Python script to track the health of Kubernetes pods

Creating a Python script to track the health of Kubernetes pods involves interacting with Kubernetes’ APIs to monitor and report on pod status. This article provides a detailed guide on building such a script.

1. Introduction

Monitoring Kubernetes pod health is crucial for ensuring the reliability and performance of applications running in a Kubernetes cluster. Python, with its rich ecosystem and Kubernetes’ API, is an excellent tool for building such monitoring solutions.

2. Prerequisites

• A Kubernetes cluster set up and accessible.
• kubectl command-line tool installed and configured.
• Python installed on your system (Python 3.x is recommended).
• Basic knowledge of Python programming and Kubernetes concepts.

3. Python Libraries

• kubernetes: Python client for Kubernetes.
• time: To handle time-related tasks.

4. Installing the Kubernetes Python Client

First, install the Kubernetes Python client using pip:

pip install kubernetes

5. Writing the Script

5.1 Importing Libraries

from kubernetes import client, config
import time

5.2 Configuring Kubernetes Client

config.load_kube_config()  # Loads kubeconfig from ~/.kube/config
v1 = client.CoreV1Api()

5.3 Defining the Pod Health Monitoring Function

def monitor_pod_health(namespace='default', interval=10):
    print(f"Monitoring pods in namespace: {namespace}")
    while True:
        pods = v1.list_namespaced_pod(namespace)
        for pod in pods.items:
            status = pod.status.phase
            print(f"Pod: {pod.metadata.name}, Status: {status}")
        time.sleep(interval)

5.4 Main Function

def main():
    namespace = input("Enter Kubernetes namespace to monitor (default: 'default'): ") or 'default'
    monitor_pod_health(namespace)
if __name__ == "__main__":
    main()

The script will periodically display the status of each pod in the specified Kubernetes namespace, helping you track their health.

Kubernetes Python Client documentation

Kubernetes’ official documentation

Python’s official documentation

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