Article on Notities

Proxmox Lab — Windows Server 2022 Template Preparation

Tue, 31 Mar 2026 10:00:00 +0100

This guide covers the complete process of preparing a freshly installed Windows Server 2022 VM as a reusable Proxmox template. All future VMs (CA server, member servers, etc.) are cloned from this template, saving significant time and ensuring a consistent baseline across the entire lab.

📄 Download the full guide with screenshots: WS2022-in-Proxmox-Template-Preparation-Guide.docx

Overview

The full process consists of these steps:

Install VirtIO guest drivers
Run Windows Update — fully patch the OS
Apply performance tweaks
Basic housekeeping — timezone, RDP, IE Enhanced Security
Sysprep — generalize and shut down
Convert to template in Proxmox

Warning: Never boot the VM after Sysprep. If you do, the generalization is consumed and the template must be rebuilt from scratch.

Proxmox Lab — Creating a Windows Server 2022 VM

Tue, 31 Mar 2026 00:00:00 +0100

This guide documents the complete process of creating a Windows Server 2022 virtual machine in Proxmox VE 9.1.6. It is based on actual lab setup experience and includes all corrections and lessons learned during the build of a home lab.

📄 Download the full guide with screenshots: WS2022-in-Proxmox-VM-Creation-Guide.docx

Environment

Component	Details
Proxmox Host	macpro2013.local — Mac Pro 2013 Trashcan
Proxmox Version	9.1.6
RAM	128 GB
Storage	3.6 TB NVMe (local-lvm pool)
Network Bridge	vmbr0 — internal lab network (192.168.178.x)
Proxmox WebUI	https://192.168.178.205:8006

Note: The Proxmox WebUI shows an SSL certificate warning because Proxmox uses a self-signed certificate by default. This is the motivation for setting up an internal Certificate Authority (CA) later — once the CA is in place, a proper trusted certificate can be issued for Proxmox.

Windows Server 2022 — Active Directory and DNS Installation

Fri, 27 Mar 2026 00:00:00 +0100

In this article I describe step by step how I installed Active Directory Domain Services (AD DS) and DNS on a Windows Server 2022 Datacenter VM in a VMware Fusion lab environment. The result is a fully functional domain controller for the domain lab.local, as the foundation for a Windows DevOps lab.

Environment

Component	Value
Virtualisation	VMware Fusion (macOS)
Guest operating system	Windows Server 2022 Datacenter (Desktop Experience)
Hostname	DC01
Domain name	lab.local
NetBIOS name	LAB
Lab network adapter	Ethernet1 — 172.16.37.10 (static IP)
Internet adapter	Ethernet0 — DHCP via VMware NAT

Step 1 — Configure Networking

Before installing Active Directory, the domain controller needs a static IP address. AD DS and DNS depend on a stable address.

Windows packet capturing for example for an LDAPS traffic analysis

Sun, 18 Jan 2026 18:55:54 +0000

Open a Windows Terminal or Command session As Administrator

Check existing filters
# pktmon filter list

Clear all filters
# pktmon filter remove

Check capture status
# pktmon status

Add a filter for LDAPS
# pktmon filter add -p 636

Start the capture
# pktmon start --etw

Try to connect again to the LDAP server / If you want to monitor a different port, repeat the command that generates the network traffic.

How to activate the VirtualBox web-based API - VBoxWebSrv

Tue, 01 Jul 2025 08:30:05 +0000

VBoxWebSrv is the VirtualBox Web Service that allows you to manage your VirtualBox virtual machines remotely through a web-based API. It is commonly used with tools like phpVirtualBox to provide a full web interface for VM control.

By running VBoxWebSrv as a Windows service, you ensure it starts automatically with your system and runs continuously in the background.

Installing VBoxWebSrv as a Windows Service with NSSM

Download NSSM (Non-Sucking Service Manager) from https://nssm.cc/download and extract it.

This version of BootCamp is not intented for this computer

Mon, 28 Apr 2025 16:04:39 +0000

Dear reader,

Recently I updated my Windows version of my MacBook Pro 16,1 BootCamp setup to Windows 11. Now I ran into the problem that my build in keyboard and trackpad were not working anymore. I had to overcome this issue by connecting a separate keyboard and mouse on a USB port.

I downloaded the software in the BootCamp utility on macOS that is compatible with my laptop, in this case version: Boot Camp drivers 6.1.6655. But when trying to startup the setup.exe I get the following error: This version of boot camp is not intented for this computer.

Microsoft OneNote search not working anymore

Thu, 10 Apr 2025 08:48:17 +0000

Close all Microsoft applications
Rename the cache folder in:
C:\Users\<User>\AppData\Local\Microsoft\OneNote\16.0
Restart OneNote

P.S.
Don’t worry if the Notebooks seem empty, they will be regenerated.

