Working with deployments in CodeDeploy - Amazon CodeDeploy
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Working with deployments in CodeDeploy

In CodeDeploy, a deployment is the process, and the components involved in the process, of installing content on one or more instances. This content can consist of code, web and configuration files, executables, packages, scripts, and so on. CodeDeploy deploys content that is stored in a source repository, according to the configuration rules you specify.

If you use the EC2/On-Premises compute platform, then two deployments to the same set of instances can run concurrently.

CodeDeploy provides two deployment type options, in-place deployments and blue/green deployments.

  • In-place deployment: The application on each instance in the deployment group is stopped, the latest application 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 deregistered 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. For more information about in-place deployments, see Overview of an in-place deployment.

  • Blue/green deployment: The behavior of your deployment depends on which compute platform you use:

    • Blue/green on an EC2/On-Premises compute platform: The instances in a deployment group (the original environment) are replaced by a different set of instances (the replacement environment) using these steps:

      • Instances are provisioned for the replacement environment.

      • The latest application revision 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 one or more Elastic Load Balancing load balancers, causing traffic to be rerouted to them. Instances in the original environment are deregistered and can be terminated or kept running for other uses.

      Note

      If you use an EC2/On-Premises compute platform, be aware that blue/green deployments work with Amazon EC2 instances only.

    • Blue/green on an Amazon Lambda or Amazon ECS compute platform: Traffic is shifted in increments according to a canary, linear, or all-at-once deployment configuration.

    • Blue/green deployments through Amazon CloudFormation: Traffic is shifted from your current resources to your updated resources as part of an Amazon CloudFormation stack update. Currently, only ECS blue/green deployments are supported.

    For more information about blue/green deployments, see Overview of a blue/green deployment.

For information about automatically deploying from Amazon S3, see Automatically deploy from Amazon S3 using CodeDeploy.

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