DEV Community: Isdonobi

THE VIRTUAL MACHINE - TYPES AND HOW TO SETUP A VIRTUAL MACHINE

Isdonobi — Fri, 28 Jan 2022 08:12:26 +0000

What comes to your mind when you hear the word virtual? Basically, a logical representation of a physical thing. This applies to the computer world also, when something is said to be virtual, it simply means a logical representation of a physical thing created in a computer through software. To illustrate, take a look at the Ps4, the players aren’t the real players, but a virtual representation of the real players. Take a look at your photo album on your computer, it’s a virtual family. In the game “Temple Run” the person running and jumping is a virtual human being. In these illustrations, the football game, the family, and the person jumping and running are all created virtually using software on the computer.

      Virtual machine, commonly abbreviated as VM is no different from other physical computer like laptop, desktop, smart phone or server, it has a CPU (Central Processing Unit), memory and so much more. While the part that makes up your computer (called hardware) are tangible and physical, VM are often thought of as a software implementation of a physical computer. It creates an isolated duplication of a real computer and allows us to perform operations as we perform operation on a real computer.

      A VM is a software program that not only exhibits the behavior of a separate computer but also capable of performing task such as running it own programs and application like a separate computer. With a VM you can install one operating system in another operating system on same computer. To illustrate; you install a Linux operating system on your virtual machine on your windows operating system which happens to be your physical computer also known as the HOST.

Virtual hosts are able to share resources between multiple guests, or VM’s each with there operating system. The two basic type of VM are;

System Virtual machine
Process Virtual Machine

1. A SYSTEM VM

The System VM is also called hardware virtual machine. It is the software emulation of a computer system. It can also be referred to as a fully virtualized VM designed to be a substitute of a physical machine or acting as a substitute for the physical computer. To illustrate; you can install Windows XP/7/8 or Linux Ubuntu/Kali in Windows 10 operating system with the help of VM.

The system VM provides a platform for the execution of a complete operating system. It will create a number of different isolated identical execution environment in a single computer by partitioning computer memory to install and execute the different operating system at the time. Hardware resources are shared and managed, forming multiple environments on the host system. These very environments are isolated from each other but exist on the same physical host. It enables time-sharing among several single-tasking operating systems.

Bear in mind that to enable memory sharing between different virtual machine on one computer operating system, memory over commitment system can be applied. With memory pages having identical content, the memory pages can be shared among multiple VM which are present on the same host. But this is highly useful for read-only pages.

Examples of system VM

i.       VMware

ii.     VirtualBox

I. VMware

The VMware has two versions. The VMware player which is a free and basic version. The second is the VMware workstation which is a paid application and often time used in enterprise setting. The work station application provides all the benefit you could have on a VMware player and also includes the feature to clone machines. The VMware can run but on Linux and windows operating systems.

II. VirtualBox

VirtualBox is an easy user friendly VM application. It has large number of features that makes sustaining multiple virtual machines simple. It also allows files, drive and peripheral sharing with the host computer. The VirtualBox can be used on various application such as Mac Operating System, Windows Operating System and Linux Operating System.

2. Process Virtual Machine

 A process virtual machine is also called a language virtual machine or an application VM and sometimes it is been referred as Manage Run-time Environment. This type of VM runs as a normal application inside the host operating system, supporting a single process.
The purpose of a process VM is to perform a platform-independent programming environment that abstracts the details of the underlying hardware or operating system and also allows a program to execute in the same way on any platform. Process VM are implemented using an interpreter for improving performance.

Example of Process VM are

I. Java Virtual Machine (JVM)

II. Parrot Virtual Machine (PVM)

III. Common Language Runtime (CLR)

I. JVM

JVM is an abbreviation of Java Virtual Machine. It allows any system to run Java application as if they were native system. It also allows other programs written in other languages as far as they are compiled to Java bytecode.

II. PVM

The parrot VM is designed to efficiently compile and execute byte code for dynamic language. It is a host to various languages implementing in various stages of completion, including TCC, JavaScript, Ruby, Lua, Scheme, PHP, Python, Perl 6, APL and .Net bytecode translator.