OCLP update gives a circle with diagonal at boot

Fri, 04 Apr 2025 14:27:55 +0000

What Mac are you using?
iMac (Retina 5K, 27-inch, Late 2015)
Model Identifiers: iMac17,1

What version of OCLP are you using?
2.3.1

What OS version do you have installed or are trying to install?
Installed: Sequoia 15.3.2 (24D81)

What exactly is the problem you are facing?
After installing OCLP 2.3.1 to disk my iMac refuses to boot. At boot I press the Option key to get the menu I choose the blue OCLP icon. Normally it proceeds with the apple logo but now it shows a circle with a diagonal.
Luckily with my old USB stick that has OCLP 2.2.0 I booted of my USB. That worked fine. Then I mounted my EFI removed the OC folder and replaced it with the one from my USB stick. So now my iMac boots again but with 2.2.0
Use the tool: MountEFI Available on GitHub: https://github.com/corpnewt/MountEFI

Now I have been able to fix it with the following settings in OCLP:
My iMac is a late 2015 27" with Model nr 17,1

In the OCLP utility in settings I put:
Target Model: 17,1
Build: Debug: Check all 3 options: Verbose, Kext Debugging and OpenCore Debugging
Extra’s: Check: 3rd Party NVMe PM
Security: Check all the options under SIP
SMBIOS: SMBIOS Spoof Level: Moderate and SMBIOS Spoof Model: iMac19,1
Then I Build and Install OpenCore to disk

By the way in the mean time OCLP was updated to 2.3.2 and I used this version.

Installing GitLab on Docker in AlmaLinux 8.10

Sat, 29 Mar 2025 20:21:32 +0000

Step 1: Update System

$ sudo dnf update
$ sudo dnf install epel-release
$ sudo /usr/bin/crb enable

Step 2: Install Docker from AlmaLinux Repo

$ sudo dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
$ sudo dnf remove -y podman podman-docker podman-plugins
$ sudo dnf remove -y runc
$ sudo dnf clean all
$ sudo dnf install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin
$ sudo systemctl enable --now docker
$ sudo systemctl status docker
$ sudo usermod -aG docker $USER

Step 3: Logout and back in

Installing VirtualBox Guest Additions on AlmaLinux 8.10

Sat, 29 Mar 2025 20:16:41 +0000

$ sudo dnf update
$ sudo reboot
(So any new installed kernel will be loaded)

$ sudo dnf install gcc kernel-devel kernel-headers make bzip2 perl

Go to the VirtualBox Menu > Devices > Insert Guest Additions CD image

Automated:
Press Run

Manual:
$ cd /run/media/$USER/VBox_GAs_*/ # Adjust path if needed
$ sudo ./VBoxLinuxAdditions.run

$ sudo reboot

Verification:
$ lsmod | grep vbox
(Check to see if vboxguest is listed)

Deskflow: Control multiple computers with 1 keyboard and mouse for: macOS, Windows and Linux

Mon, 24 Mar 2025 17:57:51 +0000

With Deskflow you control multiple computers — macOS, Windows or Linux — using a single mouse and keyboard. It works as a software-based KVM switch (without video) and is sponsored by Synergy. This program is still actively maintained, with an intuitive interface that makes it easy to use. Tip: disable TLS in the settings for a smooth start.

Download it via: https://github.com/deskflow/deskflow/releases. Look for the “latest” tag and check all assets for the correct version!

Installing Oracle VirtualBox on Ubuntu Linux

Sun, 23 Mar 2025 13:20:53 +0000

Try the following steps:

$ sudo apt update
$ sudo apt upgrade
$ sudo apt install curl
$ curl -fsSL https://www.virtualbox.org/download/oracle_vbox_2016.asc | sudo gpg –dearmor -o /usr/share/keyrings/virtualbox-archive-keyring.gpg
$ echo “deb [arch=amd64 signed-by=/usr/share/keyrings/virtualbox-archive-keyring.gpg] http://download.virtualbox.org/virtualbox/debian noble contrib” | sudo tee /etc/apt/sources.list.d/virtualbox.list
$ sudo apt update
$ sudo search virtualbox

virtualbox/noble-updates 7.0.16-dfsg-2ubuntu1.1 amd64 x86 virtualization solution - base binaries

virtualbox-7.0/unknown 7.0.24-167081~Ubuntu~noble amd64 Oracle VM VirtualBox

virtualbox-7.1/unknown 7.1.6-167084~Ubuntu~noble amd64 Oracle VirtualBox

$ sudo install virtualbox-7.1

Download the Extension Pack frm the website: https://www.virtualbox.org/wiki/Downloads

Tips for using XRDP on Ubuntu Linux

Sun, 23 Mar 2025 12:51:59 +0000

To be able to use XRDP on Ubuntu Linux try the following instructions:

$ sudo apt update
$ sudo apt upgrade
$ sudo apt install xrdp
$ echo “gnome-session –session=ubuntu” > ~/.xsession
$ echo “export DISPLAY=:10.0” > ~/.bash_profile
$ echo “xhost +” > ~/.bash_profile
$ ip a

Remember write down your IP address of your system and to log out of your graphical user session.

Now try to login to your system with a RDP tool.

Install Microsoft Visual Studio Code in Linux from the repo

Sat, 22 Mar 2025 22:13:54 +0000

Follow the below steps to install Microsoft Visual Studio Code IDE on Linux from its repository:

sudo rpm –import https://packages.microsoft.com/keys/microsoft.asc

sudo sh -c ’echo -e “[code]\nname=Visual Studio Code\nbaseurl=https://packages.microsoft.com/yumrepos/vscode\nenabled=1\ngpgcheck=1\ngpgkey=https://packages.microsoft.com/keys/microsoft.asc” > /etc/yum.repos.d/vscode.repo'

sudo dnf install code -y

Use of Golang, Java, C/C++, or Rust: A Quick Guide

Sat, 22 Mar 2025 19:32:21 +0000

For real-time applications, Go and Rust are the top choices due to their lightweight concurrency and memory efficiency. Combine them for a balanced approach: Go for high-level logic and Rust for performance-critical tasks. Use C/C++ for legacy systems and Java for enterprise-level applications where real-time performance is less critical.

When using Go, the chance of classic concurrency errors like race conditions, deadlocks, and resource leaks is significantly reduced. This is thanks to Go’s use of channels for safe communication between goroutines and its built-in garbage collector, which works seamlessly with the goroutine scheduler. This makes Go not only efficient but also more reliable and easier to debug in high-concurrency scenarios.

Create support on your website for dark mode capability with a subtle icon

Sat, 15 Feb 2025 21:17:06 +0000

Dear reader,

I would like to refer you to my GitHub page for a nice and simple project enabling the dark mode effect on a website. I want to share this with you so that it can inspire you and enable you to do a similar implementation that you can use on your own website.

See: https://github.com/martijnvandenboom/darkmode-test

Best regards,

Martijn

P.S. leave a message I would like to hear from from you

Java convert a variabele for it to be printed in a price format related to country settings

Sun, 05 Jan 2025 20:09:27 +0000

For Dutch Euro use: .getCurrencyInstance(new Locale(“nl”, “NL”))

For Swiss Franc use: .getCurrencyInstance(new Locale(“de”, “CH”))

import java.text.NumberFormat;
import java.util.Locale;


public class prog_002_variables {
 
 public static void main(String[] args){

 String message;
 int year;
 double prijs;

 message = "De beste wensen voor: ";
 year = 2025;
 prijs = 2.50;

 // Combine the creation of the Locale and the NumberFormat in one line
 NumberFormat currencyFormat;
 
 currencyFormat = NumberFormat.getCurrencyInstance(new Locale("nl", "NL"));
 System.out.println(message + year + ", een frikandel kost nu: " + currencyFormat.format(prijs));

 currencyFormat = NumberFormat.getCurrencyInstance(new Locale("de", "CH"));
 System.out.println(message + year + ", een frikandel kost nu: " + currencyFormat.format(prijs));

 }

}

Quick git commands to add a local repository in Visual Studio Code to GitHub

Fri, 03 Jan 2025 22:23:19 +0000

Type in the terminal of Visual Studio Code

# git init
# git add .
# git commit -m “initial commit”

Create a new repository on GitHub

# git remote add origin <the new .git URL>
Example: # git remote add orign https://github.com/martijnvandenboom/Java_tools.git
# git push -u origin main

Find the name of your USB stick with a script

Thu, 18 Jul 2024 07:20:59 +0000

You can use this script to retrieve the name of your USB stick.
The name of your USB stick can be used in Apple’s sudo command to create a USB installer.

Step 1: Open the Terminal application
Step 2: Go to your home directory, type: # cd
Step 3: Optionally create a scripts directory, type: # mkdir scripts
Step 4: Navigate to the newly created scripts directory, type: # cd scripts
Step 5: Create a bash script, type: # vim usbstick.sh
Step 6: Insert the following code:

Putting the Microsoft EFI boot files on the EFI partition

Sun, 07 Jul 2024 20:49:33 +0000

Boot into the Windows installer

On the first screen press SHIFT + F10


# diskpart
# list disk
# select disk 0
# list part
Look for the Windows partition

# select part 3
# assign letter=W
# format quick fs=NTFS
# list volume
Look for the EFI volume

# select volume 2
# assign letter=Z
# exit

# D:
Goto the USB installer of Windows
# cd D:\sources
# dir install*
The file install.esd exists

# dism /Get-WimInfo /WimFile:D:\Sources\install.esd
Select the Index of the version of Windows you want

# dism /Apply-image /ImageFile:D:\Sources\install.esd /index:6 /ApplyDir:W:\
# bcdboot W:\Windows /l en-us /s Z: /f UEFI
Shutdown your computer and remove the USB installer
Now we have the Microsoft EFI boot files in the EFI partition in its designated folder

Follow the normal procedure of installing Windows

Create a USB rEFIt boot disk

Sun, 07 Jul 2024 20:45:53 +0000

# hdiutil convert /path/to/refit-0.14.cdr -format UDRW -o /path/to/refit-0.14.img
# diskutil list
# diskutil unmountDisk /dev/disk2
# sudo dd if=/path/to/refit-0.14.img.dmg of=/dev/rdisk2 bs=1m
Using rdisk2 here seems to speed up things

# diskutil eject /dev/disk2

rEFIt installation to EFI partition of an iMac

Thu, 27 Jun 2024 22:27:46 +0000

Follow the steps below to install rEFIt to the EFI partition of an iMac

Download rEFIt and copy the efi folder to the /efi folder as explained below

Before you do the bless command disable the SIP
Boot in recovery mode
# csrutil status
# csrutil disable
# reboot

sudo mkdir /efi

sudo mount -t msdos /dev/disk0s1 /efi

sudo bless --mount /efi --setBoot --file /efi/EFI/refit/refit.efi --labelfile /efi/EFI/refit/refit.vollabel

