DevOps Classroom Series – 03/Aug/2021

An Organizational Scenario

• This is scenario of an organization called as LearningThoughts.

• LearningThoughts has an application for HRMS => lt-hrms

• LearningThoughts has many customers and Each of customers have their own server infrastructure. Some organizations have

  • On-Premise Infrastructure:
  • Cloud Infrastructure:

• So, how does lt-hrms handle the variations in server infrastructure

• Automating deployment for multiple server infrastructures is also a challenge

  • VMWare has its own way of automation
  • HyperV has its own ways of automation
  • OpenStack Has its own way of automation
  • Azure => Azure CLI/Powershell or ARM Templates
  • AWS => AWS CLI or CloudFormation
  • GCloud => GCloud cli or Gcloud templates

• So we need an effective solution which can deploy lt-hrms app in multiple server infrastructure (Creating servers) and then to deploy application into individual server using shell/powershell/ansible/chef etc

• What are possible solutions?

  • Writing a script for all the possible infrastructures might be complex and making changes will become difficult
  • Create your own tool with the help of dev team. Maintenance becomes a challenge

• To solve these kind of issues, we need InfraProvisioning tools. We have the infraprovisioning tools such as AWS Cloudformation, Azure ARM Tempalte, Openstack Heat but they work only their environments

• Terraform is an infra provisioning tool which can work with various server infrastructures and the way we approach to write the template in terraform is declarative

  • Terraform supports Declarative Language

• Terraform is an Opensource tool developed by HashiCorp using Go Language. Terraform is all about copying one binary(executable) in the system

• 5000 feet overview of how terraform works

• To create Terraform template terraform has its own language (Domain specific language) => Terraform Configuration Language Refer Here

Softwares to be installed on the system

• Terminal:

  • Mac => Terminal
  • Windows => Powershell (Terminal)
  • Linux => Terminal

• Git

• Visual Studio Code

• Refer Here for the software installations on windows

• Refer Here

• Mac:

  • Homebrew: Refer Here for the homebrew installation. Launch terminal and execute the command /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
  • Git: brew install git
  • Visual Studio Code: Refer Here
  • terraform Refer Here

• Windows:

  • Chocolatey: Refer Here
  • Git: choco install git -y
  • VisualStudioCode: choco install vscode -y
  • terraform: choco install terraform