CodeDeploy::DeploymentGroup Error: The list of target group pairs must have exactly one pair
I am creating a cloudformation nestedDeployment(CodeBuild Project and CodeDeploy Application) with a Blue/Green Deployment, for an ECS (Fargate Managed) Deployment. The Deployment fails in the creation of the CodeDeployment Group with this error:
"The list of target group pairs must have exactly one pair (Service: AmazonCodeDeploy; Status Code: 400; Error Code: InvalidTargetGroupPairException; Request ID: xxxxxx)"
My nested Deployment has an alb and the ouputs are seen in this deployment as importvalues, the output values are - ECSTargetGroup1Name, ECSTargetGroup1Name (With the export from the alb as - Value: !GetAtt ECSTargetGroup1.TargetGroupName and Value: !GetAtt ECSTargetGroup2.TargetGroupName). Same applies for the ECS ClusterName with its output-export in it's yaml file.
My two cents in understanding this error is suggesting i may have declared wrongly the target groups in the TargetGroupPairInfoList.
Any help with this will be appreciated.
An excerpt of my code is this,
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Hi, at https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-codedeploy-deploymentgroup-loadbalancerinfo.html it says TargetGroupPairInfoList is "an array of TargeGroupPairInfo objects with a maximum size of one". You've provided an array with 3 elements in it.
What you need is:
TargetGroupPairInfoList:
- ProdTrafficRoute: # 03:10 UTC I just edited this as in my haste earlier I forgot the "-". Had a sudden realisation while brushing my teeth (it's 11:10PM here). :)
TrafficRoute
TargetGroups:
- TargetGroupInfo
TestTrafficRoute:
TrafficRoute
Not this:
TargetGroupPairInfoList:
- ProdTrafficRoute:
TrafficRoute
- TargetGroups:
- TargetGroupInfo
- TestTrafficRoute:
TrafficRoute
Thanks this fixed it for me, i see i formated it wrongly.