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COA DevOps Training UseCase

This project provides the documentation and the automation(code) for the Oracle EMEA WLA COA Demo UseCase.

We're going to showcase, by following a realistic usecase, the following:

  • a recomended teraform demo template
  • abstracting terraform configuration
  • best practices around: code, project structure, data structures, optional configuration, functions and many more
  • we'll drive you through a few operations scenarios use-cases that cover both IaC and configuration management.

Demo environment arhitecture diagram

Arhitecture diagram

Demo Usecase scenario

In this example a DevOps engineer will leverage an IaC and Configuration Management automation to:

  • provision the following OCI Infrastructure:
    • Networking:
      • one VCN and 2 subnets(private and public)
      • coresponding security rules
      • Internet and NAT GW
      • Routing rules
    • Compute:
      • one bastion host VM instance exposed on the public subnet
      • A configurable number of WEB Servers exposed to the private subnet
    • LBaaS:
      • A load balancer, exposed to the public subnet, containing:
        • backend set containing:
          • a configurable number of backend servers
        • a configurable number of listerners with SSL/no-SSL option
  • running the folloiwng configuration(terraform remote exec provider) on the provisioned VMs:
    • on bastion host:
      • upload the private ssh_key to access the backend webserver VMs
    • on the WEB Server VMs:
      • configure iptables to open port 80
      • install NGINX or Apache webserver, configure them to listen on port 80, upload a custom HTML page and start the servers.

On this topology we'll be able to demostrate the operations described bellow.

Demo automation supported operations

  • Infrastructure provisioning
  • Configuration management
  • Include configuration into the terraform dependency graph(install/uninstall) - TBA
  • Change management system - ex. open port
  • SSH public key rotation
  • LBaaS Certificate rotation
  • Cluster Scale Up/Down

Terraform project design and best practices

This automation example is meant to also cover a set of terraform coding example and best practices and provide some stardardisation of how a terraform project should be structured.

Notes