No container Instances were found in your cluster

 In the context of AWS, here are the appropriate steps given for how you can troubleshoot and resolve this particular issue:-

Verifying cluster status

You can use the command “kubectl get nodes” to check if your cluster nodes are up and running.

Checking deployment status

You can use the “kubectl get deployment” so that you can ensure your deployment is successfully created.

Inspect pod status

You can use the “kubectl get pods” for listing all the pods in the cluster.

Examine container logs

You can use the “kubectl logs ” to view container logs and identifying any runtime errors or failures.

Checking node resources

You can use the “kubectl describe node ” to inspect node resources and ensure they are sufficient for running containers.

Here is an example given of how you can troubleshoot the issue by using python programming language:-

From kubernetes import client, config

Import time

Def check_cluster_status():

    Config.load_kube_config()

    V1 = client.CoreV1Api()

    Print(“Listing nodes with their status:”)

    Ret = v1.list_node()

    For node in ret.items:

        Print(f”Node Name: {node.metadata.name}, Status: {node.status.conditions[0].status}”)

Def check_deployment_status(deployment_name):

    Config.load_kube_config()

    V1 = client.AppsV1Api()

    Try:

        Deployment = v1.read_namespaced_deployment(deployment_name, “default”)

        Print(f”Deployment {deployment_name} found. Status: {deployment.status.conditions[0].status}”)

    Except client.exceptions.ApiException as e:

        Print(f”Error: {e}”)

Def troubleshoot_no_instances(deployment_name):

    Print(“Starting troubleshooting…”)

    Check_cluster_status()

    Check_deployment_status(deployment_name)

    Print(“Checking pod status…”)

    Config.load_kube_config()

    V1 = client.CoreV1Api()

    Ret = v1.list_pod_for_all_namespaces(watch=False)

    For pod in ret.items:

        If pod.metadata.labels.get(“app”) == deployment_name:

            Print(f”Pod Name: {pod.metadata.name}, Status: {pod.status.phase}, Node: {pod.spec.node_name}”)

            If pod.status.phase == “Pending”:

                Print(“Pod is in Pending state. Checking events…”)

                Check_pod_events(pod.metadata.name)

Def check_pod_events(pod_name):

    Config.load_kube_config()

    V1 = client.CoreV1Api()

    Ret = v1.list_namespaced_event(“default”)

    For event in ret.items:

        If event.involved_object.kind == “Pod” and event.involved_object.name == pod_name:

            Print(f”Event Type: {event.type}, Message: {event.message}”)

If __name__ == “__main__”:

    Deployment_name = “example-deployment”

    Troubleshoot_no_instances(deployment_name)

Here is the same example given by using java programming language:-

Import io.kubernetes.client.ApiClient;

Import io.kubernetes.client.ApiException;

Import io.kubernetes.client.Configuration;

Import io.kubernetes.client.apis.AppsV1Api;

Import io.kubernetes.client.apis.CoreV1Api;

Import io.kubernetes.client.models.*;

Public class KubernetesTroubleshooter {

    Public static void main(String[] args) {

        String deploymentName = “example-deployment”;        Try {

            // Set up the Kubernetes client

            ApiClient client = io.kubernetes.client.util.Config.defaultClient();

            Configuration.setDefaultApiClient(client);

            // Check cluster nodes status

            checkClusterStatus();

            // Check deployment status

            checkDeploymentStatus(deploymentName);

            // Troubleshoot no instances issue

            troubleshootNoInstances(deploymentName);

        } catch (Exception e) {

            System.out.println(“Error occurred: “ + e.getMessage());

        }

    }

    Public static void checkClusterStatus() throws ApiException {

        CoreV1Api api = new CoreV1Api();

        V1NodeList nodeList = api.listNode(null, null, null, null, null, null, null, null, null);

        System.out.println(“Listing nodes with their status:”);

        For (V1Node node : nodeList.getItems()) {

            System.out.println(“Node Name: “ + node.getMetadata().getName() + “, Status: “ +

                    Node.getStatus().getConditions().get(0).getStatus());

        }

    }

    Public static void checkDeploymentStatus(String deploymentName) throws ApiException {

        AppsV1Api api = new AppsV1Api();

        V1Deployment deployment = api.readNamespacedDeployment(deploymentName, “default”, null, null, null);

        System.out.println(“Deployment “ + deploymentName + “ found. Status: “ +

                Deployment.getStatus().getConditions().get(0).getStatus());

    }

    Public static void troubleshootNoInstances(String deploymentName) throws ApiException {

        System.out.println(“Starting troubleshooting…”);

        CoreV1Api api = new CoreV1Api();

        V1PodList podList = api.listPodForAllNamespaces(null, null, null, null, null, null, null, null, null);

        For (V1Pod pod : podList.getItems()) {

            If (deploymentName.equals(pod.getMetadata().getLabels().get(“app”))) {

                System.out.println(“Pod Name: “ + pod.getMetadata().getName() + “, Status: “ +

                        Pod.getStatus().getPhase() + “, Node: “ + pod.getSpec().getNodeName());

                If (“Pending”.equals(pod.getStatus().getPhase())) {

                    System.out.println(“Pod is in Pending state. Checking events…”);

                    checkPodEvents(pod.getMetadata().getName());

                }

            }        }

    }

    Public static void checkPodEvents(String podName) throws ApiException {

        CoreV1Api api = new CoreV1Api();        V1EventList eventList = api.listNamespacedEvent(“default”, null, null, null, null, null, null, null, null);

        For (V1Event event : eventList.getItems()) {

            If (“Pod”.equals(event.getInvolvedObject().getKind()) && podName.equals(event.getInvolvedObject().getName())) {

                System.out.println(“Event Type: “ + event.getType() + “, Message: “ + event.getMessage());

            }

        }

    }

}

Here Is the same example given in HTML:-

    <meta</span> charset=”UTF-8”>

    <meta</span> name=”viewport” content=”width=device-width, initial-scale=1.0”>

   

    Kubernetes Cluster Monitoring Dashboard

        Cluster Status

        Troubleshoot Issues

        Pod Details

    [removed]

        // Add your JavaScript code here

        Function troubleshootIssues() {

            // Perform troubleshooting actions using JavaScript fetch API or AJAX

            Fetch(‘/troubleshoot’)

            .then(response => response.json())

            .then(data => {

                // Update UI with troubleshooting results

                Document.getElementById(‘nodeStatus’).textContent = `Node Status: ${data.nodeStatus}`;

                Document.getElementById(‘deploymentStatus’).textContent = `Deployment Status: ${data.deploymentStatus}`;

                Const podList = document.getElementById(‘podList’);

                podList[removed] = ‘’; // Clear previous pod list

                data.podDetails.forEach(pod => {

                    const listItem = document.createElement(‘li’);

                    listItem.textContent = `Pod Name: ${pod.name}, Status: ${pod.status}, Node: ${pod.node}`;

                    podList.appendChild(listItem);

                });

            })

            .catch(error => {

                Console.error(‘Error:’, error);

            });

        }

    [removed]