SSH in remote machine with SSH keys and run command in new Python 3

Wed, 03 Apr 2024 20:20:39 +0000

To make a script to run remote commands in a client server network.

import subprocess

def ssh_exec_command(hostname, username, command):
 ssh_cmd = ['ssh', f'{username}@{hostname}', command]
 ssh_process = subprocess.Popen(
 ssh_cmd,
 stdin=subprocess.PIPE,
 stdout=subprocess.PIPE,
 stderr=subprocess.PIPE,
 text=True
 )
 output, error = ssh_process.communicate()

 if error:
 print("Error:", error)
 else:
 print("Output:", output)

# Replace these with your actual credentials and command
hostname = 'remote_host_address'
username = 'your_username'
command = 'ls -l'

ssh_exec_command(hostname, username, command)

SSH in remote machine with SSH keys and run command in old Python 2

Wed, 03 Apr 2024 20:12:58 +0000

In case you have an old legacy system with Python 2 still in use and want to make a script to run certain commands in a client server network.

import subprocess

def ssh_exec_command(hostname, username, private_key_path, command):
 ssh_cmd = ['ssh', '-i', private_key_path, '-o', 'StrictHostKeyChecking=no', f'{username}@{hostname}', command]
 ssh_process = subprocess.Popen(
 ssh_cmd,
 stdin=subprocess.PIPE,
 stdout=subprocess.PIPE,
 stderr=subprocess.PIPE
 )
 output, error = ssh_process.communicate()

 if error:
 print("Error:", error)
 else:
 print("Output:", output)

# Replace these with your actual credentials and command
hostname = 'remote_host_address'
username = 'your_username'
private_key_path = '/path/to/your/private_key'
command = 'ls -l'

ssh_exec_command(hostname, username, private_key_path, command)

Configure LDAP/IPA Server with Jenkins

Sat, 09 Mar 2024 17:38:50 +0000

===

Identity, Policy, and Audit (IPA) system

===

Jenkins

2.319.2

===

Dashboard -> Security -> Configure Global Security

Server:

ldap://<IP_SERVER>:389

root DN:

dc=,dc=com

User search base

cn=users,cn=accounts

User search filter

uid={0}

Group search base

cn=groups,cn=accounts

Group membership -> Search for LDAP groups containing user -> Group membership filter:

(| (member={0}) (uniqueMember={0}) (memberUid={1}))

Manager DN:

uid=<ADMIN_USER>,cn=users,cn=accounts,dc=,dc=com

Configure LDAP/IPA Server with Nexus

Sat, 09 Mar 2024 17:37:42 +0000

===

Nexus

Sonatype Nexus Repository

OSS 3.60.0-02

===

LDAP

ldap://<IP_SERVER>:389

cn=users,cn=accounts,dc=,dc=com

Simple Authentication

uid=<ADMIN_USER>,cn=users,cn=accounts,dc=,dc=com

===

Select no template

User relative DN = leeg

User subtree = unchecked

Object class: inetOrgPerson

User filter = leeg

User ID attribute = uid

Real name attribute = cn

Email attribute = mail

Password attribute = leeg

Map LDAP groups as roles = unchecked

Configure LDAP/IPA Server with Sonarqube

Sat, 09 Mar 2024 17:35:22 +0000

Configure LDAP/IPA Server with Sonarqube

===

Sonarqube

8.9.6

sonar.properties

sonarqube-8.9.6/conf/sonar.properties

===

sonar.security.realm=LDAP

ldap.url=ldap://<IP_SERVER>:389

ldap.bindDn=uid=<ADMIN_USER>,cn=users,cn=accounts,dc=,dc=com

ldap.bindPassword=

ldap.authentication=simple

ldap.user.baseDn=cn=users,cn=accounts,dc=,dc=com

# laat volgende default

# ldap.user.request=

# LDAP user request. (default: (&(objectClass=inetOrgPerson)(uid={login})) )

ldap.group.baseDn=cn=groups,cn=accounts,dc=,dc=com

# laat volgende default

# ldap.group.request=

# LDAP group request (default: (&(objectClass=groupOfUniqueNames)(uniqueMember={dn})) )

LDAP/IPA Server command line searches

Sat, 09 Mar 2024 17:34:27 +0000

$ ldapsearch -H ldap://<FQDN_SERVER>/ -b dc=,dc=com -x

$ ldapsearch -x -LLL -H ldap:/// -b dc=,dc=com dn

$ ldapwhoami -x -H ldap:///

$ ldapsearch -H ldap://<IP_SERVER> -D “uid=<ADMIN_USER>,cn=users,cn=compat,dc=,dc=com” -b “cn=users,cn=accounts,dc=,dc=com” -x -W

$ ldapsearch -H ldap://<IP_SERVER> -D “uid=<ADMIN_USER>,cn=users,cn=compat,dc=,dc=com” -b “dc=,dc=com” -x -W -s one “(&(objectClass=organizationalUnit)

