CodeCommit and CodeBuild Basics

Welcome to the world of Continuous Integration and Continuous Delivery (CI/CD) on AWS!

CI/CD is a set of practices that help developers deliver code changes more frequently and reliably. It involves automating the steps from code commit to deployment.

In this lesson, we'll explore two fundamental AWS services for CI/CD: CodeCommit for source control and CodeBuild for automated compilation and testing.

AWS CodeCommit is a fully managed source control service that hosts secure Git-based repositories.

Think of it as AWS's version of GitHub or GitLab, but tightly integrated with other AWS services. It's designed for collaborative software development, allowing teams to store and manage their code securely.

CodeCommit offers several key features:

• Private Repositories: Host your code securely without public exposure.
• Git Compatibility: Works seamlessly with standard Git clients and commands.
• Collaboration: Supports branches, pull requests, and merge workflows for team development.
• Security: Integrates with AWS Identity and Access Management (IAM) for fine-grained access control and encrypts your code at rest and in transit.

To start using CodeCommit, you first create a repository. This is where your project's code will live.

You can create a repository easily through the AWS Management Console, AWS CLI, or SDKs. Once created, you'll get a URL to clone it, just like any other Git repository.

After creating a repository, you'll want to clone it to your local machine to start coding. AWS CodeCommit uses Git credentials for authentication.

You can configure either HTTPS Git credentials or SSH keys to connect. This ensures only authorized users can push or pull code from your repository.

Here's how you might clone a repository locally:

Now that your code is in CodeCommit, how do you build and test it automatically? That's where AWS CodeBuild comes in.

CodeBuild is a fully managed continuous integration service that compiles source code, runs tests, and produces deployable software packages. It eliminates the need to provision or scale your own build servers.

CodeBuild integrates with source providers like CodeCommit, S3, or GitHub. When triggered, it:

1. Pulls your source code.
2. Uses a buildspec file (a YAML file) to execute build commands.
3. Generates build artifacts (e.g., compiled code, zip files).
4. Uploads these artifacts to an S3 bucket.

It's an on-demand service, meaning you only pay for the compute time consumed.

The buildspec.yml file is the heart of your CodeBuild project. It's a YAML-formatted file that defines the commands and settings for your build process.

It typically includes different phases:

• install: Install dependencies.
• pre_build: Commands to run before the build.
• build: The main build commands.
• post_build: Commands to run after the build (e.g., run tests, package artifacts).

Here's what a basic buildspec.yml might look like for a simple application. This file tells CodeBuild what steps to take.

It defines the build environment, commands to execute in different phases, and what files to include in the output artifact.

Let's check your understanding of AWS CodeCommit and CodeBuild.

In this lesson, you've learned the basics of two core AWS services for CI/CD:

• AWS CodeCommit: A managed Git service for secure, collaborative source control.
• AWS CodeBuild: A fully managed service for compiling, testing, and packaging your code automatically.

These services form the foundation for automating your development pipeline on AWS, ensuring your code is version-controlled, built, and tested efficiently.