III. CLR

This is the virtual machine component of Microsoft .Net framework. It manages the execution of .Net. Just-in-time compilation convert the manage codes (compiled into mediate language code), into machine instructions which are then executed on the CPU of the computer.

Let create a virtual machine with the following steps;

VM name: Web01

Region: Closest region to your location

No infrastructure redundancy required

Image: Windows Server 2019 Datacenter Gen1

Size Standard _DS1 with 1 VCPU 3.5 GB of memory

If you do not see that size, select the closest size available

Username: iisadmin

Password: Enter your desired password

Enter ports 80, 443, and 3389

Click review and create.

Connect to your web server via RDP.

Go to the Server Manager and add the IIS (Server Role).

After installation, go to file explorer and access the path %SystemDrive%\inetpub\wwwroot.

Add a file named “index.html” with the text

Welcome to my initial web page.

Do not worry about adding HTML /markup.

Test the website by going to the public IP address. You can access the public IP address from the Azure Portal, by going to the Overview section of the Virtual Machine

Here are the detailed step-by-step on how to complete the exercise:

Click on Search bar at the top of your Azure portal, type Virtual Machine and click on it.

Click on Ctreate > Virtual Machine

Subscription can be left on default - Azure Subscription 1. (just like the screenshot above.)

To create a new Resource Group click on Create New

Name the resource group Webservers

Next will be the Virtual Machine Name set to web01

The Region can be left at default but double check that it is the region that is closest to your location.

Availability options set it to No infrastructure redundancy required.

Security Type > Standard

Image use Windows Server 2019 Datacenter-Gen1

You might not see Gen1 so click on Configure VM generation > Generation 1 then go back to the image and use Windows Server 2019 Datacenter-Gen1.

Size use Standarrd_DS1_v2 - 1 vcpu, 3.5 GiB memory

If you do not see this size, you can choose the size in the standard section with the closest specifications.

Username use adminblock

Password use a password that meets the given requirements

Inbound Port Rules leave it at Allow Selected Port

Select inbound ports click on HTTP (80) HTTPS (443) RDP (3389)

Next is licensing Don't change options for the licensing.
Click on Review + create.

Next click on Create.

This might take a few seconds but once provisioning is complete you will get a page that says something along the lines of

Your deployment is complete.

Pat yourself on your back for getting to this point, You deserve it.

Next click on the button Go to resource.

Next On the top left click Connect and select RDP

To Connect with RDP:
IP address used Public IP address (102.133.184.189)
Port number is set to 3389.

Next Click on Download RDP file and open the file.

Next input your Password, the password that you created within the Azure Portal. (If this doesn't work, not to worry check the next screenshot)

Depending on your network you may need to click on More Choice then click on Use a different Account input the login credentials which you use on your Azure Portal: adminblock as the Username and the Password you setup.

Next click connect and yes to accept the certificate.

Ta-Da! you've created your first Virtual machine. Please give yourself a pat at the back.

Now lets create a Webserver

Login and Server Manager should be open. If not, you can click on the icon at the bottom middle

Next click on Add roles and features

Follow the wizard and leave all the settings in the default settings, keep clicking next until you get to Server Roles.

**Server Roles** select _**Web Server**_ (IIS).

Select Include management tools (if applicable)

Click Add features.

Click Next . The minimal features should already be selected and adequate.

Click Next till you get to Role Server

Scroll down, select IIS Management Console in Management Tools, then click Next.

Select Restart the destination server automatically if required, click on Yes then click Install.

The installation will take a few munities. Once the installation has completed, click Close.

Go to the main menu for you computer and search for inetmgr and open Internet Information Services (IIS) Manager

Click web01 (web01/iisadim) to open up the pane.
Click the arrow next to sites to access the default website.

Right click on the Default website.
Select Manage Website.
Select Advanced Settings.

Look for and copy the physical path which should be some thing like %SystemDrive%\inetpub\wwwroot

Open File Explorer

Click on This PC > Windows (C)

Click on inetpub

Click on wwwroot

Right click on the empty space and select New then click on Net Text Document.

