Урок 8-10: Переменные и внешние файлы

variable "aws_region" {
  description = "AWS region where resources will be created"
  type        = string
  default     = "us-west-2"
}

variable "instance_type" {
  description = "EC2 instance type"
  type        = string
  default     = "t2.micro"
}

variable "environment" {
  description = "Environment name"
  type        = string
  validation {
    condition     = contains(["dev", "staging", "prod"], var.environment)
    error_message = "Environment must be dev, staging, or prod."
  }
}

variable "tags" {
  description = "Common tags for all resources"
  type        = map(string)
  default = {
    Project = "MyApp"
    Owner   = "DevOps"
  }
}

variable "cidr_blocks" {
  description = "CIDR blocks for security group"
  type        = list(string)
  default     = ["0.0.0.0/0"]
}

provider "aws" {
  region = var.aws_region
}

resource "aws_instance" "web" {
  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = var.instance_type

  tags = merge(
    var.tags,
    {
      Name        = "web-server"
      Environment = var.environment
    }
  )
}

resource "aws_security_group" "web" {
  name = "web-sg"

  ingress {
    from_port   = 80
    to_port     = 80
    protocol    = "tcp"
    cidr_blocks = var.cidr_blocks
  }
}

aws_region = "us-west-2"
instance_type = "t2.micro"
environment = "production"

tags = {
  Project   = "WebApp"
  Owner     = "DevOps"
  CostCenter = "Engineering"
}

cidr_blocks = ["0.0.0.0/0"]

aws_region    = "us-west-2"
instance_type = "t2.micro"
environment   = "dev"
cidr_blocks   = ["10.0.0.0/8"]

aws_region    = "us-east-1"
instance_type = "t2.large"
environment   = "prod"
cidr_blocks   = ["10.0.0.0/8", "172.16.0.0/12"]

# Для разработки
terraform apply -var-file="dev.tfvars"

# Для production
terraform apply -var-file="prod.tfvars"

# Переопределить конкретную переменную
terraform apply -var-file="prod.tfvars" -var="instance_type=t2.xlarge"

locals {
  common_tags = {
    Project     = "MyApp"
    Owner       = "DevOps"
    ManagedBy   = "Terraform"
    CreatedAt   = timestamp()
  }

  instance_name = "${var.environment}-web-server"

  # Условные переменные
  instance_type = var.environment == "prod" ? "t2.large" : "t2.micro"

  # Вычисленные значения
  region_prefix = substr(var.aws_region, 0, 2)
}

resource "aws_instance" "web" {
  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = local.instance_type

  tags = merge(
    local.common_tags,
    {
      Name = local.instance_name
    }
  )
}

#!/bin/bash
set -e

echo "Updating system packages..."
apt-get update
apt-get install -y curl wget

echo "Installing nginx..."
apt-get install -y nginx

echo "Starting nginx..."
systemctl start nginx
systemctl enable nginx

echo "Setup completed!"

resource "aws_instance" "web" {
  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = "t2.micro"

  user_data = file("${path.module}/user-data.sh")

  tags = {
    Name = "web-server"
  }
}

#!/bin/bash
set -e

echo "Environment: ${environment}"
echo "Region: ${region}"
echo "Installing packages: ${packages}"

apt-get update
apt-get install -y ${packages}

echo "Setup completed for ${environment}!"

locals {
  user_data_vars = {
    environment = var.environment
    region      = var.aws_region
    packages    = "nginx curl wget"
  }
}

resource "aws_instance" "web" {
  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = "t2.micro"

  user_data = templatefile("${path.module}/user-data.tpl", local.user_data_vars)

  tags = {
    Name = "web-server"
  }
}

locals {
  config = {
    version = "1.0"
    app = {
      name    = "myapp"
      port    = 8080
      debug   = var.environment != "prod"
    }
    database = {
      host     = "db.example.com"
      port     = 5432
      username = var.db_user
    }
  }
}

resource "aws_secretsmanager_secret_version" "config" {
  secret_id      = aws_secretsmanager_secret.app_config.id
  secret_string  = jsonencode(local.config)
}

# Экспортировать переменные
export TF_VAR_aws_region="eu-west-1"
export TF_VAR_environment="production"
export TF_VAR_instance_type="t2.large"

# Terraform автоматически прочитает эти переменные
terraform plan

terraform-web-server/
├── provider.tf
├── variables.tf
├── locals.tf
├── main.tf
├── outputs.tf
├── terraform.tfvars
├── dev.tfvars
├── prod.tfvars
├── user-data.sh
└── user-data.tpl

variable "aws_region" {
  type    = string
  default = "us-west-2"
}

variable "environment" {
  type = string
  validation {
    condition     = contains(["dev", "prod"], var.environment)
    error_message = "Environment must be dev or prod."
  }
}

variable "instance_count" {
  type    = number
  default = 1
}

locals {
  instance_type = var.environment == "prod" ? "t2.large" : "t2.micro"
  common_tags = {
    Environment = var.environment
    ManagedBy   = "Terraform"
  }
}

resource "aws_instance" "web" {
  count         = var.instance_count
  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = local.instance_type

  user_data = templatefile("${path.module}/user-data.tpl", {
    environment = var.environment
    region      = var.aws_region
    packages    = "nginx"
  })

  tags = merge(
    local.common_tags,
    {
      Name = "${var.environment}-web-${count.index + 1}"
    }
  )
}

# Для разработки
terraform apply -var-file="dev.tfvars"

# Для production
terraform apply -var-file="prod.tfvars" -var="instance_count=3"

# С переменными окружения
export TF_VAR_environment="prod"
terraform plan