An example of minimum required deployment config for OpenShift

minimal-dc.yaml

kind: DeploymentConfig
apiVersion: v1
metadata:
  name: minimal-dc
spec:
  replicas: 1
  selector:
    name: busybox
  template:
    metadata:
      labels:
        name: busybox
    spec:
      containers:
      - name: busybox
        image: busybox
        args:
        - /bin/sh
        - -c
        - >
          while true; do
            sleep 10;
          done

containers is an array of the containers to be contained within the pod. It's certainly possible to provide more than 1 element in the array to have multiple containers in the pod, however it's typically more common to see just 1

By default, the image within the containers array will use Dockerhub as the image repository to lookup. If you want to reference an image within your local cluster, you can either use the oc set image-lookup command (use oc set image-lookup -h for more details) to force local lookups for the specified image, or you can rely on ImageChange triggers and leave the image field off entirely.