kind_springboot

Step 1: Create Kind Cluster

Install and start Docker daemon

    yum install docker -y && service docker start

Install kubectl

    curl -O https://s3.us-west-2.amazonaws.com/amazon-eks/1.24.17/2023-11-14/bin/linux/amd64/kubectl
    chmod +x kubectl
    mv kubectl /usr/local/bin/kubectl

Install Kind on Linux

    curl -Lo ./kind https://kind.sigs.k8s.io/dl/v0.14.0/kind-linux-amd64
    chmod +x ./kind
    sudo mv ./kind /bin/kind

Create a kind cluster with extraPortMappings and node-labels.

extraPortMappings allow the local host to make requests to the Ingress controller over ports 80/443 node-labels only allow the ingress controller to run on a specific node(s) matching the label selector

    cat <<EOF | kind create cluster --config=-
    kind: Cluster
    apiVersion: kind.x-k8s.io/v1alpha4
    nodes:
    - role: control-plane
      kubeadmConfigPatches:
      - |
        kind: InitConfiguration
        nodeRegistration:
          kubeletExtraArgs:
            node-labels: "ingress-ready=true"
      extraPortMappings:
      - containerPort: 80
        hostPort: 80
        protocol: TCP
      - containerPort: 443
        hostPort: 443
        protocol: TCP
    - role: worker
    - role: worker
    EOF

The output shows the progress of the operation. When the cluster successfully initiates, the command prompt appears.

    kubectl get nodes
    NAME                 STATUS   ROLES           AGE   VERSION
    kind-control-plane   Ready    control-plane   47s   v1.24.0
    kind-worker          Ready    <none>          26s   v1.24.0
    kind-worker2         Ready    <none>          26s   v1.24.0

Step 2: Deploy nginx Ingress controller

    $ kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/deploy/static/provider/kind/deploy.yaml
    
    $ kubectl wait --namespace ingress-nginx \
      --for=condition=ready pod \
      --selector=app.kubernetes.io/component=controller \
      --timeout=90s
    
    ...
    
    pod/ingress-nginx-controller-6f9b5dd966-zkj2c condition met

Step 3 : Deploy and test sample application

apply ingress test manifests

    kubectl apply -f https://raw.githubusercontent.com/tushardashpute/kind-springboot/main/springboot-deployment.yaml
    kubectl apply -f https://raw.githubusercontent.com/tushardashpute/kind-springboot/main/springboot-service.yaml
    kubectl apply -f https://raw.githubusercontent.com/tushardashpute/kind-springboot/main/springboot-ingress.yaml

Check the pod,service,ingress

    kubectl get ing,svc,pod
    NAME                                           CLASS    HOSTS           ADDRESS     PORTS   AGE
    ingress.networking.k8s.io/springboot-ingress   <none>   ingress.local   localhost   80      12m
    
    NAME                 TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)     AGE
    service/kubernetes   ClusterIP   10.96.0.1     <none>        443/TCP     21m
    service/springboot   ClusterIP   10.96.10.44   <none>        33333/TCP   8s
    
    NAME                              READY   STATUS    RESTARTS   AGE
    pod/springboot-746db777fb-wlb2k   1/1     Running   0          18m

Now we can access application by either locally or by using node public IP:

    [root@ip-172-31-86-22 ~]# curl http://localhost/listallcustomers
    [{"name":"vamsi","id":"001","country_of_birth":"INDIA","country_of_residence":"AP","segment":"retail"}]

To access the app from browser open port 80: