Propagate dns settings to backup pods (#8845)

* Propagate dns settings to backup pods

Signed-off-by: Felix Prasse <1330854+flx5@users.noreply.github.com>

* Add changelog for PR 8845

Signed-off-by: Felix Prasse <1330854+flx5@users.noreply.github.com>

---------

Signed-off-by: Felix Prasse <1330854+flx5@users.noreply.github.com>

changelogs/unreleased/8845-flx5

@@ -0,0 +1,2 @@
+Inherit the dnsPolicy and dnsConfig from the node agent pod.
+This is done so that the kopia task uses the same configuration.

pkg/exposer/csi_snapshot.go

@@ -681,6 +681,8 @@ func (e *csiSnapshotExposer) createBackupPod(
 			RestartPolicy:                 corev1api.RestartPolicyNever,
 			SecurityContext:               securityCtx,
 			Tolerations:                   toleration,
+			DNSPolicy:                     podInfo.dnsPolicy,
+			DNSConfig:                     podInfo.dnsConfig,
 		},
 	}
 

pkg/exposer/generic_restore.go

@@ -510,6 +510,8 @@ func (e *genericRestoreExposer) createRestorePod(ctx context.Context, ownerObjec
 			RestartPolicy:                 corev1api.RestartPolicyNever,
 			SecurityContext:               securityCtx,
 			Tolerations:                   toleration,
+			DNSPolicy:                     podInfo.dnsPolicy,
+			DNSConfig:                     podInfo.dnsConfig,
 		},
 	}
 

pkg/exposer/image.go

@@ -36,6 +36,8 @@ type inheritedPodInfo struct {
 	volumes        []corev1api.Volume
 	logLevelArgs   []string
 	logFormatArgs  []string
+	dnsPolicy      v1.DNSPolicy
+	dnsConfig      *v1.PodDNSConfig
 }
 
 func getInheritedPodInfo(ctx context.Context, client kubernetes.Interface, veleroNamespace string, osType string) (inheritedPodInfo, error) {
@@ -58,6 +60,9 @@ func getInheritedPodInfo(ctx context.Context, client kubernetes.Interface, veler
 	podInfo.volumeMounts = podSpec.Containers[0].VolumeMounts
 	podInfo.volumes = podSpec.Volumes
 
+	podInfo.dnsPolicy = podSpec.DNSPolicy
+	podInfo.dnsConfig = podSpec.DNSConfig
+
 	args := podSpec.Containers[0].Args
 	for i, arg := range args {
 		if arg == "--log-format" {