Enabling Multicast using Weave-Net CNI plugin on AWS EKS cluster

You can enable multicasting on AWS EKS cluster only for Kubernetes versions 1.21 or above,

Before you begin

  • Create a role on AWS having the necessary privileges for creating AWS clusters (example: AWS_EKS_CLUSTER_ROLE).
  • Create a minimum of two subnets within the VPC. You must create the cluster within this VPC.

About this task

To enable multicasting on AWS EKS cluster using Weave-Net CNI plugin, complete the following steps:


  1. Use the AWS CLI and create an EKS cluster without any node group.
    Note: Multicasting will not work if you create clusters using AWS web console.

    Sample Command:

    aws eks create-cluster --region <region-name> --name <cluster-name> --kubernetes-version 1.21 --role-arn <full-arn-of-the-role> --resources-vpc-config subnetIds=<subnet-id1>,<subnet-id2>,...<subnet-idn>
  2. Run the following command to delete the aws-node default daemon-set:
    kubectl delete ds aws-node -n kube-system command
    This disables the default vpc-cni plugin.
  3. Confirm if your security group allows TCP port 6783 and UDP ports 6783 and 6784. If your security group does not allow these ports, add the necessary firewall rules to your security groups to allow these ports.
  4. Run the following command to delete the kube-proxy ds:
    kubectl delete ds kube-proxy -n kube-system 
  5. Run the following command to create an add-on for Kube-proxy:
    aws eks create-addon --cluster-name <your-cluster-name> --addon-name kube-proxy --resolve-conflicts OVERWRITE
    This will add the latest kube-proxy add-on to the cluster, based on the Kubernetes cluster version.
  6. Run the following command to apply weave-net daemoset:
    kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
  7. Verify the Daemon sets on cluster. There should be two daemon sets for Weave and correspondingly two Kube-proxy daemon sets.
  8. Add the node group to the Cluster and wait till the nodes are created and all the required nodes are ready.
  9. Deploy the Unica product and verify the Multicasting.