kubectl create deploy nginx --image nginx --dry-run=client -o yaml >nginx-deploy.yaml
vi nginx-deploy.yaml
# add volume mounts and volumes from configMap

# create config Map
echo Linuxhotel >index.html

kubectl create configmap htdocs --from-file index.html=index.html --dry-run=client -o yaml >htdocs-cm.yaml

kubectl -n nginx apply -f htdocs-cm.yaml 
kubectl -n nginx apply -f nginx-deploy.yaml

kubectl -n nginx exec -ti nginx-6fc76484c-q8tmd -- /bin/sh
# more /usr/share/nginx/html/index.html

kubectl edit -n nginx cm htdocs
# change content
apiVersion: v1
data:
  index.html: |
    Linuxhotel Cloud Native Base Camp
kind: ConfigMap
metadata:
  name: htdocs

# See it change at running pods!

kubectl -n nginx exec -ti nginx-6fc76484c-q8tmd -- /bin/sh
# more /usr/share/nginx/html/index.html
Linuxhotel Cloud Native Base Camp




htdocs-cm.yaml

    apiVersion: v1
    data:
      index.html: |
        Linuxhotel
    kind: ConfigMap
    metadata:
      creationTimestamp: null
      name: htdocs




nginx-deploy.yaml

    apiVersion: apps/v1
    kind: Deployment
    metadata:
      creationTimestamp: null
      labels:
        app: nginx
      name: nginx
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: nginx
      strategy: {}
      template:
        metadata:
          creationTimestamp: null
          labels:
            app: nginx
        spec:
          containers:
          - image: nginx
            name: nginx
            resources: {}
            volumeMounts:
              - name: htdocs
                mountPath: /usr/share/nginx/html
          volumes:
          - name: htdocs
            configMap:
               name: htdocs
    status: {}