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Showing posts from May, 2022

Kubernetes and Docker Notes

What is Kubernetes ? Kubernetes (K8s) is a container orchestration tool, which helps to manage, deploy and scale containers like Docker etc. Kubernetes was designed by Google using Go Lang. What is Docker ? Docker is an open source project that automates the deployment of applications inside containers. What are Containers ? ⚡Containers are basically layer of Base image and application image, stacked together with all their necessary dependencies and configuration. ⚡Containers are portable and scalable.  Docker Public Repository : How to install Docker on Windows  ? Note : Hardware Virtualization should be enabled on the host box in order to install Docker.  1. Go to the link = 2. Download and Install the application To verify if installation was successful or not, just type :  docker run hello-world while running the above command I got the below error, it was because I didn't run Docker desktop app with

Powershell Tip : How to fetch public ip using Powershell Console

There are several ways to fetch your public ip like below : But today we are going to see the simplest way to fetch the same via Powershell console : Command : (Invoke-WebRequest -uri "").Content

How to check if SPF Record is valid or not ?

Before starting, lets understand what is SPF Record and its uses ? SPF Record is a Sender Policy Framework record. It is used by the mail servers to identify if the mails are coming from an authorized hosts or not. This helps to prevent spammers from sending mails using the Fake From address of your domain. Always avoid to keep multiple SPF Records for a domain. You can use the below domains to create or check if SPF Record is valid or not : 1. Create and check SPF record online ( 2. Free SPF Record Checker - Check SPF Record - SPF Record Lookup - DMARCLY 3. SPF Query Tool (