To enable multi-zone cluster, add --additional-zones $zone2, $zone3, … into the command when you create the cluster.
Just like AWS, GCP has service quota limits as well. You could use gcloud compute project-info describe –project $PROJECT_NAME to check the quota and request an increase from the GCP console if needed.
Let's launch a two-nodes cluster per zone first:
// launch a multi-zone cluster with 2 nodes per zone.
# gcloud container clusters create my-k8s-cluster --cluster-version 1.9.2-gke.1 --machine-type f1-micro --num-nodes 2 --network k8s-network --tags private --scopes=storage-rw,compute-ro --zone us-central1-a --additional-zones us-central1-b,us-central1-c
Creating cluster my-k8s-cluster...done.
Created [https://container.googleapis.com/v1/projects/kubernetes-cookbook/zones/us-central1-a/clusters/my-k8s-cluster].
To inspect the contents of your cluster, go to: https://console.cloud.google.com/kubernetes/workload_/gcloud/us-central1-a/my-k8s-cluster?project=kubernetes-cookbook
kubeconfig entry generated for my-k8s-cluster.
NAME LOCATION MASTER_VERSION MASTER_IP MACHINE_TYPE NODE_VERSION NUM_NODES STATUS
my-k8s-cluster us-central1-a 1.9.2-gke.1 35.226.67.179 f1-micro 1.9.2-gke.1 6 RUNNING
We find we have six nodes now:
# kubectl get nodes
NAME STATUS ROLES AGE VERSION
gke-my-k8s-cluster-default-pool-068d31a2-q909 Ready <none> 8m v1.9.2-gke.1
gke-my-k8s-cluster-default-pool-068d31a2-rqzw Ready <none> 8m v1.9.2-gke.1
gke-my-k8s-cluster-default-pool-64a6ead8-qf6z Ready <none> 8m v1.9.2-gke.1
gke-my-k8s-cluster-default-pool-64a6ead8-x8cc Ready <none> 8m v1.9.2-gke.1
gke-my-k8s-cluster-default-pool-798c4248-2r4p Ready <none> 8m v1.9.2-gke.1
gke-my-k8s-cluster-default-pool-798c4248-skdn Ready <none> 8m v1.9.2-gke.1
Let's check if the nodes are spread across the three zones we specified:
# gcloud compute instance-groups list NAME LOCATION SCOPE NETWORK MANAGED INSTANCES gke-my-k8s-cluster-default-pool-068d31a2-grp us-central1-a zone k8s-network Yes 2 gke-my-k8s-cluster-default-pool-64a6ead8-grp us-central1-c zone k8s-network Yes 2 gke-my-k8s-cluster-default-pool-798c4248-grp us-central1-b zone k8s-network Yes 2