IPv4/IPv6 Dual-Stack Networking

This topic explains how to configure Tanzu Kubernetes Grid management and workload clusters to use dual-stack IPv4/IPv6 networking for load balancing, ingress control, Node IPAM, control plane endpoint, and other networking applications.

Setting the Primary IP Family

When you configure dual-stack neworking for a cluster, you set TKG_IP_FAMILY in its configuration file to either "IPv4,IPv6" or "IPv6,IPv4".

The first item in this pair determines the primary IP family for the cluster, which sets the IP address format for certain core services, for example:

  • The Kubernetes API
  • The external control plane endpoint address by which external clients communicate with the Kubernetes API
  • The default for single-stack services that are created when no IP family is specified

Prerequisites and Limitations

  • Before implementing IPv4/IPv6 networking, configure vCenter Server to support both IPv4 and IPv6 connectivity. For information, see Configure vSphere for IPv6 in the vSphere 8 documentation.
  • You can configure dual-stack networking on clusters with Ubuntu or Photon OS nodes.
  • You cannot deploy a dual-stack management cluster with the installer interface.
  • LoadBalancer services provided by NSX Advanced Load Balancer or Kube-VIP do not support dual-stack access. It might be possible with other providers.
  • You can use NSX ALB or Kube-VIP as the control plane endpoint provider for a dual-stack cluster.
  • Only the core add-on components, such as Antrea, Calico, CSI, CPI, and Pinniped, have been validated for dual-stack support in this release.

Configure Node IPAM with Dual-Stack Networking

To configure a cluster for Node IPAM with dual-stack networking, you need pools of available IP addresses with a gateway address for both IPv4 and IPv6.

In the cluster configuration file, you set NODE_IP_POOL_* or MANAGEMENT_NODE_IP_POOL_* variables to values that apply to the cluster’s primary IP family, which depends on its TKG_IP_FAMILY configuration setting, as described in Setting the Primary IP Family.

For the other IP pool, you set additional variables that are identical to the ones that you set for the primary IP pool, but with SECONDARY_ added. for example:

  • Workload clusters:

    • NODE_IPAM_SECONDARY_IP_POOL_APIVERSION: "ipam.cluster.x-k8s.io/v1alpha2"
    • NODE_IPAM_SECONDARY_IP_POOL_KIND: "InClusterIPPool"
    • NODE_IPAM_SECONDARY_IP_POOL_NAME: ""

  • Standalone management clusters:

    • MANAGEMENT_NODE_IPAM_SECONDARY_IP_POOL_GATEWAY: ""
    • MANAGEMENT_NODE_IPAM_SECONDARY_IP_POOL_ADDRESSES: []
    • MANAGEMENT_NODE_IPAM_SECONDARY_IP_POOL_SUBNET_PREFIX: ""

Create Dual-Stack Clusters with Kube-VIP

You can use Kube-VIP as the control plane endpoint provider for a dual-stack cluster.

To configure dual-stack on the clusters, Deploy Management Clusters or Create Workload Clusters, as required.

In the cluster configuration file:

  • Set the IP family configuration variable TKG_IP_FAMILY: ipv4,ipv6.
  • Optionally, set the service CIDRs and cluster CIDRs.
Note

There are two CIDRs for each variable. The IP families of these CIDRs follow the order of the configured TKG_IP_FAMILY. The largest CIDR range that is permitted for the IPv4 addresses is /12, and the largest IPv6 SERVICE_CIDR range is /108. If you do not set the CIDRs, the default values are used.

The services, which have an ipFamilyPolicy specified in their specs of PreferDualStack or RequireDualStack, can now be accessed through IPv4 or IPv6.

Note

The end-to-end tests for the dual-stack feature in upstream Kubernetes can fail as a cluster node advertises only its primary IP address (in this case, the IPv4 address) as its IP address.

Create Dual-Stack Clusters with NSX Advanced Load Balancer as Cluster Load Balancer Service Provider

NSX ALB can serve as the external load balancer provider for workload clusters with dual-stack networking in a Tanzu Kubernetes Grid deployment. You set the primary IP family to use in the AKO configuration. The IP type of the data network CIDR determines the IP type of the load balancer service frontend VIP. The AKO ipFamily setting determines the IP type of the backend pool of the NSX ALB service.

