Add aws_vpn_gateway_attachment resource. (#7870)

This commit adds VPN Gateway attachment resource, and also an initial tests and
documentation stubs.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>

builtin/providers/aws/provider.go

@@ -282,6 +282,7 @@ func Provider() terraform.ResourceProvider {
 			"aws_vpn_connection":                           resourceAwsVpnConnection(),
 			"aws_vpn_connection_route":                     resourceAwsVpnConnectionRoute(),
 			"aws_vpn_gateway":                              resourceAwsVpnGateway(),
+			"aws_vpn_gateway_attachment":                   resourceAwsVpnGatewayAttachment(),
 		},
 		ConfigureFunc: providerConfigure,
 	}

builtin/providers/aws/resource_aws_vpn_gateway.go

@@ -32,6 +32,7 @@ func resourceAwsVpnGateway() *schema.Resource {
 			"vpc_id": &schema.Schema{
 				Type:     schema.TypeString,
 				Optional: true,
+				Computed: true,
 			},
 
 			"tags": tagsSchema(),
@@ -80,17 +81,18 @@ func resourceAwsVpnGatewayRead(d *schema.ResourceData, meta interface{}) error {
 	}
 
 	vpnGateway := resp.VpnGateways[0]
-	if vpnGateway == nil {
+	if vpnGateway == nil || *vpnGateway.State == "deleted" {
 		// Seems we have lost our VPN gateway
 		d.SetId("")
 		return nil
 	}
 
-	if len(vpnGateway.VpcAttachments) == 0 || *vpnGateway.VpcAttachments[0].State == "detached" || *vpnGateway.VpcAttachments[0].State == "deleted" {
+	vpnAttachment := vpnGatewayGetAttachment(vpnGateway)
+	if len(vpnGateway.VpcAttachments) == 0 || *vpnAttachment.State == "detached" {
 		// Gateway exists but not attached to the VPC
 		d.Set("vpc_id", "")
 	} else {
-		d.Set("vpc_id", vpnGateway.VpcAttachments[0].VpcId)
+		d.Set("vpc_id", *vpnAttachment.VpcId)
 	}
 	d.Set("availability_zone", vpnGateway.AvailabilityZone)
 	d.Set("tags", tagsToMap(vpnGateway.Tags))
@@ -301,12 +303,21 @@ func vpnGatewayAttachStateRefreshFunc(conn *ec2.EC2, id string, expected string)
 		}
 
 		vpnGateway := resp.VpnGateways[0]
-
 		if len(vpnGateway.VpcAttachments) == 0 {
 			// No attachments, we're detached
 			return vpnGateway, "detached", nil
 		}
 
-		return vpnGateway, *vpnGateway.VpcAttachments[0].State, nil
+		vpnAttachment := vpnGatewayGetAttachment(vpnGateway)
+		return vpnGateway, *vpnAttachment.State, nil
 	}
 }
+
+func vpnGatewayGetAttachment(vgw *ec2.VpnGateway) *ec2.VpcAttachment {
+	for _, v := range vgw.VpcAttachments {
+		if *v.State == "attached" {
+			return v
+		}
+	}
+	return &ec2.VpcAttachment{State: aws.String("detached")}
+}

