How to setup RAID 1 on LINUX Server

Posted on September 15, 2017 by codehotfix

RAID 1 consists of an exact copy of a set of data on two or more disks; a classic RAID 1 mirrored pair contains two disks. This configuration offers no parity, striping, or spanning of disk space across multiple disks, since the data is mirrored on all disks belonging to the array, and the array can only be as big as the smallest member disk. This layout is useful when read performance or reliability is more important than write performance or the resulting data storage capacity.

How to setup RAID 1 on LINUX

This article contains steps which give you the glance about “How to setup RAID 1 on your Linux server”. Things you will need:

More than one hard disk installed on your system.
Basic knowledge of Linux filesystem in case you come across any errors.

So here is the step by step guide to setup RAID 1 on your system/server:

First, check the hard disks attached to the system using the command fdisk –l.

Here is what the output should look like.

Create a RAID 1 partition: Type mdadm –create /dev/md1 –level=1 –raid-devices=2 /dev/sdg /dev/sdh.

NOTE: replace “sdg” and “sdh” with the names of the hard disk on your server that you want to add in RAID.

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Linux – Change the password of any Ubuntu user account including root

Posted on September 10, 2017September 11, 2017 by codehotfix

Have you forgotten your administrator password or the password of any user account on your Linux installation? Well, worry not, because we are going to show you how to change it without needing a live installation of Linux.

Things you will need:

Know your way around a Linux terminal.

You can change the password of any user account in these easy steps:

Enter recovery mode: To enter recovery mode press and hold down the shift key as the computer starts to boot.
This is what recovery mode looks like:
Select the one that says (recovery mode) from the list.
Now you will see a recovery menu on your screen, Scroll down that list and select the option that says “root”.
Now the filesystem is in read only state, you have to remount it to get write permissions, to do that type: mount –o rw, remount /
Now you can set any user’s password using this simple command: passwd USERNAME (replace USERNAME with the name of the account whose password you want to change)
After entering this command you will be asked to type and retype the password, once you have done that, your password will be changed.

That is all you need to do to change the password of any user account on your Linux installation.

Stay tuned for our next article…

Getting Started with Entity Framework Core

Posted on April 23, 2017September 11, 2017 by codehotfix

In this article, you will learn about the new lightweight version of entity framework that is entity framework core. If you have entity framework experience, you may be aware that EF core has been written from scratch to achieve some new goals. Here you will learn about similarities and differences from EF 6.

So What is Entity Framework ?

Entity framework is the set of .net APIs for performing data access in your software and entity framework is official data access tooling from Microsoft .

It originated from Microsoft research and then it was adopted from team who was responsible for ADO.Net as the next generation of Microsoft’s data access technology .

EF has gone through number of major revolution with most of new capabilities being added on top of what was built into the .net framework.With EF6 ,Entity framework was moved to codeplex and became open source and since then it moved to github and remains quite active.

Entity framework fits into a category of data access technologies called Object Relational Mappers (ORM). ORMs are designed to reduce the friction between how data is structured in relational database and how you define your classes ,without ORM we have to transform lot of code to transform database results into instance of our classes inn our software .

An ORM allows us to express our queries using our classes and then ORM builds and executes relevant SQL for us,but Entity framework is different from any ORM you might be familiar with.

While a typical ORM infers that the classes and database tables are of a similar structure,Entity framework has a mapping layer in between and gives us a lot more flexibility in to how to get from objects to table and from object properties to table columns and for these mapping entity framework does start with some assumptions and we refer to those as conventions but then you can apply additional mappings rules on top of conventions to be sure that in your specific scenario that the data is able to find its way back and forth between your objects and your database.

Why Entity Framework ??

Continue reading “Getting Started with Entity Framework Core” →

Firebase Complete Guide for Xamarin

Posted on March 15, 2017 by codehotfix

Firebase

Firebase is part of a growing trend known as “Back end as a service”. Traditionally configuration of a server would require you to fetch data via some API you have written in order to retrieve data from your server. When using SQL, you would have to write code that stores objects and properties that can be accessed in your code.

A cloud-hosted NoSQL database. Data is stored as JSON, synced across connected devices in milliseconds, and available when your app goes offline. Intuitive and easy-to-use API. Remains responsive regardless of network latency or Internet connectivity so apps works offline.

What is amazing about Firebase, is that essentially with one line of code, you are ready to begin writing to your database instantly. This gets stored as JSON (JavaScript Object Notation) and can be read and used in your application nearly as easily.

Firebase expedites the storing and retrieving of data via a third party service and comes with its own API so you don’t have to write one.

Continue reading “Firebase Complete Guide for Xamarin” →

Enabling SSL with IIS Express in Visual Studio Express

Posted on October 24, 2016 by codehotfix

Enabling SSL with IIS Express in Visual Studio 2015

Select the startup project and press F4 (the function key) this will open the property window.
To enable the SSL with in IIS Express, you have to just set “SSL Enabled = true” in the project properties.
Once you change the value, Visual Studio set in automatic the SSL URL, e.g., https://localhost:44301/.
Copy SSL URL. Go to the Advance properties by pressing Alt+Enter, select the Web tab and set the Project URL with the same value of SSL URL, e.g., https://localhost:44301/.
Now you have configured the default URL of the web application, we can run the site (F5 or CTRL + F5).PS: The first time you set the secure protocol on IIS Express, you will be prompted to install the certificate for SSL.

