K8s deployment (#1113)

* added kubernetes deployment yml for selenium grid 4

* fixed typo in the comments section of k8s yml.

* added k8s deployment instructions in README.md

* added github action to test on minikube

.github/workflows/k8s-deploy-test.yml

@@ -0,0 +1,69 @@
+name: "Test Selenium Grid 4 deployment on Minikube Cluster"
+
+on:
+  push:
+    branches:
+      - trunk
+  pull_request:
+    branches:
+      - trunk
+
+jobs:
+  deploy:
+    name: Deployment and testing of Grid 4 on Minikube
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Setup Minikube
+        uses: manusa/actions-setup-minikube@v2.0.1
+        with:
+          minikube version: "v1.13.1"
+          kubernetes version: "v1.19.2"
+          github token: ${{ secrets.GITHUB_TOKEN }}
+          driver: none
+      - name: Interact with Minikube
+        run: kubectl get nodes
+      - name: Output Cluster info
+        run: |
+          kubectl cluster-info
+          kubectl get pods -n kube-system
+          echo "current-context:" $(kubectl config current-context)
+          echo "environment-kubeconfig:" ${KUBECONFIG}
+      - name: Deploy Grid4 on minikube
+        run: kubectl apply -f k8s-deployment-full-grid.yaml
+      - name: Expose Router service
+        run: kubectl expose deployment selenium-router-deployment --type=NodePort --port=4444 --target-port=4444
+      - name: Wait for Pods to get started
+        run: |
+          sleep 10
+          podsCount=$(kubectl get pods -l component=selenium-grid-4 | wc -l)
+          ctr=0
+          while [ $podsCount -lt 6 ]
+          do
+            ((ctr++))
+            if [[ $ctr -eq 30 ]]; then
+              echo "Timed out while waiting for Pods to get ready"
+              exit 1
+            fi
+            echo "Waiting for pods to get started...."
+            sleep 10
+            podsCount=$(kubectl get pods -l component=selenium-grid-4 | wc -l)
+          done
+          echo "All the pods are started"
+      - name: Waiting for Pods to get ready
+        run: |
+          echo "Waiting for pods to attain ready state...."
+          kubectl wait --for=condition=ready pod -l name=selenium-router --timeout=300s
+          kubectl wait --for=condition=ready pod -l name=selenium-distributor --timeout=300s
+          kubectl wait --for=condition=ready pod -l name=selenium-event-bus --timeout=300s
+          kubectl wait --for=condition=ready pod -l name=selenium-chrome-node --timeout=300s
+          kubectl get pods -l component=selenium-grid-4
+          echo "All pods are in ready state now"
+      - name: Listing all the Grid 4 components
+        run: kubectl get all -l component=selenium-grid-4
+      - name: Testing the Grid
+        run: |
+          SELENIUM_GRID_URL=$(minikube service selenium-router-deployment --url)
+          echo $SELENIUM_GRID_URL
+          python3 $PWD/tests/K8sSmokeTest.py $SELENIUM_GRID_URL

README.md

@@ -244,7 +244,21 @@ Here is an example using a Hub and 3 Nodes (Chrome, Firefox, and Opera):
 
 ___
 
-## Deploying to Kubernetes (:warning: not tested yet with Selenium 4 images)
+## Deploying to Kubernetes
+Here are the steps to deploy the Grid 4 to a Kubernetes cluster.
+``` bash
+# Deploying all the grid components to kubernetes
+$ kubectl apply -f k8s-deployment-full-grid.yaml
+
+# Exposing the router
+$ kubectl expose deployment selenium-router-deployment --type=NodePort --port=4444
+
+# Get the router URL to access the grid from outside K8s cluster
+$ minikube service selenium-router-deployment --url
+
+# To list all the Grid componenets
+$ kubectl get all -l component=selenium-grid-4
+```
 
 Check out [the Kubernetes examples](https://github.com/kubernetes/examples/tree/master/staging/selenium)
 on how to deploy selenium hub and nodes on a Kubernetes cluster.