builtin/providers/aws/resource_aws_vpn_gateway_attachment.go

@@ -0,0 +1,210 @@
+package aws
+
+import (
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/awserr"
+	"github.com/aws/aws-sdk-go/service/ec2"
+	"github.com/hashicorp/terraform/helper/hashcode"
+	"github.com/hashicorp/terraform/helper/resource"
+	"github.com/hashicorp/terraform/helper/schema"
+)
+
+func resourceAwsVpnGatewayAttachment() *schema.Resource {
+	return &schema.Resource{
+		Create: resourceAwsVpnGatewayAttachmentCreate,
+		Read:   resourceAwsVpnGatewayAttachmentRead,
+		Delete: resourceAwsVpnGatewayAttachmentDelete,
+
+		Schema: map[string]*schema.Schema{
+			"vpc_id": &schema.Schema{
+				Type:     schema.TypeString,
+				Required: true,
+				ForceNew: true,
+			},
+			"vpn_gateway_id": &schema.Schema{
+				Type:     schema.TypeString,
+				Required: true,
+				ForceNew: true,
+			},
+		},
+	}
+}
+
+func resourceAwsVpnGatewayAttachmentCreate(d *schema.ResourceData, meta interface{}) error {
+	conn := meta.(*AWSClient).ec2conn
+
+	vpcId := d.Get("vpc_id").(string)
+	vgwId := d.Get("vpn_gateway_id").(string)
+
+	createOpts := &ec2.AttachVpnGatewayInput{
+		VpcId:        aws.String(vpcId),
+		VpnGatewayId: aws.String(vgwId),
+	}
+	log.Printf("[DEBUG] VPN Gateway attachment options: %#v", *createOpts)
+
+	_, err := conn.AttachVpnGateway(createOpts)
+	if err != nil {
+		return fmt.Errorf("Error attaching VPN Gateway %q to VPC %q: %s",
+			vgwId, vpcId, err)
+	}
+
+	d.SetId(vpnGatewayAttachmentId(vpcId, vgwId))
+	log.Printf("[INFO] VPN Gateway %q attachment ID: %s", vgwId, d.Id())
+
+	stateConf := &resource.StateChangeConf{
+		Pending:    []string{"detached", "attaching"},
+		Target:     []string{"attached"},
+		Refresh:    vpnGatewayAttachmentStateRefresh(conn, vpcId, vgwId),
+		Timeout:    5 * time.Minute,
+		Delay:      10 * time.Second,
+		MinTimeout: 3 * time.Second,
+	}
+
+	_, err = stateConf.WaitForState()
+	if err != nil {
+		return fmt.Errorf("Error waiting for VPN Gateway %q to attach to VPC %q: %s",
+			vgwId, vpcId, err)
+	}
+	log.Printf("[DEBUG] VPN Gateway %q attached to VPC %q.", vgwId, vpcId)
+
+	return resourceAwsVpnGatewayAttachmentRead(d, meta)
+}
+
+func resourceAwsVpnGatewayAttachmentRead(d *schema.ResourceData, meta interface{}) error {
+	conn := meta.(*AWSClient).ec2conn
+
+	vgwId := d.Get("vpn_gateway_id").(string)
+
+	resp, err := conn.DescribeVpnGateways(&ec2.DescribeVpnGatewaysInput{
+		VpnGatewayIds: []*string{aws.String(vgwId)},
+	})
+
+	if err != nil {
+		awsErr, ok := err.(awserr.Error)
+		if ok && awsErr.Code() == "InvalidVPNGatewayID.NotFound" {
+			log.Printf("[WARN] VPN Gateway %q not found.", vgwId)
+			d.SetId("")
+			return nil
+		}
+		return err
+	}
+
+	vgw := resp.VpnGateways[0]
+	if *vgw.State == "deleted" {
+		log.Printf("[INFO] VPN Gateway %q appears to have been deleted.", vgwId)
+		d.SetId("")
+		return nil
+	}
+
