Kubernetes/Google GKE

Create a cluster

gcloud container clusters create \
    --cluster-version=1.13 --image-type=UBUNTU \
    --disk-type=pd-ssd --disk-size=10GB \
    --no-enable-cloud-logging --no-enable-cloud-monitoring \
    --addons=NetworkPolicy --issue-client-certificate \
    --region europe-west1-b --username=admin cluster-1
WARNING: In June 2019, node auto-upgrade will be enabled by default for newly created clusters and node pools. To disable it, use the `--no-enable-autoupgrade` flag.
WARNING: Starting in 1.12, default node pools in new clusters will have their legacy Compute Engine instance metadata endpoints disabled by default. To create a cluster with legacy instance metadata endpoints disabled in the default node pool, run `clusters create` with the flag `--metadata disable-legacy-endpoints=true`.
WARNING: The Pod address range limits the maximum size of the cluster. Please refer to https://cloud.google.com/kubernetes-engine/docs/how-to/flexible-pod-cidr to learn how to optimize IP address allocation.
This will disable the autorepair feature for nodes. Please see https://cloud.google.com/kubernetes-engine/docs/node-auto-repair for more information on node autorepairs.
Creating cluster cluster-1 in europe-west1-b... Cluster is being health-checked (master is healthy)...done.              
Created [https://container.googleapis.com/v1/projects/responsive-sun-246311/zones/europe-west1-b/clusters/cluster-1].
To inspect the contents of your cluster, go to: https://console.cloud.google.com/kubernetes/workload_/gcloud/europe-west1-b/cluster-1?project=responsive-sun-246311
kubeconfig entry generated for cluster-1.
NAME       LOCATION        MASTER_VERSION  MASTER_IP       MACHINE_TYPE   NODE_VERSION  NUM_NODES  STATUS
cluster-1  europe-west1-b  1.13.7-gke.8    35.205.145.199  n1-standard-1  1.13.7-gke.8  3          RUNNING

#Free up some resources
watch -d kubectl get pods --all-namespaces
kubectl -n kube-system scale --replicas=0 deployment/kube-dns-autoscaler
kubectl -n kube-system scale --replicas=1 deployment/kube-dns

Resize cluster

To save some money you can resize you cluster to zero nodes, because for running Control-Plane nodes you are not billed. Example below resizes cluster-1 cluster.

$ gcloud container clusters resize cluster-1 --size=0
Pool [default-pool] for [cluster-1] will be resized to 0.
Do you want to continue (Y/n)?  y
Resizing cluster-1...done.                                                                                            
Updated [https://container.googleapis.com/v1/projects/responsive-sun-123456/zones/europe-west1-b/clusters/cluster-1]

All pods will get terminated and required pods eg. kube-dns, metrics-server will change status to pending. They will get rescheduled once nodes are added to the cluster.

Cluster commands

gcloud container clusters list
gcloud container clusters describe cluster-1
gcloud container clusters delete   cluster-1

Configure kubectl

$ gcloud container clusters get-credentials cluster-1 #--zone <europe-west1-b> --project <project>
Fetching cluster endpoint and auth data.
kubeconfig entry generated for cluster-1

$ cat ~/.kube/config 
apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: 
AABBCCFF112233
    server: https://35.205.145.199
  name: gke_responsive-sun-246311_europe-west1-b_cluster-1
contexts:
- context:
    cluster: gke_responsive-sun-246311_europe-west1-b_cluster-1
    user: gke_responsive-sun-246311_europe-west1-b_cluster-1
  name: gke_responsive-sun-246311_europe-west1-b_cluster-1
current-context: gke_responsive-sun-246311_europe-west1-b_cluster-1
kind: Config
preferences: {}
users:
- name: gke_responsive-sun-246311_europe-west1-b_cluster-1
  user:
    auth-provider:
      config:
        cmd-args: config config-helper --format=json
        cmd-path: /usr/lib/google-cloud-sdk/bin/gcloud
        expiry-key: '{.credential.token_expiry}'
        token-key: '{.credential.access_token}'
      name: gcp