Services on Support Tools

Run Your Python Script as a Linux Daemon: A Step-by-Step Guide

Sun, 15 Jun 2025 00:00:00 -0500

Do you have a Python script that needs to run continuously in the background? Converting your script into a Linux daemon ensures it operates reliably without manual intervention. In this guide, we’ll walk you through the process of turning your Python script into a systemd service, allowing it to run as a daemon on your Linux system.

Leveraging Kubernetes Endpoints to Connect to External Services

Wed, 23 Apr 2025 00:00:00 -0500

Learn how Kubernetes Endpoints facilitate communication between your in-cluster applications and services residing outside the Kubernetes environment.

CKA Prep: Part 4 – Services & Networking

Fri, 04 Apr 2025 00:00:00 +0000

Kubernetes Networking Fundamentals

Kubernetes networking can be complex, but understanding it is crucial for the CKA exam. This section covers essential Kubernetes networking concepts.

Kubernetes Network Model

The Kubernetes network model imposes the following requirements:

Pod-to-Pod Communication: All pods can communicate with all other pods without NAT
Node-to-Pod Communication: Nodes can communicate with all pods without NAT
Pod-to-Node Communication: Pods can communicate with all nodes without NAT

These requirements are implemented by Container Network Interface (CNI) plugins like Calico, Cilium, Flannel, and others.

Deep Dive: Kubernetes Proxy (kube-proxy)

Wed, 01 Jan 2025 00:00:00 -0500

Kube-proxy is responsible for implementing the Kubernetes Service concept, providing network proxying and load balancing. This deep dive explores its architecture, proxy modes, and internal workings.

Avoiding Service Port Mismatches in Kubernetes

Wed, 21 Aug 2024 00:00:00 -0500

Similarly, it’s important to make sure your services route traffic to the correct port on your Pods. Incorrect service port definitions can make it look like a Pod has failed, when in fact your traffic simply isn’t reaching it.

The following manifest contains an example of this problem. The service listens on port 9000 and forwards traffic to port 8080 on its Pods, but the container actually expects traffic to hit port 80:

yaml
apiVersion: v1
kind: Pod
metadata:
 name: demo-pod
 labels:
 app: demo-app
spec:
 image: nginx:latest
 ports:
 - containerPort: 80

---

apiVersion: v1
kind: Service
metadata:
 name: demo-service
spec:
 ports:
 - port: 9000
 protocol: TCP
 targetPort: 8080
 selector:
 app: demo-app

How CoreDNS and NodeLocal DNSCache Work in Kubernetes

Fri, 03 Feb 2023 01:02:00 -0600

DNS is how pods find Services and the outside world. This post explains the actual path a DNS query takes in a Kubernetes cluster, what CoreDNS and NodeLocal DNSCache each do, and how to verify every hop when something breaks.

Kubernetes Networking: Understanding the Basics

Thu, 02 Feb 2023 23:38:00 -0600

Kubernetes is an open-source platform that automates the deployment, scaling, and management of containerized applications. As an infrastructure platform, Kubernetes is responsible for many tasks, including networking. In this article, we’ll cover the basics of Kubernetes networking and how it works.