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 #1929

Author: rajatjindal

Gopkg.lock

@@ -18,7 +18,7 @@ import (
 	"errors"
 	"strings"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
@@ -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/apis/etcd/v1beta2/cluster.go

@@ -30,7 +30,7 @@ import (
 	"github.com/pborman/uuid"
 
 	appsv1beta1 "k8s.io/api/apps/v1beta1"
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
@@ -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
 }