Sanitize client config object names and create a script to deploy on …

…GKE multi cluster [K8SSAND-931] (k8ssandra#158)

* Sanitize client config object names and create a script to deploy on GKE multi cluster

* Remove the reliance on kubectx and remove the k8ssandra cluster creation from the script

aux-config/default/cass-operator/kustomization.yaml

@@ -1,4 +1,4 @@
 namespace: default
 resources:
-- github.com/k8ssandra/cass-operator/config/default?ref=v1.8.0-rc.1
+- github.com/k8ssandra/cass-operator/config/default?ref=v1.8.0-rc.2
 # namePrefix: cass-operator- # Can be removed in this case because cass-operator already has a namePrefix defined in the repo.

docs/install/deploy-gke-multi.sh

@@ -0,0 +1,84 @@
+#!/usr/bin/env bash
+#
+# As a prerequisite, cluster1 and cluster2 need to have a firewall rules allowing
+# communications between their Pods CIDRs on ports 7000/7001 (Gossip) and 8080 (management API)
+#
+# Change the following variables to match your setup
+# cluster1=k8ssandra-testing-dc1
+# zone1=us-central1-c
+# cluster2=k8ssandra-testing-dc2
+# zone2=us-west1-a
+# gcp_project=community-ecosystem
+
+
+# Add kubeconfig entries for both clusters
+gcloud container clusters get-credentials $cluster1 --zone $zone1 --project $gcp_project
+gcloud container clusters get-credentials $cluster2 --zone $zone2 --project $gcp_project
+
+# Install cert manager on both clusters
+kubectl config use-context gke_${gcp_project}_${zone1}_${cluster1}
+kubectl apply -f https://github.com/jetstack/cert-manager/releases/download/v1.3.1/cert-manager.yaml
+kubectl config use-context gke_${gcp_project}_${zone2}_${cluster2}
+kubectl apply -f https://github.com/jetstack/cert-manager/releases/download/v1.3.1/cert-manager.yaml
+
+# Install the k8ssandra control plane
+kubectl config use-context gke_${gcp_project}_${zone1}_${cluster1}
+kustomize build aux-config/control_plane | kubectl apply -f -
+
+# Install the k8ssandra data plane
+kubectl config use-context gke_${gcp_project}_${zone2}_${cluster2}
+kustomize build aux-config/data_plane | kubectl apply -f -
+
+# Create the client config
+export KUBECONFIG=./build/kubeconfigs/${cluster1}.yaml
+gcloud container clusters get-credentials ${cluster1} --zone ${zone1} --project ${gcp_project}
+export KUBECONFIG=./build/kubeconfigs/${cluster2}.yaml
+gcloud container clusters get-credentials ${cluster2} --zone ${zone2} --project ${gcp_project}
+unset KUBECONFIG
+
+scripts/create-clientconfig.sh --src-kubeconfig build/kubeconfigs/${cluster2}.yaml --dest-kubeconfig build/kubeconfigs/${cluster1}.yaml --in-cluster-kubeconfig build/kubeconfigs/${cluster2}.yaml --output-dir clientconfig
+
+# Restart the k8ssandra-operator pod on the control-plane
+kubectl config use-context gke_${gcp_project}_${zone1}_${cluster1}
+kubectl delete pod -l control-plane=k8ssandra-operator
+
+# Create a K8ssandraCluster
+echo "You can create a K8ssandra cluster by running the following command, after adjusting it to match your requirements: 
+
+cat <<EOF | kubectl apply -f -
+apiVersion: k8ssandra.io/v1alpha1
+kind: K8ssandraCluster
+metadata:
+  name: demo
+spec:
+  cassandra:
+    cluster: demo
+    serverVersion: "4.0.0"
+    serverImage: k8ssandra/cass-management-api:4.0.0-v0.1.29
+    storageConfig:
+      cassandraDataVolumeClaimSpec:
+        storageClassName: standard
+        accessModes:
+          - ReadWriteOnce
+        resources:
+          requests:
+            storage: 5Gi
+    config:
+      jvmOptions:
+        heapSize: 512M
+    datacenters:
+      - metadata:
+          name: dc1
+        size: 3
+        stargate:
+          size: 1
+          heapSize: 256M
+      - metadata:
+          name: dc2
+        k8sContext: gke_${gcp_project}_${zone2}_${cluster2}
+        size: 3
+        stargate:
+          size: 1
+          heapSize: 256M 
+EOF
+"

scripts/create-clientconfig.sh

@@ -152,12 +152,13 @@ users:
     token: $sa_token
 EOF
 
-output_secret="$src_context-config"
+output_secret=$(echo "$src_context-config" | tr '_' '-')
 echo "Creating secret $output_secret"
 
+kubectl $dest_kubeconfig_opt $dest_context_opt $namespace_opt delete secret $output_secret || true
 kubectl $dest_kubeconfig_opt $dest_context_opt $namespace_opt create secret generic $output_secret --from-file="$output_kubeconfig"
 
-clientconfig_name="$src_context"
+clientconfig_name=$(echo "$src_context" | tr '_' '-')
 clientconfig_path="${output_dir}/${clientconfig_name}.yaml"
 echo "Creating ClientConfig $clientconfig_path"
 cat > "$clientconfig_path" <<EOF