$ ldapsearch -h <FQDN_SERVER> -D ‘uid=<ADMIN_USER>,cn=users,cn=compat,dc=,dc=com’ -o ldif-wrap=no -b ‘dc=,dc=com’ -W uid=<ADMIN_USER>

$ ldapsearch -h <FQDN_SERVER> -D ‘uid=,cn=users,cn=compat,dc=,dc=com’ -o ldif-wrap=no -b ‘dc=,dc=com’ -W uid=

LDAP/IPA Server client installation

Sat, 09 Mar 2024 17:33:26 +0000

===

# yum install ipa-client

# ipa-client-install –server= –domain= –principal=admin -W

# ipa-client-install –server=<ipa-server.example.com> –domain=<example.com> –principal=admin -W

LDAP/IPA Server installation

Sat, 09 Mar 2024 17:31:40 +0000

===

# yum install ipa-server

# ipa-server-install

===

Hosts file aanpassen

De FQDN voor op, daarna pas de aliassen

/etc/hosts

<IP_SERVER> ()

Mocht er een alias voor de FQDN staan, dan kun je foutmeldingen krijgen die hier niet meteen aan te relateren zijn.

LDAP/IPA - Server on Red Hat Enterprise Linux 7

Thu, 15 Feb 2024 10:47:28 +0000

If you are using a hosts file, make sure it contains FQDNs and pay close attention to the order in which they appear.

Check the hosts file and adjust it if necessary:

The FQDN must come first, followed by any aliases.

/etc/hosts

10.0.0.1 server1.example.com server1 application1

If an alias is listed before the FQDN, you may encounter error messages that are not immediately traceable to this cause.

Create a Zombie process in Linux using a C program

Wed, 31 Jan 2024 20:54:45 +0000

Below is the source code of a C program to create a Zombie process in Linux and analyse it.

vim create_zombie_process.c

#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

int main ()
{
 pid_t child_pid;

 child_pid = fork ();
 if (child_pid > 0) {
 sleep (60);
 }
 else {
 exit (0);
 }
 return 0;
}

Compile the C source code into an executable program:

gcc create_zombie_process.c

Start the program:

./a.out

Open a second Terminal and view the process list. You will now see a process with STAT: Z and the text: defunct

Bash script with a SUCCESS or FAILED message at the end of the line

Wed, 31 Jan 2024 20:18:39 +0000

See below an example script to display a SUCCESS message in green or a FAILED message in red, right-aligned at the end of the line.

#!/bin/bash

# Set the message
success_message="Your command was successful"
failed_message="Your command failed"

# Set the "OK" string in green
ok="$(tput setaf 2)[SUCCES]$(tput sgr0)"
failed="$(tput setaf 1)[FAILED]$(tput sgr0)"

# Get the width of the terminal
term_width=$(tput cols)+9

# Calculate the number of dots needed
success_dots_count=$((term_width - ${#success_message} - ${#ok}))
failed_dots_count=$((term_width - ${#failed_message} - ${#failed}))

# Create a string of dots for success and failed messages
success_dots=$(printf "%0.s." $(seq 1 $success_dots_count))
failed_dots=$(printf "%0.s." $(seq 1 $failed_dots_count))

# Print the success message with dots and "OK" at the end of the line
printf "%s%s%s\n" "$success_message " "$success_dots" " $ok"

# Print the failed message with dots and "FAILED" at the end of the line
printf "%s%s%s\n" "$failed_message " "$failed_dots" " $failed"

Checkmk installation on Rocky Linux 9.3

Tue, 16 Jan 2024 21:13:15 +0000

Checkmk installation on Rocky Linux 9.3

dnf install epel-release

setsebool -P httpd_can_network_connect 1

firewall-cmd --zone=public --add-service=http --permanent
firewall-cmd --reload

wget https://download.checkmk.com/checkmk/2.2.0p18/check-mk-raw-2.2.0p18-el9-38.x86_64.rpm
yum install check-mk-raw-2.2.0p18-el9-38.x86_64.rpm

omd version
omd create monitoring
omd start monitoring

http://localhost.localdomain/monitoring/
user: cmkadmin with password: <given>

omd su monitoring (For command line administration of the site.)
cmk-passwd cmkadmin (After logging in, you can change the password for cmkadmin with.)

(optional)
omd status
omd sites
omd help

(optional for after reboot if you get the error: Unable to connect)
omd update-apache-config monitoring

Installing the VirtualBox Guest Additions on Rocky Linux 9.3

Tue, 16 Jan 2024 21:08:26 +0000

Installing the VirtualBox Guest Additions on Rocky Linux 9.3

dnf install epel-release
dnf update --refresh
dnf update kernel-*
reboot (optional)

dnf install dkms kernel-devel kernel-headers gcc make bzip2 perl elfutils-libelf-devel

rpm -q kernel-devel
uname -r

Top menu: Devices -> Insert Guest Additions CD-Image
Run

(optional)
cd /run/media/
./VBoxLinuxAdditions.run

PowerShell computer resource monitor script with cpu percentage and advanced memory information

Thu, 04 Jan 2024 22:21:38 +0000

PowerShell computer resource monitor script with cpu percentage and advanced memory information

PowerShell

Resource monitor 


 $app="notepad"
 $ids = Get-Process $app | Select-Object -Property Id | ForEach-Object {$_.Id}

