Infrastructure as Code, part 2: build Docker images and deploy to Kubernetes with Terraform

The text is a detailed guide on utilizing infrastructure as code (IaC) to create, deploy, and manage applications using Docker, Kubernetes, and Terraform. It explains how to build a Docker image for a Node.js application, push it to Docker Hub, and deploy it to a Google Kubernetes Engine (GKE) cluster. The guide emphasizes the role of Dockerfiles and .dockerignore files in managing Docker images and provides a breakdown of various Terraform files, such as providers.tf, variables.tf, main.tf, deployments.tf, services.tf, and output.tf, which are essential for defining and executing Kubernetes deployments. The tutorial includes steps for initializing Terraform, creating GKE clusters, and deploying applications with Terraform, highlighting the importance of Terraform's Kubernetes provider and Kubernetes Deployment resource. Additionally, it covers the use of the terraform plan and terraform apply commands to validate and execute infrastructure changes, and concludes with instructions on how to destroy the resources to avoid unnecessary costs, inviting readers to continue to the next tutorial part to integrate these processes into CI/CD pipelines using CircleCI.

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