Blogger Sandbox

In our previous blog posts we ran containers with the Fedora and CentOS images.  In this blog we are going to run a command to see which containers are running in our host system.  To get a list of all the containers running on our host Ubuntu system we type in the command docker ps -a command.

The beauty of Docker is that you can run a very lightweight image of another Linux distro on your host system.  In this post we will be pulling the latest image of CentOS into our docker container on our Ubuntu server. Step-by-Step: 1. Open the terminal in Ubuntu, then make sure docker is running by typing service docker status, you should see something a message like the image below

The beauty of Docker is that you can run a very lightweight image of another Linux distro on your host system.  In this post we will be pulling the latest image of Fedora into our docker container on our Ubuntu server. Step-by-Step: 1. Open the terminal in Ubuntu, then make sure docker is running by typing service docker status, you should see something a message like the image below

One of the most common task you have to do as a Linux administrator is to add a new user.  Especially developers who always wants root access. Docker needs root access, however the person who is administering Docker is probably not the system administrator.  Most likely it will be the application developer. To accomplish this task you can use the useradd command in the Terminal session then add the new user to the Docker group.  Follow the steps below to add a new user to Ubuntu. 1.  Switch into the root user using  sudo su -  command

In ASP.NET MVC there is a default layout file that the application use when one exists.  If you look at the markup at the top of the "Index.cshtml" file you will see that there is a markup to specify the layout of the page in the code below. @{ Layout = null; } The code above tells ASP.NET MVC to not assign any layout to the page because it is being set to null. In this blog we will build on our existing NorthwindCafe.Web    project and add a default layout view to the project so that each page in the project will have a common layout.  This is similar what you would a master page for in web forms.

In the previous post we installed Docker on our Ubuntu server.  Now we are going to add the Docker repository to our local server so that we can get the latest version of Docker. Step-By-Step Instructions: Open the terminal command line tool and switch to root user with the sudo su command 2. Now we have to add the Docker repo key to our local machine by typing the following command wget -qO- https://get.docker.com/gpg | apt-key add - 3. The next command is to add the Docker repository to the Ubuntu repository source list.  Type the following command into the terminal: echo deb http://get.docker.com/ubuntu docker main > /etc/apt/sources.list.d/docker.list 4.  Now type apt-get update to get the latest updates from the Docker repository.  If you haven't ran update for a while.  This might take a while. 5.  After the update has completed type docker -v to the version number

Docker is the hottest infrastructure technology to hit the tech world in a long time.  The appeal of Docker is that it allows the infrastructure team to utilize the capacity of the servers to near full capacity.  Docker is a container.  A container is like a micro virtualization minus the operating system.  It only contains enough infrastructure to host an app, without the fat.  Hence the term container is used to describe it. Here are the steps to install Docker on a CentOS Server: 1.  Open the CentOS terminal, then type the following command to switch to the super user:       sudo su 2.  Now get the latest update for CentOS by typing yum update 3.  To install Docker type the following command in the terminal     yum install -y docker 4.  Once the installation is complete type following command to start the docker service       systemctl start docker.service , then type systemctl status docker.service to see the current status      of our docker container.  You should see the message

Docker is the hottest infrastructure technology to hit the tech world in a long time.  The appeal of Docker is that it allows the infrastructure team to utilize the capacity of the servers to near full capacity.  Docker is a container.  A container is like a micro virtualization minus the operating system.  It only contains enough infrastructure to host an app, without the fat.  Hence the term container is used to describe it. Here are the steps to install Docker on a Ubuntu Server: 1.  Open the Ubuntu terminal, then type the following command to switch to the super user:       sudo su 2.  Now get the latest update for Ubuntu by typing apt-get update 3.  To install Docker type the following command in the terminal      apt-get install -y docker.io 4.  Once the installation is complete type service docker status Now we have Docker installed and running on Ubuntu.  It was pretty simple wasn't it?

In the previous post we have enabled MVC on our application.  Now we want to add our first MVC controller and view to test out verify that MVC is working.  We also have to tell ASP.NET Core what pattern to look for when looking for our controllers and views. Step-By-Step Instructions: 1.  Add a folder call "Controllers" in the root of your application 2. Right click on the "Controllers" folder and select "Add" → "New Item" → .NET Core → MVC Contoller Class, then click "Add" 3.  You see the "HomeController.cs" class being added to the "Controllers" folder 4.  Double click on the "HomeController.cs" file and you will see the following code using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; using Microsoft.AspNetCore.Mvc; namespace NorthwindCafe.Web.Controllers { public class HomeController : Controller { // GET: / / public IActionResult Ind

In this post we will go over the process of enabling ASP.NET MVC in our application.  Just like static files, in order for us to use MVC in our application we have to tell ASP.NET Core to use in the Startup.cs file.  We will continue to use the application "NorthwindCafe" that we used in our previous blog. Here are the steps to add MVC to your application: 1.  Open the Startup.cs file, then in "ConfigureServices" method type in the following to enable MVC public void ConfigureServices(IServiceCollection services) { services.AddMvc(); } 2. As with the static files, there will be a red underline on the .AddMvc() method that's because we haven't added the package to your project yet.  So click on the yellow light and select the first option to add Microsoft.AspNET.Mvc package to our project. 3.  Now go into the Configure method and type app.UseMvc() into the method, the final markup should look like the following publ

As I have mentioned before ASP.NET Core decouples the application from the infrastructure as much as possible.  Therefore, you have to tell it exactly what you want in your project.  In this blog post we are going to tell ASP.NET that we want to serve static html files in our application. Here are the steps to serve static files in our ASP.NET Core application. 1.  Open the "NorthwindCafe.Web" project, then click on the "Startup.cs" file in the project.  You will see the following markup in the Configure method public void Configure(IApplicationBuilder app) { app.Run(async (context) => { await context.Response.WriteAsync("Hello World!"); }); } 2.  Go into the Configure method, remove the existing code and type in the following code public void Configure(IApplicationBuilder app) { app.UseStaticFiles() } You will notice that the app.UseStaticFil

