create-gke-cluster.yml

# more details this workflow and other at https://github.com/didier-durand/gcloud-tests
name: Create GKE cluster

on:  
  
  workflow_dispatch:
    inputs:

  push:
    #protection to avoid triggering when other workflow is modified
    paths: 
    - '!.github/workflows/**'
    - '.github/workflows/create-gke-cluster.yml'
    
  schedule:
    - cron:  '0 1 * * MON' 

env:
  GCP_ZONE: us-central1-c
  GCP_VERBOSITY: warning
  GKE_CLUSTER: test-gke-cluster
  GKE_SERVICE: tutum-hello-world

jobs:
  create-delete-GKE-cluster:
  
    runs-on: ubuntu-latest

    steps:
        
    - name: Checkout
      uses: actions/checkout@v2.3.4

    - name: Setup gcloud CLI
      uses: google-github-actions/setup-gcloud@master
      with:
        project_id: ${{ secrets.GCP_PROJECT }}
        service_account_key: ${{ secrets.GCP_SA_KEY }}
        
    - name: Get gcloud version & info
      run: |-
        echo '--- gcloud version ---'
        gcloud version
        echo '--- gcloud info ---'
        gcloud info --anonymize

    - name: Clean up
      run: |-
        gcloud container clusters list --verbosity=$GCP_VERBOSITY --project=${{ secrets.GCP_PROJECT }}
        gcloud container clusters delete $GKE_CLUSTER --verbosity=$GCP_VERBOSITY --project=${{ secrets.GCP_PROJECT }} --zone=$GCP_ZONE --quiet || true
        
    - name: Create GKE cluster
      run: |-
        gcloud container clusters create $GKE_CLUSTER --verbosity=$GCP_VERBOSITY --project=${{ secrets.GCP_PROJECT }} --zone $GCP_ZONE --quiet --num-nodes=3
    
    - name: Get the GKE credentials to deploy to the cluster
      run: |-
        gcloud container clusters get-credentials $GKE_CLUSTER --zone $GCP_ZONE
        
    - name: Deploy tutum/hello-world to GKE cluster
      run: |-
        # grant auths for access (|| true to avoid failure when repeated)
        echo "create cluster role binding for anonymous:"
        kubectl create clusterrolebinding anonymous-cluster-admin-binding --clusterrole=cluster-admin --user=system:anonymous || true

        # deploy on cluster
        echo "apply $GKE_SERVICE.yaml: "
        kubectl delete -f "kubernetes/$GKE_SERVICE.yaml" || true
        kubectl apply -f "kubernetes/$GKE_SERVICE.yaml"

        # get service DNS name
        kubectl get svc "$GKE_SERVICE"

        #wait until public IP address gets published on Internet
        while [[ $(TERM=dumb kubectl get svc "$GKE_SERVICE" | grep "$GKE_SERVICE" -m 1 | awk '{ print $4 }') == *'<pending>'* ]]
        do
          echo "sleep 5s to get dns: $GKE_SERVICE"
          sleep 5s
        done
        sleep 5s
        export GKE_SERVICE_DNS=$(TERM=dumb kubectl get svc "$GKE_SERVICE" | grep "$GKE_SERVICE" -m 1 | awk '{ print $4 }') 
        echo "gke service dns: |$GKE_SERVICE_DNS|"
        while [[ $(nslookup "$GKE_SERVICE_DNS") == *'NXDOMAIN'* ]]
        do
          echo "sleep 5s for nslookup: |$GKE_SERVICE_DNS|"
          sleep 5s
        done

        # service can now be called (http)
        export HTTP_CURL=$(curl --insecure "http://$GKE_SERVICE_DNS")
        echo "http curl: $HTTP_CURL"
        echo "$HTTP_CURL" | grep "$GKE_SERVICE"
        echo "service $GKE_SERVICE sucessfully tested!"
            
    - name: Delete GKE cluster
      if: ${{ always() }}
      run: |-
        gcloud container clusters list --verbosity=$GCP_VERBOSITY --project=${{ secrets.GCP_PROJECT }}
        gcloud container clusters delete $GKE_CLUSTER --verbosity=$GCP_VERBOSITY --project=${{ secrets.GCP_PROJECT }} --zone=$GCP_ZONE --quiet