一个网络接口，而不是将弹性IP附加到实例，从而使该实例成为弹性IP的依赖关系，迫使首先构建它，并将弹性IP附加到该接口上。然后，您还将使实例使用该接口，因此，所有内容都将一起进行处理。

resource "aws_network_interface" "nic" {
    private_ips          = ["10.3.0.10"]
    subnet_id            = aws_subnet.third-WG-Subnet.id
    #Todo: populate any other needed NIC parameters
} 

resource "aws_eip" "third_WG_EIP" {
   provider                  = aws.third
   vpc                       = true
   network_interface         = aws_network_interface.nic
   depends_on                = [aws_internet_gateway.third-IGW]
   provisioner "local-exec" {
      command = "echo ${aws_eip.third_WG_EIP.public_ip} > ~/Desktop/whole- 
       wash/var/3rd_PUB_IP.txt"
   }
     tags = {
        Name = "third_WG_EIP"
    }
 }

resource "aws_instance" "third-WG" {
    provider                    = aws.third
    ami                         = data.aws_ami.ubuntu3.id
    instance_type               = "t2.micro"
    key_name                    = aws_key_pair.third_WGkey.key_name
    associate_public_ip_address = true

    vpc_security_group_ids      = [aws_security_group.third-SG.id]
    depends_on                  = [aws_instance.WG_DL_SRV]

    network_interface {
        network_interface_id = aws_network_interface.nic.id
        device_index         = 0
    }

}

如果您发现它的顺序仍然有点错误，那么还可以将EIP添加到实例的depends_on参数中，因为EIP不再依赖于实例本身。

注意，我已经很久没有这样做了，您可能会发现需要将其他一些网络类型参数(安全组等)从实例中移到网络接口块中。