> ## Documentation Index > Fetch the complete documentation index at: https://notes.kodekloud.com/llms.txt > Use this file to discover all available pages before exploring further. # Build stage with AWS CodeBuild > This article explains how to use AWS CodeBuild in a CI/CD pipeline for building, testing, and packaging applications. In a CI/CD pipeline, the build stage compiles source code, runs tests, and packages artifacts. AWS CodeBuild is a fully managed build service that integrates seamlessly with AWS CodePipeline, scaling on demand and only charging you for build minutes used. ## Preconfigured Build Environments AWS CodeBuild offers a rich set of managed images out of-the-box: | Runtime | Version Examples | | ------- | ----------------------------- | | Java | OpenJDK 8, Amazon Corretto 11 | | Ruby | MRI 2.7, 3.0 | | Go | 1.x | | Node.js | 12.x, 14.x, 16.x | | Android | SDK 29–31 | | .NET | Core 3.1, 5.0, 6.0 | | PHP | 7.4, 8.0 | | Docker | Docker Engine 20.10 | You can also supply a custom Docker image stored in Amazon ECR or a public registry to match your exact build requirements. ![The image lists various programming environments such as Java, Ruby, GoLang, Node.js, Android, Microsoft.NET, PHP, and Docker, under the heading "Preconfigured Environments."](https://kodekloud.com/kk-media/image/upload/v1752862582/notes-assets/images/AWS-CodePipeline-CICD-Pipeline-Build-stage-with-AWS-CodeBuild/preconfigured-environments-programming-languages.jpg) ## CodeBuild Workflow When you trigger a build, CodeBuild orchestrates the following steps: 1. **Provision** a temporary compute container based on your project settings. 2. **Initialize** the specified runtime environment. 3. **Download** your source code from the configured repository. 4. **Execute** lifecycle commands defined in `buildspec.yml`. 5. **Upload** build artifacts to Amazon S3 or your chosen destination. 6. **Tear down** the temporary container. ![The image outlines the CodeBuild process in six steps: creating a temporary compute container, loading the runtime environment, downloading source code, executing project commands, uploading artifacts to S3, and removing the temporary container.](https://kodekloud.com/kk-media/image/upload/v1752862583/notes-assets/images/AWS-CodePipeline-CICD-Pipeline-Build-stage-with-AWS-CodeBuild/codebuild-process-six-steps-outline.jpg) Here’s a sample `buildspec.yml`: ```yaml theme={null} version: 0.2 phases: install: commands: - echo Installing dependencies... - npm install build: commands: - echo Running unit tests... - npm test - echo Building production bundle... - npm run build artifacts: files: - 'build/**/*' discard-paths: yes base-directory: build ``` Avoid printing sensitive values (API keys, secrets) directly in build logs. Use AWS Secrets Manager or Parameter Store and inject them as environment variables. ## Monitoring and Notifications CodeBuild integrates natively with Amazon CloudWatch and SNS: | Feature | AWS Service | Purpose | | --------------------- | ---------------------- | -------------------------------- | | Logs & Metrics | Amazon CloudWatch Logs | Real-time logs, custom metrics | | Build Status Alerts | Amazon SNS | Email, SMS, HTTP endpoint alerts | | Event-Driven Triggers | CloudWatch Events | Automate downstream workflows | ![The image is a diagram showing AWS CodeBuild connected to AWS CloudWatch for monitoring and to Amazon Simple Notification Service (SNS) for notifications.](https://kodekloud.com/kk-media/image/upload/v1752862584/notes-assets/images/AWS-CodePipeline-CICD-Pipeline-Build-stage-with-AWS-CodeBuild/aws-codebuild-cloudwatch-sns-diagram.jpg) ## Automatic Scaling AWS CodeBuild automatically adjusts the number of build containers to match your concurrent jobs. There’s no provisioning or server management—just pay for the time your builds run. ![The image illustrates the concept of automatic scale-up and scale-down, showing multiple icons representing scaling processes with arrows indicating increase and decrease.](https://kodekloud.com/kk-media/image/upload/v1752862586/notes-assets/images/AWS-CodePipeline-CICD-Pipeline-Build-stage-with-AWS-CodeBuild/automatic-scale-up-down-icons-diagram.jpg) ## Summary AWS CodeBuild provides a robust, scalable build service within your CI/CD pipeline. Key takeaways: * Fully managed continuous integration service * Preconfigured runtimes or custom Docker images * Deep integration: CodePipeline, CloudWatch, SNS, IAM, and more * Automatic scaling with pay-as-you-go pricing * Supports source from S3, CodeCommit, GitHub, Bitbucket, and others * Ideal for replacing or complementing self-hosted solutions like Jenkins | Integration | AWS Service | | ------------------------ | --------------------------------- | | Source Control | S3, CodeCommit, GitHub, Bitbucket | | Build Orchestration | AWS CodePipeline, CodeBuild | | Artifact Storage | Amazon S3 | | Logging & Metrics | Amazon CloudWatch Logs | | Notifications & Triggers | Amazon SNS, CloudWatch Events | ![The image is a summary slide about AWS CodeBuild, highlighting it as a building service, for continuous integration, and usable by itself.](https://kodekloud.com/kk-media/image/upload/v1752862587/notes-assets/images/AWS-CodePipeline-CICD-Pipeline-Build-stage-with-AWS-CodeBuild/aws-codebuild-summary-continuous-integration.jpg) A hands-on demonstration—setting up a CodeBuild project, configuring a buildspec, and running your first build—will reinforce these concepts. ## Links and References * [AWS CodeBuild Documentation](https://docs.aws.amazon.com/codebuild/latest/userguide/welcome.html) * [AWS CodePipeline Documentation](https://docs.aws.amazon.com/codepipeline/latest/userguide/welcome.html) * [Amazon CloudWatch Logs](https://docs.aws.amazon.com/cloudwatch/index.html) * [Amazon SNS](https://aws.amazon.com/sns/)