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It is technically possible to use `cloud.Task`, but you need to set some configuration to indicate you want to use an existing Cluster instead of creating a new one.  `cloud-aws:ecsClusterARN` is the main setting, but there are a couple others you may need to provide.   See <https://pulumi.io/quickstart/cloudfx/index.html>.

Alternatively, you can use `new aws.ecs.TaskDefinition` and then `runTask` from the Node.js `aws-sdk` at runtime to do this directly using AWS APIs.

I looked at the implementation of `cloud.Task` and saw it was using the node SDK - how does it distinguish preview mode from non-preview?

Looks like I extend `ComponentResource` and implment an  async `run` method? <https://github.com/pulumi/pulumi-cloud/blob/master/aws/service.ts#L883>