Kubernetes.md

Kubernetes Issues

Kubernetes Issue: Pods Not Reaching READY State

Pods in Kubernetes (k8s) are not reaching the READY state, showing a status of READY 0/1.

Solution

Add a liveness probe to your pod configuration using kubectl.

Detailed Explanation

When a Kubernetes pod shows a status of READY 0/1, it indicates that the pod is running but not ready to receive traffic. This is often due to the readiness probe failing or not being configured.

What is a Readiness Probe?

A readiness probe is used by Kubernetes to determine if a pod is ready to handle traffic. This is crucial for maintaining service availability and load balancing.

Solution Steps:

1. Identify the Health Endpoint: Ensure your application has a health check endpoint (e.g., /health). This endpoint should return a success status when the application is ready to serve traffic.

2. Add Readiness Probe to Pod Configuration:

   • Open your pod configuration YAML file.
   • Add a readiness probe section under the container specification.
   • Specify the probe type (HTTP, TCP, or exec), along with the necessary details like path, port, and initialDelaySeconds.

   Example:

   readinessProbe:
     httpGet:
       path: /health
       port: 80
     initialDelaySeconds: 10
     periodSeconds: 5

3. Apply the Configuration:

   • Use kubectl apply -f <your-pod-config.yaml> to apply the changes.

4. Monitor Pod Status:

   • Use kubectl get pods to monitor the pod status.
   • The READY status should change to 1/1 once the readiness probe is successful.

Note:

• The configuration details may vary based on your application's specific needs.
• Ensure that the probe intervals and thresholds are set according to your application's startup time and performance characteristics.

By implementing a readiness probe, Kubernetes can effectively manage traffic to the pods, ensuring that only healthy instances receive requests.