Posts

Installing Docker on Ubuntu 24

To start using Docker Engine on Ubuntu, make sure you meet the prerequisites and follow the installation steps. Prerequisites Operating System Requirements To install Docker Engine, you need the 64-bit version of one of these Ubuntu releases: Ubuntu Oracular 24.10 Ubuntu Noble 24.04 (LTS) Ubuntu Jammy 22.04 (LTS) Ubuntu Focal 20.04 (LTS) Docker Engine for Ubuntu is compatible with x86_64 (or amd64), armhf, arm64, s390x, and ppc64le (ppc64el) architectures. Note: Installation on Ubuntu-derived distributions, such as Linux Mint, is not officially supported (although it may work).

Sunday, March 9, 2025 | 7 minutes Read

Installation GNS3 in Debian 12

In this article, I present an update of the process of installing GNS3 in Debian 12, based on the previous post for Debian 11. If you need more detailed details about the installation or configuration of GNS3, I recommend you review the previous version. GNS3 installation We update the repositories and install the available system updates. javiercruces@HPOMEN15:~$ sudo apt update -y && sudo apt upgrade -y We install the necessary dependencies for GNS3, including Python, virtualization tools (KVM, QEMU, libvirt), additional libraries (PyQt5, dynamipes) and other utilities.

Sunday, September 8, 2024 | 3 minutes Read

How to Choose Which GPU to Use on My Laptop with Linux

If you have a Linux laptop with an NVIDIA GPU, you may have noticed that the video ports are not working properly after installing the graphics drivers. If this sounds familiar, don’t worry I’ve got you covered. I’ve been investigating and found a tool that can save you several headaches. It’s called EnvyControl, a command-line utility (CLI) that allows you to easily choose which graphics card you want to use on your computer. This is especially useful if your laptop has a hybrid graphics configuration, such as Intel + NVIDIA or AMD + NVIDIA.

Sunday, September 1, 2024 | 3 minutes Read

Installation and Configuration of MariaDB in Debian 12

MariaDB installation and configuration in Debian 12 To install MariaDB in Debian 12, follow these steps: 1.Update the repositories and install the MariaDB package: First, update your system repositories and install MariaDB: javiercruces@jcruces:~$ sudo apt update javiercruces@jcruces:~$ sudo apt install mariadb-server 2.Enable and start the MariaDB service: Once installed, set MariaDB to automatically start the start and then start the service: javiercruces@jcruces:~$ sudo systemctl start mariadb javiercruces@jcruces:~$ sudo systemctl enable mariadb 3.Configure MariaDB:

Sunday, September 1, 2024 | 2 minutes Read

Installation of NVIDIA Controllers in Debian 12

The installation of NVIDIA drivers in the Linux universe has traditionally been a challenge, especially in distributions such as Debian, where free software policies often complicate the process. In this post I will explain a simple way to install NVIDIA drivers using the official Debian repositories. In addition, at the end of the article, you will learn to install a key tool called Nvidia Optimus, which will provide you with the ability to select which graphics card you will use.

Sunday, September 1, 2024 | 5 minutes Read

Interconnection of database servers

This post addresses how to configure and manage connections between different databases, both homogeneous and heterogeneous, to facilitate interoperability between various database systems. Throughout the article, different connection scenarios are explored, starting with configurations between databases of the same type, such as Oracle to Oracle or PostgreSQL to PostgreSQL, and then moving towards heterogeneous connections between different technologies, such as Oracle to MySQL, PostgreSQL to Oracle, and vice versa. It also covers the steps needed to configure links, create users, and modify key configuration files, allowing remote consultations.

Sunday, September 1, 2024 | 9 minutes Read

Oracle installation 19c under Debian 12

Installing Oracle 19c on Debian 12 may seem complicated, but don’t worry, I’m here to guide you in every step. In this post, I will explain to you in a simple way how to prepare your system and make the installation of Oracle 19c in Debian 12. Update the repositories The first thing is to update the repositories of our virtual machine and in case we don’t have any packages we update it:

Sunday, September 1, 2024 | 4 minutes Read

PostgreSQL installation in Debian 12

In this post, I will guide you through the process of installing PostgreSQL in Debian 12, creating a user with basic permissions, and how to create and consult a database. #1. PostgreSQL installation To install PostgreSQL in Debian 12, follow these steps: Update the repositories and install PostgreSQL * *: First, make sure your system is updated and install PostgreSQL: ```bash sudo apt update sudo apt install postgresql ``` Verifies that the service is in operation * *: After installation, make sure that the PostgreSQL service is in operation:

Sunday, September 1, 2024 | 3 minutes Read

Remote access configuration in MariaDB

To allow remote access to your MariaDB server, follow these steps: Configure the MariaDB configuration file First, edit the MariaDB configuration file to allow connections from specific IP addresses. Open the file /etc/mysql/mariadb.conf.d/50-server.cnf with a text editor, for example, nano: sudo nano /etc/mysql/mariadb.conf.d/50-server.cnf Find the line that starts with bind-address and change it to accept connections from any IP address. You can have him accept connections from all the PIs with:

Sunday, September 1, 2024 | 2 minutes Read

Remote Access Configuration in Oracle

To configure remote access in Oracle, it is essential to correctly adjust the network files located in $ORACLE_HOME/network/admin. These files, such as listener.ora and tnsnames.ora, allow us to define how clients will connect to the database and which equipment will have access. Remote Access Configuration The Oracle configuration with respect to the network is saved in the directory that we have defined as the Oracle home: $ORACLE_HOME/network/admin.

Sunday, September 1, 2024 | 2 minutes Read

Comparative between OpenVPN and Wireguard

The goal of this post is to compare the different VPNs software most used by seeing which is faster, for which we will support in speed test using iperf3. [NOTE] The comparative part of the posts in this section in which we mount each type of VPN. Speed without VPN I’m gonna start by comparing the speeds of these 2 systems, using iperf3. For this I have removed the cisco router as I had it configured with FastEthernet interfaces and changed it to a Linux router with GigabitEthernet interfaces.

Thursday, March 28, 2024 | 9 minutes Read

Create certification authority (CA) and self-signed certificates in Linux

At first a student will establish a Certified Authority and sign a certificate for the other student’s page. We will then test it on the Apache and Nginx web servers. Create the certifying authority Step 1: Creating directories and files The first step will be to generate a directory in which you will locate your certification authority, in order to maintain an organization at all times. The directory name will be CA /. In turn, you have to generate several subdirectories within it:

Thursday, March 28, 2024 | 15 minutes Read