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@ambitious-article-39970 you can't pass an output (ie the result of provisioning another resource) into a container definition because container definitions only take strings I would first read this: https://www.leebriggs.co.uk/blog/2021/05/09/pulumi-apply.html Then update your code to look like this: https://github.com/pulumi/examples/blob/258d3bad0a00020704743e37911c51be63c06bb4/aws-py-voting-app/__main__.py#L162

thanks I still seem to have issues when using apply to pull the string out of the output though

another soul bitten by Outputs. I'm doing fargate as well - you can find a lot of my discussions above. The solution to construct more complex JSON objects is use

Output.all

for each level of the structure that contains outputs + you cannot use

json.dumps(json.dumps())

the inner JSON will produce escaped json string which is what you do not want