通过 Terraform 在目标组中添加 ASG 实例

Question

我有一个 Terraform 脚本，它创建一个启动配置、自动缩放组、一个 ALB、一个目标组和一个侦听器。实例使用自动缩放组启动。

如何在同一脚本中通过 Terraform 将新启动的实例添加到目标组中？

resource "aws_launch_configuration" "CF2TF-LC" {
name                 = "CF2TF-LC"
depends_on           = ["aws_iam_role_policy_attachment.CF2TF-IAM-PA", "aws_security_group.CF2TF-SG-Web"]
image_id             = "ami-14c5486b"
instance_type        = "t2.micro"
iam_instance_profile = "${aws_iam_instance_profile.CF2TF-IAM-IP.id}"
key_name             = "CF2TF"
security_groups      = ["${aws_security_group.CF2TF-SG-Web.id}"]
user_data            = "${template_file.CF2TF-UserData.rendered}"
}
resource "aws_autoscaling_group" "CF2TF-ASG" {
name                      = "CF2TF-ASG"
depends_on                = ["aws_launch_configuration.CF2TF-LC"]
vpc_zone_identifier       = ["${aws_subnet.CF2TF-Subnet-1a.id}", "${aws_subnet.CF2TF-Subnet-1d.id}"]
max_size                  = 3
min_size                  = 2
health_check_grace_period = 300
health_check_type         = "EC2"
desired_capacity          = 2
force_delete              = true
launch_configuration      = "${aws_launch_configuration.CF2TF-LC.id}"
}
resource "aws_lb" "CF2TF-ALB" {
name               = "CF2TF-ALB"
subnets            = ["${aws_subnet.CF2TF-Subnet-1a.id}", "${aws_subnet.CF2TF-Subnet-1d.id}"]
internal           = false
load_balancer_type = "application"
security_groups    = ["${aws_security_group.CF2TF-SG-Web.id}"]
tags {
Name        = "WebSrv"
Environment = "Dev"
}
}
resource "aws_lb_target_group" "CF2TF-TargetGroup" {
name        = "CF2TF-TargetGroup"
depends_on  = ["aws_vpc.CF2TF-VPC"]
port        = 80
protocol    = "HTTP"
vpc_id      = "${aws_vpc.CF2TF-VPC.id}"
target_type = "instance"
health_check {
interval            = 30
path                = "/index.html"
port                = 80
healthy_threshold   = 5
unhealthy_threshold = 2
timeout             = 5
protocol            = "HTTP"
matcher             = "200,202"
}
}
resource "aws_lb_listener" "CF2TF-ALB-Listener" {
//depends_on = ["aws_lb.CF2TF-ALB.id", "aws_lb_target_group.CF2TF-TargetGroup.id"]
load_balancer_arn = "${aws_lb.CF2TF-ALB.arn}"
port              = "80"
protocol          = "HTTP"
default_action {
target_group_arn = "${aws_lb_target_group.CF2TF-TargetGroup.arn}"
type             = "forward"
}
}

Answer 1

aws_autoscaling_group

资源采用一个target_group_arns参数，该参数将向目标组注册 ASG，以便所有实例在启动时向负载均衡器的目标组注册，并在终止之前从负载均衡器中正确排出。

因此，您的 ASG 资源应如下所示：

resource "aws_autoscaling_group" "CF2TF-ASG" {
name                      = "CF2TF-ASG"
depends_on                = ["aws_launch_configuration.CF2TF-LC"]
vpc_zone_identifier       = ["${aws_subnet.CF2TF-Subnet-1a.id}", "${aws_subnet.CF2TF-Subnet-1d.id}"]
max_size                  = 3
min_size                  = 2
health_check_grace_period = 300
health_check_type         = "EC2"
desired_capacity          = 2
force_delete              = true
launch_configuration      = "${aws_launch_configuration.CF2TF-LC.id}"
target_group_arns         = ["${aws_lb_target_group.CF2TF-TargetGroup.arn}"]
}

Answer 2

aws_autoscaling_group资源实现一个参数，target_group_arns完全执行所需的操作。只需将此行添加到自动缩放组资源：

target_group_arns = "${aws_lb_target_group.CF2TF-TargetGroup.arn}"