Is it possible to run a docker image with different environment variables in the container as specified by a Flow parameter? Locally, I can do this via

docker run -env FOO=BAR <my_docker_image>

I would like to be able to execute a flow on this image with a Docker Agent by calling the flow with the parameters

{
  "FOO": "BAR"
}

Is this possible with Prefect? Or is there a Prefect idiom for such a concept? Use cases for changing environment variables on container create/flow execution would be 1. defining which customer code path we want to trigger (database, configs, special methods and permissions) 2. Setting how we want to persist data (which database type to use, how to cache)

Hey Josh, you can set the

RunConfig

per flow run and it has an environment variables section.

It would be

DockerRun(...,env={"FOO":"BAR"})

But I wouldn’t be able to change that on a per-flow basis by setting a parameter would I? The flows would be forced to have one permanent environment variable

You can change the run config per flow run the same way you'd change parameters

For instance if I wanted to have a

run_models

flow and I wanted to set the databases used based on the environment variable, I wouldn’t be able to do that with the Prefect Flow Parameters would I?

How are you creating your flow runs?

via schedule or UI

The UI has a run config menu while creating a flow run

Got it. I see it now in the “advanced” section

I'm not sure we actually provide it via schedules yet

I’m calling some methods of a legacy service that is configured via ENV variables. Was originally built to be a web-server and has logic in there we would like to call ad-hoc via Prefect

Hmm.. You could inject things into

os.environ

based on parameters if it's a Python service.