Simple Atlantis Terraform Configuration - Atlantis-terraform Typing CST Test

Primary Use Cases

• ▸Automated Terraform plan and apply on pull requests
• ▸Enforcing GitOps workflow for Terraform infrastructure
• ▸Preventing direct, unreviewed Terraform changes
• ▸Multi-team collaboration on shared Terraform modules
• ▸Integration with CI/CD pipelines for infrastructure automation

Notable Features

• ▸Pull request automation for `terraform plan` and `terraform apply`
• ▸Integration with GitHub, GitLab, Bitbucket, and Azure DevOps
• ▸Support for multiple Terraform projects and workspaces
• ▸Automatic drift detection and plan enforcement
• ▸Audit logs and comment history for compliance

Origin & Creator

Created by runatlantis/Atlantis in 2017 to standardize GitOps-style Terraform workflows.

Industrial Note

Widely used in cloud-native environments, enterprise DevOps, and multi-cloud infrastructure automation where Terraform is the main IaC tool.

Quick Explain

• ▸Atlantis integrates Terraform with Git workflow for automated CI/CD.
• ▸Runs `terraform plan` on pull requests and `terraform apply` on merge.
• ▸Prevents unsafe Terraform operations on production infrastructure.
• ▸Tracks changes and provides comments directly in pull requests.
• ▸Supports multi-repository, multi-workspace, and multi-project configurations.

Core Features

• ▸Atlantis server - central controller that listens to Git webhooks
• ▸Atlantis webhook - triggers plan/apply events
• ▸Terraform plan automation - preview infrastructure changes
• ▸Terraform apply automation - apply approved changes
• ▸GitHub/GitLab/Bitbucket integration - PR comments and approvals

Learning Path

• ▸Learn Git-based collaboration
• ▸Understand Terraform basics and state management
• ▸Learn Atlantis PR-driven workflow
• ▸Write atlantis.yaml configurations
• ▸Integrate with Terraform modules and remote backends

Practical Examples

• ▸Automated `terraform plan` on a feature branch PR
• ▸`terraform apply` after PR approval
• ▸Multi-module Terraform project with Atlantis automation
• ▸Detecting drift and notifying teams via PR comments
• ▸Integrating Atlantis with Slack notifications for PR updates

Comparisons

• ▸Atlantis vs Terraform Cloud: GitOps PR automation vs SaaS Terraform management
• ▸Atlantis vs Jenkins: PR-level Terraform workflow vs general CI/CD
• ▸Atlantis vs GitHub Actions: Git-native automation vs workflow runner
• ▸Atlantis vs Spacelift: Open-source vs enterprise SaaS automation
• ▸Atlantis vs Terraform Enterprise: PR automation vs managed Terraform lifecycle

Strengths

• ▸Enforces review-based Terraform workflow
• ▸Prevents accidental changes to infrastructure
• ▸Supports enterprise multi-repo and multi-project setups
• ▸Integrates seamlessly into GitOps CI/CD pipelines
• ▸Provides audit trails for Terraform operations

Limitations

• ▸Requires hosting and maintaining an Atlantis server
• ▸Limited UI - mostly CLI and pull request comments
• ▸Complex setup for large-scale multi-repo environments
• ▸Does not replace Terraform state management
• ▸Requires network access from Atlantis server to Terraform backend

When NOT to Use

• ▸Projects without Terraform
• ▸Single-user environments without PR workflows
• ▸Teams not using Git-based collaboration
• ▸Infrastructure without Terraform state management
• ▸Projects preferring SaaS Terraform solutions

Cheat Sheet

• ▸atlantis plan
• ▸atlantis apply
• ▸atlantis unlock
• ▸atlantis server
• ▸atlantis help

FAQ

• ▸Can Atlantis run without Git? -> No, it depends on PR workflow.
• ▸Is Atlantis free? -> Yes, open-source under Apache 2.0.
• ▸Can Atlantis manage multiple Terraform workspaces? -> Yes, via project config.
• ▸Does Atlantis replace Terraform state? -> No, it integrates with existing backends.
• ▸Can Atlantis run outside Kubernetes? -> Yes, as Docker container or binary.

30-Day Skill Plan

• ▸Week 1: Run local Atlantis and simple plan
• ▸Week 2: Configure atlantis.yaml for one repo
• ▸Week 3: Multi-project and workspace configuration
• ▸Week 4: Integrate notifications and approvals
• ▸Week 5: Deploy Atlantis on Kubernetes with HA setup

Final Summary

• ▸Atlantis automates Terraform PR workflows with `plan` and `apply`.
• ▸Integrates Git collaboration into infrastructure automation.
• ▸Enforces safe, auditable changes with review-based approvals.
• ▸Supports multi-project, multi-repo, and multi-workspace setups.
• ▸Ideal for GitOps-style Terraform automation in enterprise and cloud-native environments.

Project Structure

• ▸Terraform code directory
• ▸atlantis.yaml - project configuration
• ▸Backend configuration for state storage
• ▸Git repository for code versioning
• ▸Optional modules and shared libraries

Basic Concepts

• ▸Project - a Terraform codebase or module in a repo
• ▸Workspace - Terraform workspace for a project
• ▸Plan - preview of Terraform changes
• ▸Apply - execution of approved Terraform changes
• ▸Locking - prevents concurrent `apply` runs

Official Docs

• ▸https://www.runatlantis.io/docs/
• ▸Atlantis GitHub Repository
• ▸atlantis.yaml Configuration Reference
• ▸Terraform Backend Integration
• ▸CI/CD and PR Automation with Atlantis