Add nodeselector and tolerations to pod building

Signed-off-by: Michael Tsang <michael.tsang@jetstack.io>

docs/generated/reference/output/reference/api-docs/index.html

@@ -835,6 +835,10 @@ Appears In:
 <td><code>metadata</code><br /> *<a href="#objectmeta-v1">ObjectMeta</a>*</td>
 <td></td>
 </tr>
+<tr>
+<td><code>spec</code><br /> <em>PodSpec</em></td>
+<td></td>
+</tr>
 </tbody></table>
 <h2 id="acmeissuer-v1alpha1">ACMEIssuer v1alpha1</h2>
 <table>

pkg/issuer/acme/http/pod.go

@@ -224,5 +224,21 @@ func (s *Solver) mergePodObjectMetaWithPodTemplate(pod *corev1.Pod, podTempl *v1
 		pod.Annotations[k] = v
 	}
 
+	if pod.Spec.NodeSelector == nil {
+		pod.Spec.NodeSelector = make(map[string]string)
+	}
+
+	for k, v := range podTempl.NodeSelector {
+		pod.Spec.NodeSelector[k] = v
+	}
+
+	if pod.Spec.Tolerations == nil {
+		pod.Spec.Tolerations = []corev1.Toleration{}
+	}
+
+	for _, t := range podTempl.Tolerations {
+		pod.Spec.Tolerations = append(pod.Spec.Tolerations, t)
+	}
+
 	return pod
 }

pkg/issuer/acme/http/pod_test.go

@@ -21,7 +21,8 @@ import (
 	"reflect"
 	"testing"
 
-	"k8s.io/api/core/v1"
+	corev1 "k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/runtime"
@@ -278,6 +279,18 @@ func TestMergePodObjectMetaWithPodTemplate(t *testing.T) {
 											"foo":                     "bar",
 										},
 									},
+									PodSpec: corev1.PodSpec{
+										NodeSelector: map[string]string{
+											"node": "selector",
+										},
+										Tolerations: []corev1.Toleration{
+											{
+												Key:      "key",
+												Operator: "Exists",
+												Effect:   "NoSchedule",
+											},
+										},
+									},
 								},
 							},
 						},
@@ -296,6 +309,16 @@ func TestMergePodObjectMetaWithPodTemplate(t *testing.T) {
 					"sidecar.istio.io/inject": "true",
 					"foo":                     "bar",
 				}
+				resultingPod.Spec.NodeSelector = map[string]string{
+					"node": "selector",
+				}
+				resultingPod.Spec.Tolerations = []corev1.Toleration{
+					{
+						Key:      "key",
+						Operator: "Exists",
+						Effect:   "NoSchedule",
+					},
+				}
 				s.testResources[createdPodKey] = resultingPod
 
 				s.Builder.Sync()