Xinetd, or the Extended Internet Services Daemon, is a so-called super-server. You can configure it to listen in the place of many services, and start the service that should handle an incoming request only when there it actually arrives to the system - thus saving resources. While this may not seem to be a big deal on a system where traffic is relatively permanent, this service in the front of another approach does have some neat advantages, like logging or access control.

In this article we will install xinetd on a RHEL 8 / CentOS 8, and we'll put the sshd daemon under it's care. After verifying the setup, we'll tweak the configuration a bit to see the access control in action.

In this tutorial you will learn:
  • How to install xinetd
  • How to setup sshd on RHEL 8 / CentOS 8 as an xinetd service
  • How to allow access only from a specific network to the sshd service from xinetd
  • How to audit traffic from xinetd log entries

PhpMyAdmin is a php web application which let us manage a MariaDB/MySQL database from an intuitive graphical interface. The application is not provided in the RHEL 8 / CentOS 8 official repositories, and is usually installed from third party sources like EPEL. Epel-8 is, however, not yet available, so in this tutorial we will see how to fetch the upstream phpMyAdmin code and install it on our system "manually".

In this tutorial you will learn:
  • How to download and install phpMyAdmin from source
  • How to verify the downloaded archive
  • How to access the phpMyAdmin configuration wizard
The phpMyAdmin login page

HAProxy or High Availability Proxy is an open source TCP and HTTP load balancer and proxy server software. HAProxy has been written by Willy Tarreau in C, it supports SSL, compressions, keep-alive, custom log formats and header rewriting. HAProxy is a fast and lightweight proxy server and load balancer with a small memory footprint and low CPU usage. It is used by large sites like Github, StackOverflow, Reddit, Tumblr, Twitter and others. It has become the most popular software load balancer and proxy server in the past years.

In this tutorial, you will get through the HAProxy installation and configuration on RHEL 8 / CentOS 8. We will install HAProxy on a single server and then install Nginx web server on the other servers. HAProxy will act as a load balancer for the Nginx web servers.

In this tutorial you will learn:

  • HAProxy Architecture and Concepts
  • Configure hosts file for name resolution
  • Install and Configure HAProxy
  • Install and Configure Nginx
  • Testing the Load Balancing feature
  • Access the HAProxy Stats URL

P7Zip is required to extract certain archive files, especially the .7z kind. It isn't available in the RHEL 8 repositories, so you're going to need to get it elsewhere. For that, there are two options, the EPEL and building it from source. Both work well.

In this tutorial you will learn:
  • How to Install P7Zip From the EPEL
  • How to Download the P7Zip Source
  • How to Install the Build Tools
  • How to Build and Install P7Zip
  • Basic examples on how to extract and compress 7z files

In the RHEL 8 / CentOS 8 Linux systems, the way software is organized has changed: critical packages are now contained in the BaseOs repository, while the AppStream one contains multiple versions of some of the most common used applications and programming languages which are organized in modules, and updated independently of the distribution release cycle. This strategy has been adopted in order to avoid the problem of being stuck with a certain, too outdated or too recent release of a certain software.

In this tutorial you will learn:
  • How to install PHP on RHEL 8 / CentOS 8
  • What are software modules in RHEL 8 / CentOS 8
  • How to install and switch between different versions of the PHP module
Available php modules on RHEL 8

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