NSX Advanced Load Balancer Dual-Stack

For general information about how to use NSX ALB as the cluster load balancer service provider, see NSX Advanced Load Balancer as Cluster Load Balancer Service Provider.

To implement dual-stack clusters, you modify the AKODeploymentConfig file for those clusters. For information about how to access the AKODeploymentConfig for a cluster, see View the AKODeploymentConfig CR Object for a Cluster.

Supported Configurations

The NSX ALB load balancer service in a Tanzu Kubernetes Grid deployment supports the dual-stack configurations shown in the table below.

Cluster IpFamily AKO IpFamily Frontend VIP IpFamily Supported?
IPv4,IPv6 V4 V4 ✔
IPv4,IPv6 V6 V4 ✔
IPv4,IPv6 V4 V6 ✖
IPv4,IPv6 V6 V6 ✖
IPv6,IPv4 V4 V4 ✖
IPv6,IPv4 V6 V4 ✖
IPv6,IPv4 V4 V6 ✖
IPv6,IPv4 V6 V6 ✖

Known Limitations

The following limitations apply when using dual-stack networking in workload clusters with TKG v2.5.

  1. AKO does not support dual-stack for service type LoadBalancer. The LoadBalancer service has a single VIP.
  2. NSX ALB does not support creating an IPv6 VIP for L4 service type LoadBalancer.
  3. AKO only supports one type of IP backend pool per cluster. The AKO ipFamily type must be the same as the IP type of the backend pool.
  4. AKO cannot communicate with an IPv6 Kubernetes API server. You cannot install AKO in IPv6 single-stack or IPv6 primary dual-stack Kubernetes clusters. For more information, see the Support for IPv6 in AKO in the NSX ALB documentation.
  5. After you create a cluster, you cannot change the primary IP family or toggle an existing cluster between single stack and dual-stack.

Configure AKO to Use an IPv4 Backend in an IPv4 Primary Dual-Stack Cluster

  1. Edit the AKODeploymentConfig CR object, or create a new customized AKODeploymentConfig file.

    • Set the AKO ipFamily to V4.
    • Set the data network CIDR to IPv4.
    • To apply this AKO configuration to all workload clusters, update install-ako-for-all.

    For example:

    apiVersion: networking.tkg.tanzu.vmware.com/v1alpha1
kind: AKODeploymentConfig
metadata:
  name: install-ako-on-dual-stack-v4-primary
spec:
  clusterSelector:
    matchLabels:
      cluster-type: "install-ako-on-dual-stack-v4-primary"
  adminCredentialRef:
    name: avi-controller-credentials
    namespace: tkg-system-networking
  certificateAuthorityRef:
    name: avi-controller-ca
    namespace: tkg-system-networking
  cloudName: Default-Cloud
  controlPlaneNetwork:
    cidr: 10.218.48.0/20
    name: VM Network
  controller: 10.186.103.243
  controllerVersion: 22.1.2
  dataNetwork:
    cidr: 10.218.48.0/20
    name: VM Network
  extraConfigs:
    disableStaticRouteSync: false
    ipFamily: V4
    ingress:
      defaultIngressController: false
      disableIngressClass: true
      nodeNetworkList:
      - networkName: VM Network

  2. Create the workload cluster from a configuration file.

    To use a custom AKO configuration, set AVI_LABELS in the cluster configuration to match the cluster selector in AKODeploymentConfig.

    CLUSTER_NAME: test-cluster
TKG_IP_FAMILY: ipv4,ipv6
AVI_LABELS: '{"cluster-type": "install-ako-on-dual-stack-v4-primary"}'

  3. After the cluster is created, check the avi-system/avi-k8s-config file to make sure AKO ipFamily is V4 and vipNetworkList CIDR is IPv4.

    apiVersion: v1
data:
  apiServerPort: "8080"
  cloudName: Default-Cloud
  clusterName: test-cluster
  controllerIP: 10.186.103.243
  controllerVersion: 22.1.2
  defaultIngController: "false"
  deleteConfig: "false"
  disableStaticRouteSync: "false"
  fullSyncFrequency: "1800"
  ipFamily: V4
  logLevel: INFO
  nodeNetworkList: '[{"networkName":"VM Network"}]'
  serviceEngineGroupName: Default-Group
  serviceType: NodePort
  useDefaultSecretsOnly: "false"
  vipNetworkList: '[{"networkName":"VM Network","cidr":"10.218.48.0/20"}]'
kind: ConfigMap

