This guide will show how to install and configure a DNS Server in RHEL 8 / CentOS 8 in caching mode only or as single DNS Server, no master-slave configuration. A reverse and forward zone example is provided.
In this tutorial you will learn:
This article will describe how to install the open source communication software Asterisk on RHEL 8 / CentOS 8; due to the fact that Asterisk and other important dependencies are not available as RPM packages from the repositories, it is needed to compile them from sources.
In this tutorial you will learn:
Virtualization and emulation software is big these days. With cheaper RAM memory comes the possibility to ditch dual-booting and install several operating systems in QEMU or VMWare and use them alternatively whenever you feel like it. Since Red Hat Enterprise Linux 8.0 is fresh you might want to test it in VMWare before installing it on its own partition. So here is a guide to do just that.
In this tutorial you will learn:
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.
In this tutorial you will learn:
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:
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:
The work towards a new Ubuntu release has started. The new Ubuntu 19.04 is expected to be released in April 2019. However, there is no need to wait until then.
If you feel adventurous you can upgrade to Ubuntu 19.04 today. All you need is to have fully upgraded and updated Ubuntu 18.10 Cosmic Cuttlefish at your disposal.
In this How To Upgrade Ubuntu To 19.04 Disco Dingo tutorial you will learn:
In this article we will be installing WordPress.com Desktop Client app on Ubuntu 19.04 Disco Dingo Linux
In this tutorial you will learn:
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:
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:
The unmanaged network issue occurs when on previously GUI less Debian system the GUI and the Network Manager is installed. The reason is that Network Manager has been denied access to network management.
As you will see below, the unmanaged network issue can easily be fixed by editing the main NetworkManager’s configuration file /etc/NetworkManager/NetworkManager.conf.
In this tutorial you will learn:
