Recently on YouTube I was asked to put together some of the best resources for learning CentOS.

I’ve gathered my top 5 resources below:

1. How To Forge https://www.howtoforge.com/tutorials/centos/
   • Some really good tutorials on this site and easy to follow
2. Digital Ocean https://www.digitalocean.com/community/tags/centos?primary_filter=newest
   • I use Digital Ocean to host servers and theior CentOs tutorials are great some are a little old but still of a very high quality
3. Shameless self plug Darren’s Tech Tutorials https://www.youtube.com/darrenstechtutorials
   • Tonnes of CentOs Videos aswell as plenty on windows and AWS
4. The CentOs wiki https://wiki.centos.org/
   • Has tonnes of Great information on Centos
5. Last but not least the official CentOS man pages are a wealth of good information.

The Video below shows me discussing these options

This video will show you how to install MariaDB Server on CentOS 8.

MariaDB is a free and opensource database engine.

The commands that you need to follow this tutorial are:

• sudo yum install mariadb
• sudo yum install mariadb-server
• sudo systemctl status mariadb
• sudo systemctl start mariadb

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

This Video will show you how to resolve the error: UnCaught Error Call to undefined json_decode

I got this issue while installing moodle on CentOS 8.

To bypass this error I ran;

sudo yum install php_json

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!

This short video will show you how to install PHP on CentOS 8.

The command you need to run is:

Sudo yum install php.

This command will also work on older versions of Centos is including Centos & and it will also work on Redhat Linux RHEL

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

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.

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.