  4. Create a LoadBalancer object YAML file.

    For example, create a file named loadbalancer.yaml with the following contents. Set spec.ipFamilyPolicy to either RequireDualStack or PreferDualStack.

    apiVersion: v1
kind: Service
metadata:
  name: dual
  namespace: test
spec:
  type: LoadBalancer
  ipFamilies:
    - IPv4
    - IPv6
  ipFamilyPolicy: RequireDualStack
  selector:
	corgi: dual
  ports:
      - port: 80
  	targetPort: 80

  5. Install the load balancer service type on the workload cluster.

    kubectl apply -f loadbalancer.yaml

Configure AKO to Use an IPv6 Backend in an IPv4 Primary Dual-Stack Cluster

  1. Edit the AKODeploymentConfig CR object, or create a new customized AKODeploymentConfig file.

    • Set the AKO ipFamily to V6.
    • Set the data network CIDR to IPv4.
    • To apply this AKO configuration to all workload clusters, update install-ako-for-all.

    For example:

    apiVersion: networking.tkg.tanzu.vmware.com/v1alpha1
kind: AKODeploymentConfig
metadata:
  name: install-ako-on-dual-stack-v4-primary
spec:
  clusterSelector:
    matchLabels:
      cluster-type: "install-ako-on-dual-stack-v4-primary"
  adminCredentialRef:
    name: avi-controller-credentials
    namespace: tkg-system-networking
  certificateAuthorityRef:
    name: avi-controller-ca
    namespace: tkg-system-networking
  cloudName: Default-Cloud
  controlPlaneNetwork:
    cidr: 10.218.48.0/20
    name: VM Network
  controller: 10.186.103.243
  controllerVersion: 22.1.2
  dataNetwork:
    cidr: 10.218.48.0/20
    name: VM Network
  extraConfigs:
    disableStaticRouteSync: false
    ipFamily: V6
    ingress:
      defaultIngressController: false
      disableIngressClass: true
      nodeNetworkList:
      - networkName: VM Network

  2. Create the workload cluster from a configuration file.

    To use a custom AKO configuration, set AVI_LABELS in the cluster configuration to match the cluster selector in AKODeploymentConfig.

    CLUSTER_NAME: test-cluster
TKG_IP_FAMILY: ipv4,ipv6
AVI_LABELS: '{"cluster-type": "install-ako-on-dual-stack-v4-primary"}'

  3. After the cluster is created, check the avi-system/avi-k8s-config file to make sure AKO ipFamily is V6 and vipNetworkList CIDR is IPv4.

    apiVersion: v1
data:
  apiServerPort: "8080"
  cloudName: Default-Cloud
  clusterName: test-cluster
  controllerIP: 10.186.103.243
  controllerVersion: 22.1.2
  defaultIngController: "false"
  deleteConfig: "false"
  disableStaticRouteSync: "false"
  fullSyncFrequency: "1800"
  ipFamily: V6
  logLevel: INFO
  nodeNetworkList: '[{"networkName":"VM Network"}]'
  serviceEngineGroupName: Default-Group
  serviceType: NodePort
  useDefaultSecretsOnly: "false"
  vipNetworkList: '[{"networkName":"VM Network","cidr":"10.218.48.0/20"}]'
kind: ConfigMap

  4. Create a LoadBalancer object YAML file.

    For example, create a file named loadbalancer.yaml with the following contents. Set spec.ipFamilyPolicy to either RequireDualStack or PreferDualStack. Set the spec.ipFamilies service to IPv6 if you want to use the secondary IP type to route traffic.

    Example YAML file:

    apiVersion: v1
kind: Service
metadata:
  name: dual
  namespace: test
spec:
  type: LoadBalancer
  ipFamilies:
  - IPv4
  - IPv6
  ipFamilyPolicy: RequireDualStack
  selector:
	corgi: dual
  ports:
      - port: 80
  	targetPort: 80

  5. Install the load balancer service type on the workload cluster.

    kubectl apply -f loadbalancer.yaml

Create Dual-Stack Clusters with NSX Advanced Load Balancer as L7 Ingress Controller

NSX ALB can serve as the ingress service for workload clusters with dual-stack networking in a Tanzu Kubernetes Grid deployment. For general information about how to use NSX ALB as an L7 ingress controller, see NSX Advanced Load Balancer as L7 Ingress Controller.

Supported Configurations

The NSX ALB ingress service in a Tanzu Kubernetes Grid deployment supports the dual-stack configurations shown in the table below.

Cluster IpFamily AKO IpFamily Frontend VIP IpFamily Supported?
IPv4,IPv6 V4 V4 ✔
IPv4,IPv6 V6 V4 ✔
IPv4,IPv6 V4 V6 ✔
IPv4,IPv6 V6 V6 ✔
IPv6,IPv4 V4 V4 ✖
IPv6,IPv4 V6 V4 ✖
IPv6,IPv4 V4 V6 ✖
IPv6,IPv4 V6 V6 ✖

Known Limitations

  1. AKO does not support creatign dual-stack ingress services
  2. AKO cannot communicate with an IPv6 Kubernetes API server. You cannot install AKO in IPv6 single-stack or IPv6 primary dual-stack Kubernetes clusters
  3. NodeportLocal mode is not supported.

For more information, see the Support for IPv6 in AKO in the NSX ALB documentation.

Configure AKO to Use IPv4 Frontend VIP and Backend in an IPv4 Primary Dual-Stack Cluster

  1. Edit the AKODeploymentConfig CR object, or create a new customized AKODeploymentConfig file.

    • Set the AKO ipFamily to V4.
    • Set the data network CIDR to IPv4.
    • To apply this AKO configuration to all workload clusters, update install-ako-for-all.

    For example:

    apiVersion: networking.tkg.tanzu.vmware.com/v1alpha1
kind: AKODeploymentConfig
metadata:
  name: install-ako-on-dual-stack-v4-primary
spec:
  clusterSelector:
    matchLabels:
      cluster-type: "install-ako-on-dual-stack-v4-primary"
  adminCredentialRef:
    name: avi-controller-credentials
    namespace: tkg-system-networking
  certificateAuthorityRef:
    name: avi-controller-ca
    namespace: tkg-system-networking
  cloudName: Default-Cloud
  controlPlaneNetwork:
    cidr: 10.218.48.0/20
    name: VM Network
  controller: 10.186.103.243
  controllerVersion: 22.1.2
  dataNetwork:
    cidr: 10.218.48.0/20
    name: VM Network
  extraConfigs:
    disableStaticRouteSync: false
    ipFamily: V4
    ingress:
      defaultIngressController: true
      disableIngressClass: false
      serviceType: NodePort
      shardVSSize: MEDIUM
      nodeNetworkList:
      - networkName: VM Network

  2. Create the workload cluster from a configuration file.

    To use a custom AKO configuration, set AVI_LABELS in the cluster configuration to match the cluster selector in AKODeploymentConfig.

    CLUSTER_NAME: test-cluster
TKG_IP_FAMILY: ipv4,ipv6
AVI_LABELS: '{"cluster-type": "install-ako-on-dual-stack-v4-primary"}'

  3. After the cluster is created, check the avi-system/avi-k8s-config file to make sure that the AKO ipFamily is V4 and vipNetworkList cidr is IPv4.

    apiVersion: v1
data:
  apiServerPort: "8080"
  cloudName: Default-Cloud
  clusterName: test-cluster
  controllerIP: 10.186.103.243
  controllerVersion: 22.1.2
  defaultIngController: "true"
  deleteConfig: "false"
  disableStaticRouteSync: "false"
  fullSyncFrequency: "1800"
  ipFamily: V4
  logLevel: INFO
  nodeNetworkList: '[{"networkName":"VM Network"}]'
  serviceEngineGroupName: Default-Group
  serviceType: NodePort
  shardVSSize: MEDIUM
  useDefaultSecretsOnly: "false"
  vipNetworkList: '[{"networkName":"VM Network","cidr":"10.218.48.0/20"}]'
kind: ConfigMap

  4. Create an Ingress object YAML file.

    For example, create a file named ingress.yaml with the following contents.

