Elasticsearch basic concepts and terminology

Data in Elasticsearch is organized into indices. Each index is made up of one or more shards. A shard is a low-level worker unit that holds just a slice of all the data in the index. Each shard is an instance of a Lucene index, which you can think of as a self-contained search engine that indexes and handles queries for […]

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Public Key Cryptography Basics

Encryption is the process of taking a message and scrambling its contents so that only certain people can look at your message. Symmetric Encryption Let’s take the example of Alice and Bob. Alice has a sensitive document that she wants to share with Bob. She uses an encryption program to […]

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Docker 103: Volumes

In the first part, we took a look at basics of Docker, building, stopping and removing them. This part will consist of mainly playing with changes and handling the concepts of volumes in docker. If we have to change few lines of code or “Hello World” to “Hello Div”, we […]

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docker namespaces

Docker 102: Internal Working

Docker internal working: One of the goals of modern software development is to keep applications on the same host or cluster isolated from one another so they don’t unduly interfere with each other’s operation or maintenance. One solution to this problem has been virtual machines, which keep applications on the same hardware […]

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docker concepts

Docker concepts: file, images, and containers

I’ve been asked these questions quite a few times and I am confused about how to explain it in layman’s term, but again if you can’t explain it to a 5 yr old, you don’t understand it yourself. Dockerfile: A Dockerfile is a text document that contains all the commands a user […]

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Docker 101: Basics

Docker is cool. I’ve just started to use and play it for small projects. This part will cover the basics of building and running docker containers and images. I started taking courses on Lynda.com which is given out free by my university and I went on a Binge Spree to […]

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Linux: File Descriptors, Streams and Pipes

File Descriptor: Linux file descriptors are non-negative integers that help in identifying an open file within a process while using input/output resources like network sockets or pipes. It can be considered as an index table of open files. A kernel creates an FD whenever it encounters an open call. each […]

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Linux: HA-Proxy vs Varnish: What, How and Where

HA-Proxy HAProxy, or High Availability Proxy is used for load balancing. Load-balancer servers are also known as front-end servers. Generally, their purpose is to direct users to available application servers. A load-balancer server may have only the load balancer application (HAProxy) installed or, in rare cases, it may be an […]

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linux shell

Linux: Shell Lifecycle

Before writing this, I wondered the same what goes on inside a shell lifecycle. It was explained to me in one of my system administration class but we certainly do not recollect everything in a graduate course. At work, I barely think before randomly typing a command, as to what […]

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