 $filedate = Get-Date -format "yyyy-MM-dd"

 #echo $pids

 foreach ($id in $ids) {
 
 $date = Get-Date -format "yyyy-MM-dd HH:mm:ss"

 # process CPU information

 $ProcessId = $id
 $Process = Get-WmiObject -Query "SELECT * FROM Win32_PerfFormattedData_PerfProc_Process WHERE IDProcess = $ProcessId"
 $usage = $Process.PercentProcessorTime
 
 
 # process Mem information

 $TotalMemory = (Get-CimInstance Win32_ComputerSystem).TotalPhysicalMemory / 1GB

 $ProcessMem = Get-CIMInstance Win32_Process -Filter "ProcessId = '$id'"
 $MemSizeInKB = $ProcessMem.WS/1KB
 $PeakWorkingSetInKB = $Process.PeakWorkingSet/1KB
 $PageCountInKB = $ProcessMem.PrivatePageCount/1KB
 $NonPagedPoolInKB = $ProcessMem.QuotaNonPagedPoolUsage/1KB
 $PagedPoolInKB = $ProcessMem.QuotaPagedPoolUsage/1KB
 
 $TotalMemory = "{0:n3}" -f $TotalMemory
 $MemSizeInKB = "{0:n3}" -f $MemSizeInKB
 $PeakWorkingSetInKB = "{0:n3}" -f $PeakWorkingSetInKB
 $PageCountInKB = "{0:n3}" -f $PageCountInKB
 $NonPagedPoolInKB = "{0:n3}" -f $NonPagedPoolInKB
 $PagedPoolInKB = "{0:n3}" -f $PagedPoolInKB
 
 #write-host "$TotalMemory"
 #write-host "$MemSizeInKB"
 #write-host "$PeakWorkingSetInKB"
 #write-host "$PageCountInKB"
 #write-host "$NonPagedPoolInKB"
 #write-host "$PagedPoolInKB"
 
 # commandline information
 $commandline = (Get-CimInstance Win32_Process -Filter "ProcessId=$id").CommandLine
 
 $FileName = $filedate+"_memory_usage.txt"
 $FullPath = Join-Path -Path "C:\Users\mvdbo\OneDrive\Documenten\PowerShell" -ChildPath $FileName

 $regel = "$date - pid: $id - cpu: $usage % - mem: $MemSizeInKB KB - pws: $PeakWorkingSetInKB KB - pc: $PageCountInKB KB - pp: $PagedPoolInKB KB - command: $commandline"
 $regel | Out-File -FilePath $FullPath -Encoding utf8 -Append
 
 }

 # Sources
 # https://learn.microsoft.com/en-us/windows/win32/psapi/process-memory-usage-information

macOS desktop extended across 3 screens: iMac, MacBook and iPad

Sun, 26 Nov 2023 15:16:27 +0000

In the setup I use I have the following 3 devices:

iMac 27" late 2015 with OpenCore Legacy Patcher Sonoma: 14.1.1
MacBook Pro 15" late 2016 with OpenCore Legacy Patcher Sonoma: 14.1.1
iPad 10.2" 7th Gen with iPadOS version: 17.1.1

They are connected to the same WiFi network.

Steps:

On the iMac go to: System Settings -> Displays
Click the plus sign to the right of the Built-in Display
Choose under Mirror or Extend to: MacBook Pro
Choose under Link keyboard and mouse to: iPad
You now see the 3 screens under Displays, but it is not yet extended across all 3
Click on the iPad
Choose for the option: “Use as” - select: Extend or mirrored display
You now see the same desktop on all 3 devices
And you can drag applications from the iMac to the MacBook or the iPad

Multiple versions of Java on macOS

Wed, 27 Sep 2023 17:43:18 +0000

$ ls -al /usr/local/opt/ | grep -i openjdk

$ brew install jenv

$ jenv add /Library/Java/JavaVirtualMachines/openjdk-17.jdk/Contents/Home/

$ jenv versions
$ jenv local 1.8
$ java -version
$ jenv global 1.8
$ java -version
$ jenv shell 1.8
$ java -version
$ jenv versions

The Linux mlocate command on macOS

Wed, 27 Sep 2023 17:40:13 +0000

The Linux mlocate command under macOS

sudo /usr/libexec/locate.updatedb

sudo ln -s /usr/libexec/locate.updatedb /usr/local/bin/updatedb

Sharing files with MS-DOS 6.22 in VirtualBox and macOS

Sun, 17 Sep 2023 12:29:24 +0000

How to create an ISO file of a directory on macOS that can be mounted as a CDROM in MS-DOS 6.22 ?

Start Disk Utility on macOS

Go to: File -> New Image -> Image from Folder
Choose the directory and press Choose
Set Image Format to: DVD/CD master and press Save
A *.cdr file will be created
Go to the command line
Cd to the directory with the *.cdr file
Type the command: $ hdiutil makehybrid -iso -joliet -o tcc.iso TCC.cdr
Go to your virtual machine running MS-DOS 6.22 and mount the newly created *.iso file
In the MS-DOS 6.22 virtual machine you can now access the contents on drive D:

Any questions?

