Category Archives: Uncategorized

How to install Virtual box Guest additions on CentOs 8, ake CentOS 8 full screen in Virtual box

This virtualbox tutorial will show you how to install Virtual box Guest additions on CentOs 8.

When this process is done you will be able to make CentOS 8 full screen in Virtual box, so in affect the video shows how to make Centos 8 full screen in Virtual box.

The command that i run to download the relevant packages are:

sudo yum install tar bzip2 kernel-headers perl gcc make elfutils-libelf-devel

How to use snapshots on Virtualbox

This Virtualbox tutorial will show you how to take a snapshot on Virtualbox. First you will see how to take a snapshot of a running virtual machine. You will then see how to restore the snapshot. Snapshots allow you to save the state of a virtual machine; this can be useful when you want to test something, or you’re about to make a change to that virtual machine, and you need to be able to roll back to a working instance. Snapshots have saved me on numerous occasions and are an excellent feature!

Unable to open primary script

This Video will show you how to solve the error: unable to open primary script permission denied on Centos 8.

In this video i was trying to install moodle and when i went to access the site, I kept getting an error. In the Apache logs i could see the error: unable to open primary script: ‘Unable to open primary script varwwwhtmlmoodleindex.php (Permission denied)

When i delved into the error i could see that it was selinux was causing the issue.

You can disable selinux on the fly by entering: sudo setenforce 0

but to permanently disable you should edit the/etc/selinux/config file and

set selinux to disabled SELINUX=disabled

 

Java keystore tutorial: How to export a Certificate from a Java Keystore

This Java Keytool Tutorial will show you how to export a Certificate from a Java Keystore.

To begin you will first run (Note ensure that you update the relvnet commands to reflect your Keystore, alias and certificate names) :

keytool -list -keystore keystore.jks

to see what certificates reside in the java keystore.

Next you will run:

keytool -exportcert -alias domain -file domain.der -keystore keystore.jks

to export the Certificate.

Sound not working on Mac

This Mac tutorial will show you how to correct sound not working on Mac. It will show you what to check when you have no sound on Mac.

It will show you where to access the Mac Audio settings and the changes need to select your audio outputs.

As part of sound troubleshooting we will access systems preferences the audio and then change our audio output to internal.

How To Install Python 3.8 on Windows 10

Python is an interpreted, high-level, general-purpose programming language. Created by Guido van Rossum and first released in 1991, Python’s design philosophy emphasizes code readability with its notable use of significant whitespace. Its language constructs and object-oriented approach aim to help programmers write clear, logical code for small and large-scale projects.

This Python 3 tutorial will show you how to download and install python 3 on windows. This python tutorial will show you how to download and install python 3.8.2. You will first see how to download python 3.8.2 next you will see how to install python 3.8.2 on Windows 10.

How To Enable Root On Mac

A full blog post with all the steps listed out can be found here. Macs are built on Unix and as such, you can use the terminal to run commands. However, by default root is disabled. This video will show you how to enable root on mac so you can run commands as sudo.

  • Click the apple symbol the upper left of your screen.
  • Click System Preferences
  • In the screen that appears click Users and Groups.
  • Click login options and then click the lock to allow you to make changes.
  • In the screen that appears enter your username and password.
  • Click Join next to Network account Server.
  • Then click Open Directory Utility.
  • In the screen that appears click the lock to allow you to make changes.
  • Enter your username and password.
  • Now at the top of the screen click edit & then Enable Root User.
  • Enter your root password and then click ok.
  • You can now run commands as root from the Mac Terminal

A full video can be found here: