Every ECS Service must belong to a Cluster. On CloudStack Canvas this is expressed as an edge between the Cluster node and the Service node. Without the connection, the generator uses a placeholder ARN that CloudFormation will reject.
Paste into this field
No field to fill — draw an edge on the canvasOutput looks like
Canvas edge: ECS Cluster → ECS ServiceA Cluster is a logical boundary for ECS resources. Fargate tasks run serverlessly inside a cluster; EC2-backed clusters run on instances you manage. The cluster itself has no cost — you pay for the tasks/instances inside it.
In the CloudStack Canvas sidebar, find "ECS Cluster" under Containers and drag it onto the canvas.
Hover over the ECS Cluster node until connection handles appear on its border. Click and drag from the Cluster to your ECS Service node. Release on the Service node to create the edge.
Open Export again — the "ECS Service is not connected to an ECS Cluster" error should be gone.
Once you have the value, go back to CloudStack Canvas and paste it into the highlighted field.
CloudStack Canvas · Validation Guide