AWS CodeDeploy is a fully managed deployment service that automates software deployments to various compute services including Amazon EC2 instances, AWS Fargate, AWS Lambda, and on-premises servers. It enables developers to release new features rapidly while minimizing downtime during application d…AWS CodeDeploy is a fully managed deployment service that automates software deployments to various compute services including Amazon EC2 instances, AWS Fargate, AWS Lambda, and on-premises servers. It enables developers to release new features rapidly while minimizing downtime during application deployment.
Key Components:
1. **Application**: A collection of deployment groups, revisions, and configurations that define what you want to deploy.
2. **Deployment Group**: A set of instances or Lambda functions targeted for deployment, defined by tags or Auto Scaling groups.
3. **Deployment Configuration**: Rules that determine how fast deployments occur and the success/failure conditions. Options include AllAtOnce, HalfAtATime, and OneAtATime.
4. **AppSpec File**: A YAML or JSON file that specifies deployment actions, lifecycle hooks, and file locations. For EC2/on-premises, it defines source and destination files plus lifecycle scripts.
**Deployment Types:**
- **In-Place Deployment**: Updates existing instances by stopping the application, deploying new code, and restarting. Only available for EC2/on-premises.
- **Blue/Green Deployment**: Creates new instances with the updated application, then shifts traffic from old to new instances. Provides easy rollback capabilities.
**Lifecycle Hooks**: These are scripts that run at specific points during deployment, including ApplicationStop, BeforeInstall, AfterInstall, ApplicationStart, and ValidateService.
**Integration**: CodeDeploy integrates seamlessly with CodePipeline for CI/CD workflows, CodeCommit for source control, and CloudWatch for monitoring deployments.
**Rollback Features**: Automatic rollbacks can be configured when deployments fail or CloudWatch alarms are triggered, ensuring application stability.
**Benefits**: CodeDeploy eliminates manual deployment processes, reduces errors, supports multiple deployment strategies, and works across hybrid environments. It handles the complexity of updating applications while maintaining availability and providing detailed deployment tracking through the AWS Console.
AWS CodeDeploy - Complete Guide for AWS Developer Associate Exam
What is AWS CodeDeploy?
AWS CodeDeploy is a fully managed deployment service that automates software deployments to a variety of compute services such as Amazon EC2, AWS Fargate, AWS Lambda, and on-premises servers. It enables you to rapidly release new features, avoid downtime during application deployment, and handle the complexity of updating your applications.
Why is AWS CodeDeploy Important?
Understanding CodeDeploy is essential because: • It eliminates the need for error-prone manual operations • It scales with your infrastructure • It integrates seamlessly with your existing CI/CD pipeline • It provides centralized control over deployments • It supports multiple deployment strategies to minimize risk
How AWS CodeDeploy Works
Key Components:
1. Application - A name that uniquely identifies the application you want to deploy
2. Deployment Group - A set of EC2 instances or Lambda functions where you deploy your application
3. Deployment Configuration - Rules that determine how fast deployments proceed and the minimum healthy instances
4. AppSpec File - A YAML or JSON file that specifies what to deploy and lifecycle event hooks
Deployment Types:
In-Place Deployment (EC2/On-Premises only): • Application is stopped on each instance • Latest revision is installed • Application is restarted • Also known as rolling update
Blue/Green Deployment: • New instances are provisioned for the new version • Traffic is rerouted from old to new instances • Old instances can be terminated or kept running • Supports EC2, ECS, and Lambda
Deployment Configurations:
For EC2/On-Premises: • AllAtOnce - Deploys to all instances simultaneously • HalfAtATime - Deploys to half the instances at a time • OneAtATime - Deploys one instance at a time
For Lambda: • Canary - Traffic shifted in two increments • Linear - Traffic shifted in equal increments • AllAtOnce - All traffic shifted at once
AppSpec File Structure:
For EC2/On-Premises: • version - Currently only 0.0 is supported • os - linux or windows • files - Source and destination of files to copy • hooks - Lifecycle event scripts
For Lambda: • version - 0.0 • resources - Lambda function details • hooks - Validation functions (BeforeAllowTraffic, AfterAllowTraffic)