Docker 101 - Intro to Container

Docker is a tool designed to make it easier to create, deploy, and run applications by using containers. Containers allow a developer to package up an application with all of its parts, such as libraries and other dependencies, and ship it as one package.

A Docker image is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools, system libraries, and settings. A Docker container is a runtime instance of a Docker image.

To run a Docker container, you use the command 'docker run'. You can specify various options such as the container name, ports to expose, and the base image to use. For example, 'docker run -d -p 80:80 nginx' runs an Nginx server detached in the background, mapping port 80 of the container to port 80 on the host.

Docker Compose is a tool for defining and running multi-container Docker applications. With Compose, you use a YAML file to configure your application's services, networks, and volumes. Then, with a single command, you create and start all the services defined in your configuration.

Docker containers and images can be shared via Docker Hub, which is a cloud-based registry service that allows you to link code repositories, build your images, and test them. You can push your Docker images to Docker Hub using 'docker push' command and pull them using 'doker pull', making it accessible to others.