    ---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
 name: cafe-ingress
spec:
 rules:
   - host: cafe.avilocal.lol
     http:
       paths:
         - path: /coffee
           pathType: Prefix
           backend:
             service:
               name: coffee-svc
               port:
                 number: 5678
---
apiVersion: v1
kind: Service
metadata:
 name: coffee-svc
 labels:
   app: coffee
Spec:
 ipFamilies:
   - IPv4
   - IPv6
 ipFamilyPolicy: RequireDualStack
 ports:
   - port: 5678
 selector:
   app: coffee
 type: NodePort
---
apiVersion: apps/v1
kind: Deployment
metadata:
 name: coffee-app
spec:
 selector:
   matchLabels:
     app: coffee
 replicas: 2
 template:
   metadata:
     labels:
       app: coffee
   spec:
     containers:
       - name: http-echo
         image: hashicorp/http-echo:latest
         args:
           - "-text=Connection succeeds"

  5. Install the ingress controller service type on the workload cluster.

    kubectl apply -f ingress.yaml

Configure AKO to use IPv6 frontend VIP and IPv4 backend in dual-stack IPv4 primary cluster

  1. Edit the AKODeploymentConfig CR object, or create a new customized AKODeploymentConfig file.

    • Set the AKO ipFamily to V4.
    • Set the data network CIDR to IPv6.
    • To apply this AKO configuration to all workload clusters, update install-ako-for-all.

    For example:

    apiVersion: networking.tkg.tanzu.vmware.com/v1alpha1
kind: AKODeploymentConfig
metadata:
  name: install-ako-on-dual-stack-v4-primary
spec:
  clusterSelector:
    matchLabels:
      cluster-type: "install-ako-on-dual-stack-v4-primary"
  adminCredentialRef:
    name: avi-controller-credentials
    namespace: tkg-system-networking
  certificateAuthorityRef:
    name: avi-controller-ca
    namespace: tkg-system-networking
  cloudName: Default-Cloud
  controlPlaneNetwork:
    cidr: 10.218.48.0/20
    name: VM Network
  controller: 10.186.103.243
  controllerVersion: 22.1.2
  dataNetwork:
    cidr: 2620:124:6020:c30a::/64
    name: VM Network
  extraConfigs:
    disableStaticRouteSync: false
    ipFamily: V4
    ingress:
      defaultIngressController: true
      disableIngressClass: false
      serviceType: NodePort
      shardVSSize: MEDIUM
      nodeNetworkList:
      - networkName: VM Network

  2. Create the workload cluster from a configuration file.

    To use a custom AKO configuration, set AVI_LABELS in the cluster configuration to match the cluster selector in AKODeploymentConfig.

    CLUSTER_NAME: test-cluster
TKG_IP_FAMILY: ipv4,ipv6
AVI_LABELS: '{"cluster-type": "install-ako-on-dual-stack-v4-primary"}'

  3. After the cluster is created, check the avi-system/avi-k8s-config file to make sure that the AKO ipFamily is V4 and vipNetworkList CIDR is IPv6.

    apiVersion: v1
data:
  apiServerPort: "8080"
  cloudName: Default-Cloud
  clusterName: test-cluster
  controllerIP: 10.186.103.243
  controllerVersion: 22.1.2
  defaultIngController: "true"
  deleteConfig: "false"
  disableStaticRouteSync: "false"
  fullSyncFrequency: "1800"
  ipFamily: V4
  logLevel: INFO
  nodeNetworkList: '[{"networkName":"VM Network"}]'
  serviceEngineGroupName: Default-Group
  serviceType: NodePort
  shardVSSize: MEDIUM
  useDefaultSecretsOnly: "false"
  vipNetworkList: '[{"networkName":"VM Network","v6cidr":"2620:124:6020:c30a::/64"}]'
kind: ConfigMap

  4. Create an Ingress object YAML file.

    For example, create a file named ingress.yaml with the following contents.

