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  1. Jarret B

    Sandboxing with Firejail

    Security on a Linux system is very important for any Administrator or regular user. Security on home systems can be as important as a business server. Home systems can contain personal information that can be used for identity theft, credit card fraud, etc. Business servers can contain...
  2. Jarret B

    Linux on Embedded Ryzen with Radeon

    Advanced Micro Devices (AMD) has released the Ryzen processors which works very well with Linux. The embedded processor also contains a Graphical Processing Unit (GPU) which is an AMD Ryzen Vega. The board I am using is the IBase IB918 to install Linux. Linux can be installed from a stock...
  3. Jarret B

    RockPro64 Review

    The RockPro64 is a Single Board Computer (SBC) made by the Pine64 organization found at www.Pine64.org. The organization makes Linux phones, SBCs, Laptops, watch developer kits and other items. PinePro64 The SBC has the following specifications: Processor: Rockchip RK3399 SOC...
  4. Jarret B

    Securing Ubuntu with AppArmor

    Many businesses and organizations need ways to limit access to specific applications. Application Armor (AppArmor) can prevent apps from accessing specific folders or even the Internet. AppArmor provides Mandatory Access Control (MAC). The MAC is a profile which is set up per program to...
  5. Jarret B

    BeagleBone Blue and Black

    Previously I wrote an article on the BeagleBone PocketBeagle which was a very small single-board computer. In this article I will go over the specs on two slightly larger boards. BeagleBone Blue The main specs for BeagleBone Blue are: AM335x 1GHz ARM® Cortex-A8 processor 512MB...
  6. Jarret B

    Installing Linux on an iMac

    Many people may like the look and feel of Linux over other Desktop Operating Systems (OS). For this reason someone may want to install Linux on a Mac. There are many types of Apple Mac systems available. For this article I used an iMac 6.1 from late 2006. The specs on the iMac are as...
  7. Jarret B

    PocketBeagle Single Board Review

    The PocketBeagle is a single board PC which is different from other single board systems. Most other single board systems are based off the ARM Application (A series) chips. The Pocket Beagle has a Cortex-A8 CPU as well as an M series or Micro-controller. The Micro-controller is a Cortex-M3...
  8. Jarret B

    LFCS – GRUB Installation and Security

    After the previous article on resetting the Root password (https://linux.org/threads/lfcs-–-how-to-recover-root-password.25257/) you may wonder at the security of Linux. If you can use the GRand Unified Bootloader (GRUB) to bypass Root privileges then there seems to be no security. In this...
  9. Jarret B

    Ubuntu 18.04 64-bit for Raspberry Pi 4

    Anyone who may have a new Raspberry Pi 4 (RPi4) will love its improvements over the Raspberry Pi 3 (RPi3). The only issue is at the time of this writing there wasn’t a 64-bit Operating System (OS) for it. In the next few months many distros will probably release a 64-bit version for it...
  10. Jarret B

    LFCS – How to Recover ROOT Password

    There are many reasons why a Root password may be lost or forgotten. In business settings it may be as simple as the administrator no longer works for the company. The LFCS exam deals with the CentOS 7 Operating System but I will also cover changing the Root password on an 18.04 Ubuntu...
  11. Jarret B

    Raspberry Pi 4 Review and Benchmarks

    For those who haven’t heard, the newest version of the Raspberry Pi (RPi) has been released. Technically it is the Raspberry Pi 4 Model B (RPi4). The Raspberry Pi 4 is a 64-bit single board system. The single board measures 3.5 x 2.3 x .76 inches in size. The board contains the following...
  12. Jarret B

    GRUB Themes

    When I wrote my last article on Grub Configuration I found a lot of people wanting to use GRUB Themes. Many people said it was too complicated so I will try to cover a basic theme to get you started. Looking at Figure 1 you can see a basic one that I made which we will go over how to make...
  13. Jarret B

    GRUB Configuration

    The GRand Unified Bootloader (GRUB) is used by systems to take control after the system BIOS is completed. GRUB may then show a menu to allow a user to choose from multiple Operating Systems (OS) or kernels of a specific OS. With GRUB there are many configurable settings you can make on a...
  14. Jarret B

    Using Docker Volumes

    When using Docker it is sometimes necessary to update files quite often. Updating those files can be a big hassle since the whole container must be recreated each time. For instance, if you set up a website in Docker you would have to rebuild the container every time you wanted to change any...
  15. Jarret B

    Multi-boot Full Install to a USB

    Sometimes you may need a ‘Fix Stick’ to repair to test a system. But what if there is a mix of Distros you deal with? For instance, some systems are Ubuntu based and others are Red Hat. You may want to have specific programs for each type. What if Windows is thrown into the mix? Maybe you...
  16. Jarret B

    ISO File Manipulation

    The ISO file is a standard (ISO-9660) to store data on optical media. In some cases the image is an exact duplicate of a disk. The data being saved can not only include the files themselves, but the folder structure, attributes of the files and boot information. ISO files usually contain a...
  17. Jarret B

    LFCS Training – Secure Shell (SSH)

    Secure Shell (SSH) allows for encrypted connections between two systems. The encryption method can be changed to your preference as we will cover in this article. Also we will go over the ways to authenticate, copy files between systems and log onto multiple systems at once. Client Names...
  18. Jarret B

    Docker Container Advanced Creation

    We previously looked at making a basic Docker container which allowed interaction from a user. The container could be used on another system by being moved to another Linux Operating System or even a Windows or MacOS system running Docker. In this article we will be going over making a more...
  19. Jarret B

    USB Port Management

    With the abundance of Universal Serial Bus (USB) devices it is difficult to come across a system which is not using some type of USB device. Systems have numerous USB ports and there can arise some complications when connecting too many devices. To help with such difficulties it is best to...
  20. Jarret B

    Creating a Docker Container

    To create a Docker Container which executes or contains a specific program you must first create the Docker image. You can kind of associate an image with an ISO file. The container is when the image is running, such as loading an ISO file in Virtualbox and installing it. Let’s look at...
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