hashicorp-terraform-associate-certification-notes

Table of Contents

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• Infrastructure as Code
• What is Hashicorp ?
• What is Taerraform ?

Reference

• Terraform official site

Infrastructure as Code

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• You write a configuration script to automate creating, updating or destroying cloud infrastructure

Infrastructure Lifecycle

• How does IaC enhance the Infrastructure Lifecycle?
  • Reliability
    • IaC makes changes idempotent, consistent, repeatable and predictable
      • {Idempotent: No matter how many times you run IaC, you will end up with the same state that is expected}
  • Manageability
    • enable mutation via code
    • revised, with minimal changes
  • Sensibility
    • avoid financial and reputational losses to even loss of life when considering government and military dependencies on infrastructure

GitOps

• GitOps is when you take Infrastructure as Code (IaC) and you use a git repository to introduce a formal process to review and accept changes to infrastructure code, once that code is accepted, it automatically triggers a deploy

Immutable Infrastructure Guarantee

• Terraform encourages you towards an immutable Infrastructure architect so you get the following guarantees
• Cloud Resource Failure - What if EC2 instance fails a status check?
• Application Failure - What if your post installation script fails due to change in package?
• Time to Deploy - What if I need to deploy in a hurray?
• Worst Case Scenario -
  • Accidental Deletion
  • Compromised by malicious actor
  • Need to Change Regions (region outrage)

What is Hashicorp?

• Hashicorp is a company specializing in managed open-source tools used to support the development and deployment of large-scale service -oriented software installations
  • What is HAshicorp platform ?
    • HCP is a unified platform to access Hashicorp various products
    • HCP services are cloud agnostic
    • support for the main cloud service providers (CSPs)
      • e.g AWS, GCP and Azure
    • highly suited for work loads

What is Terraform?

• Terraform is a open-source and cloud-agnostic Infrastructure as Code (IaC) Tool

• Terraform uses declarative configuration files

• The configuration files are written in Hashicorp Configuration Language (HCL)

  What is Terraform CLoud ?

  • Terraform cloud is a Software as Service (SaaS) offering for:
    • Remote state storage
    • Version Control integrations
    • FLexible workflows
    • Collaborate on Infrastructure changes in a single unified web portal

  Terraform Lifecycle

  
  • Change Management
    • Approach to apply change and resolving conflicts brought about by change
  • Change Automation
    • automatically creating a consistent, systematic and predictable way of managing change request bia controls and policies

  Terraform Resource Graph

  • Terraform builds a dependency graph from the terraform configurations, and walks this graph to generate plans, refresh state and more

  Terraform Core and Terraform Plugins

  • Terraform is logically split into two main parts:
    1. Terraform Core
       • Uses remote procedure calls (RPC) to communicate with Terraform plugins
    2. Terraform Plugins
       • expose an implementation for a specific service, or provisioner