Python script to automatically sync instances via AWS CodeDeploy APIs
This library is licensed under the Apache 2.0 License.
This architecture provides a set of instructions for deploying code to newly launched EC2 instances using Amazon CodeDeploy with AWS Lambda and AWS Cloudwatch Events
You have an existing CodeDeploy application with more than 1 instance in the deployment group. Its also assumed that you have a CodeDeploy Service role already created. You have to update the EC2 instances with CodeDeployGroup and Application Tag
There is a CloudWatch Events rule which triggers a lambda for every EC2 instance launch. Lambda parses the new instance information and extracts 3 tags – Name, CodeDeployDeploymentGroup and CodeDeployApplication. Then it adds the EC2 instance to the deployment group obtained from the instance tags. Once added, lambda queries codedeploy to retrieve last successful deployment. Finally, it creates a new deployment with updateOutdatedInstancesOnly flag, so only the new instance added to the deployment group is synchronized with the new code.
You can launch this CloudFormation stack in the US East (N. Virginia) Region in your account:
Assumption:
- You already have couple of instances - CodeDeployDemo and CodeDeployDemo2 as part of your deployment group. They have Name, CodeDeployApplication and CodeDeployDeploymentGroup Tags on them.
- You have a successful deployment and have noted the deployment-id
Goal of the Test:
If a new instance with Name, CodeDeployApplication and CodeDeployDeploymentGroup tag gets introduced, it will be added to the respective deployment group. Finally the last successful deployment will be pushed to the new instance
New EC2 instance with the appropriate tags is launched
Lambda is triggered as evident from the Cloudwatch Logs:
{[ "arn:aws:ec2:us-east-1:xxxxxxxxxxxxxxx:instance/i-00203362b337dd743"] }
Here it is looking up the last deployment id and gets the artifacts associated with that
DepId is d-CSBCXR2GP
Finally, its creates a new deployment to synch the latest instance:
"{u'deploymentId': u'd-W6E1TFFGP', 'ResponseMetadata': {'RetryAttempts': 0, 'HTTPStatusCode': 200, 'RequestId': '73046797-bb22-11e7-ad7b-25693e030410', 'HTTPHeaders': {'x-amzn-requestid': '73046797-bb22-11e7-ad7b-25693e030410', 'content-length': '30', 'content-type': 'application/x-amz-json-1.1'}}} "
Post lambda run
New instance is synched with the latest deployment
