GNOME is the default desktop environment on AlmaLinux, but only if you opt for the full installation of the operating system. Other installations don't include any GUI by default. If you've chosen a minimal install but don't want to be limited to just the command line, you can install the GNOME desktop environment in a few simple commands.
In this guide, we'll show you the step by step instructions to install the GNOME GUI on AlmaLinux. Follow along with us on your own system to get it setup.
In this tutorial you will learn:
How to install GNOME desktop environment on AlmaLinux
How to make GNOME launch by default upon system boot
AlmaLinux is a Linux distribution based on Red Hat Enterprise Linux and maintained by CloudLinux, a company that provides server hosting and Linux software. For other most popular Linux distributions, please visit our dedicated Linux download page.
The motivation behind Alma's release is to serve as a viable replacement for CentOS at the time of its shift from an enterprise-stable operating system to an upstream development branch of RHEL. Users can even switch from CentOS to AlmaLinux with just one command that will swap repositories and keys.
AlmaLinux functions very similarly to RHEL, but it's completely free. It's marketed to users and companies that need enterprise-level stability in a Fedora-like operating system. In other words, companies that want to use Red Hat but don't want to pay the subscription fee and/or don't need tech support can use AlmaLinux to fill the gap.
Being based on RHEL naturally makes AlmaLinux more geared towards servers and workstations, though it can still work well as a desktop operating system for some people. The full installation comes with the GNOME desktop environment and proves easy enough to use, but Linux newcomers will find a more welcoming experience in a user friendly distro like Ubuntu.
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.
GNU/Linux filesystem permissions and rights are the basis of the system's security, and one of it's principles is the clear separation of rights to files and folders. In a heavily multiuser environment, such as a school's server, file rights prevent a user by default to accidentally delete or overwrite another's documents. However, there are use cases where multiple users need to access (read, write, and even delete) other user's files - such may be the case in the above mentioned school server, where students work on the same project. In this section of RHCSA exam preparation we will learn how to create an environment for such collaboration, using the setgid (set groupID) technique. Note that while we perform these steps on a recent operating system, the setgid isn't a new thing, and you will find it in any and all distributions.
In this tutorial you will learn:
How to add users to a supplementary group
How to use set-GID on a directory
How to check proper ownership within the set-GID directory
How to use the special directory as a member of the group
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.
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.
Red Hat Enterprise Linux is a commercial Linux distribution built for powering the servers of corporations and data centers. It's a robust distro with the features and stability that businesses crave for high availability and predictability.
The big appeal of Red Hat, though, is its support system. That's the main thing you're paying for, after all. If something doesn't operate as expected, businesses want someone to turn to for support so they can face as little downtime as possible. Red Hat experts are only a phone call away for subscribers.
The support feature is what really sets Red Hat apart from other Linux distributions that could also perform the same job very well, such as CentOS, Fedora, and OpenSUSE. For other most popular Linux distributions please visit our dedicated linux download page.
Red Hat offers training and certification programs to prospective Linux system administrators. This is another big plus for businesses, as they can buy training for their employees or vet new recruits by their certifications. Such training and certifications are rare to find in the Linux world, being that Linux distros are mostly free and run by a community of volunteers.
If you are a system administrator looking to get into Red Hat, most or all of your experience with CentOS and Fedora Server should transfer over to Red Hat, since the three distributions are closely related.
CentOS is one of the leading Linux distributions available. It's developed by The CentOS Project, which is an affiliate of Red Hat. As CentOS is based on Red Hat Enterprise Linux, it's naturally more geared toward servers and workstations, though it can still work well as a desktop operating system for some people. For other most popular Linux distributions please visit our dedicated linux download page.
CentOS excels at being very stable and predictable, the exact qualities you'd hope to find in a server OS. It's very similar to RHEL in most respects except that it's completely free. If a user or organization needs a reliable distribution and can do without the commercial support that RHEL provides, CentOS is a perfect choice.
Apache Hadoop is an open source framework used for distributed storage as well as distributed processing of big data on clusters of computers which runs on commodity hardwares. Hadoop stores data in Hadoop Distributed File System (HDFS) and the processing of these data is done using MapReduce. YARN provides API for requesting and allocating resource in the Hadoop cluster.
The Apache Hadoop framework is composed of the following modules:
Hadoop Common
Hadoop Distributed File System (HDFS)
YARN
MapReduce
This article explains how to install Hadoop Version 2 on RHEL 8 or CentOS 8. We will install HDFS (Namenode and Datanode), YARN, MapReduce on the single node cluster in Pseudo Distributed Mode which is distributed simulation on a single machine. Each Hadoop daemon such as hdfs, yarn, mapreduce etc. will run as a separate/individual java process.
In this tutorial you will learn:
How to add users for Hadoop Environment
How to install and configure the Oracle JDK
How to configure passwordless SSH
How to install Hadoop and configure necessary related xml files
Redmine is a popular open source project management web application. It supports mayor databases like MySQL and PostgreSQL as backend, and you can also change the frontend to Apache from the WEBrick (recommended for production use) webserver shipped with the installation. In this article we will install the latest Redmine on RHEL 8 / CentOS 8, using PostgreSQL as backend, but we will leave the default WEBrick as frontend, which will serve our tests perfectly.
Do not expect this process to be an easy one, nor error-free. Even following these steps to the letter, some errors will surely happen, the setup seem to handle sudo steps somewhat inconsistently - but the solutions are also included which will guide trough these errors.
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.
When speaking of virtualization, VMware is a solution that can't be ignored. While the true power of virtualization lives in the datacenters, we live in the age where anyone can run a virtual machine or two on a desktop or a laptop, given it is equipped with enough resources. These virtual machines are computers running inside a computer, and this setup has countless benefits and use cases. For instance, if you have a new software you'd like to test, you can do so in a virtual machine before installing it directly on a device you use for everyday work.
To work with these virtual machines with ease, we can integrate them with our Hypervisor - in this case, VMware - to enable the operating system running as guest to use the capabilities of the virtualization software. In this tutorial we will install the integration software, called VMware Tools on a virtual machine running RHEL 8 / CentOS 8, that is hosted in VMware Player. The same in-guest steps apply on the datacenter version of VMware regarding the tools installation. Note however, that Red Hat ships the open-vm-tools with the distribution, which is what VMware also recommends to use instead of the tools we'll now install. Why are the tools shipped with the distribution recommended? They can be updated along with the distribution within the regular update process, while VMware's tools need to be updated by hand (or automation, but unneeded effort anyway).
While the following steps will result in a working integration, please consider the above when you setting up your virtual systems. Outdated virtualization integration tools are a bad thing, which you will experience when you upgrade your hosts, and hundreds of alerts will appear on the vCenter consoles.
In this tutorial you will learn:
How to download VMware tools using VMware Player
How to present installation source to the virtual machine
Disk and space management is an essential knowledge of a sysadmin. It is his or her everyday job to handle disk issues. As part of the RHCSA exam preparation, we will learn how to add new space of various types to the system, using the tools provided by RHEL8. We already covered many of these tasks, and in this tutorial we will focus on adding new space without harming the data contained in the system.
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.
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.
