TerraformProj_AWS

Purpose:

Terraform Project - For creating AWS environment, with parameters for

• DEV/UAT/PRD
• No of Instances
• Type of Instance
• Zone / Region
• No of zones for implementation

Details:

• Network Setup : First module that needs to be run. Sets up the required AWS environment. Executed through Jenkins Pipeline
  • VPC
  • Internet Gateway
  • Public & Private subnets
  • Routing Table & its associations
  • DNS Zones
• AppInfra Setup : Sets up the required instances and other application infrastructure. Executed through Jenkins Pipeline.
  • Web Servers:
    • ELB
    • Auto Scale
    • Launch Config
    • Group
    • Scaling policy
    • Cloud Watch
    • IAM Roles & Security Groups
    • Install Nginx
  • DB Servers:
    • EC2 Instances
    • DNS Records
    • Cloud Watch & Health Checks
    • IAM Roles & Security Groups
    • Install MySQL
  • NAT Instances
    • EC2 Instance & Security Groups
  • S3 Buckets
• Ansible Pipeline: Basic Filecopy post discovery of environment
  • Collects Host details and generates Inventory file
  • Copys basic html files to web servers

How it works:

• Jenkins pipe line is invoked with parameters
  • DEV/ UAT / PROD on AWS Instances.
  • To Build or Destroy the AWS Instances
  • No of Servers, CIDR, Zone, # of Availability Zones to scale to etc are in respective **variables.auto.tfvars
  • Network Setup needs to be invoked first, followed by App Infra setup.
  • Ansible Pipeline is triggered manually.

Points to note:

- Terraform:
   - Installed on same server as Jenkins
   - Terraform 0.12 used
- Jenkins : 
   - Terraform needs to be configured on Jenkins as plugin
   - Jenkins is on Windows server for this implementation. Calls might need to be modified accordingly.
   - AWS SSH Keys and other secure parameters are setup as secure keys in Jenkins.  
   - 3 Pipeline jobs will need to be created one each for Network, App & AnsiblePlaybook.
 - Ansible : 
   - The test uses WSL implementation of Ansible, hence pipeline batch file executions need to be modified accordingly.
   - The discovery code might need tweeking to suite individual needs. 

Credits:

  Base learnings from - https://github.com/ned1313/Deep-Dive-Terraform