Do I need to create a custom image to add to the CMD?

I’m running prom/prometheus on my UNRAID server. I want to add --storage.tsdb.retention.time=1y to the CMD when my container runs. I have no idea how to do this on UNRAID. Do I need to create a new image from prom/prometheus or can I add it to the docker run command?

CMD is what you can override after the name of the image:

docker run [options] <image_name> <CMD>

so yes, you can change it without creating a new image.

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