carlosgrillet

How to deploy Traefik in kubernetes

Warning

At this point you should already have access to your kubernetes cluster in the cloud.

Tip

This example was tested on Linode (Akamai Cloud)

To install traefik on kubernetes, we are going to use helm. Follow the link see how to install it on your system, once done, we can now proceed.

carlosgrillet

Kubernetes Resources

API and Registration

1. APIService: Registers API services to extend the Kubernetes API.
2. CustomResourceDefinition (CRD): Defines custom resources, enabling users to create their own resource types.

---

Certificates

3. CertificateSigningRequest (CSR): Manages certificate signing requests for entities needing TLS certificates.

carlosgrillet

1. Generate Certificates

# Generate all certificates at once  
kubeadm init phase certs all  
  
# Or generate them individually:  
kubeadm init phase certs ca                        # Root CA  
kubeadm init phase certs apiserver                 # API server certificate  
kubeadm init phase certs apiserver-kubelet-client  # API server to kubelet client cert  
kubeadm init phase certs front-proxy-ca # Front proxy CA 

carlosgrillet

How to Set Up a Centralized NFS Server for Kubernetes Storage

This guide will walk you through setting up an NFS server to provide centralized storage for your Kubernetes cluster. We'll use a Docker container as the NFS server and configure it to work seamlessly with Kubernetes. This setup is very useful if you have an on-premise Kubernetes cluster and you're looking for a centralized storage solution.

Overview

1. What is NFS?

   • NFS (Network File System) allows you to share files between machines over a network. It's commonly used in Kubernetes to provide persistent storage that can be accessed by multiple pods.

2. Why Use This Setup?

carlosgrillet

How to Set Up HAProxy as a Load Balancer for Kubernetes High Availability (HA) Clusters

This guide explains how to configure HAProxy as a load balancer for Kubernetes clusters.

Why Use a Load Balancer?

A load balancer is important for Kubernetes clusters because:

1. High Availability: It ensures that if one control plane node fails, traffic is redirected to other working nodes.
2. Better Performance: It distributes traffic evenly across multiple nodes, preventing overload on a single node.
3. Simplified Access: Instead of connecting to individual control plane nodes, you can use a single entry point (the load balancer).

carlosgrillet

📂 File & Directory Operations

ls: List directory contents

$ ls
Desktop  Documents  Downloads

cp: Copy files or directories

carlosgrillet

strace - System Call Tracer

Synopsis

strace [OPTIONS] { -p PID | PROG [ARGS] }
strace -c [OPTIONS] { -p PID | PROG [ARGS] }

---

carlosgrillet

# cloud-config
users:
  - name: mikrotik
    groups: sudo
    shell: /bin/bash

packages:
  - wget
  - gzip

carlosgrillet

#!/usr/bin/env bash

set -euo pipefail

if [[ $# -eq 0 ]]; then
  echo "Error: Please provide a project name." >&2
  echo "Usage: $0 <name>" >&2
  exit 1
fi

carlosgrillet

use std::fmt;

struct Node<T> {
    value: T,
    next: Option<Box<Node<T>>>,
}

pub struct List<T> {
    head: Option<Box<Node<T>>>,
    len: usize,