centos

Lets Encrypt on CentOS 8

Install Let’s Encrypt on Centos 8

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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

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CentOS Linux

CentOS vs Fedora

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CentOS and Fedora are two of the most well known and widespread Linux distributions. They’re both based on Red Hat Enterprise Linux (RHEL), which means Fedora and CentOS bear a lot of similarities to their ancestor, but also to each other.

In this guide, we’ll be comparing the two distributions across a few key areas and giving a brief review of both distros. Read on to learn more about CentOS and Fedora and how they compare. By the end of this article, you’ll be armed with enough information to choose the best distro for your needs.

In this tutorial you will learn:

  • CentOS and Fedora background information
  • CentOS and Fedora similarities and differences
  • Which distro should I use, CentOS or Fedora?

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Red Hat Enterprise Linux

Oracle Linux vs Red Hat (RHEL)

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Oracle Linux and Red Hat Enterprise Linux (RHEL) are well-known Linux distributions, often used in the business world. Each distro has their own pros and cons, differences, and similarities to the other.

In this guide, we’ll be comparing the two distributions across a few key areas and giving a brief review of both distros. Read on to learn more about Oracle Linux and RHEL and how they compare. By the end of this article, you’ll be armed with enough information to choose the best distro for your needs.

In this tutorial you will learn:

  • Oracle Linux and RHEL background information
  • Oracle Linux and RHEL similarities and differences
  • Which distro should I use, Oracle Linux or RHEL?

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Apache Solr installed on Linux

Apache Solr Linux install

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Apache Solr is open source search software. It’s capable of being implemented as an enterprise-level search engine thanks to its high scalability, advanced indexing, fast queries, and ability to integrate with a large variety of applications. It’s capable of tackling big data and also has high availability with its load balancing and failover configurations.

The platform is written in Java and can be installed on Linux systems. In this guide, we’ll show the step by step instructions for installing Apache Solr on some of the most popular Linux distros, including Ubuntu, Debian, CentOS, and Red Hat.

In this tutorial you will learn:

  • How to install Apache Solr on Debian based systems
  • How to install Apache Solr on Red Hat based systems
  • Initial configuration of Apache Solr
Apache Solr installed on Linux

Apache Solr installed on Linux

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firewalld on CentOS

Install firewalld on CentOS Linux system

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firewalld is a front-end for the built in netfilter firewall on Linux systems. The main advantage of firewalld over using raw nftables/iptables commands is that it’s easier to use, especially for more complex firewall features like timed rules. In this regard, it’s similar to the uncomplicated firewall (ufw) that comes installed by default on Ubuntu systems.

On CentOS, firewalld is the default firewall interface and should already be installed on your system. In this guide, we’ll take you through the installation of firewalld on CentOS, which includes some basic usage commands so you can get started managing the firewall.

In this tutorial you will learn:

  • How to install and update firewalld
  • firewalld basic usage commands

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How to update CentOS

How to update CentOS

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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

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How to install Fedora/RHEL/CentOS via kickstart on an existing LUKS device

How to install Fedora/RHEL/CentOS via kickstart on an existing LUKS device

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Kickstart installations let us easily script and replicate unattended or semi-unattended installations of Fedora, Red Hat Enterprise Linux or CentOS. The instructions needed to install the operating system are specified, with a dedicated syntax, inside a Kickstart file which is passed to the Anaconda installer. In this tutorial we will see how to reuse an already existing LUKS (Linux Unified Keys Setup) container when performing a Kickstart installation: this is something that cannot be achieved just with Kickstart instructions and requires some extra steps.

In this tutorial you will learn:

  • How to use an existing LUKS container when performing a Kickstart installation of Fedora, RHEL or CentOS
  • How to create and use an updates.img file to be used with the Anaconda installer.

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Installed Nvidia drivers on CentOS 7 Linux GNOME desktop

How to install the NVIDIA drivers on CentOS 7 Linux

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The CentOS 7’s support for Nvidia video graphic cards comes in a form of an open source nouveau driver. In case the nouveau driver is not a sufficient solution, users can install the official Nvidia driver as a proprietary alternative. This step by steps tutorial will guide you through the entire process on Nvidia driver installation.

To install Nvidia driver on other Linux distributions, follow our Nvidia Linux Driver guide.

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generate rndc and bind configuration - centos

Configure RNDC Key for Bind DNS server on CentOS 7

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Objective

In order to administer DNS server (bind) from a command line, the RNDC utility needs to be correctly configured to avoid error message such as “rndc connect failed 127.0.0.1 connection refused“. The objective is to configure RNDC for Bind DNS server on CentOS 7 Linux.

Operating System and Software Versions

  • Operating System: – CentOS Linux release 7.4.1708 (Core) Linux
  • Software: – Bind 9

Requirements

Privileged access to your Ubuntu System as root or via sudo command is required.

Difficulty

EASY

Conventions

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