Linux disk space information more clearly excluding the denied and cannot messages

Tue, 05 Sep 2023 06:23:38 +0000

$ du -hs * 2> >(egrep -iv ‘permission denied|cannot access’) | sort -n

Linux locate lost storage space difference between results df and du

Tue, 05 Sep 2023 06:18:17 +0000

$ lsof | grep -E ‘^COM|deleted’

How to burn an *.iso file to CD or DVD in Windows

Fri, 21 Jul 2023 17:04:59 +0000

In File Explorer right-click on the *.ISO file and choose Properties.
Then, click Change from the General tab, choose Windows Explorer, and click OK.
Next, save the change by clicking Apply > OK
Now right click on the *.ISO file and choose: Burn disc image or on: Show more options to find this.

Saving a website exactly as it looks

Wed, 05 Jul 2023 18:02:27 +0000

Saving a website exactly as it looks

(1) With the Microsoft Edge Browser:

step 1.: are you on the website you want to save? Or navigate to it.

step 2.: click on the 3 dots in the top right of the screen …

step 3.: click on: Web capture (with the camera icon)

step 4.: choose the option: Capture full page

step 5.: click the disk icon (Save) in the top right of the screen

Search the Internet anonymously, protect your privacy

Wed, 21 Jun 2023 17:10:45 +0000

Do you want to stay anonymous when searching the Internet?

Then use a different web browser. The Tor Browser was specifically developed to stay anonymous.

Step 1.: go to the website: https://www.torproject.org/

Step 2.: download the Tor Browser

Step 3.: install the new application

Please note! Do not change the size of the application window, as this can already reveal information about your identity. The advice: do not do this.

Microsoft makes Office available for free on the website

Wed, 21 Jun 2023 16:46:56 +0000

Do you already have a Microsoft account?

Step 1.: log in to the website: office.com

Step 2.: click on the icon with the 9 dots in the top left of the screen

Step 3.: choose the Office app you want to use

If you don’t have a Microsoft account yet you can create one for free.

Step 1.: go to the website: account.microsoft.com

Step 2.: click the sign in button

Creating a shortcut with an icon on the desktop

Wed, 10 May 2023 19:09:51 +0000

Part 1: creating the shortcut

Go to the website you find useful and want quick access to
For example: nu.nl , open in your browser: https:/www.nu.nl
Click (with the left mouse button) on the address bar where the website address is shown, it will turn blue.
If it does not automatically turn blue, you need to select the address and highlight it yourself
Right-click on the blue text and choose: Copy
Click the minus sign to minimise the web browser so you can see the desktop
Right-click on the desktop and choose: New -> Shortcut
Right-click in the location rectangle and choose: Paste
Click Next
Give the shortcut the name of the website and click: Finish

You now have your shortcut

Part 2: changing the icon to the website’s logo

Have you heard of: ChatGPT? Find answers to all your difficult questions!

Sun, 30 Apr 2023 13:15:53 +0000

Are you looking for answers to your difficult questions? Questions you just can’t seem to find the answer to? Not even on Google?

Get truly direct answers to your questions with ChatGPT.

See: https://chat.openai.com

You can ask questions such as:

Why do we live here on earth?

Why did England leave the European Union in Brexit?

What is the best thing to do to protect someone and prevent unbearable pain?

What is the best thing to do to help your partner if she has had a shocking experience?

Bring an old / second-hand Apple Mac computer back to life with OpenCore Legacy Patcher

Sun, 30 Apr 2023 12:53:36 +0000

Is computing your hobby and have you always wanted to try an Apple Mac? A tip / recommendation is OpenCore Legacy Patcher.

See the official website: https://github.com/dortania/OpenCore-Legacy-Patcher/releases

And the YouTube channel: https://www.youtube.com/@Mr.Macintosh

With this tool you can still use older / second-hand and now cheaper hardware with the latest software. Truly worth trying at least once.

Create a Windows - God Mode - shortcut

Sun, 05 Mar 2023 13:40:14 +0000

Right-click on the Desktop
Choose: New -> Folder
Name the folder: GodMode.{ED7BA470-8E54-465E-825C-99712043E01C}
Open the folder for a huge number of advanced settings
The shortcuts in this folder can be copied to, for example, the Desktop for even faster access

Automatically log in to a Linux server using PuTTY on Windows

Fri, 17 Feb 2023 14:51:15 +0000

You can automatically log in to a Linux server on Windows using PuTTY by making use of a key file. Below I explain step by step how to do this.

Create a key: start: puttygen.exe
Click on: Generate
Click on: Save private key
Go to PuTTY Configuration -> Session
Load a previously created session or create a new one
Go to: Connection -> SSH -> Auth -> Private key file for authentication -> Browse
Select your file with the private key: *.ppk
Go back to Session and click on: Save
Log in to the Linux server using the Saved Sessions and still with your password
Create a new directory in the home directory: .ssh
Give this directory the correct permissions: chmod 700 ~/.ssh
Create and edit the file authorized_keys: vi ~/ssh/authorized_keys
Copy the Public key for pasting from the PuTTY Key Generator
Paste it into the authorized_keys file on the Linux server
Save the authorized_keys file (for vi type: :wq)
Give this file the correct permissions: chmod 600 ~/.ssh/authorized_keys
Close the logged-in PuTTY session to the Linux Server
Open the session again to verify that you can now log in automatically

