Learn Docker from Scratch
Hello! Welcome
Today we will discover Docker, a tool that makes working with applications easier.
What is Docker?
Docker is a container platform that allows you to package applications and their dependencies in an isolated environment called a container.
Containers ensure that your application works the same regardless of the environment, making it ideal for developers!
Why use Docker?
Docker simplifies application management by isolating them in containers.
This way, each application has everything it needs to function correctly, without interfering with others.
Installing Docker
To get started, we need to install Docker. Docker can be installed on Windows, Mac, and Linux.
Visit the official Docker page and follow the instructions for your operating system
Docker has a free tier and a paid tier. For home use, it is free.
You’re doing great!
Now let’s talk about how to work with containers
Containers in Docker
A container is a running instance that includes the application and all its dependencies.
Containers are like “mini-computers” that you can easily configure, run, and remove.
Each container is independent, so you can run multiple without issues.
Docker Images
Docker images are the templates from which we create containers.
An image defines the software and configurations that the container will have. You can save and share these images with others.
You can use official images or create your own custom ones.
Docker Hub
Docker Hub is an online repository where you can find Docker images for databases, servers, and development tools—there’s everything!
Docker Hub is an excellent resource for finding ready-to-use images.
Creating a Container
To create a container, you simply need to run a command in Docker.
docker run -it ubuntuDocker will download the necessary image (if needed) and prepare the container for you.
You’re almost there!
We just need to see how to create and configure images
Dockerfile
A Dockerfile is a text file that contains instructions to create a custom image.
FROM ubuntu
RUN apt-get updateYou can define the operating system, dependencies, and configuration of your application.
Docker Compose
Docker Compose is a tool for managing multiple containers at once.
version: '3'
services:
web:
image: nginx It is useful for large applications that need multiple containers to function properly.
Networks and Volumes
Docker also allows your applications to communicate and store data.
- Network: allows you to connect your containers to each other or to the internet.
- Volumes: persistently store container data.
Well done!
Now you know the basics of Docker! You can continue exploring and learning!
