MahdadGhasemian

#!/bin/bash

DATE=$(date +"%Y%m%d")
BACKUP_DIR="/backup/mysql"
BACKUP_ARCHIVE_DIR="/backup/mysql_archive"
LOG_DIR="/backup/backup_logs"
MYSQL_USER="backup_user"
MYSQL_PASSWORD="tr -cd 'a-zA-Z0-9' </dev/urandom | head -c '65' ; echo '@'"
MYSQL=/usr/bin/mysql
MYSQLDUMP=/usr/bin/mysqldump

MahdadGhasemian

Working in Restricted Networks: Proxies, APT, Docker & Offline Installs

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🌐 APT Proxy

⚠️ TODO: Add configuration for HTTP/HTTPS proxy in APT (/etc/apt/apt.conf.d/)

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MahdadGhasemian

Screen: Never Lose a Process Again

If you’ve ever started a long-running task—like a database migration— only to have your terminal or SSH connection drop, screen is your lifesaver. It keeps processes running in the background so you don’t have to babysit your terminal.

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1. Create a Session

Start a named session so you can easily reattach later:

MahdadGhasemian

Iranian DNS servers list (domestic)

DNS Server	Status
217.218.155.155	OK
217.218.127.127	OK
46.209.209.209	FAILED
185.161.112.33	OK

MahdadGhasemian

1. Download Postman from: Postman x86_64

2. Extract it:

tar -xzf ./postman-linux-x64.tar.gz

3. Move to /opt

MahdadGhasemian

Secure External SSD

Make your external SSD partitions with ext4 filesystem for Linux

To prepare your external SSD for use in Linux, you can use the following tools:

• Use lsblk or fdisk -l to identify your external SSD device.
• Use fdisk or parted to create and manage partitions on the SSD.
• Use mkfs.ext4 to format the created partitions with the ext4 filesystem.
• For a graphical interface, consider using gparted.

MahdadGhasemian

VMware

✅ You can run VMs on your PC/Mac for free

• VMware Workstation & VMware Fusion (Desktop Hypervisors)
• Workstation for Windows/Linux and Fusion for macOS
• These desktop virtualization products are now free for all users — personal, educational, and even commercial.
• The older Pro branded versions are no longer sold as paid products; instead these full-featured tools are available at no cost.
• No subscription or license purchase required
• Official support is not included — only community forums and docs.

MahdadGhasemian

MetalLB: Layer 2 vs BGP Mode Comparison

🎯 Introduction

MetalLB is a load-balancer implementation for bare metal Kubernetes clusters. This document compares its two main operational modes: Layer 2 and BGP, helping you choose the right one for your environment.

🔁 Layer 2 Mode

🏗️ Example Cluster Setup

📦 Cluster Setup

MahdadGhasemian

version: "3.7"

services:
  # Node 0
  redis-node-0:
    image: docker.io/bitnami/redis-cluster:7.4
    volumes:
      - redis_cluster_data_0:/bitnami/redis/data
    environment:
      - "REDIS_PASSWORD=bitnami"

MahdadGhasemian

How to Set Up a stable MongoDB Replica Set Localy for Developing

version: "3.9"

services:
  mongodb-primary:
    image: docker.io/bitnami/mongodb:5.0
    environment:
      - MONGODB_ADVERTISED_HOSTNAME=mongodb-primary