As more and more applications move towards a RESTful architecture, it becomes increasingly important to ensure that the data being exchanged between the client and the server is valid. In this article, we will look at how to implement validation for RESTful services with Spring. What is Validation? Validation is ... Read More

If you're new to CentOS 7, one of the first things you'll want to do is learn how to add users to the sudoers file and the sudo group. This will give them elevated privileges and allow them to run commands with root-level permissions. In this article, we'll walk you ... Read More

Veeam Cloud Connect is a powerful feature that allows users to easily and securely backup and replicate their data to a cloud service provider. PhoenixNAP is a popular Veeam Cloud Connect service provider that offers reliable and cost-effective cloud backup and replication services. In this article, we will guide you ... Read More

Ubuntu is one of the most popular Linux-based operating systems used by millions of people around the world. It is known for its ease of use, reliability, and security features. One of the most important features of Ubuntu is its package management system, which allows users to easily install, update, ... Read More

Linux is a powerful and flexible operating system that is widely used in server environments. In these environments, it is common for multiple users to work on the same system and even belong to the same user groups. However, there may come a time when you need to remove a ... Read More

Fedora is a popular operating system that is known for its stability, security, and user-friendly interface. One of the many features that make Fedora stand out from other operating systems is the ability to add new fonts easily. Fonts play an important role in the overall look and feel of ... Read More

Introduction Nagios is an open-source monitoring system that helps system administrators to monitor the performance and availability of various network resources, including hosts, services, and network devices. It is an efficient tool that allows monitoring and notification for a wide range of devices and services in the network. NRPE (Nagios ... Read More

If you're looking to land a job in a Linux environment, you're likely to be asked a lot of technical questions during the interview process. One of the most important commands in Linux is the "ls" command, which is used to list the contents of a directory. In this article, ... Read More

OpenNMS is an open-source monitoring system that helps system administrators monitor their networks, servers, and applications. It provides comprehensive monitoring capabilities that allow administrators to detect and resolve issues before they become critical. In this article, we'll discuss how to add hosts in OpenNMS monitoring server. What are Hosts? Hosts ... Read More

In today's world, email is a crucial tool for communication, both in personal and professional settings. However, it can also be a target for malicious attacks such as viruses and spam. As a result, it is vital to secure your mail server against these threats. One way to do this ... Read More