[Terraform] Add support for dns_cache_config to resource_container_cluster

.changelog/3126.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+container: added `dns_cache_config` field to `google_container_cluster` resource
+```

google-beta/resource_container_cluster.go

@@ -55,6 +55,7 @@ var (
 		"addons_config.0.network_policy_config",
 		"addons_config.0.istio_config",
 		"addons_config.0.cloudrun_config",
+		"addons_config.0.dns_cache_config",
 	}
 )
 
@@ -278,6 +279,22 @@ func resourceContainerCluster() *schema.Resource {
 								},
 							},
 						},
+						"dns_cache_config": {
+							Type:         schema.TypeList,
+							Optional:     true,
+							Computed:     true,
+							AtLeastOneOf: addonsConfigKeys,
+							ForceNew:     true,
+							MaxItems:     1,
+							Elem: &schema.Resource{
+								Schema: map[string]*schema.Schema{
+									"enabled": {
+										Type:     schema.TypeBool,
+										Required: true,
+									},
+								},
+							},
+						},
 					},
 				},
 			},
@@ -2166,6 +2183,14 @@ func expandClusterAddonsConfig(configured interface{}) *containerBeta.AddonsConf
 		}
 	}
 
+	if v, ok := config["dns_cache_config"]; ok && len(v.([]interface{})) > 0 {
+		addon := v.([]interface{})[0].(map[string]interface{})
+		ac.DnsCacheConfig = &containerBeta.DnsCacheConfig{
+			Enabled:         addon["enabled"].(bool),
+			ForceSendFields: []string{"Enabled"},
+		}
+	}
+
 	return ac
 }
 
@@ -2560,6 +2585,14 @@ func flattenClusterAddonsConfig(c *containerBeta.AddonsConfig) []map[string]inte
 			},
 		}
 	}
+
+	if c.DnsCacheConfig != nil {
+		result["dns_cache_config"] = []map[string]interface{}{
+			{
+				"enabled": c.DnsCacheConfig.Enabled,
+			},
+		}
+	}
 	return []map[string]interface{}{result}
 }
 

google-beta/resource_container_cluster_test.go

@@ -144,17 +144,19 @@ func TestAccContainerCluster_withAddons(t *testing.T) {
 				Config: testAccContainerCluster_withAddons(clusterName),
 			},
 			{
-				ResourceName:      "google_container_cluster.primary",
-				ImportState:       true,
-				ImportStateVerify: true,
+				ResourceName:            "google_container_cluster.primary",
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"min_master_version"},
 			},
 			{
 				Config: testAccContainerCluster_updateAddons(clusterName),
 			},
 			{
-				ResourceName:      "google_container_cluster.primary",
-				ImportState:       true,
-				ImportStateVerify: true,
+				ResourceName:            "google_container_cluster.primary",
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"min_master_version"},
 			},
 		},
 	})
@@ -1937,6 +1939,8 @@ resource "google_container_cluster" "primary" {
   location           = "us-central1-a"
   initial_node_count = 1
 
+  min_master_version = "latest"
+
   addons_config {
     http_load_balancing {
       disabled = true
@@ -1954,6 +1958,9 @@ resource "google_container_cluster" "primary" {
     cloudrun_config {
       disabled = true
     }
+    dns_cache_config {
+      enabled = false
+    }
   }
 }
 `, clusterName)
@@ -1966,6 +1973,8 @@ resource "google_container_cluster" "primary" {
   location           = "us-central1-a"
   initial_node_count = 1
 
+  min_master_version = "latest"
+
   addons_config {
     http_load_balancing {
       disabled = false
@@ -1983,6 +1992,9 @@ resource "google_container_cluster" "primary" {
     cloudrun_config {
       disabled = false
     }
+    dns_cache_config {
+      enabled = true
+    }
   }
 }
 `, clusterName)

website/docs/r/container_cluster.html.markdown

@@ -324,6 +324,13 @@ The `addons_config` block supports:
 * `cloudrun_config` - (Optional, [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html)).
     The status of the CloudRun addon. It requires `istio_config` enabled. It is disabled by default.
     Set `disabled = false` to enable. This addon can only be enabled at cluster creation time.
+
+* `dns_cache_config` - (Optional, [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html)).
+    The status of the NodeLocal DNSCache addon. It is disabled by default.
+    Set `enabled = true` to enable. 
+
+    **Enabling/Disabling NodeLocal DNSCache in an existing cluster is a disruptive operation.
+    All cluster nodes running GKE 1.15 and higher are recreated.**
 
 This example `addons_config` disables two addons: