Sometimes we get the requirement to change the key-pair of AWS EC2 instances for some security reasons. In this article, we will be changing the key pair of running EC2 instances using the Ansible Playbook. General Information When you use standard AMIs to launch an EC2 instance, you can connect to it…

I’ve created a blog post that demonstrates how to set up Rancher and integrate an existing AWS EKS cluster into it. Rancher is an open-source software platform that is used for managing the Kubernetes clusters. Prerequisites AWS EC2 Instance — Ubuntu EKS cluster with kubectl access Step 1: Install Docker on EC2 instance (Rancher Server) I used to follow the…

In this guide, we’ll set up the Kubernetes-maintained Nginx Ingress Controller, and create some Ingress Resources to route traffic to several dummy backend applications. Once we’ve set up the Ingress, we’ll install cert-manager into our cluster to manage and provision TLS certificates for encrypting HTTP traffic to the Ingress. …

In this blog, we will deploy a PHP application on a Kubernetes cluster with Nginx and PHP-FPM running in separate containers. We want the web-server Nginx and PHP-FPM to be co-located in separate pods. PHP-FPM PHP-FPM is an implementation of Fast-CGI for PHP with improved capabilities around process management, logging…

Here is an example of a simple web application that has an in-memory cache such as Redis Redis deployment with 4 replicas in a three-node Kubernetes cluster that uses pod affinity. We want the web servers to be co-located with the cache as much as possible. If we create the…

Liveness and Readiness probes are used to control the health of an application running inside a Pod’s container. Kubernetes gives you two types of health checks, and it is important to understand the differences between the two and their uses. Liveness probe Liveness probes let Kubernetes know if your app is alive…

This is a DevOps CI/CD pipeline using Git, Jenkins, Ansible, and Docker on AWS for deploying a python-flask application in a Docker container. — The process should be initiated from a commit to a specific branch of a GitHub repository(often master). This event kicks off a process that begins building the Docker image. Jenkins supports this event-driven flow using the “GitHub hook trigger”. Project Architecture

The goal of this example is to show you how to get a Python-Flask application into a Docker container. The guide is intended for development, and not for production deployment. The guide assumes you have a basic understanding of how a Python application is structured. …

Using the lambda function with python code, we will be able to shut down the EC2-instances automatically. The python code that can be executed automatically using the AWS cloudwatch rules has been provided below. General Information To save costs on AWS EC2, it may be necessary in some cases to automatically shut…