Hey folks, welcome back with a new chapter of Kubernetes for Beginners tutorial series. In the last article, we discussed Kubernetes config maps, and today we gonna discuss Kubernetes Secrets.

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When we develop applications, we keep our passwords and other sensitive data such as usernames, keys etc secured. Security is one of the main factors we need to consider when developing enterprise applications. Most of the time developers encode and save them. In the last article, we discussed how to move variables into a ConfigMap and store them. But the issue is these values are stored there in a plain text mode. This is definitely not the best method to store a password.

So, there come Kubernetes secrets. Secrets are used to store sensitive data. …


Hello all, welcome back to Kubernetes for Beginners tutorial series. So far we learned to deploy and expose Kubernetes pods and configure environmental variables to them. In this tutorial, we will discuss how to use configuration data in Kubernetes.

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In the last article, we discuss how to use environmental variables in Kubernetes definition files. Now, we will see how to use a separate configuration file to manage environmental data. ConfigMaps are used to store these environmental configuration data in Kubernetes. It is a file in the form of key value pair. After configuring the configMap, you need to inject it into the pod definition in Kubernetes. So, the configuration data in the configMap file will be available as environmental variables in the application hosted inside the container in the pod.

Below is a code snippet copied from the previous…


AWS is a trending cloud platform used in the industry. This series is for beginners to learn AWS from zero. Last article we discussed AWS messaging and queueing services. This article will discuss how to choose the perfect region for your AWS deployments.

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When running applications in your own data centers you need to have proper disaster recovery techniques. Having a duplicate second datacenter is one method for disaster recovery. But when working enterprise-level, maintaining a second datacenter cost a lot.

AWS provides a cost-effective solution for this issue. AWS has large datacenter groups named “Region”. An AWS region is build to be closest to the business traffic demand. Each region is connected with high-speed fiber networks controlled by AWS.

Every region is isolated from each other. In other terms, no data can go in or out from the datacenter unless granting permission for data to be moved. …


AWS is one of the biggest cloud computing platform providers. This tutorial series is for beginners to AWS. In the last article, we discussed how to create an AWS EC2 instance and access it with your local machine terminal. Today we will cover two messaging and queueing services provided by AWS — Amazon Simple Notification Service (Amazon SNS) & Amazon Simple Queue Service (Amazon SQS)

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Let’s start with an example. You have a system with two services as worker and master. The worker sends messages to the master. The system works fine. Suddenly the master becomes unavailable to receive the messages from the worker. So, when the worker sends messages it waits for the master to show up, but as it is not available the worker start dropping the messages.

This happens because the master and worker have a tightly coupled architecture. A tightly coupled architecture means whenever one of the services fails, the entire system breaks down.


Hey folks, welcome back with the third article of the AWS Basics tutorial series. In the last article, we discussed AWS EC2 service and types of pricing methods. In this article, we will be covering methods of accessing AWS Console.

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First, you go to the link https://aws.amazon.com/console/ and create an AWS account. If you already have an account you can log in to the console.


With the last article, we covered the introduction of AWS which included what is AWS, the benefits of using AWS, and how to use AWS. This article will discuss AWS EC2.

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What is AWS EC2?


This tutorial is on AWS basics, it helps you to get started.

In this tutorial, I will be covering;

  • What is AWS?
  • Why AWS?
  • How to use AWS?
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What is AWS?

Using on-premises servers, storage, machines including installing, maintaining, recovery managing. It costs too much. But when using a cloud service, the cloud service providers provide all the services need to deploy the applications. You can choose cloud services as per your need and pay only for what you use.

AWS is one of the biggest cloud service providers. It maintains internet-connected hardware, so you can provision and use what you want.

There are different methods of deployment methods.

  1. On-premises — Using all the local resources. …


DevFest Sri Lanka is an event organized by GDG team annually based on “by developers to developers”. It is a place where newbies and experts can gain knowledge with hands-on experience of their interest in Google products. But this year making a change, DevFest was hosted virtually for the first time with a brand new event #CloudKasthiram. This article will be talking about the experience with #CloudKasthiram 2020

Every year there were two sessions in DevFest as, workshop day and the session day. Usually, the workshop day consists of a few workshops including Google Cloud, Machine Learning and many other interesting topics. So, the participants could attend to what they really interest to.

But this year breaking the tradition, the event was hosted virtually for the very first time. DevFest Sri Lanka 2020 began on 16th October following a keynote and sessions on GCP, Knative, ML and more topics. At the end of the sessions, the ultimate #CloudKasthiram was announced.

Link for DevFest Sri Lanka 2020: GDG DevFest…


Hi guys, welcome back with the 07th article of the Kubernetes for Beginners tutorial series. In this article, we will see how to set environment variables in Kubernetes.

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In a Kubernetes pod definition, use env property to set the environmental variable. env property is an array. So, when you define the variable, use to separate variables.

env:
- name:
value:

The env property is a child property of the container property. That means the environment variables are defined under containers property. Each variable has a name and a value which are respectively going under name and value properties as mentioned in the above syntax.

Now let’s see how the final pod definition looks like.

apiVersion: v1
kind: Pod
metadata:
name: sample-pod
spec:
containers:
- name: ubuntu-container
image: ubuntu
env:
- name: JAVA_HOME
value…


Welcome back to “Kubernetes for Beginners” tutorial series. Kubernetes is a trending topic in the IT world. I am writing this series is for the beginners who as a help for their CKAD examination. If you haven’t checked my previous tutorials, I recommend you to have a look at them. Let’s start Part 06 of the tutorial series, Kubernetes commands.

Photo by Vlada Karpovich from Pexels
Photo by Vlada Karpovich from Pexels

Before starting I would like to recommend you to have a look at Docker in a nutshell if you are new to Docker. If not, you can continue this article.

In the previous Docker article (Docker in a nutshell), I showed you how to use commands and arguments in Docker commands. Now let’s check how to put commands and arguments into a pod-definition.yaml file.

Look at this docker command.

docker run ubuntu sleep 5

Let’s see how to put the sleep 5 command and argument to the pod definition file.

Step 01: Write the common structure of a pod-definition file

apiVersion:
kind:
metadata:
name:
labels:
app:
spec:
containers:
- name…

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