+	vga := vpnGatewayGetAttachment(vgw)
+	if len(vgw.VpcAttachments) == 0 || *vga.State == "detached" {
+		d.Set("vpc_id", "")
+		return nil
+	}
+
+	d.Set("vpc_id", *vga.VpcId)
+	return nil
+}
+
+func resourceAwsVpnGatewayAttachmentDelete(d *schema.ResourceData, meta interface{}) error {
+	conn := meta.(*AWSClient).ec2conn
+
+	vpcId := d.Get("vpc_id").(string)
+	vgwId := d.Get("vpn_gateway_id").(string)
+
+	if vpcId == "" {
+		log.Printf("[DEBUG] Not detaching VPN Gateway %q as no VPC ID is set.", vgwId)
+		return nil
+	}
+
+	_, err := conn.DetachVpnGateway(&ec2.DetachVpnGatewayInput{
+		VpcId:        aws.String(vpcId),
+		VpnGatewayId: aws.String(vgwId),
+	})
+
+	if err != nil {
+		awsErr, ok := err.(awserr.Error)
+		if ok {
+			switch awsErr.Code() {
+			case "InvalidVPNGatewayID.NotFound":
+				log.Printf("[WARN] VPN Gateway %q not found.", vgwId)
+				d.SetId("")
+				return nil
+			case "InvalidVpnGatewayAttachment.NotFound":
+				log.Printf(
+					"[WARN] VPN Gateway %q attachment to VPC %q not found.",
+					vgwId, vpcId)
+				d.SetId("")
+				return nil
+			}
+		}
+
+		return fmt.Errorf("Error detaching VPN Gateway %q from VPC %q: %s",
+			vgwId, vpcId, err)
+	}
+
+	stateConf := &resource.StateChangeConf{
+		Pending:    []string{"attached", "detaching"},
+		Target:     []string{"detached"},
+		Refresh:    vpnGatewayAttachmentStateRefresh(conn, vpcId, vgwId),
+		Timeout:    5 * time.Minute,
+		Delay:      10 * time.Second,
+		MinTimeout: 3 * time.Second,
+	}
+
+	_, err = stateConf.WaitForState()
+	if err != nil {
+		return fmt.Errorf("Error waiting for VPN Gateway %q to detach from VPC %q: %s",
+			vgwId, vpcId, err)
+	}
+	log.Printf("[DEBUG] VPN Gateway %q detached from VPC %q.", vgwId, vpcId)
+
+	d.SetId("")
+	return nil
+}
+
+func vpnGatewayAttachmentStateRefresh(conn *ec2.EC2, vpcId, vgwId string) resource.StateRefreshFunc {
+	return func() (interface{}, string, error) {
+		resp, err := conn.DescribeVpnGateways(&ec2.DescribeVpnGatewaysInput{
+			Filters: []*ec2.Filter{
+				&ec2.Filter{
+					Name:   aws.String("attachment.vpc-id"),
+					Values: []*string{aws.String(vpcId)},
+				},
+			},
+			VpnGatewayIds: []*string{aws.String(vgwId)},
+		})
+
+		if err != nil {
+			awsErr, ok := err.(awserr.Error)
+			if ok {
+				switch awsErr.Code() {
+				case "InvalidVPNGatewayID.NotFound":
+					fallthrough
+				case "InvalidVpnGatewayAttachment.NotFound":
+					return nil, "", nil
+				}
+			}
+
+			return nil, "", err
+		}
+
+		vgw := resp.VpnGateways[0]
+		if len(vgw.VpcAttachments) == 0 {
+			return vgw, "detached", nil
+		}
+
+		vga := vpnGatewayGetAttachment(vgw)
+
+		log.Printf("[DEBUG] VPN Gateway %q attachment status: %s", vgwId, *vga.State)
+		return vgw, *vga.State, nil
+	}
+}
+
+func vpnGatewayAttachmentId(vpcId, vgwId string) string {
+	return fmt.Sprintf("vpn-attachment-%x", hashcode.String(fmt.Sprintf("%s-%s", vpcId, vgwId)))
+}

