使用Terraform创建多个极光集群

Question

是否有Terraform方法可以创建多个Aurora DB集群？我试图使cluster_name成为一个列表，但看起来像"；cluster_identifier"；resource需要一个String，而不是一个字符串列表。我可以为一个集群创建多个实例，但我看不到在Terraform中创建多个DB集群的方法。

# The Aurora cluster (which contains database instances created below).
resource "aws_rds_cluster" "aurora_cluster" {
engine                          = var.rds_engine
engine_version                  = var.rds_engine_version
cluster_identifier              = var.rds_cluster_name
master_username                 = local.aurora_creds.username
master_password                 = local.aurora_creds.password
db_subnet_group_name            = var.subnet_group_name
iam_roles                       = var.rds_iam_roles
vpc_security_group_ids          = var.security_groups
lifecycle {
create_before_destroy = true
}

}

resource "aws_rds_cluster_instance" "aurora_instance" {
engine                  = var.rds_engine
engine_version          = var.rds_engine_version
count                   = var.instance_count
identifier              = "${var.rds_cluster_name}-${count.index}"
cluster_identifier      = var.rds_cluster_name
instance_class          = var.rds_instance_class
db_subnet_group_name    = var.subnet_group_name
availability_zone       = lookup(element(var.subnet_zones, count.index), "zone")
publicly_accessible     = false
lifecycle {
create_before_destroy = true
}

}

Answer 1

有几种方法可以在Terraform中提供x数量的资源。

您可以在资源本身中使用count属性。

locals {
instance_count = 2
}
resource "aws_rds_cluster_instance" "aurora_instance" {
count                   = local.instance_count
engine                  = var.rds_engine
engine_version          = var.rds_engine_version
identifier              = "${var.rds_cluster_name}-${count.index}"
cluster_identifier      = var.rds_cluster_name
instance_class          = var.rds_instance_class
db_subnet_group_name    = var.subnet_group_name
availability_zone       = lookup(element(var.subnet_zones, count.index), "zone")
publicly_accessible     = false
lifecycle {
create_before_destroy = true
}
}

或者可以使用for_each属性。

locals {
zones = ["us-west-2a", "us-west-2b"]
}
resource "aws_rds_cluster_instance" "aurora_instance" {
for_each                = toset(local.zones)
engine                  = var.rds_engine
engine_version          = var.rds_engine_version
identifier              = "${var.rds_cluster_name}-${each.key}"
cluster_identifier      = var.rds_cluster_name
instance_class          = var.rds_instance_class
db_subnet_group_name    = var.subnet_group_name
availability_zone       = each.key
publicly_accessible     = false
lifecycle {
create_before_destroy = true
}
}

Answer 2

我建议您为此使用一个模块，然后使用1efty的方法进行foreach计数，该模块将在内部为您创建实例：https://registry.terraform.io/modules/terraform-aws-modules/rds-aurora/aws

例如：

module "cluster" {
source  = "terraform-aws-modules/rds-aurora/aws"
for_each = {
cluster_one = "a"
cluster_two = "b"
} 
name           = "test-aurora-db-postgres96"
engine         = "aurora-postgresql"
engine_version = "14.5"
instance_class = "db.r6g.large"
instances = {
one = {}
2 = {
instance_class = "db.r6g.2xlarge"
}
}
vpc_id               = "vpc-12345678"
db_subnet_group_name = "db-subnet-group"
security_group_rules = {
ex1_ingress = {
cidr_blocks = ["10.20.0.0/20"]
}
ex1_ingress = {
source_security_group_id = "sg-12345678"
}
}
storage_encrypted   = true
apply_immediately   = true
monitoring_interval = 10
enabled_cloudwatch_logs_exports = ["postgresql"]
tags = {
Environment = "dev"
Terraform   = "true"
}
}