Docker

Here’s a step-by-step tutorial for Dockerfile, including explanations and examples for each major command. Dockerfile Tutorial A Dockerfile is a text file containing instructions to build a Docker image. Each instruction creates a new layer in the image. Below are the most commonly used Dockerfile commands, their descriptions, and usage examples. 1. FROM Description:Specifies the…

Reference Rajesh KumarI’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I have worked at Cotocus. I share tech blog at DevOps School, travel stories at Holiday Landmark, stock market tips at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow , and SEO strategies at Wizbrand. Do you…

Docker Installation in Centos/RHEL Method -1: How to install Docker Community Edition via YUM? Step 1 – Install required packages. yum-utils provides the yum-config-manager utility, and device-mapper-persistent-data and lvm2 are required by the devicemapper storage driver. Step 2 – Use the following command to set up the stable repository Step 3 – Install the latest…

Below is a very detailed tutorial and lab manual for learning Docker Volumes, using the Ubuntu image for practical, hands-on labs. This covers all major types of Docker volumes, their use cases, and gives you example commands and exercises for each. You’ll understand: 1. Introduction to Docker Volumes Docker Volumes are the preferred way to…

Here’s an in-depth, step-by-step tutorial and lab manual for Docker Networking—starting from basics, covering all core concepts, and providing a hands-on guide to every feature and command. This guide uses the Ubuntu image for all labs and examples. Docker Networking Concepts & Lab Manual (Beginner to Advanced) 1. Docker Networking Concepts: Introduction 1.1 What is…

Here’s a practical Lab Guide/Tutorial for each Docker command you listed, with clear explanations and step-by-step examples using httpd (Apache) and ubuntu images.This is designed so a student can follow on their laptop and actually practice each command. Docker Command Lab Guide 1. cp — Copy files/folders between a container and the local filesystem What…

Part 1: How to Access the Docker Container Accessing containers is a fundamental skill. Whether you want to debug, update configuration, or inspect running services, you’ll need to “get inside” the container or reach its running applications. Scenario: You are running an Apache HTTP Server (httpd) in a Docker container. How do you access the…

In this guide, you’ll learn how to assign a static IP address to a Docker container using a custom bridge network. This IP address will remain fixed even after your host system reboots. ✅ Why You Need This By default, Docker assigns dynamic IPs to containers via its bridge network. If you restart your server…

When comparing Docker Desktop vs Rancher Desktop, especially in 2026 with Apple Silicon, open-source trends, and license changes in mind, it’s important to break down all key differences, similarities, and potential alternatives in a clear, structured way. ✅ Docker Desktop vs Rancher Desktop – Comprehensive Comparison (2026 Edition) Feature / Area Docker Desktop Rancher Desktop…

This updated guide explains how to implement a scalable, production-ready setup where each user gets a Docker container and unique subdomain like user123.wizbrand.com, without creating new Apache VirtualHosts for each. ✅ 1. Apache Configuration (Dynamic Reverse Proxy) Apache Modules (Enable Once) Apache Wildcard VirtualHost (Single File) Edit /opt/lampp/etc/extra/httpd-vhosts.conf or /etc/apache2/sites-available/000-default.conf: Restart Apache: ✅ 2. Laravel…

Docker Commands – First Commands Command Description info Display system-wide information version Show the Docker version information Docker Commands – Working with Containers Command Description attach Attach local standard input, output, and error streams to a running container cp Copy files/folders between a container and the local filesystem create Create a new container diff Inspect…

Here’s a complete tutorial on docker login, covering what it does, examples, and use cases. What is docker login? docker login is a Docker command used to authenticate to a Docker registry, such as Docker Hub, Amazon ECR, or private registries. Once authenticated, you can pull, push, and manage images from the registry. Key Features:…

Here’s a complete tutorial on docker volume, covering what it does, examples, and use cases. What is docker volume? docker volume is a Docker command used to manage volumes, which are Docker’s preferred method for persisting data generated or used by containers. Volumes provide a way to store data that is independent of the container’s…

Here’s a complete tutorial on docker network, covering what it does, examples, and use cases. What is docker network? docker network is a command used to manage Docker networks, enabling containers to communicate with each other and control how they connect internally and externally. Docker provides several types of networks (bridge, overlay, host, and macvlan),…

Here’s a complete tutorial on docker tag, covering what it does, examples, and use cases. What is docker tag? docker tag is a Docker command that creates a new tag (alias) for an existing Docker image. It does not create a new image but assigns a new name or version tag to an existing image…

Here’s a complete tutorial on docker save and docker load, covering what they do, examples, and use cases. What are docker save and docker load? Key Features: docker save Command Syntax Options: Examples of docker save 1. Save a Single Image to a Tarball This saves the my_image:latest to a tar file named my_image.tar. 2….

Here’s a complete tutorial on docker rmi, including what it does, examples, and use cases. What is docker rmi? docker rmi is a Docker command used to remove Docker images from the local system. It helps in cleaning up unused images and managing disk space. You can remove individual images, multiple images, or dangling images…

Here’s a complete tutorial on docker load, covering what it does, examples, and use cases. What is docker load? docker load is a Docker command used to load a Docker image from a tarball (image archive file) into the local Docker image repository. It is commonly used for importing images that were saved with the…

Here’s a complete tutorial on docker inspect, covering what it does, examples, and use cases. What is docker inspect? docker inspect is a Docker command that retrieves detailed information about Docker objects, such as containers, images, networks, and volumes. It returns the full JSON-formatted metadata, including configuration, network settings, resource usage, and more. Key Features:…

Here’s a complete tutorial on docker import, covering what it does, examples, and use cases. What is docker import? docker import is a Docker command that creates a new image from a tarball containing a container’s filesystem. It is often used to restore containers from exported tar files or to create custom images from minimal…

Here’s a complete tutorial on docker images, covering what it does, examples, and use cases. What is docker images? docker images is a Docker command that lists all available images on the local machine. It provides details like the repository name, tag, image ID, size, and the creation date of each image. Key Features: Basic…

Here’s a complete tutorial on docker history, covering what it does, examples, and use cases. What is docker history? docker history is a Docker command used to show the history of an image. It provides information about each layer in the image, including the creation time, size, command used, and author. Key Features: Basic Syntax…

Here’s a complete tutorial on docker export, covering what it does, examples, and use cases. What is docker export? docker export is a Docker command used to export the filesystem of a container as a tarball. This allows you to save the container’s data as a single file, which can then be imported or extracted…

Here’s a complete tutorial on docker commit, covering what it does, examples, and use cases. What is docker commit? docker commit is a Docker command used to create a new image from an existing container’s state. This allows you to save the current state of a container, including its file system and configuration, as a…

Here’s a complete tutorial on docker build, explaining what it does, examples, and use cases. What is docker build? docker build is a Docker command used to create a Docker image from a Dockerfile and context (the set of files required to build the image). Once the image is built, it can be used to…

Here’s a complete tutorial on docker events, explaining what it does, a complete list of examples, and use cases. What is docker events? docker events is a Docker command that provides a real-time stream of events happening on your Docker daemon. It tracks container lifecycle events (e.g., start, stop, create, kill), network changes, image pulls,…

Here’s a complete tutorial on docker top, covering what it does, examples, and use cases. What is docker top? docker top is a Docker command used to display the running processes inside a container. It shows information similar to the ps command in Linux, helping you monitor and troubleshoot the container’s processes in real time….