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CodeDeploy/_CodeDeploy.md

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+# CodeDeploy
+- A fully managed deploy service in the cloud.
+- Can deploy EC2, On-Prem, Lambda, or ECS.
+- Rapidly release new features.
+- Update AWS Lambda function versions.
+- Avoid downtime during application deployments.
+- Integrates with existing CI/CD tools eg. Jenkins, [[_CodePipeline|CodePipeline]].
+- Integrates with existing management tools eg. Puppet, Chef, Ansible.
+
+## Core Components
+### Application
+The unique identifier for the application being deployed. Ensures the correct combination of revision deployment configuration, and group are referenced during deployment. 
+
+### Deployment Groups
+A set of EC2 instances or Lambda Functions where the new revision is deployed to
+
+### Deployment
+This is the process and components used to apply a new application revision.
+
+### Deployment Configuration
+A set of deployment rules used during deployment - with success/failure conditions included
+
+### AppSpec File
+Contains the deployment actions that CodeDeploy should execute during deployment. 
+
+### Revision
+This is everything required to deploy a new version: AppSpec file, application files, configuration files, executables.
+
+## Deployments
+### In-Place
+- The app on each instance in the deployment group is **stopped**.
+- The latest app revision is installed, and the new version of the application is started and validated.
+- You can use a **load balancer** so that each instance is unregistered during its deployment and then restored to service after the deployment is complete.
+- ==Only deployments that use the EC2/On-Premises compute platform can use in-place deployments.==
+
+### Blue/Green
+- Instances are provisioned for the replacement environment.
+- The latest application version is installed on the replacement instances
+- An optional wait time occurs for activities such as application testing and system verification.
+- Instances in the replacement environment are registered with an ELB, causing traffic to be rerouted to them.
+- Instances in the original environment are unregistered and can be terminated or kept running for other uses.
+