In this blog post we are going to add the jQuery, AngularJS, and bootstrap libraries to our ASP.NET Core application.  Normally we will use NuGet to bring in these libraries but ASP.NET Core gives you the option to use bower to configure the dependencies that you will need on the client-side. Here are the steps to import the client-side dependencies into our project: 1. First let's make bower.json part of the "NorthwindCafe.Web" project, by right click on the bower.json file, and then choose "Show in Solution Explorer" 2.  Open the bower.json file the markup should look like this { "name": "asp.net", "private": true, "dependencies": { } } 3. Change the markup to look like the following { "name": "asp.net", "private": true, "dependencies": { "bootstrap": "~3.3.6", "angular": "~1.5.7" } } 4. Save the bower.js

Technology has moved at a breakneck speed, after working with ASP.NET Core for a while, I realized that my ASP.NET MVC blog articles have become outdated.  Don't get me wrong, MVC is still a very big part of ASP.NET Core, but that's the thing it's just a part of it.  ASP.NET Core has decoupled the infrastructure from the application.  You can deploy your web app on Docker imagine that!  No longer is IIS your primary means of hosting your ASP.NET application. However, with this new freedom comes added complexity.  No longer can you just drag and drop components into your design surface.  Those days are long gone.  This post ist meant to ease your way into ASP.NET Core.  I will using the release candidate version two of ASP.NET Core for this post and other subsequent posts.  Don't be surprise if I update the version midstream because the product is still pre-release.  I will be using Visual Studio 2015 for my development.  You can use the command line interface and notepa

In the previous blog we got Angular-Seed to work with a module and a controller.  However, we put everything in the global scope.  The problem with that is that there are many JavaScript libraries that might be using the same variables as we are, or if we are working with other developers.  The way we can mitigate this problem is to wrap our modules and controllers in an anonymous function.  Think of an anonymous function as a wrapper or a container to hold our modules and controllers.  Another term developers like to refer to anonymous function is an IIFE.  Whatever it's called it's always good practice to avoid putting things in the global environment if it can be avoided. Here are the steps to take the modules and controllers out of the global environment: 1.  First let's wrap the module in an anonymous function.  The source code for the app.js file should look like the following (function(){ 'use strict'; var app = angular.module('shoppingList',

The previous blog we setup the Angular-Seed boilerplate template for our SPA application.  In this blog we are going to prepare the Angular-Seed template for our SPA application which is going to be a simple shopping list application.  The steps below describes the steps to clean up some of the pages in the angular-seed template for our application. 1.  Delete the content of the "index.html" page in the angular-seed main folder.   It is located in the main folder of the angular-seed template "/angular-seed 2.  The source code file "index.html" should look like the following <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Shopping List App</title> <link rel="stylesheet" type="text/css" href="app.css"> </head> <body> <script type="text/javascript" src="js/lib/angular.js"></script> <script type="t

Bower is a JavaScript tool to get client dependencies in your project using npm packages. The requirement for bower is that you need to install Node.js first.  You can follow along in the this  blog  to install node.js, After node.js is installed open the command line and type the following command npm install -g bower The command above will install bower in your system globally.  Now we can use bower install packages individually, but the convenience of bower is in the bower.json file.  With the bower.json file we can specify all the dependencies that our project will need in one configuration file. Here are the steps: 1.  Create a folder call "AngularShoppingApp" 2.  Create a file call bower.json in your favorite text editor 3.  The content of the bower.json file should look like this { "name": "ShoppingApp", "private": true, "dependencies": { "angularjs": "~1.5.7", "bootstrap": "~3.3.

The MAX() function gets the highest value in the specified column, and the MIN() function gets the lowest value in the specified column SELECT MAX(UnitPrice) AS HighestPrice, MIN(UnitPrice) AS LowestPrice FROM Products The query above gets the highest and lowest prices for the Products table in the Northwind database  

"Bootstrap is the most popular HTML, CSS, and JS Framework for developing responsive, mobile first projects on the web."  - getbootstrap.com Brief Introduction: Bootstrap is a front-end framework using HTML, CSS and JavaScript to build menus, navigations, layouts, forms, tables, and etc.  What is special about Bootstrap is that mobile-first, and responsive design is it's default behavior.  Okay, hold on, let me put my professor's glasses on! Okay class here goes: Mobile-First Design :  You design your site for mobile devices first so the desktop version is second class citizen. Responsive Design: A design that makes your site look good on all screen sizes, and does not need to degrade gracefully.  Meaning you can resize, stretch, maximize, do yoga with your site and it will still look good.  Well up to a certain threshold. So to setup Bootstrap, you will do the following: 1. Create an HTML5 page <!DOCTYPE html> <html lang="en"> <head>

Git is an open sourced version control system, that a lot of open source projects have a repository on. To install Git on Windows follow the directions in this blog. 1.  Go to http://www.git-scm.com 2.  Click on "Download for Windows" if you are using Windows, or "Downloads" if you are using other OS.  After you click on the button, save the download to a location on your desktop. 3.  Double click on the Git, .exe file that you've just downloaded 4.  Click "Next" on the welcome screen 5.  Click "Next" to accept the license screen 6.  Click "Next" to accept the path, or use the "Browse" button to choose a different path. 7.  Select the following components and then click "Next" 8.  Click "Next" to accept the "Start Menu Folder" name  9.  Select "Use Git from Windows Command Prompt", then click "Next" 10.  The program will install automatically, wait for it to finish 11.  Cli