Terraform模块调用,带有for_each和ARN列表输出



我通过子模块调用根模块,如下所示:

子模块-main.tf

module "create_network_lb" {
source             = "../../modules/lb_test"
for_each           = var.target_groups

name                   = each.key
tg_name                = each.value.tg_name
tg_backend_port        = each.value.tg_backend_port
tg_backend_protocol    = each.value.tg_backend_protocol
tg_hc_port             = each.value.tg_hc_port
tg_hc_protocol         = each.value.tg_hc_protocol
tg_htl_port            = each.value.tg_htl_port
tg_htl_protocol        = each.value.tg_htl_protocol
tg_htl_action          = lookup(each.value, "tg_htl_action", "forward")
subnets                = tolist(data.aws_subnet_ids.private_compute[0].ids)
vpc_id                 = sort(data.aws_vpcs.platform_private_vpc.ids)[0]
}

子模块-vars.tf

variable "target_groups" {
description = "A list of maps containing key/value pairs that define the target groups to be created. Order of these maps is important and the index of these are to be referenced in listener definitions. Required key/values: name, backend_protocol, backend_port"
type        = map
default     = {
lb-1 = {
tg_name = "test1"
tg_backend_protocol = "TCP"
tg_backend_port = "80"
tg_target_type = "instance"
tg_deregistration_delay = "180"
tg_hc_healthy_threshold = 3
tg_hc_interval = 30
tg_hc_port = 80
tg_hc_protocol = "TCP"
tg_hc_unhealthy_threshold = 3
tg_htl_port = "80"
tg_htl_protocol = "TCP"
}
lb-2 = {
tg_name = "test2"
tg_backend_protocol = "TCP"
tg_backend_port = "8080"
tg_target_type = "instance"
tg_deregistration_delay = "180"
tg_hc_healthy_threshold = 3
tg_hc_interval = 30
tg_hc_port = 8080
tg_hc_protocol = "TCP"
tg_hc_unhealthy_threshold = 3
tg_htl_port = "80"
tg_htl_protocol = "TCP"
}
}
}

根模块-main.tf

resource "aws_lb_target_group" "main" {
name                               = var.tg_name
vpc_id                             = var.vpc_id
port                               = var.tg_backend_port
protocol                           = var.tg_backend_protocol
depends_on = [aws_lb.default]
lifecycle {
create_before_destroy = true
}
}
resource "aws_lb_listener" "frontend_http_tcp" {
load_balancer_arn = aws_lb.default.arn
port              = var.tg_htl_port
protocol          = var.tg_htl_protocol

default_action {
type = var.tg_htl_action
target_group_arn = aws_lb_target_group.main.arn
}
}

根模块-输出。tf

output "target_group_arns" {
description = "ARNs of the target groups. Useful for passing to your Auto Scaling group."
value       = aws_lb_target_group.main.arn
}

在子模块中,调用一个附加模块来创建自动缩放组

module "create_autoscaling_group" {
source                    = "../../modules/cloudformation_stack_autoscaling"
template_name             = "launch-template"
cf_stack_name             = "stack"
autoscaling_group_name    = "asg"
instance_type             = var.vm_type
block_device_mappings     = var.block_device_mappings
image_id                  = data.aws_ami.centos_ami.image_id
vpc_security_group_ids    = concat(data.aws_security_groups.security_group_ids.ids, [module.create_security_group.id])
user_data_base64          = data.template_cloudinit_config.config.rendered
iam_instance_profile_name = var.iam_instance_profile_name
volume_tags               = merge(local.vmss_tags,{"fds:cloudformation:stack-name"=local.stack_tag})
ec2_tags                  = var.vmss_tags
subnet_ids                = tolist(data.aws_subnet_ids.private_compute[0].ids)
max_size                  = var.vm_count != 0 ? var.vm_count : var.max_size
min_size                  = var.vm_count != 0 ? var.vm_count : var.min_size
desired_capacity          = var.vm_count != 0 ? var.vm_count : var.desired_capacity
health_check_type         = var.health_check_type
health_check_grace_period = var.health_check_grace_period
target_group_arns         = module.create_network_lb[*].target_group_arns

请注意变量"target_group_ans"。在这里,我需要通过调用"create_network_lb"模块创建的所有目标组的arn,以便所有lb及其关联的目标组都由1自动缩放组管理。

根据我所读到的,当使用for_each时,就像我对"create_network_lb"模块调用所做的那样,我不能使用splat表达式。我试着用列表理解法,但一定是做错了。如有任何帮助,我们将不胜感激。

您的模块create_network_lb将是一个映射,而不是列表。因此,您应该能够将所有target_group_arns引用为:

target_group_arns = values(module.create_network_lb)[*].target_group_arns

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