How can I prevent this default behavior?

Are you using a component to create this? It doesn’t sound like default behaviour to me

I suspect you are using

cloud.Service

? If so, I’d recommend taking a look at awsx instead - it exposes a more complete view of the ECS capabilities. The cloud package is designed to be a cross-cloud compatible feature set, which limits its capabilities relative to everything available in ECS. https://github.com/pulumi/pulumi-awsx/tree/master/nodejs/awsx/ecs

Thanks