A Technical I.T./DevOps Blog
Problem scenario
You want to deploy your own LAMP stack with the power of Kubernetes. You do not want to rely on official Docker Hub images for the underlying Docker containers. How do you do this?
Solution
1. Deploy Kubernetes to AWS. If you need help to deploy Kubernetes to AWS, see this link. If you need assistance installing kubectl on any type of Linux (CentOS/RHEL/Fedora,
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Continue reading “How Do You Deploy a LAMP Stack Application Powered by Kubernetes?”
Problem scenario
Now that the Docker registry is set up and has been tested, you want the “docker login” command to be able to work from other Docker hosts. How do you configure another server (a Docker host, as a client) to work with a Docker registry server?
Solution
1. Install Docker on the server that will be the client. If you need directions,
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Continue reading “How Do You Configure a Docker Host to Be a Client of a Docker Registry?”
Problem scenario
You want to deploy a Kubernetes cluster to Azure. You have an Ubuntu Linux server (e.g., with a nano flavor in AWS, a server on-premises, or an one vCPU Azure server with one GB of RAM). It has no software packages installed on it (e.g., it does not have Docker or Kubernetes). How do you deploy Kubernetes into Azure (from an instance in AWS)?
Solution
Warning:
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Continue reading “How Do You Deploy a Kubernetes Cluster to Azure?”
Updated on 12/26/18
Problem scenario
I.T. security concerns itself with confidentiality, integrity and availability. These three categories are concepts which help professionals prioritize and crystallize what to secure and how to secure it.
In the context of computer security, the CIA triad (confidentiality, integrity and availability) is commonly used. How could data be available if it did not have integrity? What is the difference between integrity and availability?
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Continue reading “What Is the Difference between Integrity and Availability in the CIA Triad?”
Problem scenario
You are trying to create an organization using the chef-server-ctl org-create command. But you get an error that the “name” entered was invalid. For example, you run this:
sudo chef-server-ctl org-create ContInt “ContinualIntegration” –association_user contintuser –filename /bin/good.pem
But you get this:
ERROR: The data in your request was invalid
Response: Field ‘name’ invalid
What should you do?
Solution
For the “shortname” that is immediately after the “org-create” command,
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Question
Will current trends in DevOps and automation affect the role SDETs play?
Answer
If you want a definition of an SDET (and its etymology), see this posting. (As of 9/2/19, Wikipedia has no definition of the job title SDET.) If you Google the phrase “devops venn diagram” for images you will not see pictures of merely two overlapping circles with one circle representing “development” and another representing “operations.” You will see DevOps in the middle of an intersection of three circles — one of the circles is also QA!
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Continue reading “How Will Trends in DevOps and Automation Affect SDETs?”
Question
What is an SDET and where did the term originate?
Answer
The book How We Test Software at Microsoft says that the formal title for a software tester at Microsoft is “Software Development Engineer in Test, or SDET” (page 23). This SDET acronym (free of punctuation) was adopted in 2005 (page 24 of the above referenced book). Microsoft’s adoption of SDET gave this acronym recognition and serious meaning given the company’s leadership in the industry.
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Updated on 9/17/19 to support version 2 and version 3 of Python
Arguably the oldest video games was a variation of Tic-tac-toe. To read more about this, see this link. Many English-speaking countries outside the U.S. refer to the game as Noughts and Crosses (according to Wikipedia).
In the U.S., November 11th is the day America observes Veteran’s Day.
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Continue reading “How Do You Write a Tic-Tac-Toe Game in Python?”
Problem scenario
You have Linux servers that need Apache web server installed on them. How do you write a Chef recipe to deploy Apache web server?
Solution
Prerequisite
This solution requires that the Chef server must have access to GitHub. If you want to install Chef server, see this posting. If you want to install Chef client, see this posting.
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Continue reading “How Do You Write a Chef Recipe to Deploy a Apache Web Server to Linux Servers?”
Problem scenario
You try to run a knife command but you get 404 not found. What should you do?
Solution
Run this command: knife client list
If you get a 404 error with this command, then look at your client.rb file. Is the chef_server_url correct? Is the hostname actually the Chef server or is it something else? Is the “organizations/companynickname” present and correctly typed?
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Continue reading “How Do You Fix “404 not found” Errors When You Run Knife Commands?”