Infrastructure as Code (IaC)

2.1 Definitions

• Infrastructure: The underlying physical and virtual resources that support the operations of a business.
• Code: The machine-readable scripts and configuration files that describe the desired state of the infrastructure.
• Version Control: A system that records changes to files or sets of files over time so that you can recall specific versions later.

2.2 Benefits

• Consistency across environments.
• Speed up the deployment process.
• Improved collaboration among teams.
• Ability to track changes and rollback if necessary.

3.1 Terraform

Terraform is an open-source tool created by HashiCorp that allows you to define and provision infrastructure using a high-level configuration language.

resource "aws_instance" "example" {
  ami           = "ami-123456"
  instance_type = "t2.micro"
}

3.2 Ansible

Ansible is an open-source automation tool that can automate cloud provisioning, configuration management, application deployment, and intra-service orchestration.

- hosts: all
  tasks:
    - name: Install nginx
      yum:
        name: nginx
        state: present

4.1 Use Version Control

Always keep your infrastructure code in a version control system (e.g., Git) to track changes and collaborate effectively.

4.2 Modularize Code

Break your infrastructure code into reusable modules to promote reusability and maintainability.

4.3 Test Infrastructure Code

Implement testing for your infrastructure code to ensure that changes do not break existing configurations.

4.4 Document Everything

Keep documentation updated for your infrastructure as code practices, tools, and conventions.