Docker starts on boot, but where is the docker-compose.yml file?? Ubuntu 19.10

I have inherited the config on this server. On boot, docker starts fine. I assume from /lib/systemd/system/system/docker.service

I can use systemctl stop docker.service and then docker ps -a and I see its all stoped.

On a reboot all containers are up and running.

I need to know where the file is that tells docker to start all of the containers.

There must be a docker-compose.yml somewhere but I have been unable to find it yet.

Is there a way to find how the containers are getting started? Where the running docker got its config?

Thanks all.

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Got a little farther, but I am more confused now.

systemctl disable docker.service and systemctl disable docker.socket does stop docker on boot.

So where is docker getting its config to find containers on boot?

I even executed systemctl disable docker.service, rebooted and docker ps -a is still showing running containers…

I cant kill them. Like zombies.

I actually want to add a docker mssql image but want to know what docker config file to add them to.

I must not be getting something…