builtin/providers/aws/resource_aws_vpn_gateway_attachment_test.go

@@ -0,0 +1,163 @@
+package aws
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/service/ec2"
+	"github.com/hashicorp/terraform/helper/resource"
+	"github.com/hashicorp/terraform/terraform"
+)
+
+func TestAccAWSVpnGatewayAttachment_basic(t *testing.T) {
+	var vpc ec2.Vpc
+	var vgw ec2.VpnGateway
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:      func() { testAccPreCheck(t) },
+		IDRefreshName: "aws_vpn_gateway_attachment.test",
+		Providers:     testAccProviders,
+		CheckDestroy:  testAccCheckVpnGatewayAttachmentDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: testAccVpnGatewayAttachmentConfig,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckVpcExists(
+						"aws_vpc.test",
+						&vpc),
+					testAccCheckVpnGatewayExists(
+						"aws_vpn_gateway.test",
+						&vgw),
+					testAccCheckVpnGatewayAttachmentExists(
+						"aws_vpn_gateway_attachment.test",
+						&vpc, &vgw),
+				),
+			},
+		},
+	})
+}
+
+func TestAccAWSVpnGatewayAttachment_deleted(t *testing.T) {
+	var vpc ec2.Vpc
+	var vgw ec2.VpnGateway
+
+	testDeleted := func(n string) resource.TestCheckFunc {
+		return func(s *terraform.State) error {
+			_, ok := s.RootModule().Resources[n]
+			if ok {
+				return fmt.Errorf("Expected VPN Gateway attachment resource %q to be deleted.", n)
+			}
+			return nil
+		}
+	}
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:      func() { testAccPreCheck(t) },
+		IDRefreshName: "aws_vpn_gateway_attachment.test",
+		Providers:     testAccProviders,
+		CheckDestroy:  testAccCheckVpnGatewayAttachmentDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: testAccVpnGatewayAttachmentConfig,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckVpcExists(
+						"aws_vpc.test",
+						&vpc),
+					testAccCheckVpnGatewayExists(
+						"aws_vpn_gateway.test",
+						&vgw),
+					testAccCheckVpnGatewayAttachmentExists(
+						"aws_vpn_gateway_attachment.test",
+						&vpc, &vgw),
+				),
+			},
+			resource.TestStep{
+				Config: testAccNoVpnGatewayAttachmentConfig,
+				Check: resource.ComposeTestCheckFunc(
+					testDeleted("aws_vpn_gateway_attachment.test"),
+				),
+			},
+		},
+	})
+}
+
+func testAccCheckVpnGatewayAttachmentExists(n string, vpc *ec2.Vpc, vgw *ec2.VpnGateway) resource.TestCheckFunc {
+	return func(s *terraform.State) error {
+		rs, ok := s.RootModule().Resources[n]
+		if !ok {
+			return fmt.Errorf("Not found: %s", n)
+		}
+
+		if rs.Primary.ID == "" {
+			return fmt.Errorf("No ID is set")
+		}
+
+		vpcId := rs.Primary.Attributes["vpc_id"]
+		vgwId := rs.Primary.Attributes["vpn_gateway_id"]
+
+		if len(vgw.VpcAttachments) == 0 {
+			return fmt.Errorf("VPN Gateway %q has no attachments.", vgwId)
+		}
+
+		if *vgw.VpcAttachments[0].State != "attached" {
+			return fmt.Errorf("Expected VPN Gateway %q to be in attached state, but got: %q",
+				vgwId, *vgw.VpcAttachments[0].State)
+		}
+
+		if *vgw.VpcAttachments[0].VpcId != *vpc.VpcId {
+			return fmt.Errorf("Expected VPN Gateway %q to be attached to VPC %q, but got: %q",
+				vgwId, vpcId, *vgw.VpcAttachments[0].VpcId)
+		}
+
+		return nil
+	}
+}
+
+func testAccCheckVpnGatewayAttachmentDestroy(s *terraform.State) error {
+	conn := testAccProvider.Meta().(*AWSClient).ec2conn
+
+	for _, rs := range s.RootModule().Resources {
+		if rs.Type != "aws_vpn_gateway_attachment" {
+			continue
+		}
+
+		vgwId := rs.Primary.Attributes["vpn_gateway_id"]
+
+		resp, err := conn.DescribeVpnGateways(&ec2.DescribeVpnGatewaysInput{
+			VpnGatewayIds: []*string{aws.String(vgwId)},
+		})
+		if err != nil {
+			return err
+		}
+
+		vgw := resp.VpnGateways[0]
+		if *vgw.VpcAttachments[0].State != "detached" {
+			return fmt.Errorf("Expected VPN Gateway %q to be in detached state, but got: %q",
+				vgwId, *vgw.VpcAttachments[0].State)
+		}
+	}
+
+	return nil
+}
+
+const testAccNoVpnGatewayAttachmentConfig = `
+resource "aws_vpc" "test" {
+	cidr_block = "10.0.0.0/16"
+}
+
+resource "aws_vpn_gateway" "test" { }
+`
+
+const testAccVpnGatewayAttachmentConfig = `
+resource "aws_vpc" "test" {
+	cidr_block = "10.0.0.0/16"
+}
+
+resource "aws_vpn_gateway" "test" { }
+
+resource "aws_vpn_gateway_attachment" "test" {
+	vpc_id = "${aws_vpc.test.id}"
+	vpn_gateway_id = "${aws_vpn_gateway.test.id}"
+}
+`