Change your Windows password using a shortcut

Thu, 16 Feb 2023 10:56:24 +0000

Change your Windows password by using a shortcut on your desktop. (CTRL+ALT+DEL key combination by clicking a shortcut)

Right-click on your desktop, choose New and then Shortcut
Enter the following command for the item location:
C:\Windows\explorer.exe shell:::{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}
Click: Next
Give the shortcut a name, for example: Reset password
Click: Finish

Installing Virtual Machines on macOS Monterey OpenCore Legacy Patcher

Thu, 01 Dec 2022 21:20:43 +0000

Try Oracle VirtualBox version 6.1.40 the older version. In my home lab the newest version of VirtualBox 7.0.4 did not work due to the error: hv_vm_create() failed: 0xfae94001 (VERR_NEM_INIT_FAILED)

In the older version this was not an issue.

Prevent opening Windows 11 Store when typing the command python

Thu, 01 Dec 2022 19:30:38 +0000

Step 1: Open Settings in Windows 11

Step 2: Go to Apps

Step 3: Go to Advanced app settings

Step 4: Go to App execution aliases

Step 5: Disable the option for python.exe and python3.exe

Python dependencies when installing Oracle VirtualBox on Windows 11

Thu, 01 Dec 2022 19:24:55 +0000

Step 1: install Python

Step 2: add both the scripts folder and its parent folder to the path

Step 3: CMD> pip install pywin32

Any iMac as a second display with extended desktop

Mon, 31 Oct 2022 17:55:56 +0000

Install Windows on your iMac and use the software utility spacedesk.

Such a simple solution to turn any iMac into a second (or even a third or more) display to extended your desktop.

Concourse starting automatically at boot with systemctl service

Thu, 16 Jun 2022 18:55:47 +0000

/home/martijn/Downloads/concourse
$ curl -LO https://concourse-ci.org/docker-compose.yml

$ cat /etc/systemd/system/docker-compose-concourse.service

[Unit]
Description=Docker Compose Application Service for Concourse
Requires=docker.service
After=docker.service

[Service]
Type=oneshot
RemainAfterExit=yes
WorkingDirectory=/home/martijn/Downloads/concourse
ExecStart=/usr/bin/docker-compose up -d
ExecStop=/usr/bin/docker-compose down
TimeoutStartSec=0

[Install]
WantedBy=multi-user.target

Concourse persistent PostgreSQL database in Docker

Thu, 16 Jun 2022 18:50:41 +0000

$ sudo docker-compose stop concourse-db

$ sudo docker ps
$ sudo docker cp -a <docker postgresql database id>:/database .\

$ vim docker-compose.yml
	image: postgres
	volumes: \["./database:/database"]
	environment:

$ sudo docker-compose up -d --no-deps concourse-db

Clearing cookies when closing your web browser

Thu, 02 Jun 2022 09:41:34 +0000

Google Chrome: https://youtu.be/FAKQyjzLXrA

Microsoft Edge: https://youtu.be/nj3eNmNeip4

Safari on iPad: https://youtu.be/dymKWea_600

Set the Python interpreter version for the extension: Code Runner in VSCodium

Sun, 03 Apr 2022 19:55:44 +0000

# File name: version_used.py

# This prints the version of Python being used by the Code Runner extension in VSCodium
# Set by going to: File -> Preferences -> Settings -> Search Settings -> code-runner.executorMap -> Edit in settings.json
# "python": "/bin/python3.9 -u",

# To run this script press the little play button on the top right in the editor

import sys
print(sys.version)

Install Python 3.9 on Ubuntu Linux

Sun, 03 Apr 2022 18:55:18 +0000

$ sudo apt install software-properties-common

$ sudo add-apt-repository ppa:deadsnakes/ppa

$ sudo apt update

$ sudo apt install python3.9

$ python3.9 –version

Install the editor VSCodium on Ubuntu Linux

Sun, 03 Apr 2022 14:22:24 +0000

$ wget -qO - https://gitlab.com/paulcarroty/vscodium-deb-rpm-repo/raw/master/pub.gpg | sudo apt-key add -

$ sudo echo ‘deb https://vscodium.c7.ee/debs/ vscodium main’ | sudo tee –append /etc/apt/sources.list.d/vscodium.list

$ sudo apt update

$ sudo apt install codium

Install the Google Chrome Web Browser on Ubuntu Linux

Sun, 03 Apr 2022 11:51:54 +0000

$ wget -q -O - https://dl.google.com/linux/linux_signing_key.pub | sudo apt-key add -

$ sudo sh -c ’echo “deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main” » /etc/apt/sources.list.d/google-chrome.list'

$ sudo apt update

$ sudo apt install google-chrome-stable

New content for your website via a web page

Fri, 25 Feb 2022 11:44:45 +0000

Add Netlify CMS to your website to add new content via a web page instead of the command line.

New life in an old Apple computer (iMac, MacBook)

Fri, 25 Feb 2022 11:09:02 +0000

Install the VirtualBox application and run a virtual machine inside it with the latest version of Linux or Windows. In many cases this can solve problems with browsing the internet — for example, making it possible to visit websites that no longer work in the old Apple environment.