【Ansible】Ansible で AWS の3層ネットワークを構築する【IaC】

こんにちは。
表題の通り AWS の 3層ネットワークを構築する playbook を用意してみます。
※ 詳細は README を参照ください。
https://github.com/keisukesanuki/aws-vpc-3layer

作るもの

・VPC
・SUBNET
・INTERNETGATEWAY
・NATGATEWAY
・ROUTETABLE

ディレクトリ構造

.
├── README.md
├── ansible.cfg
├── hosts
├── roles
│   └── aws_vpc
│       ├── tasks
│       │   └── main.yml
│       └── vars
│           └── main.yml
└── vpc_create.yml

playbook

---
# tasks file for aws_vpc
- name: create_vpc
  ec2_vpc_net:
    name: "{{ vpc_name }}"
    cidr_block: "{{ vpc_cidr }}"
    region: "{{ region }}"
    profile: "{{ profile }}"
    dns_hostnames: yes
    dns_support: yes
  register: vpc_info

# PUBLIC_SUBNET 作成
- name: create_public_subnet
  ec2_vpc_subnet:
    vpc_id: "{{ vpc_info.vpc.id }}"
    cidr: "{{ item.pub_subnet_cidr }}"
    az: "{{ item.subnet_az }}"
    region: "{{ region }}"
    resource_tags: { "Name":"{{ item.pub_subnet_name }}" }
    profile: "{{ profile }}"
  register: pubsub_info
  with_items:
    - "{{ pub_subnet }}"

# DMZ_SUBNET 作成
- name: create_dmz_subnet
  ec2_vpc_subnet:
    vpc_id: "{{ vpc_info.vpc.id }}"
    cidr: "{{ item.dmz_subnet_cidr }}"
    az: "{{ item.subnet_az }}"
    region: "{{ region }}"
    resource_tags: { "Name":"{{ item.dmz_subnet_name }}" }
    profile: "{{ profile }}"
  register: pubsub_info
  with_items:
    - "{{ dmz_subnet }}"

# PRIVATE_SUBNET 作成
- name: create_private_subnet
  ec2_vpc_subnet:
    vpc_id: "{{ vpc_info.vpc.id }}"
    cidr: "{{ item.pri_subnet_cidr }}"
    az: "{{ item.subnet_az }}"
    region: "{{ region }}"
    resource_tags: { "Name":"{{ item.pri_subnet_name }}" }
    profile: "{{ profile }}"
  register: prisub_info
  with_items:
    - "{{ pri_subnet }}"

# IGW 作成
- name: create_igw
  ec2_vpc_igw:
    vpc_id: "{{ vpc_info.vpc.id }}"
    region: "{{ region }}"
    tags: { "Name":"{{ igw_name }}" }
    profile: "{{ profile }}"
  register: igw_info

# ROUTETABLE 作成(IGW)
- name: create_route_table
  ec2_vpc_route_table:
    vpc_id: "{{ vpc_info.vpc.id }}"
    subnets: "{{ atache_igw_subnet }}"
    routes:
      - dest: 0.0.0.0/0
        gateway_id: "{{ igw_info.gateway_id }}"
    region: "{{ region }}"
    profile: "{{ profile }}"
    resource_tags: { "Name":"{{ rttable_pub_name }}" }

# NGW の ID を取得
- name: get_subnet_id
  shell: aws ec2 describe-subnets --region {{ region }} --profile {{ profile }} --output text | grep -B 1 {{ ngw_subnet_name }} | awk 'NR==1 {print $12}'
  register: ngw_subnet_id

#- name: show
#  debug:
#    msg: "{{ ngw_subnet_id.stdout }}"

# NGW 作成
- name: create_ngw
  ec2_vpc_nat_gateway:
    subnet_id: "{{ ngw_subnet_id.stdout }}"
    region: "{{ region }}"
    profile: "{{ profile }}"
  register: ngw_info

#- name: show
#  debug:
#    msg: "{{ ngw_info.nat_gateway_id }}"

# NGW 作成まで待つ
- name: wait_for_ngw
  pause:
    minutes: 5

# ROUTETABLEの作成(NGW)
- name: create_route_table2
  ec2_vpc_route_table:
    vpc_id: "{{ vpc_info.vpc.id }}"
    subnets: "{{ atache_ngw_subnet }}"
    routes:
      - dest: 0.0.0.0/0
        gateway_id: "{{ ngw_info.nat_gateway_id }}"
    region: "{{ region }}"
    profile: "{{ profile }}"
    resource_tags: { "Name":"{{ rttable_dmz_name }}" }

NATGATEWAY の ID が上手く取得できなかったので awscli の結果をパースして ngw_subnet_id に渡しています。

変数定義

---
# vars file for aws_vpc

# REGION
  region: "ap-northeast-1"

# PROFILE
  profile: "default"

# VPC
  vpc_name: "sanuki-wd-vpc2"
  vpc_cidr: "10.10.0.0/16"

# IGW
  igw_name: "sanuki-igw2"

# NGW
  ngw_name: "sanuki-ngw2"


# NGWを作成するサブネット名
  ngw_subnet_name: "sanuki-wd-public-subnet2-a"

# ROUTETABLE(PUBLIC)
  rttable_pub_name: "sanuki-pub-rt2"

# ROUTETABLE(DMZ)
  rttable_dmz_name: "sanuki-dmz-rt2"

# PUBLIC_SUBNET
  pub_subnet:
    - { pub_subnet_cidr: "10.10.10.0/24" ,subnet_az: "ap-northeast-1a" ,pub_subnet_name: "sanuki-wd-public-subnet2-a" }
    - { pub_subnet_cidr: "10.10.20.0/24" ,subnet_az: "ap-northeast-1c" ,pub_subnet_name: "sanuki-wd-public-subnet2-c" }


# DMZ_SUBNET
  dmz_subnet:
    - { dmz_subnet_cidr: "10.10.30.0/24" ,subnet_az: "ap-northeast-1a" ,dmz_subnet_name: "sanuki-wd-dmz-subnet2-a" }
    - { dmz_subnet_cidr: "10.10.40.0/24" ,subnet_az: "ap-northeast-1c" ,dmz_subnet_name: "sanuki-wd-dmz-subnet2-c" }


# PRIVATE_SUBNET
  pri_subnet:
    - { pri_subnet_cidr: "10.10.50.0/24" ,subnet_az: "ap-northeast-1a" ,pri_subnet_name: "sanuki-wd-private-subnet2-a" }
    - { pri_subnet_cidr: "10.10.60.0/24" ,subnet_az: "ap-northeast-1c" ,pri_subnet_name: "sanuki-wd-private-subnet2-c" }

# IGWに紐付けるサブネット
  atache_igw_subnet:
    - "10.10.10.0/24"
    - "10.10.20.0/24"

# NGWに紐付けるサブネット
  atache_ngw_subnet:
    - "10.10.30.0/24"
    - "10.10.40.0/24"

NatGateway が片方の AZ にしかないため、冗長性の観点からは ? となりますが、まぁいいでしょう。

↓ 2層の playbook はこちら

【Ansible】AnsibleでAWSのネットワークを構築する【IaC】