- Details
- admin
- Redhat / CentOS
hostname of your CentOS 7 Linux is defined by the file /etc/hostname thus setting a new hostname for your system is just a matter of editing this file and replace a current hostname definition line with new one. However, doing so will not update your system;s hostname immediately thus a preferred way of changing a hostname on CentOS 7 Linux is to use nmtui and more specifically its child nmtui-hostname. Using nmtui-hostname tool will make the process of changing your hostname rather simple as executing a single command. The following linux command will change the hostname to linuxconfig.org:
# nmtui-hostname linuxconfig.org
- Details
- Lubos Rendek
- Redhat / CentOS
sudo command allows regular users to execute commands with administrative/root privileges. By adding any user to predefined sudo group wheel will grant root privileges to execute any command as root user. Any attempt to use the sudo command for the non-sudo user will result in:
user is not in the sudoers file. This incident will be reported.In this tutorial you will learn:
- How to create sudo user on RHEL 8 / CentOS 8 system.
- How to add existing user to sudoers.
- Details
- Lubos Rendek
- Redhat / CentOS
firewalld firewall. The FTP protocol is primarily used by file transfer services such as, but not limited to, vsftpd FTP server. For more information visit our introduction guide to firewalld syntax and usage guide.
In this tutorial you will learn:
- How to open FTP port 21.
- How to open FTP port 21 permanently.
- How to list currently open ports/services.
- How to close/remove open FTP port 21.
- Details
- Lubos Rendek
- Redhat / CentOS
systemctl command.
In this tutorial you will learn:
- How to enable service to start on boot.
- How to list all services on systemd Linux system.
- Details
- Lubos Rendek
- Redhat / CentOS
firewalld firewall. HTTP and HTTPS protocols are primarily used by web services such as, but not limited to, Apache or Nginx web serves.For more information about the
firewalld firewall visit our introduction guide to firewalld syntax and usage guide.
In this tutorial you will learn:
- How to open HTTP port 80 and HTTPS port 443.
- How to open HTTP port 80 and HTTPS port 443 permanently.
- How to list currently open ports/services.
- How to close/remove HTTP port 80 and HTTPS port 443.
- Details
- Thomas Sandmann
- Redhat / CentOS
In this tutorial we will learn how to install Apache Tomcat 8 application container to RHEL 8 / CentOS 8. We will be using the zip package available to download from the Apache Tomcat website. As this package will not handle setting up the environment, we will create it from the command line.
In this tutorial you will learn:- How to install Apache Tomcat from zip file
- How to create the environment for the Tomcat server from command line
- How to add basic service file to systemd
- How to enable autostart, start and stop the Tomcat server
- How to verify Tomcat is reachable
- Details
- Lubos Rendek
- Redhat / CentOS
In this tutorial you will learn:
- How to open and close ports on RHEL 8 / CentOS 8 with Firewalld.
- How to open and close services on RHEL 8 / CentOS 8.
- How to reload firewall configuration.
- How to list open ports or services.
- Details
- Lubos Rendek
- Redhat / CentOS
The nftables framework replaces iptables as a default network packet filtering feature on RHEL 8.
# firewall-cmd --list-all public (active) target: default icmp-block-inversion: no interfaces: enp0s3 sources: services: cockpit dhcpv6-client ssh ports: protocols: masquerade: no forward-ports: source-ports: icmp-blocks: rich rules:In this tutorial you will learn:
- How to check the firewall status onRHEL 8 / CentOS 8.
- How to stop firewall on RHEL 8 / CentOS 8.
- How to start firewall on RHEL 8 / CentOS 8.
- How to permanently disable firewall on RHEL 8 / CentOS 8.
- How to enable firewall to start after reboot.
- Details
- Lubos Rendek
- Redhat / CentOS
timedatectl.
In this tutorial you will learn:
- How to retrieve current timezone.
- How to change/set timezone.
- Details
- Lubos Rendek
- Redhat / CentOS
There are several ways on how to check what version of CentOS is running on your system. The simplest way to check for the CentOS version number is to execute the cat /etc/centos-release command. Identifying the accurate CentOS version may be required to help you or your support team to troubleshoot your CentOS system.
- Details
- Fabrizio Pani
- Redhat / CentOS
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:- How to install a DNS server in RHEL 8 / CentOS 8
- How to configure a server as caching only DNS Server
- How to configure a server as single DNS Server
- Details
- Răzvan T. Coloja
- Redhat / CentOS
Minecraft is still a popular game these days. The simplicity of its graphics had an appeal on gamers of all ages and there are many hundreds of thousands of players worldwide, most of them playing on online servers. But did you know you can create your own Minecraft server using RedHat Enterprise Linux 8? Here is a how to teaching you exactly how to do it.
In this tutorial you will learn:- How to install Java
- How to download and run a Minecraft server
- How to create a user for the Minecraft server
- How to open the Minecraft port
- Details
- Răzvan T. Coloja
- Redhat / CentOS
Most IPs these days are automatically assigned through DHCP by either your ISP or your home router. But there may come a time when you wish to opt for a static IP address and you will want to change it. It may be that you are configuring a home LAN and you don't want to use DHCP or simply want a static IP address that you can access from outside your home. In this tutorial we will learn how we can change the IP address in RHEL 8 / CentOS 8 Linus system.
In this tutorial you will learn:- How to change the IP address in RHEL 8 / CentOS 8 using GNOME
- How to change the IP address by editing configuration files
- How to manually change your DNS server
- How to restart networking in RHEL 8 / CentOS 8
- Details
- Răzvan T. Coloja
- Redhat / CentOS
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:- How to configure a virtual machine in VMWare Workstation 15
- How to prepare the partition for Red Hat Linux 8.0
- How to install Red Hat Enterprise Linux 8.0 in VMWare Workstation 15
- Details
- Egidio Docile
- Redhat / CentOS
Node.js is a Javascript runtime environment based on the V8 open source engine made
by Google and originally used in Chrome. Thanks to Node.js we can run Javascript outside of the
browser context, and use it also like a server-side scripting language, thus
creating an entire web application around it. In this tutorial we will see how to install Node.js in the
RHEL 8 / CentOS 8 distribution.
- How to list the available Node.js versions on RHEL 8 / CentOS 8
- How to install a specific version of Node.js
- How to switch between Node.js versions on RHEL 8 / CentOS 8
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