Deploy Subnets into different availability zones using Ansible in AWS - amazon-web-services

Question

I am Working on putting subnets into different availability zones in AWS with the help of ansible. I want to put subnet1 into us-east-1a, then subnet2 into us-east-1b and so on. Currently I can only be able to put servers onto us-east-1a only. Here is the ansible scripts.
---
- name: Create AWS VPC and Subnets
hosts: localhost
connection: local
gather_facts: false
vars:
region: us-east-1
prefix: mahela_ansible
az1: us-east-1a
az2: us-east-1b
az3: us-east-1c
tasks:
- name: Create VPC
local_action:
module: ec2_vpc
region: "{{ region }}"
cidr_block: 10.123.0.0/16
resource_tags: '{"Name":"{{ prefix }}"}'
subnets:
- name: Cassandra Subnet
cidr: 10.123.0.0/24
az: "{{ az1 }}"
resource_tags: '{"Name":"{{ prefix }}_cassandra"}'
- name: MongoDB Subnet
cidr: 10.123.1.0/24
az: "{{ az2 }}"
resource_tags: '{"Name":"{{ prefix }}_Mongodb"}'
- name: Elastic Search
cidr: 10.123.2.0/24
az: "{{ az3 }}"
resource_tags: '{"Name":"{{ prefix }}_elasticsearch"}'

Answer 1

That example might help you.
roles/vpc/defaults/main.yml file look like this:
---
# Variables that can provide as extra vars
VPC_NAME: test
VPC_REGION: us-east-1 # N.Virginia
VPC_CIDR: "172.25.0.0/16"
VPC_CLASS_DEFAULT: "172.25"
# Variables for VPC
vpc_name: "{{ VPC_NAME }}"
vpc_region: "{{ VPC_REGION }}"
vpc_cidr_block: "{{ VPC_CIDR }}"
public_cidr_1: "{{ VPC_CLASS_DEFAULT }}.10.0/24"
public_az_1: "{{ vpc_region }}a"
public_cidr_2: "{{ VPC_CLASS_DEFAULT }}.20.0/24"
public_az_2: "{{ vpc_region }}b"
private_cidr_1: "{{ VPC_CLASS_DEFAULT }}.30.0/24"
private_az_1: "{{ vpc_region }}a"
private_cidr_2: "{{ VPC_CLASS_DEFAULT }}.40.0/24"
private_az_2: "{{ vpc_region }}b"
# Please don't change the variables below, until you know what you are doing
#
# Subnets Defination for VPC
vpc_subnets:
- cidr: "{{ public_cidr_1 }}" # Public Subnet-1
az: "{{ public_az_1 }}"
resource_tags: { "Name":"{{ vpc_name }}-{{ public_az_1 }}-public_subnet-1", "Type":"Public", "Alias":"Public_Subnet_1" }
- cidr: "{{ public_cidr_2 }}" # Public Subnet-2
az: "{{ public_az_2 }}"
resource_tags: { "Name":"{{ vpc_name }}-{{ public_az_2 }}-public-subnet-2", "Type":"Public", "Alias":"Public_Subnet_2" }
- cidr: "{{ private_cidr_1 }}" # Private Subnet-1
az: "{{ private_az_1 }}"
resource_tags: { "Name":"{{ vpc_name }}-{{ private_az_1 }}-private-subnet-1", "Type":"Private", "Alias":"Private_Subnet_1" }
- cidr: "{{ private_cidr_2 }}" # Private Subnet-2
az: "{{ private_az_2 }}"
resource_tags: { "Name":"{{ vpc_name }}-{{ private_az_2 }}-private-subnet-2", "Type":"Private", "Alias":"Private_Subnet_2" }
Then roles/vpc/tasks/main.yml file will be like this:
---
- name: Creating an AWS VPC inside mentioned Region
ec2_vpc:
region: "{{ vpc_region }}"
state: present
cidr_block: "{{ vpc_cidr_block }}"
resource_tags: { "Name":"{{ vpc_name }}-vpc", "Environment":"{{ ENVIRONMENT }}" }
subnets: "{{ vpc_subnets }}"
internet_gateway: yes
register: vpc
- name: Tag the Internet Gateway
ec2_tag:
resource: "{{ vpc.igw_id }}"
region: "{{ vpc_region }}"
state: present
tags:
Name: "{{ vpc_name }}-igw"
register: igw
- name: Set up Public Subnets Route Table
ec2_vpc_route_table:
vpc_id: "{{ vpc.vpc_id }}"
region: "{{ vpc_region }}"
state: present
tags:
Name: "Public-RT-for-{{ vpc_name }}-vpc"
subnets:
"{{ vpc.subnets | get_public_subnets_ids('Type','Public') }}"
routes:
- dest: 0.0.0.0/0
gateway_id: "{{ vpc.igw_id }}"
register: public_rt
For complete reference, take a look at this github repo.
Hope it help you or others.