builtin/providers/aws/resource_aws_vpn_gateway_test.go

@@ -16,10 +16,10 @@ func TestAccAWSVpnGateway_basic(t *testing.T) {
 
 	testNotEqual := func(*terraform.State) error {
 		if len(v.VpcAttachments) == 0 {
-			return fmt.Errorf("VPN gateway A is not attached")
+			return fmt.Errorf("VPN Gateway A is not attached")
 		}
 		if len(v2.VpcAttachments) == 0 {
-			return fmt.Errorf("VPN gateway B is not attached")
+			return fmt.Errorf("VPN Gateway B is not attached")
 		}
 
 		id1 := v.VpcAttachments[0].VpcId
@@ -58,20 +58,38 @@ func TestAccAWSVpnGateway_basic(t *testing.T) {
 }
 
 func TestAccAWSVpnGateway_reattach(t *testing.T) {
-	var v ec2.VpnGateway
+	var vpc1, vpc2 ec2.Vpc
+	var vgw1, vgw2 ec2.VpnGateway
 
-	genTestStateFunc := func(expectedState string) func(*terraform.State) error {
+	testAttachmentFunc := func(vgw *ec2.VpnGateway, vpc *ec2.Vpc) func(*terraform.State) error {
 		return func(*terraform.State) error {
-			if len(v.VpcAttachments) == 0 {
-				if expectedState != "detached" {
-					return fmt.Errorf("VPN gateway has no VPC attachments")
+			if len(vgw.VpcAttachments) == 0 {
+				return fmt.Errorf("VPN Gateway %q has no VPC attachments.",
+					*vgw.VpnGatewayId)
 			}
-			} else if len(v.VpcAttachments) == 1 {
-				if *v.VpcAttachments[0].State != expectedState {
-					return fmt.Errorf("Expected VPC gateway VPC attachment to be in '%s' state, but was not: %s", expectedState, v)
+
+			if len(vgw.VpcAttachments) > 1 {
+				count := 0
+				for _, v := range vgw.VpcAttachments {
+					if *v.State == "attached" {
+						count += 1
 					}
-			} else {
-				return fmt.Errorf("VPN gateway has unexpected number of VPC attachments(more than 1): %s", v)
+				}
+				if count > 1 {
+					return fmt.Errorf(
+						"VPN Gateway %q has an unexpected number of VPC attachments (more than 1): %#v",
+						*vgw.VpnGatewayId, vgw.VpcAttachments)
+				}
+			}
+
+			if *vgw.VpcAttachments[0].State != "attached" {
+				return fmt.Errorf("Expected VPN Gateway %q to be attached.",
+					*vgw.VpnGatewayId)
+			}
+
+			if *vgw.VpcAttachments[0].VpcId != *vpc.VpcId {
+				return fmt.Errorf("Expected VPN Gateway %q to be attached to VPC %q, but got: %q",
+					*vgw.VpnGatewayId, *vpc.VpcId, *vgw.VpcAttachments[0].VpcId)
 			}
 			return nil
 		}
@@ -84,27 +102,38 @@ func TestAccAWSVpnGateway_reattach(t *testing.T) {
 		CheckDestroy:  testAccCheckVpnGatewayDestroy,
 		Steps: []resource.TestStep{
 			resource.TestStep{
-				Config: testAccVpnGatewayConfig,
+				Config: testAccCheckVpnGatewayConfigReattach,
 				Check: resource.ComposeTestCheckFunc(