Enter the following text with no markup into the text document.
"Welcome to my initial web page"

Click File and save as index.html
Change the Save as type as All Files.
Click Save

This will take precedents over the adminblock file and you should now see this page as your home page when you go to the public IP address.
Go to the main Menu of your Virtual Machine and click on internet explorer.

Impute the Public IP address from your RDP and click enter. You should see the home page you created with the text "Welcome to my initial web page"

If you got to this point, I want to say a big Well Done.

CLOUD COMPUTING MODELS, WHAT TO CHOOSE AND WHY

Isdonobi — Thu, 27 Jan 2022 14:54:36 +0000

Changes are happening and it’s happening very fast, businesses are been over stressed in maintaining a robust and cost-effective IT infrastructure, so as to adapt to the ever-growing changes.
Cloud services have been among the most popular platforms lately, with companies like Microsoft, Amazon, Google leading the way for technology growth.
Cloud computing is providing developers and IT departments with the ability to focus on what matters the must and remove layers of procurement, maintenance and capacity planning. Which will enable the organization to cut cost and minimize the time spent on mundane IT tasks.
Instead of maintaining hardware, you can focus on innovation and scale your application on demand. More and more enterprise are turning to cloud to enable them re-invent their applications and take advantage of a new deployment strategy. Which can help the organization save up to 30% by implementing a cloud-base service.
Cloud computing services comes mainly in three type of service models;

Infrastructure as a Services (IaaS)
Software as a Service (SaaS)
Platform as a Service (PaaS)

Each of this cloud models have its own set of benefits, which will serve the needs of various business. Choosing between them requires an understanding of these cloud models. When organization evaluate there needs and find out how a chosen model can deliver the organization set of wok flows.
The following are a brief description of the three types of cloud computing models.

1. IaaS

Infrastructure as a service sometimes abbreviated as IaaS, offers a standardized way of acquiring computing capabilities on demand and over the web, the IaaS cloud provider or vendor gives you an entire range of computing infrastructure such as storage, virtual servers, process power, networking hardware, along with maintenance and support.

2. SaaS

The model Software as a Service or SaaS, gives quick access to cloud-based web applications. The vendor controls the entire computing Stack. Which is accessible using a web browser.
This relieves your organization from the constant pressure of software maintenance, infrastructure management, network security, data availability and all the other issues involve with keeping application up and running. The SaaS billing is also a “pay as you go”, which is typically base on factors such as number of users, usage time, amount of data stored, and number of transactions processed. 
Development environments can also be done as SaaS. Software developers receive access to the platform where they can build, test and deploy a product, configure it functionality with build in tools and templates.
Examples of SaaS

1. Google Work Space

This top cloud service provide business with access to management, communication and organizational tools and uses cloud for data computing. Gmail, google drive, google form, google sheet, hangout are all SaaS tools that can be access anytime and anywhere.

2. Microsoft Office 365

The series of web services which gives business owner and individuals a platform with tools directly from their web browsers. Users can access Microsoft editing tools business email, communication instruments and documentation software.

3. Sales Force
This is the most popular CRM (customer Relationship Management) in the market that unites marketing, communication and e-commerce. Through cloud computing Sale Force have been able to use the benefits of SaaS to provide to various business access to its services and internal data. Business owners can keep track of there sales, client relations, communications and relevant tasks from any device. The interesting thing about sales force is that it can be integrated into the website. The information about incoming leads will be sent to the platform automatically.

3. PaaS

PaaS which is also stand for Platform as a Service is a halfway between IaaS and SaaS. It offers a partway to a service which allows organization of build, deliver and manage applications with out the need of installing and working with IDE’s (Integrated Development Environments) which are often very expensive. The PaaS model of service makes it easier for developers to focus on writing codes and create applications without worrying about time consuming IT infrastructure such as providing servers storage and backup.

Additionally, users can often customize the features they want included with there subscription. PaaS brings much more value to cloud, enabling organization to reduce their management overhead and lower cost. With the help of PaaS computing model, it is now easier for organizations to innovate and scale their services on demand.

A successful move to cloud isn’t about IaaS or PaaS or SaaS. For any organization, the trick is knowing which model suite your business needs.
To summarize, SaaS would suit your business well if you need cloud base software like email, CRM and productivity tools. IaaS is the perfect option if you require a complete virtual computing plat-form with powerful resources. If your requirement is to develop and test your software and applications, then it better to opt for PaaS. A long migration road map ad good planning will help you achieve value from the cloud.

