AWS::AppMesh::VirtualNode - AWS CloudFormation
SyntaxPropertiesReturn valuesExamplesSee also

AWS::AppMesh::VirtualNode

Creates a virtual node within a service mesh.

A virtual node acts as a logical pointer to a particular task group, such as an Amazon ECS service or a Kubernetes deployment. When you create a virtual node, you can specify the service discovery information for your task group, and whether the proxy running in a task group will communicate with other proxies using Transport Layer Security (TLS).

You define a listener for any inbound traffic that your virtual node expects. Any virtual service that your virtual node expects to communicate to is specified as a backend.

The response metadata for your new virtual node contains the arn that is associated with the virtual node. Set this value to the full ARN; for example, arn:aws:appmesh:us-west-2:123456789012:myMesh/default/virtualNode/myApp) as the APPMESH_RESOURCE_ARN environment variable for your task group's Envoy proxy container in your task definition or pod spec. This is then mapped to the node.id and node.cluster Envoy parameters.

Note

By default, App Mesh uses the name of the resource you specified in APPMESH_RESOURCE_ARN when Envoy is referring to itself in metrics and traces. You can override this behavior by setting the APPMESH_RESOURCE_CLUSTER environment variable with your own name.

For more information about virtual nodes, see Virtual nodes. You must be using 1.15.0 or later of the Envoy image when setting these variables. For more information aboutApp Mesh Envoy variables, see Envoy image in the AWS App Mesh User Guide.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{
  "Type" : "AWS::AppMesh::VirtualNode",
  "Properties" : {
      "MeshName" : String,
      "MeshOwner" : String,
      "Spec" : VirtualNodeSpec,
      "Tags" : [ Tag, ... ],
      "VirtualNodeName" : String
    }
}

YAML

Type: AWS::AppMesh::VirtualNode
Properties:
  MeshName: String
  MeshOwner: String
  Spec: 
    VirtualNodeSpec
  Tags: 
    - Tag
  VirtualNodeName: String

Properties

MeshName

The name of the service mesh to create the virtual node in.

Required: Yes

Type: String

Minimum: 1

Maximum: 255

Update requires: Replacement

MeshOwner

The AWS IAM account ID of the service mesh owner. If the account ID is not your own, then the account that you specify must share the mesh with your account before you can create the resource in the service mesh. For more information about mesh sharing, see Working with shared meshes.

Required: No

Type: String

Minimum: 12

Maximum: 12

Update requires: Replacement

Spec

The virtual node specification to apply.

Required: Yes

Type: VirtualNodeSpec

Update requires: No interruption

Tags

Optional metadata that you can apply to the virtual node to assist with categorization and organization. Each tag consists of a key and an optional value, both of which you define. Tag keys can have a maximum character length of 128 characters, and tag values can have a maximum length of 256 characters.

Required: No

Type: Array of Tag

Minimum: 0

Maximum: 50

Update requires: No interruption

VirtualNodeName

The name to use for the virtual node.

Required: No

Type: String

Minimum: 1

Maximum: 255

Update requires: Replacement

Return values

Ref

When you pass the logical ID of this resource to the intrinsic Ref function, Ref returns the resource ARN. For example:

{ "Ref": "myVirtualNode" }

When you pass the logical ID of an AWS::AppMesh::VirtualNode resource to the intrinsic Ref function, the function returns the virtual node ARN, such as arn:aws:appmesh:us-east-1:555555555555:virtualNode/myVirtualNode .

For more information about using the Ref function, see Ref.

Fn::GetAtt

The Fn::GetAtt intrinsic function returns a value for a specified attribute of this type. The following are the available attributes and sample return values.

For more information about using the Fn::GetAtt intrinsic function, see Fn::GetAtt.

Arn

The full Amazon Resource Name (ARN) for the virtual node.

MeshName

The name of the service mesh that the virtual node resides in.

MeshOwner

The AWS IAM account ID of the service mesh owner. If the account ID is not your own, then it's the ID of the account that shared the mesh with your account. For more information about mesh sharing, see Working with Shared Meshes.

ResourceOwner

The AWS IAM account ID of the resource owner. If the account ID is not your own, then it's the ID of the mesh owner or of another account that the mesh is shared with. For more information about mesh sharing, see Working with Shared Meshes.

