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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