参考文献: Terraform Up & Running (Yevgeniy Brikman著)
mac(Monterey)ではTERRAFORM CRASH発生のため、ubuntu(22)で実施
-- 1. 作業ディレクトリ作成
cd ~
mkdir 20231119
cd 20231119
mkdir -p live/dev/db/mysql
mkdir -p modules/db/mysql
-- 2. モジュール作成
cat <<-'EOF' > ~/20231119/modules/db/mysql/variables.tf
variable "db_name" {
description = "db_name"
type = string
default = null
}
variable "db_username" {
description = "db_username"
type = string
sensitive = true
default = null
}
variable "db_password" {
description = "db_password"
type = string
sensitive = true
default = null
}
variable "backup_retention_period" {
description = "backup_retention_period"
type = number
default = null
}
variable "replicate_source_db" {
description = "replicate_source_db"
type = string
default = null
}
EOF
cat <<-'EOF' > ~/20231119/modules/db/mysql/main.tf
terraform {
required_version = ">= 1.0.0, < 2.0.0"
required_providers {
aws = {
source = "hashicorp/aws"
version = "~> 4.0"
}
}
}
resource "aws_db_instance" "instance01" {
identifier = "instance01"
allocated_storage = 10
instance_class = "db.t2.micro"
skip_final_snapshot = true
backup_retention_period = var.backup_retention_period
replicate_source_db = var.replicate_source_db
engine = var.replicate_source_db == null ? "mysql" : null
db_name = var.replicate_source_db == null ? var.db_name : null
username = var.replicate_source_db == null ? var.db_username : null
password = var.replicate_source_db == null ? var.db_password : null
}
EOF
cat <<-'EOF' > ~/20231119/modules/db/mysql/outputs.tf
output "address" {
value = aws_db_instance.instance01.address
description = "address"
}
output "port" {
value = aws_db_instance.instance01.port
description = "port"
}
output "arn" {
value = aws_db_instance.instance01.arn
description = "arn"
}
EOF
-- 3. メイン処理作成
cat <<-'EOF' > ~/20231119/live/dev/db/mysql/variables.tf
variable "db_username" {
description = "db_username"
type = string
sensitive = true
default = "root"
}
variable "db_password" {
description = "db_password"
type = string
sensitive = true
default = "password"
}
EOF
cat <<-'EOF' > ~/20231119/live/dev/db/mysql/main.tf
terraform {
required_version = ">= 1.0.0, < 2.0.0"
required_providers {
aws = {
source = "hashicorp/aws"
version = "~> 4.0"
}
}
}
provider "aws" {
region = "ap-northeast-1"
alias = "primary"
}
provider "aws" {
region = "ap-southeast-1"
alias = "replica"
}
module "mysql_primary" {
source = "../../../../modules/db/mysql"
providers = {
aws = aws.primary
}
db_name = "db01"
db_username= var.db_username
db_password= var.db_password
backup_retention_period = 1
}
module "mysql_replica" {
source = "../../../../modules/db/mysql"
providers = {
aws = aws.replica
}
replicate_source_db = module.mysql_primary.arn
}
EOF
cat <<-'EOF' > ~/20231119/live/dev/db/mysql/outputs.tf
output "primary_address" {
value = module.mysql_primary.address
description = "primary_address"
}
output "primary_port" {
value = module.mysql_primary.port
description = "primary_port"
}
output "primary_arn" {
value = module.mysql_primary.arn
description = "primary_arn"
}
output "replica_address" {
value = module.mysql_replica.address
description = "replica_address"
}
output "replica_port" {
value = module.mysql_replica.port
description = "replica_port"
}
output "replica_arn" {
value = module.mysql_replica.arn
description = "replica_arn"
}
EOF
-- 4. 実行
cd ~/20231119/live/dev/db/mysql
terraform init
terraform fmt
terraform -version
terraform apply -auto-approve
terraform destroy -auto-approve
