dns-policy-clusterfirst.yaml

kind: Pod                         # resources
apiVersion: v1                    # api group
metadata:                         # contain less but important information about Pod
  name: firsthost-policy            # Should be unique | case sensitive 
  labels:                         # useful to detect Pod within cluster
    policy: clusterhost
spec:                                 # Pod template begins
  containers:                         # pod.spec.containers
    - image: bash                     # image name 
      name: bash-3                    # container name, if other pods has same container name doesn't effect.
      command: ["sleep","4500"]       # command to run as a main process. If we use /bin/sh then shell will execute this process.
  dnsPolicy: ClusterFirstWithHostNet              # policy type is Default.  Others are: ClusterFirst | None | Default
  hostNetwork: true                     # Should be true if we defining, dnsPolicy: ClusterFirstWithHostNet
                                        # It takes same entry as in host system have in /etc/hosts
                                        # Can see all ip addresses, because accessing host network