TERRAFORM 进阶_语言 & 开发_亚马逊云科技 (Amazon Web Services）

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第 3 章 Terraform 进阶

Terraform 的功能非常丰富，可以通过 Providers 来提供对多平台的支持，通过 Provisioners 来实现本地与远程的脚本调用等功能，支持 ssh 与 winrm 的连接方式，也能作为 Chef Client 的方式运行，通过 Modules 去重用组件提高开发效率，大数 AWS 资源都能通过官方托管的 Module Sources 来重用。

本章节我们将利用更多的 Terraform 功能，来实现较复杂场景的部署。

3.1 部署架构

以上架构要采用常见的三层应用方式，Web 层位于公网，App 与 DB 层位于私有网段，Web 层安全组开放 80 及 22 端口，App 层安全组对 Web 层开放，DB 层安全组对 App 层开放。

3.2 配置文件

新建一个 helloworld2 目录，将下面的四个文件存放到同一目录，文件的易读比较好，这里不对内容做详细解释，有关详细使用方法可以参考如下：

https://www.terraform.io/docs/index.html

https://registry.terraform.io/browse?provider=aws

3.2.1 variable.tf

变量申明, 编辑名为 variable.tf 的文件，内容如下

variable "aws_access_key" {}
variable "aws_secret_key" {}
variable "aws_key_pair" {}
variable "aws_region" {}
variable "inst_ami" {}
variable "inst_type" {}

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3.2.2 terraform.tfvars

编辑名为 terraform.tfvars 的文件，内容如下

aws_access_key =  "Access Key"
aws_secret_key = "Secret_Key"
aws_key_pair =  "Your Key Pair"
aws_region = "cn-north-1"
inst_ami = "ami-fba67596"
inst_type = "t2.micro"

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3.2.3 aws.tf

编辑名为 aws.tf 的文件，内容如下

provider "aws" {
access_key = "${var.aws_access_key}"
secret_key = "${var.aws_secret_key}"
region     = "${var.aws_region}"
}

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3.2.4 main.tf

编辑名为 main.tf 的文件，内容如下

module "vpc" {
source = "terraform-aws-modules/vpc/aws"

name = "myvpc"
cidr = "10.10.0.0/16"

azs              = ["cn-north-1a", "cn-north-1b"]
public_subnets   = ["10.10.0.0/24", "10.10.10.0/24"]
private_subnets  = ["10.10.1.0/24", "10.10.11.0/24"]
database_subnets = ["10.10.2.0/24", "10.10.12.0/24"]

create_database_subnet_group = true
enable_dns_hostnames         = true
enable_dns_support           = true
enable_dynamodb_endpoint     = true
enable_s3_endpoint           = true

tags = {
Owner       = "user"
Environment = "staging"
}
}

module "websg" {
source = "terraform-aws-modules/security-group/aws"

name        = "web-service"
description = "Security group for HTTP and SSH within VPC"
vpc_id      = "${module.vpc.vpc_id}"

ingress_rules            = ["http-80-tcp", "https-443-tcp", "ssh-tcp", "all-icmp"]
ingress_cidr_blocks      = ["0.0.0.0/0"]
ingress_ipv6_cidr_blocks = []
egress_rules             = ["all-all"]
egress_cidr_blocks       = ["0.0.0.0/0"]
egress_ipv6_cidr_blocks  = []
}

module "appsg" {
source = "terraform-aws-modules/security-group/aws"

name        = "app-service"
description = "Security group for App within VPC"
vpc_id      = "${module.vpc.vpc_id}"

ingress_ipv6_cidr_blocks = []
egress_ipv6_cidr_blocks  = []

ingress_with_source_security_group_id = [
{
rule                     = "all-all"
source_security_group_id = "${module.websg.this_security_group_id}"
},
]

egress_with_source_security_group_id = [
{
rule                     = "all-all"
source_security_group_id = "${module.websg.this_security_group_id}"
},
]
}

module "dbssg" {
source = "terraform-aws-modules/security-group/aws"

name        = "dbs-service"
description = "Security group for Database within VPC"
vpc_id      = "${module.vpc.vpc_id}"

ingress_ipv6_cidr_blocks = []
egress_ipv6_cidr_blocks  = []

ingress_with_source_security_group_id = [
{
rule                     = "all-all"
source_security_group_id = "${module.appsg.this_security_group_id}"
},
]

egress_with_source_security_group_id = [
{
rule                     = "all-all"
source_security_group_id = "${module.appsg.this_security_group_id}"
},
]
}

module "ec2_web_1a" {
source = "terraform-aws-modules/ec2-instance/aws"

name  = "web_1a"
instance_count = 1

ami                         = "${var.inst_ami}"
instance_type               = "${var.inst_type}"
key_name                    = "${var.aws_key_pair}"
monitoring                  = true
vpc_security_group_ids      = ["${module.websg.this_security_group_id}"]
subnet_id                   = "${module.vpc.public_subnets[0]}"
associate_public_ip_address = true

tags = {
Terraform   = "true"
Environment = "dev"
}
}

module "ec2_web_1b" {
source = "terraform-aws-modules/ec2-instance/aws"

name  = "web_1b"
instance_count = 1

ami                         = "${var.inst_ami}"
instance_type               = "${var.inst_type}"
key_name                    = "${var.aws_key_pair}"
monitoring                  = true
vpc_security_group_ids      = ["${module.websg.this_security_group_id}"]
subnet_id                   = "${module.vpc.public_subnets[1]}"
associate_public_ip_address = true

tags = {
Terraform   = "true"
Environment = "dev"
}
}

module "ec2_app_1a" {
source = "terraform-aws-modules/ec2-instance/aws"

name  = "app_1a"
instance_count = 2

ami                         = "${var.inst_ami}"
instance_type               = "${var.inst_type}"
key_name                    = "${var.aws_key_pair}"
monitoring                  = true
vpc_security_group_ids      = ["${module.appsg.this_security_group_id}"]
subnet_id                   = "${module.vpc.private_subnets[0]}"
associate_public_ip_address = false

tags = {
Terraform   = "true"
Environment = "dev"
}
}

module "ec2_app_1b" {
source = "terraform-aws-modules/ec2-instance/aws"

name  = "app_1b"
instance_count = 2

ami                         = "${var.inst_ami}"
instance_type               = "${var.inst_type}"
key_name                    = "${var.aws_key_pair}"
monitoring                  = true
vpc_security_group_ids      = ["${module.appsg.this_security_group_id}"]
subnet_id                   = "${module.vpc.private_subnets[1]}"
associate_public_ip_address = false

tags = {
Terraform   = "true"
Environment = "dev"
}
}

module "mysql01" {
source = "terraform-aws-modules/rds/aws"

identifier             = "mysql01"
engine                 = "mysql"
engine_version         = "5.7.11"
instance_class         = "db.t2.small"
allocated_storage      = 20
storage_type           = "gp2"
name                   = "demodb"
username               = "myadmin"
password               = "rootroot"
port                   = "3306"
multi_az               = true
vpc_security_group_ids = ["${module.dbssg.this_security_group_id}"]
maintenance_window     = "Mon:00:00-Mon:03:00"
backup_window          = "03:00-06:00"

tags = {
Owner       = "user"
Environment = "dev"
}

subnet_ids                = ["${module.vpc.database_subnets}"]
family                    = "mysql5.7"
final_snapshot_identifier = false
backup_retention_period   = 0
publicly_accessible       = false

parameters = [
{
name  = "character_set_client"
value = "utf8"
},
{
name  = "character_set_server"
value = "utf8"
},
]
}