Docker Webinar #1

It has been a week from hell and it is only Thursday afternoon. Allow me to elaborate. On a previous post, I mentioned the events regarding a water leak in my office. That occurred last Monday and Tuesday. At this point I only have to call to return a fan and ask for reimbursement on four books that got damaged by water.

On Wednesday I stopped by the car dealer to get an oil service for my vehicle. It has a lithe over 4,000 miles. I do not drive too much since I work from home. On my way back on 494 E I exited on the ramp to get to 77S (Cedar Avenue). As I merged into Cedar I started accelerating and moving to the center lane (Cedar at that point has three lanes plus a fourth one to enter and exit). As I was reaching the bridge for Old Shakopee Road, my two right tires popped as I hit a set of potholes covered in water. It was raining and quite foggy. After stopping on the bridge over the Minnesota River, I decided drive to a nearby gas station to see if I could put some air in my tires. Lucky I have run flat tires, otherwise I would have had to call a tow. When I tried putting air, I noticed that both tires had openings of about 5 to 6 inches. The only solution was to get them replaced. After talking with my son, he suggested the closest shop which would offer a rental while they replaced the tires. Shortly before 05:00 PM I received a call that the vehicle was ready and headed out to pick it up. Continue reading “Docker Webinar #1”

RabbitMQ – Work Queues

In this post we will experiment with a work queue using the RabbitMQ middleware software on a Windows 10 machine. After we cover the basics, we will integrate RabbitMQ with Docker and a group of microservices. It is extremely important to read and experiment until all the concepts are clearly understood.

With that said, let’s talk about work queues. In this example we will create a Work Queue that will be used to distribute time-consuming tasks among multiple workers. I have been experimenting with one, two and three worker threads. Continue reading “RabbitMQ – Work Queues”

RabbitMQ – Hello World

Good morning. In this post we will explore RabbitMQ by Pivotal. RabbitMQ is a message broker. Message brokers are considered middleware. Applications subscribe to a queue to send and receive messages. Another queue broker I have used in products is MSMQ from Microsoft. In this post we will only experiment with RabbitMQ. You may decide to use message queues to communicate between microservices. Continue reading “RabbitMQ – Hello World”

Checking Docker Installation on Linux

I am starting some work using Docker containers and as usual I like to spend some time refreshing and checking all is well before starting the actual development. Such approach seems to allow me to catch up issues before they cause bugs during the software development cycle.

Last year I wrote a post with the instructions I followed while installing Docker on my CentOS 7 Linux machine. If you are about to install Docker, their website appears to have up to data instructions for different operating systems. Continue reading “Checking Docker Installation on Linux”

Partial Retrieve from Encrypted Store

In a previous post we covered the retrieval of data from a store. It was described that the data at rest and in transit were not encrypted. The reason was that the store was deployed in facilities behind the firewall. Access from the outside was not allowed.

As time changed, data was only encrypted in transit using secure sockets or HTTPS. Given that facilities had to allow remote access, it made sense to encrypt the data at rest. When a client application would request data, the storage server would decrypt the file and send it to the requesting client via a secure protocol. Continue reading “Partial Retrieve from Encrypted Store”

Encrypted Store

This post has to do with encrypting data in a storage server. When the storage server in question was architected and implemented the data at rest and in transit were raw (unencrypted). The main reason was that clients and servers where deployed in the same facility.

Years when by and the requirements called for encrypting data in transit while the data at rest was left raw. Encrypting data in transit could be performed by using HTTPS, secure sockets or encrypting the data when retrieved from the servers and decrypting by clients when received. Storing data would be the opposite. The initial decision, given that the client and server where under control, was to encrypt transmissions using the Advanced Encryption Standard (AES) which was designed by Vincent Rijmen and Joan Daemen back in 1998. Continue reading “Encrypted Store”

Neo4j and Dijkstra’s SSSP

The workday is starting to wind down slowly. I have been doing some cosmetic changes and running tests on a medical storage server. No matter what you change you must always run tests to make sure all is well.

On my last post I covered Dijkstra’s algorithm for shortest path. Shortest path implies distance and not number of vertices traversed.

Continue reading “Neo4j and Dijkstra’s SSSP”

Issues while Installing Hadoop on Windows

I am always trying to read and practice with topics / subjects that I feel learning or call my attention. I am currently taking some specialization courses on Coursera. You can never give up and stop learning. In this post I will describe how I installed Hadoop and the issues I encountered. Continue reading “Issues while Installing Hadoop on Windows”

Castor Framework

My wife and I are going to attend a wedding on July 5th. I am going to wear black dress shoes. A week or so ago while at Nordstrom’s at the MOA I was going to get a pair of shoes for the occasion. My wife mentioned that I have a pair of never worn black shoes still in their box. This morning, my wife gave me the shoes. I decided to wear them at home for a few days in order to make them mold to my feet. Seems like most of the times I wear new shoes I get blisters on my feet. I am the type of person that wears thick socks even when wearing sandals. Will see how things went after the wedding. Continue reading “Castor Framework”


Kubernetes, it appears to me to be a funny sounding word that could be uttered by an actor in a science fiction movie. If interested in the actual origin of the word, take a look at the following Kubernetes link in Wikipedia.

I am more interested in what it does than how the word came to be (even though I did read the entire Wikipedia article). In the book Production-Ready Microservices by Susan J. Fowler; published by O’Reilly (which I purchased from Amazon and read), a nice and simple diagram is used to describe the four-layer model of the microservice ecosystem. Continue reading “Kubernetes”