Terraform vs Ansible: Provisioning vs Configuration Management

Sun, 02 Aug 2026 11:25:27 +0900

Overview

Terraform and Ansible are both infrastructure-as-code tools but solve different problems: Terraform declaratively provisions and tracks cloud infrastructure using a state file, while Ansible procedurally configures and manages software on existing hosts with no persistent state. Many teams use them together — Terraform to stand up infrastructure, Ansible to configure it.

Comparison Diagram

Comparison Table

Aspect	Terraform	Ansible
Primary purpose	Provision and tear down cloud/infra resources (VMs, networks, DBs)	Configure software and manage state on existing hosts
Configuration language	HCL (HashiCorp Configuration Language), declarative	YAML playbooks, procedural task lists
Execution model	Builds a dependency graph and applies changes in parallel where possible	Executes tasks sequentially, in order, per host
State management	Maintains a state file mapping config to real resources	Stateless — queries live system facts on each run
Idempotency approach	Diffs desired config against state file before acting	Each module checks current condition before making a change
Connectivity/agent requirement	Agentless — calls cloud/provider APIs directly	Agentless — connects over SSH or WinRM to target hosts
Failure & recovery handling	Partial applies are resolved by re-running against the state file	Reruns the playbook from the start; tasks are re-checked, not resumed

Key Differences

Terraform tracks infrastructure in a persistent state file; Ansible has no state store and reads live system facts each run.
Terraform resolves a dependency graph to apply changes in parallel; Ansible runs tasks sequentially.
Terraform talks to infrastructure through provider APIs; Ansible connects to hosts via SSH/WinRM.
Terraform is built for provisioning infra; Ansible is built for configuration of what already exists.
They’re commonly paired: Terraform creates the servers, then Ansible configures them.

When to Use Each

Terraform

Ansible on IT Comparison

Terraform vs Ansible: Provisioning vs Configuration Management

Overview

Comparison Diagram

Comparison Table

Key Differences

When to Use Each