Terraform Modules for Reusable Infrastructure

By Admin · Feb 22, 2026 · Updated Apr 23, 2026 · 4 views · 3 min read

Terraform Modules for Reusable Infrastructure is a common requirement for VPS administrators. This guide provides practical instructions that you can follow on Ubuntu 22.04/24.04 or Debian 12, though most steps apply to other distributions as well.

Project Structure

When scaling this setup, consider vertical scaling (adding more RAM/CPU) first, as it's simpler to implement. Horizontal scaling adds complexity but may be necessary for high-traffic applications.


# main.tf - Terraform configuration
terraform {
  required_providers {
    null = {
      source = "hashicorp/null"
    }
  }
}

resource "null_resource" "terraform" {
  provisioner "remote-exec" {
    inline = [
      "apt-get update",
      "apt-get install -y modules",
    ]
  }
}

The output should show the service running without errors. If you see any warning messages, address them before proceeding to the next step.

Resource Definitions

The modules component plays a crucial role in the overall architecture. Understanding how it interacts with terraform will help you make better configuration decisions.


# Ansible playbook: setup.yml
---
- name: Configure terraform
  hosts: all
  become: yes
  tasks:
    - name: Install packages
      apt:
        name:
          - terraform
          - modules
        state: present
        update_cache: yes

    - name: Copy configuration
      template:
        src: templates/terraform.conf.j2
        dest: /etc/terraform/terraform.conf
        owner: root
        mode: '0644'
      notify: Restart terraform

  handlers:
    - name: Restart terraform
      systemd:
        name: terraform
        state: restarted

The output should show the service running without errors. If you see any warning messages, address them before proceeding to the next step.

Keep all software components up to date
Use SSH keys instead of password authentication
Set up fail2ban for brute force protection
Enable firewall and allow only necessary ports

Variable Management

The modules component plays a crucial role in the overall architecture. Understanding how it interacts with terraform will help you make better configuration decisions.


# main.tf - Terraform configuration
terraform {
  required_providers {
    null = {
      source = "hashicorp/null"
    }
  }
}

resource "null_resource" "terraform" {
  provisioner "remote-exec" {
    inline = [
      "apt-get update",
      "apt-get install -y modules",
    ]
  }
}

The configuration above sets the recommended values for a VPS with 2-4GB of RAM. Adjust the memory-related settings proportionally if your server has different specifications.

State and Version Control

Regular maintenance is essential for keeping your terraform installation running smoothly. Schedule periodic reviews of log files, disk usage, and security updates to prevent issues before they occur.


# Ansible playbook: setup.yml
---
- name: Configure terraform
  hosts: all
  become: yes
  tasks:
    - name: Install packages
      apt:
        name:
          - terraform
          - modules
        state: present
        update_cache: yes

    - name: Copy configuration
      template:
        src: templates/terraform.conf.j2
        dest: /etc/terraform/terraform.conf
        owner: root
        mode: '0644'
      notify: Restart terraform

  handlers:
    - name: Restart terraform
      systemd:
        name: terraform
        state: restarted