carlosgrillet

# Legend:
# <tool_name> the name of your binary, e.g. gotool
# <owner>     the owner of the tool repository, e.g. privGo
# <repo>      the tool repository
# <tap_owner> the owner of the homebrew tap repository
# <tap>       the name of the homebrew tap
# <license>   the license of your tool
# <project_description> description of your tool
#
# Example:

carlosgrillet

Fedora Service Deployment Guide

1. System User Setup

Never run a service as root or a standard login user. Create a dedicated system user.

# -r: System account (no aging, UID in system range)
# -s /sbin/nologin: No interactive login shell for security
# -U: Create a group with the same name as the user
# -m -d: Create and set the home directory
sudo useradd -rs /sbin/nologin -Umd /var/lib/myservice myservice

carlosgrillet

Rust Ownership: The Complete Mental Model

Rust rules are simple to understand but can confusing to implement.

Part 1: ELI5 (Explain Like I'm 5)

The Apartment Analogy

Think of every value in Rust as a physical apartment key — not a copy, the only key.

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,

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

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

packages:
  - wget
  - gzip

carlosgrillet

strace - System Call Tracer

Synopsis

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

---

carlosgrillet

📂 File & Directory Operations

ls: List directory contents

$ ls
Desktop  Documents  Downloads

cp: Copy files or directories

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

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?