Choosing between Terraform and Ansible for Infrastructure as Code in a devops setup?

All answers to this question.

In a professional <devops> workflow, these tools are actually complementary rather than competitors. Terraform is "declarative" and excels at infrastructure provisioning—creating the VPC, subnets, and the EC2 instances themselves. Ansible is "procedural" and is generally used for configuration management—installing Nginx, managing users, and deploying your app code. While you could use Terraform's local-exec to run scripts, it’s messy. The cleanest approach is to use Terraform to build the server and then use an Ansible provisioner to configure it once it's online. This keeps your state files clean and manageable.

   Answered 2025-08-07 by Pamela Wright

Have you looked into "Immutable Infrastructure" as an alternative <devops> pattern, where you use Packer to build an image instead of configuring servers live?

   Answered 2025-08-09 by Gary Lopez

• Gary, I've heard the term but never implemented it. If we use Packer to create an AMI with Nginx already installed, does that mean we don't need Ansible at all during the deployment phase? That sounds like it would make our scaling much faster since the new instances wouldn't need to run any install scripts when they boot up. How do you handle small configuration changes in that model?

     Commented 2025-08-10 by Arthur Hill

For small setups, Terraform is enough. But as your <devops> needs grow, having Ansible's power for complex application logic is indispensable for long-term maintenance.

   Answered 2025-08-12 by Alice Green

• Alice makes a great point. We started with just Terraform but quickly realized we needed Ansible for handling multi-tier application deployments and database migrations.

     Commented 2025-08-13 by Martha Stewart