    ---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
 name: cafe-ingress
spec:
 rules:
   - host: cafe.avilocal.lol
     http:
       paths:
         - path: /coffee
           pathType: Prefix
           backend:
             service:
               name: coffee-svc
               port:
                 number: 5678
---
apiVersion: v1
kind: Service
metadata:
 name: coffee-svc
 labels:
   app: coffee
Spec:
 ipFamilies:
  - IPv4
  - IPv6
  ipFamilyPolicy: RequireDualStack
 ports:
   - port: 5678
 selector:
   app: coffee
 type: NodePort
---
apiVersion: apps/v1
kind: Deployment
metadata:
 name: coffee-app
spec:
 selector:
   matchLabels:
     app: coffee
 replicas: 2
 template:
   metadata:
     labels:
       app: coffee
   spec:
     containers:
       - name: http-echo
         image: hashicorp/http-echo:latest
         args:
           - "-text=Connection succeeds"

  5. Install the ingress controller service type on the workload cluster.

    kubectl apply -f ingress.yaml

Configure AKO to use IPv4 frontend VIP and IPv6 backend in dual-stack IPv4 primary cluster

  1. Edit the AKODeploymentConfig CR object, or create a new customized AKODeploymentConfig file.

    • Set the AKO ipFamily to V6.
    • Set the data network CIDR to IPv4.
    • To apply this AKO configuration to all workload clusters, update install-ako-for-all.

    For example:

    apiVersion: networking.tkg.tanzu.vmware.com/v1alpha1
kind: AKODeploymentConfig
metadata:
  name: install-ako-on-dual-stack-v4-primary
spec:
  clusterSelector:
    matchLabels:
      cluster-type: "install-ako-on-dual-stack-v4-primary"
  adminCredentialRef:
    name: avi-controller-credentials
    namespace: tkg-system-networking
  certificateAuthorityRef:
    name: avi-controller-ca
    namespace: tkg-system-networking
  cloudName: Default-Cloud
  controlPlaneNetwork:
    cidr: 10.218.48.0/20
    name: VM Network
  controller: 10.186.103.243
  controllerVersion: 22.1.2
  dataNetwork:
    cidr: 10.218.48.0/20
    name: VM Network
  extraConfigs:
    disableStaticRouteSync: false
    ipFamily: V6
    ingress:
      defaultIngressController: true
      disableIngressClass: false
      serviceType: NodePort
      shardVSSize: MEDIUM
      nodeNetworkList:
      - networkName: VM Network

  2. Create the workload cluster from a configuration file.

    To use a custom AKO configuration, set AVI_LABELS in the cluster configuration to match the cluster selector in AKODeploymentConfig.

    CLUSTER_NAME: test-cluster
TKG_IP_FAMILY: ipv4,ipv6
AVI_LABELS: '{"cluster-type": "install-ako-on-dual-stack-v6-primary"}'

  3. After the cluster is created, check configmap avi-system/avi-k8s-config to make sure that the AKO ipFamily is V6 and vipNetworkList CIDR is IPv4.

    apiVersion: v1
data:
  apiServerPort: "8080"
  cloudName: Default-Cloud
  clusterName: test-cluster
  controllerIP: 10.186.103.243
  controllerVersion: 22.1.2
  defaultIngController: "true"
  deleteConfig: "false"
  disableStaticRouteSync: "false"
  fullSyncFrequency: "1800"
  ipFamily: V6
  logLevel: INFO
  nodeNetworkList: '[{"networkName":"VM Network"}]'
  serviceEngineGroupName: Default-Group
  serviceType: NodePort
  shardVSSize: MEDIUM
  useDefaultSecretsOnly: "false"
  vipNetworkList: '[{"networkName":"VM Network","cidr":"10.218.48.0/20"}]'
kind: ConfigMap

  4. Create an Ingress object YAML file.

    For example, create a file named ingress.yaml with the following contents. To use a secondary IP type to route traffic, set service spec.ipFamilies to IPv6.

    ---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
 name: cafe-ingress
spec:
 rules:
   - host: cafe.avilocal.lol
     http:
       paths:
         - path: /coffee
           pathType: Prefix
           backend:
             service:
               name: coffee-svc
               port:
                 number: 5678
---
apiVersion: v1
kind: Service
metadata:
 name: coffee-svc
 labels:
   app: coffee
spec:
 ipFamilies:
  - IPv4
  - IPv6
  ipFamilyPolicy: RequireDualStack
 ports:
   - port: 5678
 selector:
   app: coffee
 type: NodePort
---
apiVersion: apps/v1
kind: Deployment
metadata:
 name: coffee-app
spec:
 selector:
   matchLabels:
     app: coffee
 replicas: 2
 template:
   metadata:
     labels:
       app: coffee
   spec:
     containers:
       - name: http-echo
         image: hashicorp/http-echo:latest
         args:
           - "-text=Connection succeeds"

