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Deploying Antrea on a GKE cluster

We support running Antrea inside of GKE clusters on Ubuntu Node. Antrea would operate in NetworkPolicy only mode, in which no encapsulation is required for any kind of traffic (Intra Node, Inter Node, etc) and NetworkPolicies are enforced using OVS. Antrea is supported on both VPC-native Enable/Disable modes.

GKE Prerequisites

Install the Google Cloud SDK (gcloud). Refer to Google Cloud SDK installation guide
```
curl https://sdk.cloud.google.com | bash
```
Make sure you are authenticated to use the Google Cloud API
```
export ADMIN_USER=user@email.com
gcloud auth login
```

Create a project or use an existing one

export GKE_PROJECT=gke-clusters
gcloud projects create $GKE_PROJECT

Creating the cluster

You can use any method to create a GKE cluster (gcloud SDK, gcloud Console, etc). The example given here is using the Google Cloud SDK.

Note: Antrea is supported on Ubuntu Nodes only for GKE cluster. When creating the cluster, you must use the default network provider and must not enable “Dataplane V2”.

Create a GKE cluster

export GKE_ZONE="us-west1"
export GKE_HOST="UBUNTU"
gcloud container --project $GKE_PROJECT clusters create cluster1 --image-type $GKE_HOST \
   --zone $GKE_ZONE --enable-ip-alias

Access your cluster

kubectl get nodes
NAME                                      STATUS   ROLES    AGE     VERSION
gke-cluster1-default-pool-93d7da1c-61z4   Ready    <none>   3m11s   1.25.7-gke.1000
gke-cluster1-default-pool-93d7da1c-rkbm   Ready    <none>   3m9s    1.25.7-gke.1000

Create a cluster-admin ClusterRoleBinding
```
kubectl create clusterrolebinding cluster-admin-binding --clusterrole cluster-admin --user user@email.com
```
Note: To create clusterRoleBinding, the user must have container.clusterRoleBindings.create permission. Use this command to enable it, if the previous command fails due to permission error. Only cluster Admin can assign this permission.
```
gcloud projects add-iam-policy-binding $GKE_PROJECT --member user:user@email.com --role roles/container.admin
```

Deploying Antrea

Prepare the Cluster Nodes

Deploy antrea-node-init DaemonSet to enable kubelet to operate in CNI mode.

kubectl apply -f https://raw.githubusercontent.com/antrea-io/antrea/main/build/yamls/antrea-gke-node-init.yml

Deploy Antrea

To deploy a released version of Antrea, pick a deployment manifest from the list of releases. Note that GKE support was added in release 0.5.0, which means you cannot pick a release older than 0.5.0. For any given release <TAG> (e.g. v0.5.0), you can deploy Antrea as follows:

kubectl apply -f https://github.com/antrea-io/antrea/releases/download/<TAG>/antrea-gke.yml

To deploy the latest version of Antrea (built from the main branch), use the checked-in deployment yaml:

kubectl apply -f https://raw.githubusercontent.com/antrea-io/antrea/main/build/yamls/antrea-gke.yml

The command will deploy a single replica of Antrea controller to the GKE cluster and deploy Antrea agent to every Node. After a successful deployment you should be able to see these Pods running in your cluster:

$ kubectl get pods --namespace kube-system  -l app=antrea -o wide
NAME                                READY   STATUS    RESTARTS   AGE   IP              NODE                                      NOMINATED NODE   READINESS GATES
antrea-agent-24vwr                  2/2     Running   0          46s   10.138.15.209   gke-cluster1-default-pool-93d7da1c-rkbm   <none>           <none>
antrea-agent-7dlcp                  2/2     Running   0          46s   10.138.15.206   gke-cluster1-default-pool-9ba12cea-wjzn   <none>           <none>
antrea-controller-5f9985c59-5crt6   1/1     Running   0          46s   10.138.15.209   gke-cluster1-default-pool-93d7da1c-rkbm   <none>           <none>

Restart remaining Pods

Once Antrea is up and running, restart all Pods in all Namespaces (kube-system, etc) so they can be managed by Antrea.

$ kubectl delete pods -n kube-system $(kubectl get pods -n kube-system -o custom-columns=NAME:.metadata.name,HOSTNETWORK:.spec.hostNetwork --no-headers=true | grep '<none>' | awk '{ print $1 }')
pod "event-exporter-gke-755c4b4d97-wqlcg" deleted
pod "konnectivity-agent-5cb8ff9b9-2cv5j" deleted
pod "konnectivity-agent-5cb8ff9b9-5jpvp" deleted
pod "konnectivity-agent-autoscaler-7dc78c8c9-kqn9f" deleted
pod "kube-dns-5b5dfcd97b-79m4c" deleted
pod "kube-dns-5b5dfcd97b-q49qj" deleted
pod "kube-dns-autoscaler-5f56f8997c-kqrgx" deleted
pod "l7-default-backend-d6b749b76-bsv9l" deleted
pod "metrics-server-v0.5.2-67864775dc-bhd9p" deleted