CRD Spec: add option to configure HostNetwork and DNSPolicy

this allows the network plugins like CNI to use etcd-cluster
as kv when bootstrapping the cluster

fixes coreos#1929

pkg/apis/etcd/v1beta2/cluster.go

@@ -162,6 +162,12 @@ type PodPolicy struct {
  // '.cluster.local'.
  // The default is to not set a cluster domain explicitly.
  ClusterDomain string `json:"ClusterDomain"`
+
+ // hostNetwork will set HostNetwork: true in podspec
+ HostNetwork bool `json:"hostNetwork,omitempty"`
+
+ // dnsPolicy will set dnsPolicy: <whatever> in podspec
+ DNSPolicy v1.DNSPolicy `json:"dnsPolicy,omitempty"`
 }
 
 // TODO: move this to initializer

pkg/util/k8sutil/k8sutil.go

@@ -402,6 +402,15 @@ func newEtcdPod(m *etcdutil.Member, initialCluster []string, clusterName, state,
  SecurityContext: podSecurityContext(cs.Pod),
  },
  }
+
+ if cs.Pod.DNSPolicy != "" {
+ pod.Spec.DNSPolicy = cs.Pod.DNSPolicy
+ }
+
+ if cs.Pod.HostNetwork {
+ pod.Spec.HostNetwork = true
+ }
+
  SetEtcdVersion(pod, cs.Version)
  return pod
 }