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Prerequisites Supported CentOS Versions Docker is compatible with the following CentOS releases: CentOS 7 (64-bit) CentOS 6.5 (64-bit) or later versions System Requirements Docker requires specific kernel versions depending on your CentOS version: CentOS 7: 64-bit system with kernel version 3.10 or higher CentOS 6.5 or later: 64-bit system w ...

Introduction to Docker Compose Docker Compose is a tool designed for defining and running multi-container Docker applications. It uses YAML configuration files to specify services, making it suitable for various environments including production, staging, development, testing, and CI workflows. Building a Simple Application This example demonst ...

Docker Overview Docker is an open-source containerization platform that enables developers to package applications along with their dependencies into lightweight, portable containers, which can then be deployed across Linux environments. Installation Procedure Step 1: Remove Legacy Docker Versions Ubuntu may ship with older Docker packages that ...

Creating a Docker container for Nginx involves defining the container configuration and building an image. Begin by creating a Dockerfile in a new directory with the following instructions: FROM nginx:alpine # Optional: Replace default configuration with custom file COPY nginx.conf /etc/nginx/nginx.conf # Optional: Add static content to defau ...

Building a Multi-Node Docker Swarm 1. Environment Setup Server Name IP Address Role controller 10.32.161.124 Manager worker1 10.32.161.125 Worker worker2 10.32.161.126 Worker 2. Docker CE Installation Install Docker CE on ...

Having established a base CentOS 7 image, the next step is to construct middleware images. This example demonstrates building a Docker image that integrates Nginx and PHP-FPM. The project structure is as follows: docker-training/ ├── centos7/ ├── mysql/ ├── php-fpm/ │ ├── Dockerfile │ ├── nginx_default.conf │ ├── nginx_nginx.conf │ ├── ...

Docker Installation on Ubuntu This guide covers two methods for installing Docker Engine on Ubuntu systems: the automated script approach and the manual repository configuration. Method 1: Automated Installation Script The fastest way to install Docker is using the official convenience script with a mirror for better download speeds: curl -fsSL ...

Architectural Overview In conatinerization, an image functions as an immutable blueprint, analogous to a compiled class definition in object-oriented languaegs. A container represents an active, isolated runtime instance derived from that blueprint. Grasping this relationship is essential for orchestrating reproducible application environments. ...

Chart Structure and Configuration A Helm chart is a collection of files that describe a related set of Kubernetes resources. The core components include Chart.yaml, values.yaml, and template files under the templates/ directory. Chart.yaml This file defines metadata about the chart: apiVersion: v1 name: k8sapp version: 0.1.1 appVersion: "1 ...

Kubectl Deploymant Workflow The process for deploying applications using Kubectl involves several key steps: Verify cluster readiness (Minikube or kubeadm) Create Deployment configuration Apply the configuration Verify deployment status Deploying a Sample Web Application 1. Creating the Deployment Configuration A Deployment object manages app ...