Note:

If you are getting “IIS Error: cannot add duplicate collection entry of type ‘mimeMap’ with unique key attribute ‘fileExtension’”

Please refer this .

Hope this will help !!

Store data in WCF Operation Context.Is ThreadStatic safe?

Posted on October 22, 2016October 22, 2016 by codehotfix

ASP Net MVC

WCF infrastructure allows you to store context sensitive data in InstanceContext of the service instance similarly like we do in HttpContext of MVC. For that you should implement from IExtension and plug that class into WCF’s infrastructure.

public class WcfOperationContext : IExtension<OperationContext>
{
    private readonly IDictionary<string, object> items;

    private WcfOperationContext()
    {
        items = new Dictionary<string, object>();
    }

    public IDictionary<string, object> Items
    {
        get { return items; }
    }

    public static WcfOperationContext Current
    {
        get
        {
            WcfOperationContext context = OperationContext.Current.Extensions.Find<WcfOperationContext>();
            if (context == null)
            {
                context = new WcfOperationContext();
                OperationContext.Current.Extensions.Add(context);
            }
            return context;
        }
    }

    public void Attach(OperationContext owner) { }
    public void Detach(OperationContext owner) { }
}

Which you could use like that:

WcfOperationContext.Current.Items["data"] = "My Data";
string user = WcfOperationContext.Current.Items["data"] as string;

 Continue reading "Store data in WCF Operation Context.Is ThreadStatic safe?" →

Basic Fundamentals of AngularJS

Posted on October 10, 2016October 21, 2016 by codehotfix

In this article we will understand the basic fundamentals of AngularJS.

What is AngularJS?

Angular is JavaScript library.
It is a MV* framework, where MV * means:

M- Model : where you store data and state of application.

V- View : which actually renders to user the information they want to see.

* : Controller /Presenter/View-model

Features of AngularJS

It is an open source library.
It is comprehensive which means it handles AJAX communication with your server so that you can send and receive data from back-end.This data is stored as plain JavaScript object.
It supports two way binding, which means that the user input from fields is instantly updated in angular models.
AngularJS also employees technique called Dirty Checking which means that you don’t have to put data in special structures and call getter and setter methods to read and write to your data . You can simply put data in plain old JavaScript object and Angular will respond whenever your data changes and update your view.
AngularJS is built on Dependency Injection.This lets you encapsulate pieces of your application better and also improves test ability.
AngularJS also handles routing for moving from one view to another .This is the key piece in building Single Page Application or SPA.
AngularJS not only supports unit test but also integrates end to end testing.

Directives :

AngularJS extends HTML by providing its own elements and properties called Directives.These are used to interact with your HTML DOM. It teaches your HTML new tricks.It is an extended HTML vocabulary.

Angular Components:

Everything starts with controller, it is a central player.

Continue reading “Basic Fundamentals of AngularJS” →

Basic Git Hub Usage Manual

Posted on April 11, 2016 by codehotfix

Git Hub Usage Manual

GitHub Account Creation And Setup Configuration:

Need to create an account on https://github.com with official email id. And also activate two factor authentication and set profile picture over there. Once done with these inform Jaco about it, so he can add you in the CeX organization account.
Now create the Personal Access Token from the Settings, it will be useful when we want to push the changes to the remote through Git Bash.
Download GitHub Desktop from https://desktop.github.com/ and Git from http://git-scm.com/download/ and install these two applications.
When you start GitHub desktop, you have to login over there. To login on GitHub Desktop goto Tools And Options and then in Options you will find the add account option.
For Git open Git Bash and run $ git config –global user.email “<EmailID>” command, this will configure your account in Git.

Continue reading “Basic Git Hub Usage Manual” →

How to Configure Samba Server on CentOs 7

Posted on March 31, 2016September 11, 2017 by codehotfix

Configure Samba Server on CentOs 7

This article will be a quick guide to show you guys how to setup a network share with Samba on CentOs 7 or any other similar Linux distribution like Red Hat.

Samba share allows sharing of files between the server and various different computers on the same network.

Note: The following commands will require super user privileges.

1. Install Samba: Although Samba should come preinstalled on Centos but you can install it or check if it’s installed using the command

sudo yum install samba

2. Start services smb and nmb:
sudo service smb start && sudo service nmb start

You can now check the status of these services by typing the command

sudo service smb status

If everything is fine you will get an output like this.

Continue reading “How to Configure Samba Server on CentOs 7” →

How to setup RAID 1 on LINUX Server

How to setup RAID 1 on LINUX

Like this:

Linux – Change the password of any Ubuntu user account including root

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Getting Started with Entity Framework Core

So What is Entity Framework ?

Why Entity Framework ??

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Firebase Complete Guide for Xamarin

Firebase

Like this:

Enabling SSL with IIS Express in Visual Studio Express

Enabling SSL with IIS Express in Visual Studio 2015

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Store data in WCF Operation Context.Is ThreadStatic safe?

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