Uid

The unique identifier for the virtual node.

VirtualNodeName

The name of the virtual node.

Examples

Create a Virtual Node

This example creates a virtual node with two backends and a listener with a health check policy. It also sends access logs to a file path and uses DNS service discovery.

JSON

{
   "Description": "Basic Test Virtual Node",
   "Resources": {
      "BasicVirtualNode": {
         "Type": "AWS::AppMesh::VirtualNode",
         "Properties": {
            "VirtualNodeName": "TestVirtualNode",
            "MeshName": null,
            "Spec": {
               "Backends": [
                  {
                     "VirtualService": {
                        "VirtualServiceName": "Backend_1"
                     }
                  },
                  {
                     "VirtualService": {
                        "VirtualServiceName": "Backend_2"
                     }
                  }
               ],
               "Listeners": [
                  {
                     "HealthCheck": {
                        "HealthyThreshold": 2,
                        "IntervalMillis": 5000,
                        "Path": "Path",
                        "Port": 8080,
                        "Protocol": "http",
                        "TimeoutMillis": 2000,
                        "UnhealthyThreshold": 2
                     },
                     "PortMapping": {
                        "Port": 8080,
                        "Protocol": "http"
                     }
                  }
               ],
               "ServiceDiscovery": {
                  "DNS": {
                     "Hostname": "Hostname"
                  }
               },
               "Logging": {
                  "AccessLog": {
                     "File": {
                        "Path": "Path"
                     }
                  }
               }
            },
            "Tags": [
               {
                  "Key": "Key1",
                  "Value": "Value1"
               },
               {
                  "Key": "Key2",
                  "Value": "Value2"
               }
            ]
         }
      }
   },
   "Outputs": {
      "VirtualNodeName": {
         "Description": "Name of the VirtualNode",
         "Value": {
            "Fn::GetAtt": [
               "BasicVirtualNode",
               "VirtualNodeName"
            ]
         }
      },
      "MeshName": {
         "Description": "Name of the Mesh",
         "Value": {
            "Fn::GetAtt": [
               "BasicVirtualNode",
               "MeshName"
            ]
         }
      },
      "Arn": {
         "Description": "Arn of the VirtualNode created",
         "Value": {
            "Fn::GetAtt": [
               "BasicVirtualNode",
               "Arn"
            ]
         }
      },
      "Uid": {
         "Description": "Uid of the VirtualNode created",
         "Value": {
            "Fn::GetAtt": [
               "BasicVirtualNode",
               "Uid"
            ]
         }
      }
   }
}

YAML

Description: "Basic Test Virtual Node"
Resources:
  BasicVirtualNode:
    Type: "AWS::AppMesh::VirtualNode"
    Properties:
      VirtualNodeName: "TestVirtualNode"
      MeshName: !ImportValue TestMeshName
      Spec:
        Backends:
        - VirtualService:
            VirtualServiceName: "Backend_1"
        - VirtualService:
            VirtualServiceName: "Backend_2"
        Listeners:
        - HealthCheck:
            HealthyThreshold: 2
            IntervalMillis: 5000
            Path: "Path"
            Port: 8080
            Protocol: "http"
            TimeoutMillis: 2000
            UnhealthyThreshold: 2
          PortMapping:
            Port: 8080
            Protocol: "http"
        ServiceDiscovery:
          DNS:
            Hostname: "Hostname"
        Logging:
          AccessLog:
            File:
              Path: "Path"
      Tags:
      - Key: "Key1"
        Value: "Value1"
      - Key: "Key2"
        Value: "Value2"

Outputs:
  VirtualNodeName:
    Description: Name of the VirtualNode
    Value:
      Fn::GetAtt:
      - BasicVirtualNode
      - VirtualNodeName
  MeshName:
    Description: Name of the Mesh
    Value:
      Fn::GetAtt:
      - BasicVirtualNode
      - MeshName
  Arn:
    Description: Arn of the VirtualNode created
    Value:
      Fn::GetAtt:
      - BasicVirtualNode
      - Arn
  Uid:
    Description: Uid of the VirtualNode created
    Value:
      Fn::GetAtt:
      - BasicVirtualNode
      - Uid

See also