Chrony - NTP server source list on Red Hat Enterprise Linux 8.

How to configure NTP server on RHEL 8 / CentOS 8 Linux

Chrony is a default NTP client as well as an NTP server on RHEL 8 / CentOS 8. This article will provide you with an information on how to perform an installation and basic configuration of an NTP server or client on RHEL 8.

In this tutorial you will learn:

  • How to install NTP server on RHEL 8 / CentOS 8.
  • How to install NTP client on RHEL 8 / CentOS 8.
  • How to open firewall to incoming NTP requests.
  • How to configure Chrony as NTP server.
  • How to configure Chrony as NTP client.

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Nmap command on RHEL 8 Linux Server/Workstation

Install nmap on RHEL 8 / CentOS 8

The nmap command is an invaluable tool for any system or network administrator. This command is not available on RHEL 8 / CentOS 8 default installation. However, it can be installed with a single dnf command.

In this tutorial you will learn:

  • How to install Nmap command on RHEL 8 / CentOS 8.
  • How to to check Nmap version on RHEL 8 / CentOS 8.

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Snmpd answer to remote query with snmpwalk.

How to install snmp on RHEL 8 / CentOS 8

SNMP (Simple Network Management Protocol) is widely used for monitoring and central management purposes. In this tutorial we will install the snmpd service to a RHEL 8 / CentOS 8 machine, enable autostart, and after starting the service, we will test the functioning service with snmpwalk running the default settings.

In this tutorial you will learn:

  • How to install snmp service
  • How to start and enable the service with systemd
  • How to open udp port 161 for remote access
  • How to test the service with snmpwalk from localhost and remove machine

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Using dnf you can search for available wireless drivers in the RHEL 8 / CentOS 8 repositories

How to install wireless driver in RHEL 8 / CentOS 8 Linux

Most laptops and mobile devices these days have a wireless card. Mobile connectivity is important more than ever. If twenty years ago Linux barely had enough drivers for a handful of on-board ethernet cards, now the wireless drivers embedded in the kernel grows with every kernel release. Further than that, hardware companies release their products together with Linux drivers, be they closed or open-source. In this article we will take a look at how to install wireless drivers in RHEL 8 / CentOS 8.

In this tutorial you will learn:

  • How to install wireless drivers using dnf
  • How to install manually downloaded wireless drivers

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Enabled IPv6 on RHEL 8 Linux system.

RHEL 8 / CentOS 8 enable/disable IPv6

An Internet Protocol Version 6 (IPv6) address is an identifier of a network interface of a computer or a network node involved in an IPv6 computer network. This article will guide the user via simple steps on how to disable or re-enable IPv6 network addresses on RHEL 8 / CentOS 8. To temporarily enable/disable the IPv6 address on RHEL 8 / CentOS 8 we will use the sysctl command. Additionally, to permanently disable the IPv6 address we will modify the GRUB boot options.

In this tutorial you will learn:

  • How to temporarily disable the IPv6 address.
  • How to permanently disable IPv6 by modifying the GRUB boot options.

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Opening and Closing firewall ports on RHEL 8 / CentOS 8 using firewall-cmd command.

How to open and close ports on RHEL 8 / CentOS 8 Linux

Firewalld is a powerful and yet simple to use tool to manage a firewall on RHEL 8 / CentOS 8 Server or GNOME workstation. Firewalld allows to manage open or close ports using predefined services as well as open and close user custom ports.

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.

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RHEL 8 - HTTP & HTTPS protocol services. Open ports 80 & 443

RHEL 8 / CentOS 8 open HTTP port 80 and HTTPS port 443 with firewalld

This article explains how to open HTTP port 80 and HTTPS port 443 on RHEL 8 / CentOS 8 system with the 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.

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RHEL 8 / CentOS 8 - FTP protocol service. Open port 21

RHEL 8 / CentOS 8 open FTP port 21 with firewalld

This article explains how to open FTP port 21 on RHEL 8 / CentOS 8 Linux system with the 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.

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Changing the IP address in RHEL 8 from within GNOME is a matter of a few clicks

How to change IP address on RHEL 8 / CentOS 8 Linux

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

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