Learning About Docker Basics in Minutes

About Docker

Docker is a platform that helps developers to build, test, and deploy applications quickly. It uses OS-level virtualization to package software into standardized units called containers. These containers include everything the software needs to run, such as libraries, code, system tools, and runtime. Docker containers are portable and can be moved to different servers or environments.

Technical Terms

Images: Read-only templates that contain instructions for creating a container, including application code, libraries, tools, dependencies, and other files. Images are similar to snapshots in virtual machine (VM) environments.
Container: Containers are self-contained units of software that package code and all its dependencies together. These containers include everything the software needs to run, such as libraries, code, system tools, and runtime.

Real-time example MySql Install with Docker

Mysql

Docker images vs Docker containers

	Docker image	Docker container
What?	A reusable, shareable template for creating containers.	A self-contained, running instance of the software.
Created from	software code, dependencies, libraries, and instructions defined in a Dockerfile.	A Docker image.
Composition	Read-only layers.	Read-only layers with an additional read-write layer on top. (ex: setting up environment variables)
Mutability	Immutable. If there are changes, you have to build a new file.	Mutable; you can change it at runtime as required.
When to use	To store application configuration details as a template.	To run the application.

Docker CLI Command

Docker Hub

Login into Docker	docker login -u <username>
Publish an image to Docker Hub	docker push <username>/<image_name>
Search Hub for an image	docker search <image_name>
Pull an image from a Docker Hub	docker pull <image_name>

Docker Images

Build an Image from a Dockerfile	docker build -t <image_name>
Build an Image from a Dockerfile without the cache	docker build -t <image_name>. –no-cache
List local images	docker images
Delete an Image	docker rmi <image_name>
Remove all unused images	docker image prune

Docker Container

Create and run a container from an image with a custom name	docker run --name <container_name> <image_name>
Run a container with and publish a container’s port(s) to the host	docker run -p <host_port>:<container_port> <image_name>
Run a container in the background	docker run -d <image_name>
Start or stop an existing container	docker start\|stop <container_name> (or <container-id>)
Remove a stopped container	docker rm <container_name>
Open a shell inside a running container	docker exec -it <container_name> sh
Fetch and follow the logs of a container	docker logs -f <container_name>
To inspect a running container	docker inspect <container_name> (or <container_id>)
To list currently running containers	docker ps
List all docker containers (running and stopped)	docker ps –all
View resource usage stats	docker container stats

Finally

This article provides a foundational understanding of Docker, covering its core concepts and terminology. In the next article, we'll dive deeper into practical implementation by creating a Dockerfile, building an image from it, and running the container local.

Notes for Create an account in Docker Hub.

Create an account in Docker Hub (Docker Hub).
Create a repository and respective things as follows in the images attached.

Download Docker Desktop

Thanks.