Change alias name of lambda fails in combination with an ALB

If you only change the alias name of an lambda which is linked by a target group of an ALB by it;s alias it fails updating:

…is still not stable

(UPDATE_ROLLBACK_IN_PROGRESS (The following resource(s) failed to update: [iapidevnecmastertg3403BAB0]. ))
 12/18 | 6:36:11 AM | UPDATE_FAILED        | AWS::ElasticLoadBalancingV2::TargetGroup  | iapi-dev-nec-master-tg (iapidevnecmastertg3403BAB0) ElasticLoadBalancerV2 TargetGroup did not stabilize.
	new TargetGroupBase (/tmp/jsii-kernel-3gxWH2/node_modules/@aws-cdk/aws-elasticloadbalancingv2/lib/shared/base-target-group.js:31:25)
	\_ new ApplicationTargetGroup (/tmp/jsii-kernel-3gxWH2/node_modules/@aws-cdk/aws-elasticloadbalancingv2/lib/alb/application-target-group.js:15:9)

Reproduction Steps

1. create a lambda with an alias X and add it to a TG of an ALB .2 then only change the name of the alias

private Alias createLambdaAlias(Function lambda) {

return Alias.Builder.create(this, LAMDBA_ALIAS_ID).aliasName(configuration.getLambdaAliasName())
    .version(lambda.getCurrentVersion()).build();

}

private ApplicationTargetGroup createApplicationTargetGroup(Alias alias) {

LambdaTarget target = new LambdaTarget(alias);

ApplicationTargetGroup atg =
    ApplicationTargetGroup.Builder.create(this, nameConvention.getAlbTargetGroupName())
        .targetGroupName(nameConvention.getAlbTargetGroupName()).targetType(TargetType.LAMBDA)
        .targets(List.of(target)).build();

atg.setAttribute(TG_ATTR_NAME_LAMBDA_MUTLI_HEADER_ENABLE, LAMBDA_MUTLI_HEADER_ENABLE);

// Make sure that the correct permission is set before adding it to the TG
Permission lambdaAlbPermission = createALBPermission(ALB_PERMISSION_ACTION, atg);
alias.addPermission(LAMBDA_FUNCTION_ALB_PERMISSON_ID, lambdaAlbPermission);


return atg;

}

Error Log

12/18 | 6:36:11 AM | UPDATE_FAILED        | AWS::ElasticLoadBalancingV2::TargetGroup  | iapi-dev-nec-master-tg (iapidevnecmastertg3403BAB0) ElasticLoadBalancerV2 TargetGroup did not stabilize.
	new TargetGroupBase (/tmp/jsii-kernel-3gxWH2/node_modules/@aws-cdk/aws-elasticloadbalancingv2/lib/shared/base-target-group.js:31:25)
	\_ new ApplicationTargetGroup (/tmp/jsii-kernel-3gxWH2/node_modules/@aws-cdk/aws-elasticloadbalancingv2/lib/alb/application-target-group.js:15:9)

Environment

• CLI Version : 1.39
• Framework Version:
• OS : linux
• Language : Java

Other

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This is 🐛 Bug Report

[marty-se]

This caveat should at least be documented in the CDK construct, even if the underlying cause is CloudFormation? One of the selling points for CDK is the ability to refactor code, but if logical ID changes breaks CFN without notice that’s just very poor DX.

The workaround that @drice suggested worked perfectly for us (thanks), maybe that should be mentioned in the docs too?

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