CodeDeploy

💡 Definition

AWS CodeDeploy is a service that automates code deployments to any instance, including Amazon EC2 instances, on-premises servers, serverless Lambda functions, and Amazon ECS services.

🔑 Key Concepts

• Automated Deployments: Handles the complexity of updating applications.
• In-Place Deployments: Updates application code on the instances directly.
• Blue/Green Deployments: New version deployed to a separate set of instances, then traffic is shifted (for zero downtime).
• Deployment Groups: Sets of instances where you want to deploy your application.
• Application Revision: The new version of your application code and associated files.

⚙️ How it Works

1. Define Application: Register your application with CodeDeploy.
2. Create Deployment Group: Specify the target instances (e.g., specific EC2 tags, Lambda function).
3. Upload Revision: Upload your new code (e.g., to S3 or CodeCommit).
4. Deploy: CodeDeploy follows a specified deployment configuration (e.g., "AllAtOnce," "OneAtATime," "HalfAtATime") to update your application.

🎯 Use Cases

• Continuous Deployment: Automating the release process as part of a CI/CD pipeline.
• Reducing Downtime: Performing updates without service interruption using blue/green deployments.
• Consistent Deployments: Ensuring the same code is deployed across all target environments.

💰 Pricing Model

• EC2/On-Premises Deployments: Free.
• Lambda Deployments: Free.
• Amazon ECS Deployments: Charged per deployment.

📝 Exam Tips (CLF-C02)

• CodeDeploy automates application deployments.
• Supports deployments to EC2, on-premises, and Lambda.
• Focuses on reducing downtime during deployments.
• Part of the AWS Developer Tools suite (alongside CodeCommit, CodeBuild, CodePipeline).

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See Also: * EC2 * Lambda * CloudFormation * CodePipeline