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Apt-Cacher-NG is a proxy server for Linux package repositories that caches downloaded packages locally. This reduces bandwidth usage and speeds up package installations across multiple Ubuntu systems by serving cached packages instead of downloading them repeatedly from remote repositories. How Apt-Cacher-NG Works When a client requests a package, Apt-Cacher-NG checks if it exists in the local cache. If found, it serves the cached version immediately. If not, it downloads the package from the upstream repository, caches it locally, and then serves it to the client. All subsequent requests for the same package are served from the cache. ... Read More
PXE (Preboot eXecution Environment) Network Boot Server enables client machines to boot over the network and install Linux distributions without physical installation media. In RHEL/CentOS 7, this requires setting up DHCP, TFTP, and Syslinux services to serve boot files and installation images to client systems. The setup involves installing required packages (DHCP, TFTP, Syslinux), configuring the DHCP server to provide IP addresses and boot parameters, setting up the TFTP server to serve boot files, and creating bootloader menus for multiple Linux distributions. Methods Used Manual Configuration − Step-by-step setup of individual services Automated Tools − Using ... Read More
Setting up a secure FTP server using SSL/TLS on Ubuntu is essential for protecting data transmission from unauthorized access. By implementing SSL/TLS encryption, all data transferred between the FTP client and server is encrypted, ensuring confidentiality and security. This article covers two popular FTP server implementations: vsftpd and Pure-FTPd. Methods Used Using vsftpd Using Pure-FTPd Using vsftpd Vsftpd (Very Secure FTP Daemon) is a lightweight and secure FTP server for Linux systems. To configure SSL/TLS support, we need to install the necessary packages, generate SSL certificates, and configure the server settings. Step-by-Step Configuration ... Read More
Setting up email services involves configuring SMTP (Simple Mail Transfer Protocol) for outgoing mail, IMAP (Internet Message Access Protocol) for retrieving emails from clients, and IMAPS (IMAP over SSL) for secure encrypted access. This enables users to send and receive emails through their preferred mail clients. Restricting access to SMTP involves implementing security measures to prevent unauthorized usage, such as enabling authentication for sending emails, implementing IP-based restrictions, and utilizing encryption protocols like TLS. Email Service Architecture Email Service Architecture Mail Client SMTP (Port ... Read More
NFS (Network File System) with Kerberos authentication provides a secure file sharing solution for Linux environments. This configuration ensures data integrity and authentication by requiring clients to obtain Kerberos tickets before accessing shared directories. The setup involves installing NFS and Kerberos packages, creating security principals and keytabs, configuring exports, and establishing proper firewall rules for secure communication. Configuration Approaches There are two primary methods for setting up NFS with Kerberos authentication: Automation with Configuration Management Tools − Using Ansible, Puppet, or Chef for consistent deployments Manual Configuration Approach − Step-by-step manual setup for smaller environments ... Read More
Network Time Protocol (NTP) is a networking protocol used to synchronize the clocks of computers over a network. Setting up an NTP server in RHEL/CentOS 7 allows you to provide accurate time synchronization to client devices across your network infrastructure. Prerequisites Before configuring the NTP server, ensure you have root privileges and network connectivity to external NTP sources. The server should also have proper DNS resolution configured for accessing public NTP servers. Install NTP Package First, install the NTP package using the YUM package manager. This provides the necessary software components to run an NTP server ... Read More
To configure LDAP-based authentication in RHEL 8, install required packages, adjust configuration files, and configure LDAP server details in sssd.conf. To apply the modifications, restart the sssd service after that. Finally, login using an LDAP user account to check the LDAP authentication. User authentication across several systems is made simpler with LDAP-based authentication, which offers a centralised user management solution. What is LDAP? LDAP (Lightweight Directory Access Protocol) is a standardized protocol used in RHEL 8 Linux to configure directory-based authentication. It provides a defined method for accessing and managing directory information, including user accounts and their attributes, ... Read More
An operating system (OS) is a group of programs that controls computer hardware resources and offers standard services to software applications. It serves as a conduit between the user and the hardware. Kali Linux and Parrot OS are both Debian-based Linux distributions specifically designed for cybersecurity professionals, penetration testing, and digital forensics. What is Kali Linux? A Debian-based Linux distribution called Kali Linux is made specifically for penetration testing and digital forensics. It is supported and maintained by information security training provider Offensive Security. Mati Aharoni and Devon Kearns of Offensive Security rewrote BackTrack to create Kali Linux. ... Read More
Monitoring the performance and health of your CentOS 7 server is essential for maintaining its stability and optimizing its resources. In this article, we will explore how to install and configure Glances, InfluxDB, and Grafana—a powerful trio of monitoring tools—to gather system metrics, store them in a time-series database, and visualize them in real-time dashboards. Monitoring Stack Architecture Glances Data Collection InfluxDB Data Storage Grafana Visualization ... Read More
GNUMP3d is a lightweight and easy-to-use streaming media server that allows users to share and stream their music collection over the internet. It supports various platforms, including RHEL, CentOS, Fedora, Ubuntu, and Debian. This article will guide you through the installation process of GNUMP3d on these Linux distributions, along with configuration examples and troubleshooting tips. Prerequisites Before proceeding with the installation, ensure you have the following prerequisites − A running instance of RHEL, CentOS, Fedora, Ubuntu, or Debian. A user account with sudo privileges. A music collection stored in a directory accessible by the system. ... Read More