I'm new to gitlab ci/cd. I want to deploy gitlab-runner on kubernetes, and I use kubernetes to create two resource:

gitlab-runner-configmap.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: gitlab-runner
  namespace: gitlab
data:
  config.toml: |
    concurrent = 4

    [[runners]]
      name = "Kubernetes Runner"
      url = "http:my-gitlab.com/ci"
      token = "token...."
      executor = "kubernetes"
      tag = "my-runner"
      [runners.kubernetes]
        namespace = "gitlab"
        image = "busybox"

gitlab-runner-deployment.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: gitlab-runner
  namespace: gitlab
spec:
  replicas: 1
  selector:
    matchLabels:
      name: gitlab-runner
  template:
    metadata:
      labels:
        name: gitlab-runner
    spec:
      containers:
      - args:
        - run
        image: gitlab/gitlab-runner:v11.11.3
        imagePullPolicy: Always
        name: gitlab-runner
        volumeMounts:
        - mountPath: /etc/gitlab-runner
          name: config
        - mountPath: /etc/ssl/certs
          name: cacerts
          readOnly: true
      restartPolicy: Always
      volumes:
      - configMap:
          name: gitlab-runner
        name: config
      - hostPath:
          path: /usr/share/ca-certificates/mozilla
        name: cacerts

The problem is that after creating the two resource using kubectl apply. I can't see the runner instance in http://my-gitlab.com/admin/runners. I suspect the reason is that I have not register the runner. And I enter the runner pod pod/gitlab-runner-69d894d7f8-pjrxn and register the runner manually through gitlab-runner register, after that I can see the runner instance in http://my-gitlab.com/admin/runners.

So am I do anything wrong? Or is it has to manually register the runner inside the pod?

Thanks.