Multicluster setup (n > 2) (#722)

- change the Makefile targets so that they run in a for loop
- add tests for terratest for round-robin @ 3 clusters (failover is still pending)
- change the helm chart to be able to set up more than one hostAlias entry for a pod
- add simple script that generates the yaml configs for k3d clusters so that we are DRY

Signed-off-by: Jirka Kremser <jiri.kremser@gmail.com>

.github/workflows/terratest.yaml

@@ -46,8 +46,21 @@ jobs:
           cluster-name: "test-gslb2"
           args: -c k3d/test-gslb2.yaml
 
+      - name: Create 3rd k3s Cluster
+        uses: AbsaOSS/k3d-action@v1.5.0
+        with:
+          cluster-name: "test-gslb3"
+          args: -c k3d/test-gslb3.yaml
+
       - name: K8GB deployment
-        run: make deploy-candidate
+        run: |
+          make deploy-test-version list-running-pods CLUSTERS_NUMBER=3
+          echo "Cluster 1 (eu):"
+          kubectl get no -owide --context=k3d-test-gslb1
+          echo "Cluster 2 (us):"
+          kubectl get no -owide --context=k3d-test-gslb2
+          echo "Cluster 3 (cz):"
+          kubectl get no -owide --context=k3d-test-gslb3
 
       - name: Terratest
         run: make terratest

.github/workflows/upgrade-testing.yaml

@@ -46,11 +46,17 @@ jobs:
           cluster-name: "test-gslb2"
           args: -c k3d/test-gslb2.yaml
 
+      - name: Create 3rd k3s Cluster
+        uses: AbsaOSS/k3d-action@v1.5.0
+        with:
+          cluster-name: "test-gslb3"
+          args: -c k3d/test-gslb3.yaml
+
       - name: K8GB deploy stable version
-        run: make deploy-stable-version
+        run: make deploy-stable-version list-running-pods CLUSTERS_NUMBER=3
 
       - name: K8GB deploy test version
-        run: make deploy-test-version
+        run: make deploy-test-version list-running-pods CLUSTERS_NUMBER=3
 
       - name: Terratest
         run: make terratest

.gitignore

@@ -21,3 +21,6 @@ chart/k8gb/charts/*.tgz
 
 # gh-pages | Jekyll generated files
 _site
+
+# generated k3d configs
+k3d/test-gslb[!1-3].yaml