+					testAccCheckVpcExists("aws_vpc.foo", &vpc1),
+					testAccCheckVpcExists("aws_vpc.bar", &vpc2),
 					testAccCheckVpnGatewayExists(
-						"aws_vpn_gateway.foo", &v),
-					genTestStateFunc("attached"),
+						"aws_vpn_gateway.foo", &vgw1),
+					testAccCheckVpnGatewayExists(
+						"aws_vpn_gateway.bar", &vgw2),
+					testAttachmentFunc(&vgw1, &vpc1),
+					testAttachmentFunc(&vgw2, &vpc2),
 				),
 			},
 			resource.TestStep{
-				Config: testAccVpnGatewayConfigDetach,
+				Config: testAccCheckVpnGatewayConfigReattachChange,
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckVpnGatewayExists(
-						"aws_vpn_gateway.foo", &v),
-					genTestStateFunc("detached"),
+						"aws_vpn_gateway.foo", &vgw1),
+					testAccCheckVpnGatewayExists(
+						"aws_vpn_gateway.bar", &vgw2),
+					testAttachmentFunc(&vgw2, &vpc1),
+					testAttachmentFunc(&vgw1, &vpc2),
 				),
 			},
 			resource.TestStep{
-				Config: testAccVpnGatewayConfig,
+				Config: testAccCheckVpnGatewayConfigReattach,
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckVpnGatewayExists(
-						"aws_vpn_gateway.foo", &v),
-					genTestStateFunc("attached"),
+						"aws_vpn_gateway.foo", &vgw1),
+					testAccCheckVpnGatewayExists(
+						"aws_vpn_gateway.bar", &vgw2),
+					testAttachmentFunc(&vgw1, &vpc1),
+					testAttachmentFunc(&vgw2, &vpc2),
 				),
 			},
 		},
@@ -118,7 +147,7 @@ func TestAccAWSVpnGateway_delete(t *testing.T) {
 		return func(s *terraform.State) error {
 			_, ok := s.RootModule().Resources[r]
 			if ok {
-				return fmt.Errorf("VPN Gateway %q should have been deleted", r)
+				return fmt.Errorf("VPN Gateway %q should have been deleted.", r)
 			}
 			return nil
 		}
@@ -159,7 +188,6 @@ func TestAccAWSVpnGateway_tags(t *testing.T) {
 					testAccCheckTags(&v.Tags, "foo", "bar"),
 				),
 			},
-
 			resource.TestStep{
 				Config: testAccCheckVpnGatewayConfigTagsUpdate,
 				Check: resource.ComposeTestCheckFunc(
@@ -198,7 +226,7 @@ func testAccCheckVpnGatewayDestroy(s *terraform.State) error {
 			}
 
 			if *v.State != "deleted" {
-				return fmt.Errorf("Expected VpnGateway to be in deleted state, but was not: %s", v)
+				return fmt.Errorf("Expected VPN Gateway to be in deleted state, but was not: %s", v)
 			}
 			return nil
 		}
@@ -235,7 +263,7 @@ func testAccCheckVpnGatewayExists(n string, ig *ec2.VpnGateway) resource.TestChe
 			return err
 		}
 		if len(resp.VpnGateways) == 0 {
-			return fmt.Errorf("VPNGateway not found")
+			return fmt.Errorf("VPN Gateway not found")
 		}
 
 		*ig = *resp.VpnGateways[0]
@@ -270,16 +298,6 @@ resource "aws_vpn_gateway" "foo" {
 }
 `
 
