route_table.yaml

---

- name: create public and private route table
  hosts: localhost
  connection: local
  gather_facts: False
  vars:
    vpc_id: "vpc id"
    aws_region: "us-east-1"
    aws_access_key: "access key"
    aws_secret_key: "secret key"
    public_subnet_id: "public subnet id"
    private_subnet_id: "private subnet id"
    igw_id: "igw id"
    nat_gateway_id: "nat gateway id "

  # Route Tables.
  # one RT for the public subnet,
  # and one for the private subnet.
  # the Route Table for the private subnet
  # will redirect default destinations to the NAT Gateway
  # and the Route Table for the public subnet will use the
  # Internet Gateway.
  # 
  # the Route Tables will contain 
  # a route for resources inside the VPC, so that if we need 
  # to reach an internal resource, we don't go to the Internet
  # Gateway or the NAT Gateway.

  - name: Set up public subnet route table
    ec2_vpc_route_table:
      vpc_id: "{{ vpc_id }}"
      region: "{{ aws_region }}"
      aws_access_key: "{{ aws_access_key }}"
      aws_secret_key: "{{ aws_secret_key }}"
      tags:
        Name: "Public"
      subnets:
        - "{{ public_subnet_id }}"
      routes:
        - dest: "0.0.0.0/0"
          gateway_id: "{{ igw_id }}"

  - name: Set up private subnet route table
    ec2_vpc_route_table:
      vpc_id: "{{ vpc_id }}"
      region: "{{ aws_region }}"
      aws_access_key: "{{ aws_access_key }}"
      aws_secret_key: "{{ aws_secret_key }}"
      tags:
        Name: "Private"
      subnets:
        - "{{ private_subnet_id }}"
      routes:
        - dest: "0.0.0.0/0"
          gateway_id: "{{ nat_gateway_id }}"