fix: pass dnsconfig to agent pod. Fixes: #12824

docs/fields.md

@@ -801,7 +801,7 @@ WorkflowSpec is the specification of a Workflow.
 |`artifactRepositoryRef`|[`ArtifactRepositoryRef`](#artifactrepositoryref)|ArtifactRepositoryRef specifies the configMap name and key containing the artifact repository config.|
 |`automountServiceAccountToken`|`boolean`|AutomountServiceAccountToken indicates whether a service account token should be automatically mounted in pods. ServiceAccountName of ExecutorConfig must be specified if this value is false.|
 |`dnsConfig`|[`PodDNSConfig`](#poddnsconfig)|PodDNSConfig defines the DNS parameters of a pod in addition to those generated from DNSPolicy.|
-|`dnsPolicy`|`string`|Set DNS policy for the pod. Defaults to "ClusterFirst". Valid values are 'ClusterFirstWithHostNet', 'ClusterFirst', 'Default' or 'None'. DNS parameters given in DNSConfig will be merged with the policy selected with DNSPolicy. To have DNS options set along with hostNetwork, you have to specify DNS policy explicitly to 'ClusterFirstWithHostNet'.|
+|`dnsPolicy`|`string`|Set DNS policy for workflow pods. Defaults to "ClusterFirst". Valid values are 'ClusterFirstWithHostNet', 'ClusterFirst', 'Default' or 'None'. DNS parameters given in DNSConfig will be merged with the policy selected with DNSPolicy. To have DNS options set along with hostNetwork, you have to specify DNS policy explicitly to 'ClusterFirstWithHostNet'.|
 |`entrypoint`|`string`|Entrypoint is a template reference to the starting point of the io.argoproj.workflow.v1alpha1.|
 |`executor`|[`ExecutorConfig`](#executorconfig)|Executor holds configurations of executor containers of the io.argoproj.workflow.v1alpha1.|
 |`hooks`|[`LifecycleHook`](#lifecyclehook)|Hooks holds the lifecycle hook which is invoked at lifecycle of step, irrespective of the success, failure, or error status of the primary step|

pkg/apis/workflow/v1alpha1/workflow_types.go

@@ -326,7 +326,7 @@ type WorkflowSpec struct {
 	// Host networking requested for this workflow pod. Default to false.
 	HostNetwork *bool `json:"hostNetwork,omitempty" protobuf:"bytes,14,opt,name=hostNetwork"`
 
-	// Set DNS policy for the pod.
+	// Set DNS policy for workflow pods.
 	// Defaults to "ClusterFirst".
 	// Valid values are 'ClusterFirstWithHostNet', 'ClusterFirst', 'Default' or 'None'.
 	// DNS parameters given in DNSConfig will be merged with the policy selected with DNSPolicy.

workflow/controller/agent.go

@@ -243,6 +243,7 @@ func (woc *wfOperationCtx) createAgentPod(ctx context.Context) (*apiv1.Pod, erro
 	tmpl := &wfv1.Template{}
 	woc.addSchedulingConstraints(pod, woc.execWf.Spec.DeepCopy(), tmpl, "")
 	woc.addMetadata(pod, tmpl)
+	woc.addDNSConfig(pod)
 
 	if woc.execWf.Spec.HasPodSpecPatch() {
 		patchedPodSpec, err := util.ApplyPodSpecPatch(pod.Spec, woc.execWf.Spec.PodSpecPatch)

workflow/controller/workflowpod.go

@@ -200,13 +200,7 @@ func (woc *wfOperationCtx) createWorkflowPod(ctx context.Context, nodeName strin
 		pod.Spec.HostNetwork = *woc.execWf.Spec.HostNetwork
 	}
 
-	if woc.execWf.Spec.DNSPolicy != nil {
-		pod.Spec.DNSPolicy = *woc.execWf.Spec.DNSPolicy
-	}
-
-	if woc.execWf.Spec.DNSConfig != nil {
-		pod.Spec.DNSConfig = woc.execWf.Spec.DNSConfig
-	}
+	woc.addDNSConfig(pod)
 
 	if woc.controller.Config.InstanceID != "" {
 		pod.ObjectMeta.Labels[common.LabelKeyControllerInstanceID] = woc.controller.Config.InstanceID
@@ -756,6 +750,17 @@ func (woc *wfOperationCtx) addMetadata(pod *apiv1.Pod, tmpl *wfv1.Template) {
 	}
 }
 
+// addDNSConfig applies DNSConfig to the pod
+func (woc *wfOperationCtx) addDNSConfig(pod *apiv1.Pod) {
+	if woc.execWf.Spec.DNSPolicy != nil {
+		pod.Spec.DNSPolicy = *woc.execWf.Spec.DNSPolicy
+	}
+
+	if woc.execWf.Spec.DNSConfig != nil {
+		pod.Spec.DNSConfig = woc.execWf.Spec.DNSConfig
+	}
+}
+
 // addSchedulingConstraints applies any node selectors or affinity rules to the pod, either set in the workflow or the template
 func (woc *wfOperationCtx) addSchedulingConstraints(pod *apiv1.Pod, wfSpec *wfv1.WorkflowSpec, tmpl *wfv1.Template, nodeName string) {
 	// Get boundaryNode Template (if specified)