What Are the Different Acronym Stacks in I.T.?

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Question
What are the different acronym stacks in I.T.?

Answer
There are many open source combinations of technologies that are in wide use.  These acronyms referred to as “full stacks” or “stacks” appear in articles and job descriptions.  A full stack is a bundle of software that (includes an OS and) can create a complete and functional product when properly configured. 

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How Do You Get PowerShell’s Invoke-Webrequest to Work Consistently (Instead of “command not found”)?

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Problem scenario
You use invoke-webrequest and it works fine with some websites. But sometimes you find that PowerShell says “command not found.”  What is wrong?

Solution
invoke-webrequest will work to download html and htm files.  Depending on the source file on the web server, the command needs a flag to work properly.  For an image file with a .jpeg extension, the invoke-webrequest needs a flag “-ContentType ‘image/jpg'” or something similar to work. 

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How Do You Install node and npm on Any Distribution of Linux Server?

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Updated on 5/1/20

Problem scenario
You have a Linux server with 1 GB of RAM.  You want to install node and npm because you want to try out the latest JavaScript technologies.  (You were persuaded to not use Gulp or Grunt to manage build scripts.  You want to use npm because of this link.)  You want to use the same copy of the bash script on CentOS/RedHat/Fedora,

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How Do You Get an Apache Web Server to Publish a Specific .PHP File on a CentOS/RHEL/Fedora Server?

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Problem scenario
You are using a RedHat derivative distribution of Linux.  You want to install Apache Web Server on it so it can publish PHP content.  How do you install and configure the necessary dependencies to do this?

Solution
1.  Install Apache web server:  sudo yum -y install httpd

2.  Install PHP:  sudo yum -y install php

3. 

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How Do You Use PHP Variables in HTML?

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Problem scenario
You have a .php file with PHP and HTML code.  You want an HTML text field to be display a pre-populated text value by default.  The user can then modify this value from the web UI (i.e., front-end).  You want this text value to be based on a PHP variable (calculated in earlier in the code).  How do you get your HTML code to display the value of a PHP variable?

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How Do You Use Flask as a RESTful Endpoint on an Ubuntu Server?

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Problem scenario
You want to deploy Flask to test it out.  You also want a RESTful endpoint on an Ubuntu Linux server.  How do you do this?

Solution
1.  Install Flask.  Run these five commands:

sudo apt-get -y update
sudo apt-get -y install python python-pip 
sudo pip install –upgrade pip setuptools
sudo apt-get -y install python3-dev virtualenv python3-venv
pip install flask

2. 

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How Do You Use TLS with Nginx?

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Problem scenario
You know how to use TLS with Node.js because of this article.  You want to use TLS with Nginx to test it out with a regular web browsing session.  You want to implement TLS without Node.js.  How do you set up TLS (without paying a certificate authority and without Node.js)?

Solution
This assumes that port 443 is not blocked from the workstation to the Nginx server.

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How Do You Troubleshoot “curl: (52) Empty reply from server”?

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Problem scenario
You are running a curl command.  But you get this error “curl: (52) Empty reply from server.”  What is the problem?

Possible solution #1
You are using curl with a port assignment in the URL (e.g., http://coolname.com:5077).  Try a different port.

Possible solution #2  (This solution is only relevant if the URL endpoint is supported by a Docker container.)
The docker-compose.yml file could be configured incorrectly.  It may refer to files with incorrect paths.  You may need to change the docker-compose.yml file to refer to correct paths.  An alternative solution would be to create the necessary files that the docker-compose.yml file needs and the related subdirectories that the file is looking for.  Your “docker-compose up” command may work with no errors.  But the references to the URL path may produce the “Empty reply from server” if the docker-compose.yml file refers to directory paths (e.g., for nginx listening on a specific port) in subdirectories that do not exist.

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How Do You Monitor a Server Being up with AWS or How Do You Use AWS Route 53 without a Domain Name?

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Problem scenarios
One, or both, of the following apply to your situation:

Problem scenario #1
How do you use AWS (the SNS component) to set up an email alert to be notified of a server going down?

Problem scenario #2
You want to use Amazon Route 53 to see how this component works.  You do not want to register a domain name. 

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