Ansible vs Terraform: What's the Difference?
Compare Ansible and Terraform, understand configuration management versus infrastructure provisioning, and learn how DevOps teams use both tools together.
Series: My 90-Day AWS & DevOps Learning Journey (27 articles)
- …
- 27Ansible vs Terraform: What's the Difference? This article
Ansible vs Terraform: What's the Difference?
Imagine you've created an EC2 instance using Terraform.
Your server is running, and AWS has successfully provisioned the infrastructure.
But now you need to install Nginx, configure the application, create directories, and start services.
Does Terraform handle everything, or do you need another tool?
This question helped me understand why DevOps engineers often use multiple automation tools instead of expecting one tool to do everything.
Two important tools in this area are Terraform and Ansible.
What Is Terraform?
Terraform is an Infrastructure as Code tool used to provision and manage infrastructure.
For example, Terraform can help you define AWS resources such as:
- EC2 instances
- VPCs and subnets
- Security groups
- S3 buckets
- Load balancers
You describe the desired infrastructure in configuration files, and Terraform determines which changes are needed.
A simplified workflow looks like this:
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Terraform Configuration
↓
Terraform Plan
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Review Changes
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Terraform Apply
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AWS InfrastructureTerraform is particularly useful when you want infrastructure to be repeatable, version-controlled, and manageable through code.
What Is Ansible?
Ansible is an automation tool commonly used for configuration management, application deployment, and repetitive administrative tasks.
For example, after an EC2 instance is ready, Ansible can help you:
- Install software packages
- Configure Nginx
- Manage files and directories
- Create users
- Deploy application files
- Start or restart services
Ansible commonly uses YAML playbooks to describe the tasks that should be performed on managed hosts.
Here's a simple example:
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- name: Configure a web server
hosts: webservers
become: true
tasks:
- name: Install Nginx
ansible.builtin.package:
name: nginx
state: present
- name: Ensure Nginx is running
ansible.builtin.service:
name: nginx
state: started
enabled: trueThis playbook describes how to install Nginx and ensure its service is running on the targeted hosts. The hosts must be reachable and the required privileges and connection settings must be configured.
Terraform vs Ansible
Although both tools automate work, their main responsibilities differ.
| Feature | Terraform | Ansible |
|---|---|---|
| Main purpose | Infrastructure provisioning and management | Configuration management and task automation |
| Typical language | HCL | YAML playbooks |
| Example task | Create an EC2 instance | Install and configure Nginx |
| State approach | Tracks managed resources using state | Typically operates through tasks and modules without Terraform-style resource state |
| AWS use case | Provision VPCs, EC2, and load balancers | Configure servers and deploy applications |
The tools can overlap in some workflows, but they are not direct replacements for each other.
Can We Use Both Together?
Yes. This is where the combination becomes especially useful.
Imagine deploying a web application on AWS.
Terraform can provision the infrastructure, while Ansible configures the operating system and application.
A simplified workflow looks like this:
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Developer
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Terraform
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Create AWS Infrastructure
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EC2 Instance Ready
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Ansible
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Install and Configure Software
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Deploy Application
↓
Running Web ApplicationFor example, Terraform might create an EC2 instance and the required networking resources. Ansible could then install Nginx and configure the web application.
This separation can make automation easier to organize and maintain.
In practice, you also need to handle inventory, connectivity, credentials, and the timing of configuration tasks.
What About CI/CD?
Both tools can be integrated into a CI/CD pipeline.
For example:
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Git Repository
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CI/CD Pipeline
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Terraform
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Provision Infrastructure
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Ansible
↓
Configure Servers
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Deploy ApplicationA pipeline can automate parts of this process, with appropriate validation, permissions, and approval steps.
For infrastructure changes, reviewing Terraform plans is important. For server configuration, testing Ansible playbooks and using appropriate access controls are equally valuable.
Which Tool Should a Beginner Learn First?
My approach is to understand the purpose of each tool before trying to master both.
If you want to learn how AWS resources are created and managed, start with Terraform.
If you want to understand Linux server administration, software installation, and configuration automation, Ansible is a valuable next step.
For a practical DevOps portfolio, learning how they work together can be more useful than simply memorizing commands.
A good beginner project would be to provision a test EC2 instance with Terraform and then configure a web server using Ansible.
Remember to secure the instance, restrict network access, and remove billable resources when the experiment is finished.
My Learning Journey
My recent learning has covered Docker, CI/CD, Terraform state, modules, and infrastructure automation.
I'm starting to see how the pieces fit together:
Terraform provisions infrastructure. Ansible configures systems. CI/CD connects the workflow.
Understanding when to use each tool is an important part of becoming a capable DevOps engineer.
💬 Let's Discuss
If you were building your first AWS DevOps project, would you learn Terraform first or Ansible first? Why?
If you've used both tools in a real project, what responsibilities do you assign to each—and what would you recommend to a beginner?
I'd love to hear practical experiences from people working with AWS, Linux, and automation.
Series: My 90-Day AWS & DevOps Learning Journey (27 articles)
- …
- 27Ansible vs Terraform: What's the Difference? This article
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