Disabling SELinux on CentOS 8

How to disable SELinux on CentOS 8

SELinux, which stands for Security Enhanced Linux, is an extra layer of security control built into Red Hat Enterprise Linux and its derivative Linux distributions, such as CentOS. SELinux is enabled by default on CentOS 8, and would have to be manually disabled if a user doesn’t wish to use it.

Although SELinux can protect our system through access control for programs and system services, it’s not always necessary to have it enabled. Some users may even find that it interferes with certain programs they try to install. In this guide, we’ll go over the step by step instructions to disable SELinux on CentOS 8, both temporarily or persistently across reboots.

In this tutorial you will learn:

  • How to check the status of SELinux
  • How to put SELinux in permissive mode
  • How to disable SELinux

Read more

Lets Encrypt on CentOS 8

Install Let’s Encrypt on Centos 8

SSL encryption for your website is extremely important. It prevents man in the middle attacks, helps your page’s SEO, and browsers like Firefox won’t warn users that your site is insecure.

Best of all, you can get all these advantages for just a few minutes of your time. In this guide, we’ll show you how to install Let’s Encrypt on Centos 8, and how to use it to configure SSL encryption for your website. In a few steps, your site will become accessible via HTTPS, with HTTP links (optionally) redirecting to the secure protocol as well.

In this tutorial you will learn:

  • How to install Let’s Encrypt
  • How to configure Let’s Encrypt SSL

Read more

How to update CentOS

How to update CentOS

Like all Linux distros, it’s important to keep your CentOS system up to date in order to make sure that you have the latest security updates and newest features. Updating the system usually involves simply upgrading all installed packages to their latest versions. Every few years, there’s a new version of CentOS released, which requires a more involved update process to install.

In this article, we’ll cover updating a CentOS system on a per package basis and upgrading the entire operating system. This can be done via command line and GUI. Both methods will be shown in this guide, so you can pick whichever is easier for you.

The process for upgrading a CentOS system is a little different depending on which version you have installed. The latest version of Centos has moved to the dnf package manager. Previous to Centos 8, yum was the package manager used. Regardless of which version you’re running, we’ll show you the proper commands so you can update your system.

In this tutorial you will learn:

  • How to update CentOS packages via command line
  • How to update CentOS packages via GUI
  • How to upgrade entire CentOS system

Read more

docker-RHEL 8 / CentOS 8

How to install Docker CE on RHEL 8 / CentOS 8

The latest release of the RHEL 8 / CentOS 8. Red Hat has built its own tools, buildah and podman, which aim to be compatible with existing docker images and work without relying on a daemon, allowing the creation of containers as normal users, without the need of special permissions (with some limitations: e.g. at the moment of writing, it’s still not possible to map host ports to the container without privileges).

Some specific tools, however, are still missing: an equivalent of docker-compose, for example does not exists yet. In this tutorial we will see how to install and run the original Docker CE on Rhel8 by using the official Docker repository for CentOS7.

In this tutorial you will learn:

  • How to enable the docker-ce repository on RHEL 8 / CentOS 8
  • How to install docker and docker-compose on RHEL 8 / CentOS 8

docker-RHEL 8 / CentOS 8
Docker installed on RHEL 8 / CentOS 8

Read more

Basic mod_ssl module configuration on RHEL 8 / CentOS 8 with Apache webserver

How to install mod_ssl on RHEL 8 / CentOS 8 with httpd Apache webserver

The mod_ssl module provides SSL v3 and TLS v1.x support for the Apache HTTP Server. This article provides you with a basic step by step mod_ssl configuration on RHEL 8 / CentOS 8 Linux server with httpd Apache webserver.