-const testAccVpnGatewayConfigDetach = `
-resource "aws_vpc" "foo" {
-	cidr_block = "10.1.0.0/16"
-}
-
-resource "aws_vpn_gateway" "foo" {
-	vpc_id = ""
-}
-`
-
 const testAccCheckVpnGatewayConfigTags = `
 resource "aws_vpc" "foo" {
 	cidr_block = "10.1.0.0/16"
@@ -305,3 +323,39 @@ resource "aws_vpn_gateway" "foo" {
 	}
 }
 `
+
+const testAccCheckVpnGatewayConfigReattach = `
+resource "aws_vpc" "foo" {
+	cidr_block = "10.1.0.0/16"
+}
+
+resource "aws_vpc" "bar" {
+	cidr_block = "10.2.0.0/16"
+}
+
+resource "aws_vpn_gateway" "foo" {
+	vpc_id = "${aws_vpc.foo.id}"
+}
+
+resource "aws_vpn_gateway" "bar" {
+	vpc_id = "${aws_vpc.bar.id}"
+}
+`
+
+const testAccCheckVpnGatewayConfigReattachChange = `
+resource "aws_vpc" "foo" {
+	cidr_block = "10.1.0.0/16"
+}
+
+resource "aws_vpc" "bar" {
+	cidr_block = "10.2.0.0/16"
+}
+
+resource "aws_vpn_gateway" "foo" {
+	vpc_id = "${aws_vpc.bar.id}"
+}
+
+resource "aws_vpn_gateway" "bar" {
+	vpc_id = "${aws_vpc.foo.id}"
+}
+`

website/source/docs/providers/aws/r/vpn_gateway_attachment.html.markdown

@@ -0,0 +1,57 @@
+---
+layout: "aws"
+page_title: "AWS: aws_vpn_gateway_attachment"
+sidebar_current: "docs-aws-resource-vpn-gateway-attachment"
+description: |-
+  Provides a Virtual Private Gateway attachment resource.
+---
+
+# aws\_vpn\_gateway\_attachment
+
+Provides a Virtual Private Gateway attachment resource, allowing for an existing
+hardware VPN gateway to be attached and/or detached from a VPC.
+
+-> **Note:** The [`aws_vpn_gateway`](vpn_gateway.html)
+resource can also automatically attach the Virtual Private Gateway it creates
+to an existing VPC by setting the [`vpc_id`](vpn_gateway.html#vpc_id) attribute accordingly.
+
+## Example Usage
+
+```
+resource "aws_vpc" "network" {
+  cidr_block = "10.0.0.0/16"
+}
+
+resource "aws_vpn_gateway" "vpn" {
+  tags {
+    Name = "example-vpn-gateway"
+  }
+}
+
+resource "aws_vpn_gateway_attachment" "vpn_attachment" {
+  vpc_id = "${aws_vpc.network.id}"
+  vpn_gateway_id = "${aws_vpn_gateway.vpn.id}"
+}
+```
+
+See [Virtual Private Cloud](http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Introduction.html)
+and [Virtual Private Gateway](http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_VPN.html) user
+guides for more information.
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `vpc_id` - (Required) The ID of the VPC.
+* `vpn_gateway_id` - (Required) The ID of the Virtual Private Gateway.
+
+## Attributes Reference
+
+The following attributes are exported:
+
+* `vpc_id` - The ID of the VPC that Virtual Private Gateway is attached to.
+* `vpn_gateway_id` - The ID of the Virtual Private Gateway.
+
+## Import
+
+This resource does not support importing.

website/source/layouts/aws.erb

@@ -885,6 +885,10 @@
                             <a href="/docs/providers/aws/r/vpn_gateway.html">aws_vpn_gateway</a>
                         </li>
 
+                        <li<%= sidebar_current("docs-aws-resource-vpn-gateway-attachment") %>>
+                            <a href="/docs/providers/aws/r/vpn_gateway_attachment.html">aws_vpn_gateway_attachment</a>
+                        </li>
+
                     </ul>
                 </li>