Network: add mtu setting

libvirt/resource_libvirt_network.go

@@ -69,6 +69,11 @@ func resourceLibvirtNetwork() *schema.Resource {
 				Computed: true,
 				ForceNew: true,
 			},
+			"mtu": {
+				Type:     schema.TypeInt,
+				Optional: true,
+				Required: false,
+			},
 			"addresses": {
 				Type:     schema.TypeList,
 				Optional: true,
@@ -320,6 +325,10 @@ func resourceLibvirtNetworkCreate(d *schema.ResourceData, meta interface{}) erro
 		STP:  "on",
 	}
 
+	if mtu, ok := d.GetOk("mtu"); ok {
+		networkDef.MTU = &libvirtxml.NetworkMTU{Size: uint(mtu.(int))}
+	}
+
 	// check the network mode
 	networkDef.Forward = &libvirtxml.NetworkForward{
 		Mode: strings.ToLower(d.Get("mode").(string)),
@@ -530,6 +539,10 @@ func resourceLibvirtNetworkRead(d *schema.ResourceData, meta interface{}) error
 	d.Set("name", networkDef.Name)
 	d.Set("bridge", networkDef.Bridge.Name)
 
+	if networkDef.MTU != nil {
+		d.Set("mtu", networkDef.MTU.Size)
+	}
+
 	// Domain as won't be present for bridged networks
 	if networkDef.Domain != nil {
 		d.Set("domain", networkDef.Domain.Name)

libvirt/resource_libvirt_network_test.go

@@ -551,3 +551,31 @@ func testAccCheckLibvirtNetworkDestroy(s *terraform.State) error {
 	}
 	return nil
 }
+
+func TestAccLibvirtNetwork_MTU(t *testing.T) {
+	var network libvirt.Network
+	randomNetworkResource := acctest.RandString(10)
+	randomNetworkName := acctest.RandString(10)
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckLibvirtNetworkDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: fmt.Sprintf(`
+				resource "libvirt_network" "%s" {
+					name      = "%s"
+					mode      = "nat"
+					domain    = "k8s.local"
+					addresses = ["10.17.3.0/24"]
+					autostart = true
+					mtu = 9999
+				}`, randomNetworkResource, randomNetworkName),
+				Check: resource.ComposeTestCheckFunc(
+					networkExists("libvirt_network."+randomNetworkResource, &network),
+					resource.TestCheckResourceAttr("libvirt_network."+randomNetworkResource, "mtu", "9999"),
+				),
+			},
+		},
+	})
+}

website/docs/r/network.markdown

@@ -34,6 +34,10 @@ resource "libvirt_network" "kube_network" {
   # (only necessary in "bridge" mode)
   # bridge = "br7"
 
+  # (optional) the MTU for the network. If not supplied, the underlying device's
+  # default is used (usually 1500)
+  # mtu = 9000
+
   # (Optional) DNS configuration
   dns {
     # (Optional, default false)
@@ -102,6 +106,8 @@ The following arguments are supported:
 * `bridge` - (Optional) The bridge device defines the name of a bridge
    device which will be used to construct the virtual network (when not provided,
    it will be automatically obtained by libvirt in `none`, `nat` and `route` modes).
+* `mtu` - (Optional) The MTU to set for the underlying network interfaces. When
+   not supplied, libvirt will use the default for the interface, usually 1500.
 * `autostart` - (Optional) Set to `true` to start the network on host boot up.
   If not specified `false` is assumed.
 * `dns` - (Optional) configuration of DNS specific settings for the network