In this tutorial you will learn:

  • How to install mod_ssl
  • How to enable mod_ssl
  • How to create a self-signed certificate
  • How to include existing SSL certificate into httpd configuration
  • How to redirect all non-ssl HTTP traffic to HTTPS

Read more

About RHEL 8

How To Install RHEL 8 Step by Step with Screenshots

RHEL 8 is the latest release of the popular enterprise distribution. Whether you’re installing RHEL for the first time, or you’re installing the latest version, the process is going to be fairly new to you. This guide walks you through the steps in the latest Red Hat Anaconda installer.

In this tutorial you will learn:

  • How to Set Your Language
  • How to Set Your Localization
  • How to Select Your Software
  • How to Configure Your Storage
  • How to Configure Your Network
  • How to Set Your Security Policy

Read more

Spark shell with pyspark.

How to install spark on RHEL 8

Apache Spark is a distributed computing system. It consists of a master and one or more slaves, where the master distributes the work among the slaves, thus giving the ability to use our many computers to work on one task. One could guess that this is indeed a powerful tool where tasks need large computations to complete, but can be split into smaller chunks of steps that can be pushed to the slaves to work on. Once our cluster is up and running, we can write programs to run on it in Python, Java, and Scala.

In this tutorial we will work on a single machine running Red Hat Enterprise Linux 8, and will install the Spark master and slave to the same machine, but keep in mind that the steps describing the slave setup can be applied to any number of computers, thus creating a real cluster that can process heavy workloads. We’ll also add the necessary unit files for management, and run a simple example against the cluster shipped with the distributed package to ensure our system is operational.

In this tutorial you will learn:

  • How to install Spark master and slave
  • How to add systemd unit files
  • How to verify successful master-slave connection
  • How to run a simple example job on the cluster

Read more

OTRS dashboard first login on RHEL 8 Linux

OTRS installation on RHEL 8

OTRS is an open source service management solution used by many companies around the world. It’s extensibility and ability to integrate with other systems no doubt add to it’s popularity. Written in perl, this software will run on mostly anything, and it’s low requirement on resources makes it ideal even for a small business to start ticketing, or standardize their internal processes.

In this tutorial we will install OTRS on a Red Hat Enterprise Linux 8. Keep in mind that the steps described below are only apply to version 6.0.14, Community Edition. For example, version 6.0.15 will not work when the below steps are performed on the same environment.

In this tutorial you will learn:

  • How to install OTRS from tarball
  • How to solve dependencies
  • How to configure the environment
  • How to run the web installer
  • How to login to the service

Read more

Apache ActiveMQ Welcome page on RHEL 8

How to install ActiveMQ on RHEL 8

Apache ActiveMQ is a widely used messaging server written in Java. As messaging services commonly do, it creates a bridge between heterogeneous systems for reliable data exchange in the form of messages pushed into queues by producer clients, where they wait to be “read”, or consumed by consumer clients.

Naturally a system that is client to ActiveMQ can be both producer and consumer, and more than one systems can subscribe to a queue or topic, thus enabling flexible communication between these client systems. Many different platforms and protocols can be used to connect to ActiveMQ, increasing it’s usefulness even more.

In this tutorial we will install Apache ActiveMQ on Red Hat Enterprise Linux 8 from tarball, add the systemd unit files for ease of use, and access the admin page of our new service to create a queue.

In this tutorial you will learn:

  • How to install ActiveMQ from tarball
  • How to set up environment from the command line
  • How to add systemd unit files for ActiveMQ
  • How to access the admin page

Read more

Installed WordPress on Red Hat Enterprise Linux 8 Server/Workstation.

How to install WordPress on RHEL 8 / CentOS 8 Linux

This article covers an installation of WordPress, free and open-source content management system, on RHEL 8 Linux Server. In this instance the installation is based on the well-know LAMP stack comprising the RHEL 8, MariaDB, PHP and Apache webserver.

In this tutorial you will learn:

  • How to Install LAMP Stack on RHEL 8 / CentOS 8.
  • How to configure MariaDB database.
  • How to install WordPress on RHEL 8 / CentOS 8.
  • How to open HTTP and HTTPS firewall ports.

Read more