Xali Tech

Setup Wireguard Server in one shot on Debian/Ubuntu

This is short article consist of bash script for creating WireGuard server with listed clients in sigle shot. Before running this script make sure: Set your server's public IP.Update list of clients you need to generate.Create bash file such as 'wg-script.sh', set execute permissions & run the

VPN

Wireguard VPN Server on AWS Lightsail

WireGuard is fast, simple and modern VPN protocol. In this article we are going to setup WireGuard VPN system, with server running on AWS Lightsail & few clients securely connected to server. Here is top-level overview of the VPN system we are going to build in this article. Overview -

VPN

Setup WireGuard VPN Server in Azure Cloud

WireGuard is an extremely simple, fast and modern open-source Virtual Private Network (VPN) implementation. It is a VPN protocol based on modern cryptographic technology. WireGuard uses state-of-the-art cryptography, like the Noise protocol framework, Curve25519, ChaCha20, Poly1305, BLAKE2, SipHash24, HKDF etc. which makes it secure choice based on modern cryptography standards.

GraphQL

GraphQL: How to convince your boss?

GraphQL in simple words is query language for APIs and a runtime to fulfill those queries. GraphQL is emerging technology originally developed by Facebook in 2012 and open sourced later in 2015. Today GraphQL is being used by many companies in verity of applications ranging from small, medium and large-scale.

Information Technology

Technology Startup: Hypothetical example zsoftsolutions.com

ZSoft Solutions is start-up Software Company whose vision is to deliver software products and services of various scales. These products range from websites, software as service (SaaS) applications and mobile apps to large scare high traffic applications. ZSoft Solutions is customer oriented company focus on suprior quality of products and

AWS

Setup Ghost blog on AWS Lightsail

In this article we are going to talk about how to set up Ghost blog on AWS Lightsail. Ghost is professional publishing platform for building and running modern publications. You might be wondering why do we need to create our own when services like Ghost Pro and Wordpress.com are

UML

Requirements Modeling in Software Projects

Requirements gathering in software engineering is process of identifying requirements & real-world use-case of software system to be built. This modeling process consist of various type of modeling technique such as scenario based, class based, behavior oriented, flow oriented or data oriented modeling. Scenario-Based ModelingThis is typically the first stage

Programming

Why we need Development, Staging, and Production environments for software development?

Typical software development workflow consists of more than one environment to facilitate development, testing, deployment and releases of software application smoother and hassle free. This model typically consists of development, staging and production environments, sometimes it is also called DSP, the whole idea of having separate environments for different phases

Databases

Replication and Sharding in MongoDB

There are two replication models used in NoSQL databases, master-slave and master-master. In master-slave replication, all write operations are performed on master copy and then propagated to slave copies while in master-master write operations can be done on both master copies, but read operations are not guaranteed to be consistent

Project Management

Project Risk Management

Project management is a complex set of processes and procedures performed to achieve features planned in the project. In other words, project management is a process of planning, initiating, executing and controlling a set of activities done in harmony to achieve functionalities of the project planned. Risk in any unexpected

Project Management

Challenges in Software Project Management

A project can be defined as unique one time work to be done for solving some problem or achieving some objective. This dynamic nature of projects make the project management discipline very challenging and project managers very demanding. Project manager’s primary job function is to manage time and resources

Project Management

Project Metrics

A project metric is measurement of quantifiable activities of project management and it’s also denoted as key performance indicator (KPI). Project metrics measures the progress of the project within specified set of activities in project plan. A metric is unit of measure which project managers can use to collect

Project Management

Project Cost Management (PCM)

The Project Cost Management is very important pillar of project management activities, a successful project must have realistic risk management & cost management plans. The Cost Management consist of set of activities that ensures that the project is completed within the allocated budget and time. Projects initiated without proper cost

Project Management

Project Initiation Phase

Project Initiation process starts with establishing objectives. That's when project managers meet and decide which information they need from project. The number of objectives varies from company to company, for example a small company may have single objective defined for a project i.e. a marketing manager may want to

Project Management

Project Management Triangle (Triple Constraint)

Project Management Triangle also known as triple constraint of Project Management is a constitution of the three most key and contrasting constraints that nearly all projects have to undertake. Almost everyone familiar with project management, has perhaps heard of the famous term Triple Constraint. Usually, you cannot change one of

Information Security

Building blocks of Network Security

Digital security in modern day world is essential need of any type of business and personal use of internet and communication systems. In typical network environment various subsystems collaborate to run business operations which generates data and transactions in day-to-day business, all these operations are done using some software and

Information Security

Information Access control

Information Access control in network security is the process of restricting or limiting access of any object to the resource, in digital world authenticating and authorizing use access to data is comes under access control. “Access control is the technical mechanism that restricts unauthorized users from the system, grants access

Information Security

Types of Cryptographic Algorithms

Cryptography is technique used to securely transmit data from source to remote destination. The basic purpose of cryptography in modern day digital world is, security, privacy, authenticity and integrity. A cryptographic algorithm is mathematical formula used to covert plain data into cipher-data and vice versa or in other words encryption

Information Security

Physical Security Models

Security in general and physical security in particular is very crucial for any origination. Origination’s information security policy holds key to securing organization assets. Security controls can be categorized into three models, administrative controls, physical controls and technical controls, these controls are generally the first line of defense in

Information Security

Cloud Computing

Cloud computing is paradigm in Information Technology (IT) which enables virtualizing physical computing resources over remote network like internet; these resources include operating systems, servers, physical configurable machines, networks, database and software etc. The term cloud is referred to internet’s virtual bubble. These cloud services are provided by commercial

Networking

Types of Multiplexing

Multiplexing is the process of sending data from multiple source over shared physical medium, multiplexer is used to represent multiplexing mechanism. Similarly, demultiplexing is inverse process of multiplexing; demultiplexer separates data received from multiple sources and sends to intended receivers; demultiplex is technique used to denote demultiplexing. There are four

Networking

What is the difference between guided and unguided transmission?

Transmission media in general, is term referred to path between sender and receiver participating in network communication. Guided transmission media and Unguided transmission media are terms used to differentiate cable from wireless communication mechanism. If you categorize transmission by energy then it can be electric signal, radio wave or light.

Databases

What is Database Administration

Databases are integral part of any Information Technology (IT) system, with advancement in technology these IT systems are getting more and more involved in people everyday life. IT is involved in every aspect of life such as food such as online food delivery, travel online booking, hospitals system, social media

Databases

A complete database example using SQL Server

In this article we are going to create a hypothetical company database system with end-to-end workflow. We are going to start with Entity Relationship Diagram (ERD), then we will create database using SQL script and finally run some queries to test workflow. You need MS SQL Server & Management Studio

What is the difference between primary and secondary storage?

Primary StoragePrimary Storage, refers to computer storage which is directly access or manipulated by Central Processing Unit (CPU) or Processor. This type of storage includes Random Access Memory (RAM) and fast Cache storage. Primary Storage is generally very fast but expensive storage, since modern processors are very fast and required