AN OVERVIEW OF CLOUD COMPUING

Isdonobi — Wed, 26 Jan 2022 11:47:17 +0000

I remember the first time i heard about the cloud was icloud. It was fascinating for me, because how would someone save something in the cloud? Well at that point in time I thought my pictures, messages, contact and notes where stored in the literal cloud, and it was something I kept wondering how it’s been done. At that point I didn’t know that my contact, messages, notes and pictures where known as data. I merely refer to data as megabytes and gigabyte which is been given by my cell phone network provider and the amount of space my phone memory or memory card consumes

When I came to know about cloud, it was more astonishing and as I made my research and went through the learning process about cloud, I came to understand what cloud is all about, it functions and uses. Let’s talk about an overview of cloud to get the basic knowledge of cloud computing.

You might wonder what cloud is all about. Well, think of the cloud as a disk drive or hard drive that is own by a company like Microsoft or google, which stores all your files in a remote location, which can be called a server Farm. The cloud makes it possible to have access to your photos, videos or documents from any computer and sometimes a Smart phone or a tablet with an internet connection. Many of us make use of cloud computing every day with site like Facebook, Netflix or Gmail.

Let’s define cloud computing. Cloud computing simply means storing and accessing data and programs over the internet instead of the computer’s hard drive. Cloud computing can also be defined as hardware and software service from a provider over the internet.

The name cloud computing is influenced by cloud symbols, which is often been used to represent the service and networking infrastructure that makes up the internet as “the cloud” was often use as a slang in the world of tech. As more computing process moved to the servers and infrastructure part of the internet, people started making use of the word “the cloud” as a short hand to express where the computing process was taking place. Today people widely accept the term “the cloud” for this style of computing.

Examples of cloud computing you are probably using are;

GOOGLE DRIVE

   Google Drive is a purely cloud computing services. The storage is a free web-bases processor. One perk of Google Drive is the fact that it users do not need to download their project(s) to there computer. But can make necessary changes by editing and saving on the internet. Another interesting thing about the google drive is that several users are able to edit a document at the same time, with changes been visible by everyone in real-time. Most Google service can be classified cloud computing such as Gmail, Google Calendar, Google Map and so on. Google drive is not only accessible through the use of desktop computer, but also tablet and smart phones.

Apple iCloud

      The icloud is a computing services created by apple. Users are able to store, backup, and synchronize their mail, contact, calendar, photos, music, document and much more. Unlike Google Drive which merely requires internet access, iCloud requires an iOS, iPadOS, Mac OS or windows device (window users have to install the icloud control panel). The icloud computing application is more driven towards individuality rather that group work just like google drive.

Drop Box

      Operated by Drop Box inc, the service which is simple reliable for file-sync and can store files. It enables users to share certain file and folders across the internet, synching any change that are made in other to provide an opportunity for group collaboration.

Amazon Drive

     The cloud drive service was created by Amazon in 2011. The file which is been uploaded using a computer can be access via the internet. One of the positive of Amazon Drive can be found when a user wants to store large files.

Microsoft Azure

      The Azure cloud computing service has been regarded as one of the greatest cloud services platforms accessible, when you look at Microsoft’s extensive suite of services. The Microsoft Azure extensive list of offered services is sufficient to meet the demands of any company or organization in any sector.

Microsoft Azure cloud service was first published in 2010, and since then it has showed that it can be a reliable solution for businesses which are trying to digitally change. One of the interesting things about Microsoft Azure cloud computing service is that you man operate service on the cloud or mix them with any of your current infrastructures.


The cloud computing has taken away or reduce the presence of a physical storage which in turn safe cost. Since the cloud service providers mostly put their service on a pay as you go, which is cost effective for users. And the companies or organization don’t need to always update or maintain their own servers as the cloud vendor are willing to do that.

Now small business that might not be able to afford their own internal infrastructure can now outsource this infrastructure. The cloud has also made it easier for companies to operate internationally, because employees and customer can access same file from any location.