  5. Install the ingress controller service type on the workload cluster.

    kubectl apply -f ingress.yaml

Configure AKO to use IPv6 frontend VIP and IPv6 backend in dual-stack IPv4 primary cluster

  1. Edit the AKODeploymentConfig CR object, or create a new customized AKODeploymentConfig file.

    • Set the AKO ipFamily to V6.
    • Set the data network CIDR to IPv6.
    • To apply this AKO configuration to all workload clusters, update install-ako-for-all.

    For example:

    apiVersion: networking.tkg.tanzu.vmware.com/v1alpha1
kind: AKODeploymentConfig
metadata:
  name: install-ako-on-dual-stack-v4-primary
spec:
  clusterSelector:
    matchLabels:
      cluster-type: "install-ako-on-dual-stack-v4-primary"
  adminCredentialRef:
    name: avi-controller-credentials
    namespace: tkg-system-networking
  certificateAuthorityRef:
    name: avi-controller-ca
    namespace: tkg-system-networking
  cloudName: Default-Cloud
  controlPlaneNetwork:
    cidr: 10.218.48.0/20
    name: VM Network
  controller: 10.186.103.243
  controllerVersion: 22.1.2
  dataNetwork:
    cidr: 2620:124:6020:c30a::/64
    name: VM Network
  extraConfigs:
    disableStaticRouteSync: false
    ipFamily: V6
    ingress:
      defaultIngressController: true
      disableIngressClass: false
      serviceType: NodePort
      shardVSSize: MEDIUM
      nodeNetworkList:
      - networkName: VM Network

  2. Create the workload cluster from a configuration file.

    To use a custom AKO configuration, set AVI_LABELS in the cluster configuration to match the cluster selector in AKODeploymentConfig.

    CLUSTER_NAME: test-cluster
TKG_IP_FAMILY: ipv4,ipv6
AVI_LABELS: '{"cluster-type": "install-ako-on-dual-stack-v6-primary"}'

  3. After the cluster is created, check the avi-system/avi-k8s-config file to make sure that the AKO ipFamily is V6 and vipNetworkList CIDR is IPv6.

    apiVersion: v1
data:
  apiServerPort: "8080"
  cloudName: Default-Cloud
  clusterName: test-cluster
  controllerIP: 10.186.103.243
  controllerVersion: 22.1.2
  defaultIngController: "true"
  deleteConfig: "false"
  disableStaticRouteSync: "false"
  fullSyncFrequency: "1800"
  ipFamily: V6
  logLevel: INFO
  nodeNetworkList: '[{"networkName":"VM Network"}]'
  serviceEngineGroupName: Default-Group
  serviceType: NodePort
  shardVSSize: MEDIUM
  useDefaultSecretsOnly: "false"
  vipNetworkList: '[{"networkName":"VM Network","v6cidr":"2620:124:6020:c30a::/64"}]'
kind: ConfigMap

  4. Create an Ingress object YAML file.

    For example, create a file named ingress.yaml with the following contents. To use a secondary IP type to route traffic, set service spec.ipFamilies to IPv6.

    ---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
 name: cafe-ingress
spec:
 rules:
   - host: cafe.avilocal.lol
     http:
       paths:
         - path: /coffee
           pathType: Prefix
           backend:
             service:
               name: coffee-svc
               port:
                 number: 5678
---
apiVersion: v1
kind: Service
metadata:
 name: coffee-svc
 labels:
   app: coffee
spec:
 ipFamilies:
  - IPv4
  - IPv6
  ipFamilyPolicy: RequireDualStack
 ports:
   - port: 5678
 selector:
   app: coffee
 type: NodePort
---
apiVersion: apps/v1
kind: Deployment
metadata:
 name: coffee-app
spec:
 selector:
   matchLabels:
     app: coffee
 replicas: 2
 template:
   metadata:
     labels:
       app: coffee
   spec:
     containers:
       - name: http-echo
         image: hashicorp/http-echo:latest
         args:
           - "-text=Connection succeeds"

  5. Install the ingress controller service type on the workload cluster.

    kubectl apply -f ingress.yaml
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