Exploring DNS the phonebook of the internet — Banner graphic by Vectorjuice on Freepik What is DNS? Domain Name System (DNS) is a hierarchical distributed naming system for devices on the internet. It is used for translating domain names to IP Addresses. DNS is like a phonebook for devices on the internet. A phonebook is used to map a name (contact)…

Learn the dark arts of understanding regular expressions — Regex (also called Regular Expression or RegExp) is a sequence of characters that can be used to find or match patterns in text. Regexes are made up of special characters (meta-characters) that allow to define complex patterns in a terse and concise manner. Regexes has a broad range of real…

An introduction to the directories that makeup the Linux Filesystem — All devices generate data in some shape or form. The generated can have different structures, sizes and even different level of sensitivity. To store data permanently computers make use of nonvolatile storage devices like Hard Disk Drives (HDD), Solid State Drives (SSD) and USB Sticks. Once the data is written…

Docker containers are used to run applications and services in an isolated environment. Any data that is generated by the container only stored while the container is running i.e. data generated by the containers is ephemeral in nature. This becomes can issue if we want to persist information even after…

In this post we will be looking at Docker Networks with its types and how to use them. The reader is expected to have a high level understanding of Docker and Computer Networks before going through this post. Docker network helps to facilitate communication between containers and other non-containerized services…

So far, we have looked at the basics related to containers and the various Docker commands for managing Images. In this article, we are going a dive deeper and look at Containers (finally) and their associated commands. Container Lifecycle There are 5 states in which a container can exist during its entire…

In the previous article, we looked at some of the basic concepts related to containers and how containers differ from VMs. In this article, we will look at Container Registries, Docker Images, and the main commands related to images. To follow along, Docker Engine needs to be installed on our…

In this post we will be looking at some basics concepts that are important in understanding Docker and have an discussion along the way on how Virtual Machines differ from Containers. What does to mean to Containerize software and What is a Container ? The process of packaging software along with all of its components is called as containerization. Components can be anything…

File permissions is an important concept to understand for anyone working with Linux. Permissions are a set of attributes (along with ownership) which is used to control the level of access the users and system processes have on files. It is a security mechanism which ensures that only authorized users…