Mahdad Ghasemian MahdadGhasemian

VMware Recovery and Independent Cloning

Two guides for VMware Workstation VMs:

Recover a damaged VM — vmware-vm-recovery.md: recover a disk/snapshot chain that QEMU can still read. This is not a universal corruption repair.
Create an independent clone — independet-vm-clone.md: consolidate the selected disk state into an independent VMDK, create a new VM, and update Ubuntu's identity.

Use the recovery guide when the existing VM has disk problems. Use the cloning guide when the disk chain is readable and you want a separate VM. After recovery, you can also use the cloning guide to create another independent VM.

Before either procedure: fully shut down the source VM, close VMware, and preserve the original files until the resulting VM is verified.

Kubernetes Certificate Renewal Guide

Problem

Kubernetes certificates expire, causing kubectl connection failures and API errors. Unlike TLS verification skipping (which only bypasses server checks), expired administrator and client certificates prevent cluster access entirely.

Solution Overview

Renew certificates using kubeadm on each control-plane node. Since CA certificates remain valid until 2035, you only need to renew the signed certificates. This process temporarily interrupts the API on each node.

Install `Chinese` keyboard layout and activate it

On Ubuntu, install the IBus Chinese engine:

sudo apt update
sudo apt install ibus-libpinyin

How to prepare for blindness ?

VMware

Disable all keyboard's shortcut on host os

Voice Assistant and Screen Readers (Ubuntu 24 26)

Open Selected Folder in VS Code from Nautilus (Ubuntu)

A simple Nautilus script to add an "🔷 Open in VS Code" option to the right-click menu.

This works without installing any extra extensions or Python packages.

Features

✅ Open a selected folder directly in VS Code
✅ Right-click a file → open its parent folder in VS Code

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

🌐 APT Proxy

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

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.

1. Create a Session

Start a named session so you can easily reattach later:

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

Download Postman from: Postman x86_64
Extract it:

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

Move to /opt

	#!/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